Jquery: how to trigger click event on pressing enter key

try out this....

$('#txtSearchProdAssign').keypress(function (e) {
 var key = e.which;
 if(key == 13)  // the enter key code
  {
    $('input[name = butAssignProd]').click();
    return false;  
  }
});

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$(function() {

  $('input[name="butAssignProd"]').click(function() {
    alert('Hello...!');
  });

  //press enter on text area..

  $('#txtSearchProdAssign').keypress(function(e) {
    var key = e.which;
    if (key == 13) // the enter key code
    {
      $('input[name = butAssignProd]').click();
      return false;
    }
  });

});

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<!DOCTYPE html>
<html>

<head>
  <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.8/jquery.min.js"></script>
  <meta charset=utf-8 />
  <title>JS Bin</title>
</head>

<body>
  <textarea id="txtSearchProdAssign"></textarea>
  <input type="text" name="butAssignProd" placeholder="click here">
</body>

</html>

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Find Demo in jsbin.com

What is the difference between a HashMap and a TreeMap?

You almost always use HashMap, you should only use TreeMap if you need your keys to be in a specific order.

Authenticating in PHP using LDAP through Active Directory

For those looking for a complete example check out http://www.exchangecore.com/blog/how-use-ldap-active-directory-authentication-php/.

I have tested this connecting to both Windows Server 2003 and Windows Server 2008 R2 domain controllers from a Windows Server 2003 Web Server (IIS6) and from a windows server 2012 enterprise running IIS 8.

How do I get an element to scroll into view, using jQuery?

Simple 2 steps for scrolling down to end or bottom.

Step1: get the full height of scrollable(conversation) div.

Step2: apply scrollTop on that scrollable(conversation) div using the value obtained in step1.

var fullHeight = $('#conversation')[0].scrollHeight;

$('#conversation').scrollTop(fullHeight);

Above steps must be applied for every append on the conversation div.

MySQL Foreign Key Error 1005 errno 150 primary key as foreign key

If your key is a CHAR/VARCHAR or something of that type, another possible problem is different collation. Check if the charset is the same.

What is the equivalent to getLastInsertId() in Cakephp?

There are several methods to get last inserted primary key id while using save method

$this->loadModel('Model');
$this->Model->save($this->data);

This will return last inserted id of the model current model

$this->Model->getLastInsertId();
$this->Model-> getInsertID();

This will return last inserted id of model with given model name

$this->Model->id;

This will return last inserted id of last loaded model

$this->id;

Where is the WPF Numeric UpDown control?

The given answers are OK. However, I wanted the buttons to auto hide, when mouse leave the control. Here is my code based on vercin answer above:

Style

<Style TargetType="{x:Type v:IntegerTextBox}">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type v:IntegerTextBox}">
                    <Grid Background="Transparent">
                        <Grid.RowDefinitions>
                            <RowDefinition Height="*"/>
                            <RowDefinition Height="*"/>
                        </Grid.RowDefinitions>
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="*"/>
                            <ColumnDefinition Width="Auto"/>
                        </Grid.ColumnDefinitions>
                        <TextBox Name="tbmain" Grid.ColumnSpan="2" Grid.RowSpan="2"
                                 Text="{Binding Value, Mode=TwoWay, NotifyOnSourceUpdated=True, 
                            NotifyOnValidationError=True, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type v:IntegerTextBox}}}" 
                                               Style="{StaticResource ValidationStyle}" />
                        <RepeatButton Name="PART_UpButton" BorderThickness="0" Grid.Column="1" Grid.Row="0"
                                      Width="13" Background="Transparent">
                            <Path Fill="Black" Data="M 0 3 L 6 3 L 3 0 Z"/>
                        </RepeatButton>
                        <RepeatButton Name="PART_DownButton" BorderThickness="0" Grid.Column="1" Grid.Row="1"
                                      Width="13" Background="Transparent">
                            <Path Fill="Black" Data="M 0 0 L 3 3 L 6 0 Z"/>
                        </RepeatButton>

                    </Grid>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsMouseOver"  Value="False">
                            <Setter Property="Visibility" TargetName="PART_UpButton" Value="Collapsed"/>
                            <Setter Property="Visibility" TargetName="PART_DownButton" Value="Collapsed"/>
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

Code

public partial class IntegerTextBox : UserControl
{
    public IntegerTextBox()
    {
        InitializeComponent();
    }

    public int Maximum
    {
        get { return (int)GetValue(MaximumProperty); }
        set { SetValue(MaximumProperty, value); }
    }
    public readonly static DependencyProperty MaximumProperty = DependencyProperty.Register(
        "Maximum", typeof(int), typeof(IntegerTextBox), new UIPropertyMetadata(int.MaxValue));



    public int Minimum
    {
        get { return (int)GetValue(MinimumProperty); }
        set { SetValue(MinimumProperty, value); }
    }
    public readonly static DependencyProperty MinimumProperty = DependencyProperty.Register(
        "Minimum", typeof(int), typeof(IntegerTextBox), new UIPropertyMetadata(int.MinValue));


    public int Value
    {
        get { return (int)GetValue(ValueProperty); }
        set { SetCurrentValue(ValueProperty, value); }
    }
    public readonly static DependencyProperty ValueProperty = DependencyProperty.Register(
        "Value", typeof(int), typeof(IntegerTextBox), new UIPropertyMetadata(0, (o,e)=>
        {
            IntegerTextBox tb = (IntegerTextBox)o;
            tb.RaiseValueChangedEvent(e);
        }));

    public event EventHandler<DependencyPropertyChangedEventArgs> ValueChanged;
    private void RaiseValueChangedEvent(DependencyPropertyChangedEventArgs e)
    {
        ValueChanged?.Invoke(this, e);
    }


    public int Step
    {
        get { return (int)GetValue(StepProperty); }
        set { SetValue(StepProperty, value); }
    }
    public readonly static DependencyProperty StepProperty = DependencyProperty.Register(
        "Step", typeof(int), typeof(IntegerTextBox), new UIPropertyMetadata(1));



    RepeatButton _UpButton;
    RepeatButton _DownButton;
    public override void OnApplyTemplate()
    {
        base.OnApplyTemplate();
        _UpButton = Template.FindName("PART_UpButton", this) as RepeatButton;
        _DownButton = Template.FindName("PART_DownButton", this) as RepeatButton;
        _UpButton.Click += btup_Click;
        _DownButton.Click += btdown_Click;
    }


    private void btup_Click(object sender, RoutedEventArgs e)
    {
        if (Value < Maximum)
        {
            Value += Step;
            if (Value > Maximum)
                Value = Maximum;
        }
    }

    private void btdown_Click(object sender, RoutedEventArgs e)
    {
        if (Value > Minimum)
        {
            Value -= Step;
            if (Value < Minimum)
                Value = Minimum;
        }
    }

}

Execute a shell function with timeout

There's an inline alternative also launching a subprocess of bash shell:


timeout 10s bash <<EOT
function echoFooBar {
  echo foo
}

echoFooBar
sleep 20
EOT

List of Java processes

You can use single command pgrep as well (doesn't require you to use pipes and multiple commands):

pgrep -fl java

Are the PUT, DELETE, HEAD, etc methods available in most web browsers?

XMLHttpRequest is a standard object in the JavaScript Object model.

According to Wikipedia, XMLHttpRequest first appeared in Internet Explorer 5 as an ActiveX object, but has since been made into a standard and has been included for use in JavaScript in the Mozilla family since 1.0, Apple Safari 1.2, Opera 7.60-p1, and IE 7.0.

The open() method on the object takes the HTTP Method as an argument - and is specified as taking any valid HTTP method (see the item number 5 of the link) - including GET, POST, HEAD, PUT and DELETE, as specified by RFC 2616.

As a side note IE 7–8 only permit the following HTTP methods: "GET", "POST", "HEAD", "PUT", "DELETE", "MOVE", "PROPFIND", "PROPPATCH", "MKCOL", "COPY", "LOCK", "UNLOCK", and "OPTIONS".

How can I SELECT multiple columns within a CASE WHEN on SQL Server?

The problem is that the CASE statement won't work in the way you're trying to use it. You can only use it to switch the value of one field in a query. If I understand what you're trying to do, you might need this:

SELECT 
   ActivityID,
   FieldName = CASE 
                  WHEN ActivityTypeID <> 2 THEN
                      (Some Aggregate Sub Query)
                  ELSE
                     (Some Aggregate Sub Query with diff result)
               END,
   FieldName2 = CASE
                  WHEN ActivityTypeID <> 2 THEN
                      (Some Aggregate Sub Query)
                  ELSE
                     (Some Aggregate Sub Query with diff result)
               END

could not extract ResultSet in hibernate

Another potential cause, for other people coming across the same error message is that this error will occur if you are accessing a table in a different schema from the one you have authenticated with.

In this case you would need to add the schema name to your entity entry:

@Table(name= "catalog", schema = "targetSchemaName")

Cross-browser custom styling for file upload button

The best example is this one, No hiding, No jQuery, It's completely pure CSS

http://css-tricks.com/snippets/css/custom-file-input-styling-webkitblink/

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.custom-file-input::-webkit-file-upload-button {_x000D_
    visibility: hidden;_x000D_
}_x000D_
_x000D_
.custom-file-input::before {_x000D_
    content: 'Select some files';_x000D_
    display: inline-block;_x000D_
    background: -webkit-linear-gradient(top, #f9f9f9, #e3e3e3);_x000D_
    border: 1px solid #999;_x000D_
    border-radius: 3px;_x000D_
    padding: 5px 8px;_x000D_
    outline: none;_x000D_
    white-space: nowrap;_x000D_
    -webkit-user-select: none;_x000D_
    cursor: pointer;_x000D_
    text-shadow: 1px 1px #fff;_x000D_
    font-weight: 700;_x000D_
    font-size: 10pt;_x000D_
}_x000D_
_x000D_
.custom-file-input:hover::before {_x000D_
    border-color: black;_x000D_
}_x000D_
_x000D_
.custom-file-input:active::before {_x000D_
    background: -webkit-linear-gradient(top, #e3e3e3, #f9f9f9);_x000D_
}

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<input type="file" class="custom-file-input">

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Dictionary returning a default value if the key does not exist

I know this is an old post and I do favor extension methods, but here's a simple class I use from time to time to handle dictionaries when I need default values.

I wish this were just part of the base Dictionary class.

public class DictionaryWithDefault<TKey, TValue> : Dictionary<TKey, TValue>
{
  TValue _default;
  public TValue DefaultValue {
    get { return _default; }
    set { _default = value; }
  }
  public DictionaryWithDefault() : base() { }
  public DictionaryWithDefault(TValue defaultValue) : base() {
    _default = defaultValue;
  }
  public new TValue this[TKey key]
  {
    get { 
      TValue t;
      return base.TryGetValue(key, out t) ? t : _default;
    }
    set { base[key] = value; }
  }
}

Beware, however. By subclassing and using new (since override is not available on the native Dictionary type), if a DictionaryWithDefault object is upcast to a plain Dictionary, calling the indexer will use the base Dictionary implementation (throwing an exception if missing) rather than the subclass's implementation.

How can I change property names when serializing with Json.net?

You could decorate the property you wish controlling its name with the [JsonProperty] attribute which allows you to specify a different name:

using Newtonsoft.Json;
// ...

[JsonProperty(PropertyName = "FooBar")]
public string Foo { get; set; }

Documentation: Serialization Attributes

Where is nodejs log file?

There is no log file. Each node.js "app" is a separate entity. By default it will log errors to STDERR and output to STDOUT. You can change that when you run it from your shell to log to a file instead.

node my_app.js > my_app_log.log 2> my_app_err.log

Alternatively (recommended), you can add logging inside your application either manually or with one of the many log libraries:

How can I tell if I'm running in 64-bit JVM or 32-bit JVM (from within a program)?

Complementary info:

On a running process you may use (at least with some recent Sun JDK5/6 versions):

$ /opt/java1.5/bin/jinfo -sysprops 14680 | grep sun.arch.data.model
Attaching to process ID 14680, please wait...
Debugger attached successfully.
Server compiler detected.
JVM version is 1.5.0_16-b02
sun.arch.data.model = 32

where 14680 is PID of jvm running the application. "os.arch" works too.

Also other scenarios are supported:

jinfo [ option ] pid
jinfo [ option ] executable core
jinfo [ option ] [server-id@]remote-hostname-or-IP

However consider also this note:

"NOTE - This utility is unsupported and may or may not be available in future versions of the JDK. In Windows Systems where dbgent.dll is not present, 'Debugging Tools for Windows' needs to be installed to have these tools working. Also the PATH environment variable should contain the location of jvm.dll used by the target process or the location from which the Crash Dump file was produced."

How to include JavaScript file or library in Chrome console?

If you're just starting out learning javascript & don't want to spend time creating an entire webpage just for embedding test scripts, just open Dev Tools in a new tab in Chrome Browser, and click on Console.

Then type out some test scripts: eg.

console.log('Aha!')

Then press Enter after every line (to submit for execution by Chrome)

or load your own "external script file":

document.createElement('script').src = 'http://example.com/file.js';

Then call your functions:

console.log(file.function('?????'))

Tested in Google Chrome 85.0.4183.121

What is the function __construct used for?

The constructor is a method which is automatically called on class instantiation. Which means the contents of a constructor are processed without separate method calls. The contents of a the class keyword parenthesis are passed to the constructor method.

java.lang.IllegalStateException: Fragment not attached to Activity

I Found Very Simple Solution isAdded() method which is one of the fragment method to identify that this current fragment is attached to its Activity or not.

we can use this like everywhere in fragment class like:

if(isAdded())
{

// using this method, we can do whatever we want which will prevent   **java.lang.IllegalStateException: Fragment not attached to Activity** exception.

}

In bash, how to store a return value in a variable?

The return value (aka exit code) is a value in the range 0 to 255 inclusive. It's used to indicate success or failure, not to return information. Any value outside this range will be wrapped.

To return information, like your number, use

echo "$value"

To print additional information that you don't want captured, use

echo "my irrelevant info" >&2

Finally, to capture it, use what you did:

 result=$(password_formula)

In other words:

echo "enter: "
        read input

password_formula()
{
        length=${#input}
        last_two=${input:length-2:length}
        first=`echo $last_two| sed -e 's/\(.\)/\1 /g'|awk '{print $2}'`
        second=`echo $last_two| sed -e 's/\(.\)/\1 /g'|awk '{print $1}'`
        let sum=$first+$second
        sum_len=${#sum}
        echo $second >&2
        echo $sum >&2

        if [ $sum -gt 9 ]
        then
               sum=${sum:1}
        fi

        value=$second$sum$first
        echo $value
}
result=$(password_formula)
echo "The value is $result"

What are .a and .so files?

Archive libraries (.a) are statically linked i.e when you compile your program with -c option in gcc. So, if there's any change in library, you need to compile and build your code again.

The advantage of .so (shared object) over .a library is that they are linked during the runtime i.e. after creation of your .o file -o option in gcc. So, if there's any change in .so file, you don't need to recompile your main program. But make sure that your main program is linked to the new .so file with ln command.

This will help you to build the .so files. http://www.yolinux.com/TUTORIALS/LibraryArchives-StaticAndDynamic.html

Hope this helps.

Failed to load resource: the server responded with a status of 404 (Not Found) css

you have defined the public dir in app root/public

app.use(express.static(__dirname + '/public'));

so you have to use:

./css/main.css

Create two blank lines in Markdown

If your Markdown compiler supports HTML, you can add <br/><br/> in the Markdown source.

How to delete Tkinter widgets from a window?

You simply use the destroy() method to delete the specified widgets like this:

lbl = tk.Label(....)

btn = tk.Button(....., command=lambda: lbl.destroy())

Using this you can completely destroy the specific widgets.

How to get the HTML for a DOM element in javascript

as outerHTML is IE only, use this function:

function getOuterHtml(node) {
    var parent = node.parentNode;
    var element = document.createElement(parent.tagName);
    element.appendChild(node);
    var html = element.innerHTML;
    parent.appendChild(node);
    return html;
}

creates a bogus empty element of the type parent and uses innerHTML on it and then reattaches the element back into the normal dom

Counting lines, words, and characters within a text file using Python

Try this:

fname = "feed.txt"

num_lines = 0
num_words = 0
num_chars = 0

with open(fname, 'r') as f:
    for line in f:
        words = line.split()

        num_lines += 1
        num_words += len(words)
        num_chars += len(line)

Back to your code:

fname = "feed.txt"
fname = open('feed.txt', 'r')

what's the point of this? fname is a string first and then a file object. You don't really use the string defined in the first line and you should use one variable for one thing only: either a string or a file object.

for line in feed:
    lines = line.split('\n')

line is one line from the file. It does not make sense to split('\n') it.

Detect if a NumPy array contains at least one non-numeric value?

Pfft! Microseconds! Never solve a problem in microseconds that can be solved in nanoseconds.

Note that the accepted answer:

iterates over the whole data, regardless of whether a nan is found
creates a temporary array of size N, which is redundant.

A better solution is to return True immediately when NAN is found:

import numba
import numpy as np

NAN = float("nan")

@numba.njit(nogil=True)
def _any_nans(a):
    for x in a:
        if np.isnan(x): return True
    return False

@numba.jit
def any_nans(a):
    if not a.dtype.kind=='f': return False
    return _any_nans(a.flat)

array1M = np.random.rand(1000000)
assert any_nans(array1M)==False
%timeit any_nans(array1M)  # 573us

array1M[0] = NAN
assert any_nans(array1M)==True
%timeit any_nans(array1M)  # 774ns  (!nanoseconds)

and works for n-dimensions:

array1M_nd = array1M.reshape((len(array1M)/2, 2))
assert any_nans(array1M_nd)==True
%timeit any_nans(array1M_nd)  # 774ns

Compare this to the numpy native solution:

def any_nans(a):
    if not a.dtype.kind=='f': return False
    return np.isnan(a).any()

array1M = np.random.rand(1000000)
assert any_nans(array1M)==False
%timeit any_nans(array1M)  # 456us

array1M[0] = NAN
assert any_nans(array1M)==True
%timeit any_nans(array1M)  # 470us

%timeit np.isnan(array1M).any()  # 532us

The early-exit method is 3 orders or magnitude speedup (in some cases). Not too shabby for a simple annotation.

How to catch exception correctly from http.request()?

There are several ways to do this. Both are very simple. Each of the examples works great. You can copy it into your project and test it.

The first method is preferable, the second is a bit outdated, but so far it works too.

1) Solution 1

// File - app.module.ts
import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { HttpClientModule } from '@angular/common/http';

import { AppComponent } from './app.component';
import { ProductService } from './product.service';
import { ProductModule } from './product.module';

@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule,
    HttpClientModule
  ],
  providers: [ProductService, ProductModule],
  bootstrap: [AppComponent]
})
export class AppModule { }



// File - product.service.ts
import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';

// Importing rxjs
import 'rxjs/Rx';
import { Observable } from 'rxjs/Rx';
import { catchError, tap } from 'rxjs/operators'; // Important! Be sure to connect operators

// There may be your any object. For example, we will have a product object
import { ProductModule } from './product.module';

@Injectable()
export class ProductService{
    // Initialize the properties.
    constructor(private http: HttpClient, private product: ProductModule){}

    // If there are no errors, then the object will be returned with the product data.
    // And if there are errors, we will get into catchError and catch them.
    getProducts(): Observable<ProductModule[]>{
        const url = 'YOUR URL HERE';
        return this.http.get<ProductModule[]>(url).pipe(
            tap((data: any) => {
                console.log(data);
            }),
            catchError((err) => {
                throw 'Error in source. Details: ' + err; // Use console.log(err) for detail
            })
        );
    }
}

2) Solution 2. It is old way but still works.

// File - app.module.ts
import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { HttpModule } from '@angular/http';

import { AppComponent } from './app.component';
import { ProductService } from './product.service';
import { ProductModule } from './product.module';

@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule,
    HttpModule
  ],
  providers: [ProductService, ProductModule],
  bootstrap: [AppComponent]
})
export class AppModule { }



// File - product.service.ts
import { Injectable } from '@angular/core';
import { Http, Response } from '@angular/http';

// Importing rxjs
import 'rxjs/Rx';
import { Observable } from 'rxjs/Rx';

@Injectable()
export class ProductService{
    // Initialize the properties.
    constructor(private http: Http){}

    // If there are no errors, then the object will be returned with the product data.
    // And if there are errors, we will to into catch section and catch error.
    getProducts(){
        const url = '';
        return this.http.get(url).map(
            (response: Response) => {
                const data = response.json();
                console.log(data);
                return data;
            }
        ).catch(
            (error: Response) => {
                console.log(error);
                return Observable.throw(error);
            }
        );
    }
}

How to reset Jenkins security settings from the command line?

For one who is using macOS, the new version just can be installed by homebrew. so for resting, this command line must be using:

brew services restart jenkins-lts

How to format html table with inline styles to look like a rendered Excel table?

This is quick-and-dirty (and not formally valid HTML5), but it seems to work -- and it is inline as per the question:

<table border='1' style='border-collapse:collapse'>

No further styling of <tr>/<td> tags is required (for a basic table grid).

How to add an extra source directory for maven to compile and include in the build jar?

NOTE: This solution will just move the java source files to the target/classes directory and will not compile the sources.

Update the `pom.xml` as -

<project>   
 ....
    <build>
      <resources>
        <resource>
          <directory>src/main/config</directory>
        </resource>
      </resources>
     ...
    </build>
...
</project>

how to run the command mvn eclipse:eclipse

Right click on the project

->Run As --> Run configurations.

Then select Maven Build

Then click new button to create a configuration of the selected type. Click on Browse workspace (now is Workspace...) then select your project and in goals specify eclipse:eclipse

Where do I find old versions of Android NDK?

I came across this just now doing the same search, and found the other answers are far too specific. I also google searched for downloading android-ndk-r8 and found next to nothing. To get the correct version, I instead went here:

https://developer.android.com/ndk/downloads/index.html

And copied the link to the download I needed, and pasted it into the URL bar. There, I edited the version to reflect what I wanted (for example, I changed r8b to r8). Then I pressed enter, and the correct download began.

As long as the naming conventions remain the same, this should work across all versions.

Edit: This convention did change. Some older versions are now available in the archives. For even older versions, refer to the links provided by the answer above.

Best practice for Django project working directory structure

You can use https://github.com/Mischback/django-project-skeleton repository.

Run below command:

$ django-admin startproject --template=https://github.com/Mischback/django-project-skeleton/archive/development.zip [projectname]

The structure is something like this:

[projectname]/                  <- project root
+-- [projectname]/              <- Django root
¦   +-- __init__.py
¦   +-- settings/
¦   ¦   +-- common.py
¦   ¦   +-- development.py
¦   ¦   +-- i18n.py
¦   ¦   +-- __init__.py
¦   ¦   +-- production.py
¦   +-- urls.py
¦   +-- wsgi.py
+-- apps/
¦   +-- __init__.py
+-- configs/
¦   +-- apache2_vhost.sample
¦   +-- README
+-- doc/
¦   +-- Makefile
¦   +-- source/
¦       +-- *snap*
+-- manage.py
+-- README.rst
+-- run/
¦   +-- media/
¦   ¦   +-- README
¦   +-- README
¦   +-- static/
¦       +-- README
+-- static/
¦   +-- README
+-- templates/
    +-- base.html
    +-- core
    ¦   +-- login.html
    +-- README

How to remove spaces from a string using JavaScript?

_x000D_

var str = '/var/www/site/Brand new document.docx';

document.write( str.replace(/\s\/g, '') );


----------

_x000D_

Highlight Bash/shell code in Markdown files

Using the knitr package:

```{r, engine='bash', code_block_name} ...

E.g.:

```{r, engine='bash', count_lines}
wc -l en_US.twitter.txt
```

You can also use:

engine='sh' for shell
engine='python' for Python
engine='perl', engine='haskell' and a bunch of other C-like languages and even gawk, AWK, etc.

Trigger 404 in Spring-MVC controller?

Starting from Spring 5.0, you don't necessarily need to create additional exceptions:

throw new ResponseStatusException(NOT_FOUND, "Unable to find resource");

Also, you can cover multiple scenarios with one, built-in exception and you have more control.

See more:

When to choose mouseover() and hover() function?

From the offical docs: (http://api.jquery.com/hover/)

The .hover() method binds handlers for both mouseenter and mouseleave events. You can use it to simply apply behavior to an element during the time the mouse is within the element.

Excel VBA: function to turn activecell to bold

I use

            chartRange = xlWorkSheet.Rows[1];
            chartRange.Font.Bold = true;

to turn the first-row-cells-font into bold. And it works, and I am using also Excel 2007.

You can call in VBA directly

            ActiveCell.Font.Bold = True

With this code I create a timestamp in the active cell, with bold font and yellow background

           Private Sub Worksheet_SelectionChange(ByVal Target As Range)
               ActiveCell.Value = Now()
               ActiveCell.Font.Bold = True
               ActiveCell.Interior.ColorIndex = 6
           End Sub

How to fix: /usr/lib/libstdc++.so.6: version `GLIBCXX_3.4.15' not found

Perhaps the answer to this question is of use here too: how to find libstdc++.so.6: that contain GLIBCXX_3.4.19 for RHEL 6?

curl -O http://ftp.de.debian.org/debian/pool/main/g/gcc-4.7/libstdc++6-4.7-dbg_4.7.2-5_i386.deb
ar -x libstdc++6-4.7-dbg_4.7.2-5_i386.deb && tar xvf data.tar.gz
mkdir backup
cp /usr/lib/libstdc++.so* backup/
cp ./usr/lib/i386-linux-gnu/debug/libstdc++.so.6.0.17 /usr/lib
ln -s libstdc++.so.6.0.17 libstdc++.so.6

How to extract extension from filename string in Javascript?

var x = "1.txt";
alert (x.substring(x.indexOf(".")+1));

note 1: this will not work if the filename is of the form file.example.txt
note 2: this will fail if the filename is of the form file

C# how to create a Guid value?

There's also ShortGuid - A shorter and url friendly GUID class in C#. It's available as a Nuget. More information here.

PM> Install-Package CSharpVitamins.ShortGuid

Usage:

Guid guid = Guid.NewGuid();
ShortGuid sguid1 = guid; // implicitly cast the guid as a shortguid
Console.WriteLine(sguid1);
Console.WriteLine(sguid1.Guid);

This produces a new guid, uses that guid to create a ShortGuid, and displays the two equivalent values in the console. Results would be something along the lines of:

ShortGuid: FEx1sZbSD0ugmgMAF_RGHw 
Guid:      b1754c14-d296-4b0f-a09a-030017f4461f

What is the JUnit XML format specification that Hudson supports?

I couldn't find any good information on this, so I did some trial and error. The following attributes and fields (and only these) are recognized by Jenkins (v1.585).

<?xml version="1.0" encoding="UTF-8"?>
<testsuite>

  <!-- if your classname does not include a dot, the package defaults to "(root)" -->
  <testcase name="my testcase" classname="my package.my classname" time="29">

    <!-- If the test didn't pass, specify ONE of the following 3 cases -->

    <!-- option 1 --> <skipped />
    <!-- option 2 --> <failure message="my failure message">my stack trace</failure>
    <!-- option 3 --> <error message="my error message">my crash report</error>

    <system-out>my STDOUT dump</system-out>

    <system-err>my STDERR dump</system-err>

  </testcase>

</testsuite>

(I started with this sample XML document and worked backwards from there.)

How to get json key and value in javascript?

A simple approach instead of using JSON.parse

 success: function(response){
     var resdata = response;
     alert(resdata['name']);
}

Creating executable files in Linux

No need to hack your editor, or switch editors.

Instead we can come up with a script to watch your development directories and chmod files as they're created. This is what I've done in the attached bash script. You probably want to read through the comments and edit the 'config' section as fits your needs, then I would suggest putting it in your $HOME/bin/ directory and adding its execution to your $HOME/.login or similar file. Or you can just run it from the terminal.

This script does require inotifywait, which comes in the inotify-tools package on Ubuntu,

sudo apt-get install inotify-tools

Suggestions/edits/improvements are welcome.

#!/usr/bin/env bash

# --- usage --- #
# Depends: 'inotifywait' available in inotify-tools on Ubuntu
# 
# Edit the 'config' section below to reflect your working directory, WORK_DIR,
# and your watched directories, WATCH_DIR. Each directory in WATCH_DIR will
# be logged by inotify and this script will 'chmod +x' any new files created
# therein. If SUBDIRS is 'TRUE' this script will watch WATCH_DIRS recursively.
# I recommend adding this script to your $HOME/.login or similar to have it
# run whenever you log into a shell, eg 'echo "watchdirs.sh &" >> ~/.login'.
# This script will only allow one instance of itself to run at a time.

# --- config --- #

WORK_DIR="$HOME/path/to/devel" # top working directory (for cleanliness?)
WATCH_DIRS=" \
    $WORK_DIR/dirA \
    $WORK_DIR/dirC \
    "                          # list of directories to watch
SUBDIRS="TRUE"                 # watch subdirectories too
NOTIFY_ARGS="-e create -q"     # watch for create events, non-verbose


# --- script starts here --- #
# probably don't need to edit beyond this point

# kill all previous instances of myself
SCRIPT="bash.*`basename $0`"
MATCHES=`ps ax | egrep $SCRIPT | grep -v grep | awk '{print $1}' | grep -v $$`
kill $MATCHES >& /dev/null

# set recursive notifications (for subdirectories)
if [ "$SUBDIRS" = "TRUE" ] ; then
    RECURSE="-r"
else
    RECURSE=""
fi

while true ; do
    # grab an event
    EVENT=`inotifywait $RECURSE $NOTIFY_ARGS $WATCH_DIRS`

    # parse the event into DIR, TAGS, FILE
    OLDIFS=$IFS ; IFS=" " ; set -- $EVENT
    E_DIR=$1
    E_TAGS=$2
    E_FILE=$3
    IFS=$OLDIFS

    # skip if it's not a file event or already executable (unlikely)
    if [ ! -f "$E_DIR$E_FILE" ] || [ -x "$E_DIR$E_FILE" ] ; then
        continue
    fi

    # set file executable
    chmod +x $E_DIR$E_FILE
done

How to access random item in list?

You can do:

list.OrderBy(x => Guid.NewGuid()).FirstOrDefault()

Centering text in a table in Twitter Bootstrap

One of the main feature of Bootstrap is that it alleviates the use of !important tag. Using the above answer would defeat the purpose. You can easily customise bootstrap by modifying the classes in your own css file and linking it after including the boostrap css.

How can I return pivot table output in MySQL?

select t3.name, sum(t3.prod_A) as Prod_A, sum(t3.prod_B) as Prod_B, sum(t3.prod_C) as    Prod_C, sum(t3.prod_D) as Prod_D, sum(t3.prod_E) as Prod_E  
from
(select t2.name as name, 
case when t2.prodid = 1 then t2.counts
else 0 end  prod_A, 

case when t2.prodid = 2 then t2.counts
else 0 end prod_B,

case when t2.prodid = 3 then t2.counts
else 0 end prod_C,

case when t2.prodid = 4 then t2.counts
else 0 end prod_D, 

case when t2.prodid = "5" then t2.counts
else 0 end prod_E

from 
(SELECT partners.name as name, sales.products_id as prodid, count(products.name) as counts
FROM test.sales left outer join test.partners on sales.partners_id = partners.id
left outer join test.products on sales.products_id = products.id 
where sales.partners_id = partners.id and sales.products_id = products.id group by partners.name, prodid) t2) t3

group by t3.name ;

Linker Error C++ "undefined reference "

Your error shows you are not compiling file with the definition of the insert function. Update your command to include the file which contains the definition of that function and it should work.

What is the 'instanceof' operator used for in Java?

The java instanceof operator is used to test whether the object is an instance of the specified type (class or subclass or interface).

The instanceof in java is also known as type comparison operator as it compares the instance with type. It returns either true or false. If we apply the instanceof operator with any variable that has null value, it returns false.

From JDK 14+ which includes JEP 305 we can also do "Pattern Matching" for instanceof

Patterns basically test that a value has a certain type, and can extract information from the value when it has the matching type. Pattern matching allows a more clear and efficient expression of common logic in a system, namely the conditional removal of components from objects.

Before Java 14

if (obj instanceof String) {
    String str = (String) obj; // need to declare and cast again the object
    .. str.contains(..) ..
}else{
     str = ....
}

Java 14 enhancements

if (!(obj instanceof String str)) {
    .. str.contains(..) .. // no need to declare str object again with casting
} else {
    .. str....
}

We can also combine the type check and other conditions together

if (obj instanceof String str && str.length() > 4) {.. str.contains(..) ..}

The use of pattern matching in instanceof should reduce the overall number of explicit casts in Java programs.

PS: instanceOf will only match when the object is not null, then only it can be assigned to str.

What’s the difference between Response.Write() andResponse.Output.Write()?

See this:

The difference between Response.Write() and Response.Output.Write() in ASP.NET. The short answer is that the latter gives you String.Format-style output and the former doesn't. The long answer follows.

In ASP.NET the Response object is of type HttpResponse and when you say Response.Write you're really saying (basically) HttpContext.Current.Response.Write and calling one of the many overloaded Write methods of HttpResponse.

Response.Write then calls .Write() on it's internal TextWriter object:

public void Write(object obj){ this._writer.Write(obj);}

HttpResponse also has a Property called Output that is of type, yes, TextWriter, so:

public TextWriter get_Output(){ return this._writer; }

Which means you can do the Response whatever a TextWriter will let you. Now, TextWriters support a Write() method aka String.Format, so you can do this:

Response.Output.Write("Scott is {0} at {1:d}", "cool",DateTime.Now);

But internally, of course, this is happening:

public virtual void Write(string format, params object[] arg)
{ 
this.Write(string.Format(format, arg)); 
}

What is Parse/parsing?

Parsing can be considered as a synonym of "Breaking down into small pieces" and then analysing what is there or using it in a modified way. In Java, Strings are parsed into Decimal, Octal, Binary, Hexadecimal, etc. It is done if your application is taking input from the user in the form of string but somewhere in your application you want to use that input in the form of an integer or of double type. It is not same as type casting. For type casting the types used should be compatible in order to caste but nothing such in parsing.

How to create a timer using tkinter?

from tkinter import *
import time
tk=Tk()
def clock():
    t=time.strftime('%I:%M:%S',time.localtime())
    if t!='':
        label1.config(text=t,font='times 25')
    tk.after(100,clock)
label1=Label(tk,justify='center')
label1.pack()
clock()
tk.mainloop()

How do you print in a Go test using the "testing" package?

The *_test.go file is a Go source like the others, you can initialize a new logger every time if you need to dump complex data structure, here an example:

// initZapLog is delegated to initialize a new 'log manager'
func initZapLog() *zap.Logger {
    config := zap.NewDevelopmentConfig()
    config.EncoderConfig.EncodeLevel = zapcore.CapitalColorLevelEncoder
    config.EncoderConfig.TimeKey = "timestamp"
    config.EncoderConfig.EncodeTime = zapcore.ISO8601TimeEncoder
    logger, _ := config.Build()
    return logger
}

Then, every time, in every test:

func TestCreateDB(t *testing.T) {
    loggerMgr := initZapLog()
    // Make logger avaible everywhere
    zap.ReplaceGlobals(loggerMgr)
    defer loggerMgr.Sync() // flushes buffer, if any
    logger := loggerMgr.Sugar()
    logger.Debug("START")
    conf := initConf()
    /* Your test here
    if false {
        t.Fail()
    }*/
}

How do I change a TCP socket to be non-blocking?

It is sometimes convenient to employ the "send/recv" family of system calls. If the flags parameter contains the MSG_DONTWAIT flag, each call will behave similar to a socket having the O_NONBLOCK flag set.

ssize_t send(int sockfd, const void *buf, size_t len, int flags);

ssize_t recv(int sockfd, void *buf, size_t len, int flags);

Java 256-bit AES Password-Based Encryption

Consider using the Spring Security Crypto Module

The Spring Security Crypto module provides support for symmetric encryption, key generation, and password encoding. The code is distributed as part of the core module but has no dependencies on any other Spring Security (or Spring) code.

It's provides a simple abstraction for encryption and seems to match what's required here,

The "standard" encryption method is 256-bit AES using PKCS #5's PBKDF2 (Password-Based Key Derivation Function #2). This method requires Java 6. The password used to generate the SecretKey should be kept in a secure place and not be shared. The salt is used to prevent dictionary attacks against the key in the event your encrypted data is compromised. A 16-byte random initialization vector is also applied so each encrypted message is unique.

A look at the internals reveals a structure similar to erickson's answer.

As noted in the question, this also requires the Java Cryptography Extension (JCE) Unlimited Strength Jurisdiction Policy (else you'll encounter InvalidKeyException: Illegal Key Size). It's downloadable for Java 6, Java 7 and Java 8.

Example usage

import org.springframework.security.crypto.encrypt.Encryptors;
import org.springframework.security.crypto.encrypt.TextEncryptor;
import org.springframework.security.crypto.keygen.KeyGenerators;

public class CryptoExample {
    public static void main(String[] args) {
        final String password = "I AM SHERLOCKED";  
        final String salt = KeyGenerators.string().generateKey();
        
        TextEncryptor encryptor = Encryptors.text(password, salt);      
        System.out.println("Salt: \"" + salt + "\"");
        
        String textToEncrypt = "*royal secrets*";
        System.out.println("Original text: \"" + textToEncrypt + "\"");
        
        String encryptedText = encryptor.encrypt(textToEncrypt);
        System.out.println("Encrypted text: \"" + encryptedText + "\"");
        
        // Could reuse encryptor but wanted to show reconstructing TextEncryptor
        TextEncryptor decryptor = Encryptors.text(password, salt);
        String decryptedText = decryptor.decrypt(encryptedText);
        System.out.println("Decrypted text: \"" + decryptedText + "\"");
        
        if(textToEncrypt.equals(decryptedText)) {
            System.out.println("Success: decrypted text matches");
        } else {
            System.out.println("Failed: decrypted text does not match");
        }       
    }
}

And sample output,

Salt: "feacbc02a3a697b0"
Original text: "*royal secrets*"
Encrypted text: "7c73c5a83fa580b5d6f8208768adc931ef3123291ac8bc335a1277a39d256d9a" 
Decrypted text: "*royal secrets*"
Success: decrypted text matches

Problems after upgrading to Xcode 10: Build input file cannot be found

Go to Xcode-> File -> Project Setting
Change Build System:-"Legacy Build System".
Clean,Build and hit Run.

How to link HTML5 form action to Controller ActionResult method in ASP.NET MVC 4

you make the use of the HTML Helper and have

    @using(Html.BeginForm())
    {
        Username: <input type="text" name="username" /> <br />
        Password: <input type="text" name="password" /> <br />
        <input type="submit" value="Login">
        <input type="submit" value="Create Account"/>
    }

or use the Url helper

<form method="post" action="@Url.Action("MyAction", "MyController")" >

Html.BeginForm has several (13) overrides where you can specify more information, for example, a normal use when uploading files is using:

@using(Html.BeginForm("myaction", "mycontroller", FormMethod.Post, new {enctype = "multipart/form-data"}))
{
    < ... >
}

If you don't specify any arguments, the Html.BeginForm() will create a POST form that points to your current controller and current action. As an example, let's say you have a controller called Posts and an action called Delete

public ActionResult Delete(int id)
{
   var model = db.GetPostById(id);
   return View(model);
}

[HttpPost]
public ActionResult Delete(int id)
{
    var model = db.GetPostById(id);
    if(model != null) 
        db.DeletePost(id);

    return RedirectToView("Index");
}

and your html page would be something like:

<h2>Are you sure you want to delete?</h2>
<p>The Post named <strong>@Model.Title</strong> will be deleted.</p>

@using(Html.BeginForm())
{
    <input type="submit" class="btn btn-danger" value="Delete Post"/>
    <text>or</text>
    @Url.ActionLink("go to list", "Index")
}

MySQL "NOT IN" query

Be carefull NOT IN is not an alias for <> ANY, but for <> ALL!

http://dev.mysql.com/doc/refman/5.0/en/any-in-some-subqueries.html

SELECT c FROM t1 LEFT JOIN t2 USING (c) WHERE t2.c IS NULL

cant' be replaced by

SELECT c FROM t1 WHERE c NOT IN (SELECT c FROM t2)

You must use

SELECT c FROM t1 WHERE c <> ANY (SELECT c FROM t2)

Getting Data from Android Play Store

Disclaimer: I am from 42matters, who provides this data already on https://42matters.com/api , feel free to check it out or drop us a line.

As lenik mentioned there are open-source libraries that already help with obtaining some data from GPlay. If you want to build one yourself you can try to parse the Google Play App page, but you should pay attention to the following:

Make sure the URL you are trying to parse is not blocked in robots.txt - e.g. https://play.google.com/robots.txt
Make sure that you are not doing it too often, Google will throttle and potentially blacklist you if you are doing it too much.
Send a correct User-Agent header to actually show you are a bot
The page of an app is big - make sure you accept gzip and request the mobile version
GPlay website is not an API, it doesn't care that you parse it so it will change over time. Make sure you handle changes - e.g. by having test to make sure you get what you expected.

So that in mind getting one page metadata is a matter of fetching the page html and parsing it properly. With JSoup you can try:

      HttpClient httpClient = HttpClientBuilder.create().build();
      HttpGet request = new HttpGet(crawlUrl);
      HttpResponse rsp = httpClient.execute(request);

      int statusCode = rsp.getStatusLine().getStatusCode();

      if (statusCode == 200) {
           String content = EntityUtils.toString(rsp.getEntity());    
           Document doc = Jsoup.parse(content);
           //parse content, whatever you need
           Element price = doc.select("[itemprop=price]").first();
      }

For that very simple use case that should get you started. However, the moment you want to do more interesting stuff, things get complicated:

Search is forbidden in robots.
Keeping app metadata up-to-date is hard to do. There are more than 2.2m apps, if you want to refresh their metadata daily there are 2.2 requests/day, which will 1) get blocked immediately, 2) costs a lot of money - pessimistic 220gb data transfer per day if one app is 100k
How do you discover new apps
How do you get pricing in each country, translations of each language

The list goes on. If you don't want to do all this by yourself, you can consider 42matters API, which supports lookup and search, top google charts, advanced queries and filters. And this for 35 languages and more than 50 countries.

[2]:

How to check currently internet connection is available or not in android

  public  boolean isInternetConnection()
    {
        ConnectivityManager connectivityManager = (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);
        if(connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).getState() == NetworkInfo.State.CONNECTED ||
                connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI).getState() == NetworkInfo.State.CONNECTED) {
            //we are connected to a network
            return  true;
        }
        else {
            return false;
        }
    }

PHP prepend leading zero before single digit number, on-the-fly

You can use sprintf: http://php.net/manual/en/function.sprintf.php

<?php
$num = 4;
$num_padded = sprintf("%02d", $num);
echo $num_padded; // returns 04
?>

It will only add the zero if it's less than the required number of characters.

Edit: As pointed out by @FelipeAls:

When working with numbers, you should use %d (rather than %s), especially when there is the potential for negative numbers. If you're only using positive numbers, either option works fine.

For example:

sprintf("%04s", 10); returns 0010
sprintf("%04s", -10); returns 0-10

Where as:

sprintf("%04d", 10); returns 0010
sprintf("%04d", -10); returns -010

How do I get HTTP Request body content in Laravel?

For those who are still getting blank response with $request->getContent(), you can use:

$request->all()

e.g:

public function foo(Request $request){
   $bodyContent = $request->all();
}

How to use a calculated column to calculate another column in the same view

You have to include the expression for your calculated column:

SELECT  
ColumnA,  
ColumnB,  
ColumnA + ColumnB AS calccolumn1  
(ColumnA + ColumnB) / ColumnC AS calccolumn2

Now() function with time trim

I would prefer to make a function that doesn't work with strings:

'---------------------------------------------------------------------------------------
' Procedure : RemoveTimeFromDate
' Author    : berend.nieuwhof
' Date      : 15-8-2013
' Purpose   : removes the time part of a String and returns the date as a date
'---------------------------------------------------------------------------------------
'
Public Function RemoveTimeFromDate(DateTime As Date) As Date


    Dim dblNumber As Double

    RemoveTimeFromDate = CDate(Floor(CDbl(DateTime)))

End Function

Private Function Floor(ByVal x As Double, Optional ByVal Factor As Double = 1) As Double
    Floor = Int(x / Factor) * Factor
End Function

How to Determine the Screen Height and Width in Flutter

Getting width is easy but height can be tricky, following are the ways to deal with height

// Full screen width and height
double width = MediaQuery.of(context).size.width;
double height = MediaQuery.of(context).size.height;

// Height (without SafeArea)
var padding = MediaQuery.of(context).padding;
double height1 = height - padding.top - padding.bottom;

// Height (without status bar)
double height2 = height - padding.top;

// Height (without status and toolbar)
double height3 = height - padding.top - kToolbarHeight;

How to use ArrayList's get() method

ArrayList get(int index) method is used for fetching an element from the list. We need to specify the index while calling get method and it returns the value present at the specified index.

public Element get(int index)

Example : In below example we are getting few elements of an arraylist by using get method.

package beginnersbook.com;
import java.util.ArrayList;
public class GetMethodExample {
   public static void main(String[] args) {
       ArrayList<String> al = new ArrayList<String>();
       al.add("pen");
       al.add("pencil");
       al.add("ink");
       al.add("notebook");
       al.add("book");
       al.add("books");
       al.add("paper");
       al.add("white board");

       System.out.println("First element of the ArrayList: "+al.get(0));
       System.out.println("Third element of the ArrayList: "+al.get(2));
       System.out.println("Sixth element of the ArrayList: "+al.get(5));
       System.out.println("Fourth element of the ArrayList: "+al.get(3));
   }
}

Output:

First element of the ArrayList: pen
Third element of the ArrayList: ink
Sixth element of the ArrayList: books
Fourth element of the ArrayList: notebook

How to calculate DATE Difference in PostgreSQL?

This is how I usually do it. A simple number of days perspective of B minus A.

DATE_PART('day', MAX(joindate) - MIN(joindate)) as date_diff

Reverting to a previous revision using TortoiseSVN

The Revert command in the context menu ignores your edits and returns the working copy to its previous state. You may also select the desired revision other than the "Head" when you "CheckOut" from the repository.

Login credentials not working with Gmail SMTP

I beleive I'm little late here. But I think this would help for the new peeps! If you're using smtp.gmail.com , then you have to do the following:

Turn on the less secure apps
You'll get the security mail in your gmail inbox, Click Yes,it's me in that.
Now run your code again.

lists and arrays in VBA

You will have to change some of your data types but the basics of what you just posted could be converted to something similar to this given the data types I used may not be accurate.

Dim DateToday As String: DateToday = Format(Date, "yyyy/MM/dd")
Dim Computers As New Collection
Dim disabledList As New Collection
Dim compArray(1 To 1) As String

'Assign data to first item in array
compArray(1) = "asdf"

'Format = Item, Key
Computers.Add "ErrorState", "Computer Name"

'Prints "ErrorState"
Debug.Print Computers("Computer Name")

Collections cannot be sorted so if you need to sort data you will probably want to use an array.

Here is a link to the outlook developer reference. http://msdn.microsoft.com/en-us/library/office/ff866465%28v=office.14%29.aspx

Another great site to help you get started is http://www.cpearson.com/Excel/Topic.aspx

Moving everything over to VBA from VB.Net is not going to be simple since not all the data types are the same and you do not have the .Net framework. If you get stuck just post the code you're stuck converting and you will surely get some help!

Edit:

Sub ArrayExample()
    Dim subject As String
    Dim TestArray() As String
    Dim counter As Long

    subject = "Example"
    counter = Len(subject)

    ReDim TestArray(1 To counter) As String

    For counter = 1 To Len(subject)
        TestArray(counter) = Right(Left(subject, counter), 1)
    Next
End Sub

asp.net validation to make sure textbox has integer values

Use Int32.TryParse.

 int integer;
 Int32.TryParse(Textbox.Text, out integer)

It will return a bool so you can see if they entered a valid integer.

Android XXHDPI resources

The resolution is 480 dpi, the launcher icon is 144*144px all is scaled 3x respect to mdpi (so called "base", "baseline" or "normal") sizes.

Class vs. static method in JavaScript

Just additional notes. Using class ES6, When we create static methods..the Javacsript engine set the descriptor attribute a lil bit different from the old-school "static" method

function Car() {

}

Car.brand = function() {
  console.log('Honda');
}

console.log(
  Object.getOwnPropertyDescriptors(Car)
);

it sets internal attribute (descriptor property) for brand() to

..
brand: [object Object] {
    configurable: true,
    enumerable: true,
    value: ..
    writable: true

}
..

compared to

class Car2 {
   static brand() {
     console.log('Honda');
   }
}

console.log(
  Object.getOwnPropertyDescriptors(Car2)
);

that sets internal attribute for brand() to

..
brand: [object Object] {
    configurable: true,
    enumerable: false,
    value:..
    writable: true
  }

..

see that enumerable is set to false for static method in ES6.

it means you cant use the for-in loop to check the object

for (let prop in Car) {
  console.log(prop); // brand
}

for (let prop in Car2) {
  console.log(prop); // nothing here
}

static method in ES6 is treated like other's class private property (name, length, constructor) except that static method is still writable thus the descriptor writable is set to true { writable: true }. it also means that we can override it

Car2.brand = function() {
   console.log('Toyota');
};

console.log(
  Car2.brand() // is now changed to toyota
);

How to JSON serialize sets?

JSON notation has only a handful of native datatypes (objects, arrays, strings, numbers, booleans, and null), so anything serialized in JSON needs to be expressed as one of these types.

As shown in the json module docs, this conversion can be done automatically by a JSONEncoder and JSONDecoder, but then you would be giving up some other structure you might need (if you convert sets to a list, then you lose the ability to recover regular lists; if you convert sets to a dictionary using dict.fromkeys(s) then you lose the ability to recover dictionaries).

A more sophisticated solution is to build-out a custom type that can coexist with other native JSON types. This lets you store nested structures that include lists, sets, dicts, decimals, datetime objects, etc.:

from json import dumps, loads, JSONEncoder, JSONDecoder
import pickle

class PythonObjectEncoder(JSONEncoder):
    def default(self, obj):
        if isinstance(obj, (list, dict, str, unicode, int, float, bool, type(None))):
            return JSONEncoder.default(self, obj)
        return {'_python_object': pickle.dumps(obj)}

def as_python_object(dct):
    if '_python_object' in dct:
        return pickle.loads(str(dct['_python_object']))
    return dct

Here is a sample session showing that it can handle lists, dicts, and sets:

>>> data = [1,2,3, set(['knights', 'who', 'say', 'ni']), {'key':'value'}, Decimal('3.14')]

>>> j = dumps(data, cls=PythonObjectEncoder)

>>> loads(j, object_hook=as_python_object)
[1, 2, 3, set(['knights', 'say', 'who', 'ni']), {u'key': u'value'}, Decimal('3.14')]

Alternatively, it may be useful to use a more general purpose serialization technique such as YAML, Twisted Jelly, or Python's pickle module. These each support a much greater range of datatypes.

How to search for occurrences of more than one space between words in a line

[ ]{2,}

SPACE (2 or more)

You could also check that before and after those spaces words follow. (not other whitespace like tabs or new lines)

\w[ ]{2,}\w

the same, but you can also pick (capture) only the spaces for tasks like replacement

\w([ ]{2,})\w

or see that before and after spaces there is anything, not only word characters (except whitespace)

[^\s]([ ]{2,})[^\s]

GoogleMaps API KEY for testing

There seems no way to have google maps api key free without credit card. To test the functionality of google map you can use it while leaving the api key field "EMPTY". It will show a message saying "For Development Purpose Only". And that way you can test google map functionality without putting billing information for google map api key.

<script src="https://maps.googleapis.com/maps/api/js?key=&callback=initMap" async defer></script>

How do I escape only single quotes?

You can use the addcslashes function to get this done like so:

echo addcslashes($text, "'\\");

Rename multiple files based on pattern in Unix

rename fgh jkl fgh*

How to add ASP.NET 4.0 as Application Pool on IIS 7, Windows 7

Chances are you need to install .NET 4 (Which will also create a new AppPool for you)

First make sure you have IIS installed then perform the following steps:

Open your command prompt (Windows + R) and type cmd and press ENTER
^{You may need to start this as an administrator if you have UAC enabled.

To do so, locate the exe (usually you can start typing with Start Menu open), right click and select "Run as Administrator"}
Type cd C:\Windows\Microsoft.NET\Framework\v4.0.30319\ and press ENTER.
Type aspnet_regiis.exe -ir and press ENTER again.
- If this is a fresh version of IIS (no other sites running on it) or you're not worried about the hosted sites breaking with a framework change you can use -i instead of -ir. This will change their AppPools for you and steps 5-on shouldn't be necessary.
- at this point you will see it begin working on installing .NET's framework in to IIS for you
Close the DOS prompt, re-open your start menu and right click Computer and select Manage
Expand the left-hand side (Services and Applications) and select Internet Information Services
- You'll now have a new applet within the content window exclusively for IIS.
Expand out your computer and locate the Application Pools node, and select it. (You should now see ASP.NET v4.0 listed)
Expand out your Sites node and locate the site you want to modify (select it)
To the right you'll notice Basic Settings... just below the Edit Site text. Click this, and a new window should appear
Select the .NET 4 AppPool using the Select... button and click ok.
Restart the site, and you should be good-to-go.

(You can repeat steps 7-on for every site you want to apply .NET 4 on as well).

Additional References:

.NET 4 Framework
The framework for those that don't already have it.
How do I run a command with elevated privileges?
Directions on how to run the command prompt with Administrator rights.
aspnet_regiis.exe options
For those that might want to know what -ir or -i does (or the difference between them) or what other options are available. (I typically use -ir to prevent any older sites currently running from breaking on a framework change but that's up to you.)

Listen for key press in .NET console app

From the video curse Building .NET Console Applications in C# by Jason Roberts at http://www.pluralsight.com

We could do following to have multiple running process

  static void Main(string[] args)
    {
        Console.CancelKeyPress += (sender, e) =>
        {

            Console.WriteLine("Exiting...");
            Environment.Exit(0);
        };

        Console.WriteLine("Press ESC to Exit");

        var taskKeys = new Task(ReadKeys);
        var taskProcessFiles = new Task(ProcessFiles);

        taskKeys.Start();
        taskProcessFiles.Start();

        var tasks = new[] { taskKeys };
        Task.WaitAll(tasks);
    }

    private static void ProcessFiles()
    {
        var files = Enumerable.Range(1, 100).Select(n => "File" + n + ".txt");

        var taskBusy = new Task(BusyIndicator);
        taskBusy.Start();

        foreach (var file in files)
        {
            Thread.Sleep(1000);
            Console.WriteLine("Procesing file {0}", file);
        }
    }

    private static void BusyIndicator()
    {
        var busy = new ConsoleBusyIndicator();
        busy.UpdateProgress();
    }

    private static void ReadKeys()
    {
        ConsoleKeyInfo key = new ConsoleKeyInfo();

        while (!Console.KeyAvailable && key.Key != ConsoleKey.Escape)
        {

            key = Console.ReadKey(true);

            switch (key.Key)
            {
                case ConsoleKey.UpArrow:
                    Console.WriteLine("UpArrow was pressed");
                    break;
                case ConsoleKey.DownArrow:
                    Console.WriteLine("DownArrow was pressed");
                    break;

                case ConsoleKey.RightArrow:
                    Console.WriteLine("RightArrow was pressed");
                    break;

                case ConsoleKey.LeftArrow:
                    Console.WriteLine("LeftArrow was pressed");
                    break;

                case ConsoleKey.Escape:
                    break;

                default:
                    if (Console.CapsLock && Console.NumberLock)
                    {
                        Console.WriteLine(key.KeyChar);
                    }
                    break;
            }
        }
    }
}

internal class ConsoleBusyIndicator
{
    int _currentBusySymbol;

    public char[] BusySymbols { get; set; }

    public ConsoleBusyIndicator()
    {
        BusySymbols = new[] { '|', '/', '-', '\\' };
    }
    public void UpdateProgress()
    {
        while (true)
        {
            Thread.Sleep(100);
            var originalX = Console.CursorLeft;
            var originalY = Console.CursorTop;

            Console.Write(BusySymbols[_currentBusySymbol]);

            _currentBusySymbol++;

            if (_currentBusySymbol == BusySymbols.Length)
            {
                _currentBusySymbol = 0;
            }

            Console.SetCursorPosition(originalX, originalY);
        }
    }

Changing CSS Values with Javascript

Ok, it sounds like you want to change the global CSS so which will effictively change all elements of a peticular style at once. I've recently learned how to do this myself from a Shawn Olson tutorial. You can directly reference his code here.

Here is the summary:

You can retrieve the stylesheets via document.styleSheets. This will actually return an array of all the stylesheets in your page, but you can tell which one you are on via the document.styleSheets[styleIndex].href property. Once you have found the stylesheet you want to edit, you need to get the array of rules. This is called "rules" in IE and "cssRules" in most other browsers. The way to tell what CSSRule you are on is by the selectorText property. The working code looks something like this:

var cssRuleCode = document.all ? 'rules' : 'cssRules'; //account for IE and FF
var rule = document.styleSheets[styleIndex][cssRuleCode][ruleIndex];
var selector = rule.selectorText;  //maybe '#tId'
var value = rule.value;            //both selectorText and value are settable.

Let me know how this works for ya, and please comment if you see any errors.

Best dynamic JavaScript/JQuery Grid

Have a look at agiletoolkit.org as this has a simple to use CRUD which supports 2,4,6,7,9,10 and 12 out of the box (uses Ajax to defender the grid when adding,deleting data and it integrates with jquery.

I would post some examples but on an iPad at the moment.

TypeScript static classes

This is one way:

class SomeClass {
    private static myStaticVariable = "whatever";
    private static __static_ctor = (() => { /* do static constructor stuff :) */ })();
}

__static_ctor here is an immediately invoked function expression. Typescript will output code to call it at the end of the generated class.

Update: For generic types in static constructors, which are no longer allowed to be referenced by static members, you will need an extra step now:

class SomeClass<T> {
    static myStaticVariable = "whatever";
    private ___static_ctor = (() => { var someClass:SomeClass<T> ; /* do static constructor stuff :) */ })();
    private static __static_ctor = SomeClass.prototype.___static_ctor();
}

In any case, of course, you could just call the generic type static constructor after the class, such as:

class SomeClass<T> {
    static myStaticVariable = "whatever";
    private __static_ctor = (() => { var example: SomeClass<T>; /* do static constructor stuff :) */ })();
}
SomeClass.prototype.__static_ctor();

Just remember to NEVER use this in __static_ctor above (obviously).

Is it possible to open a Windows Explorer window from PowerShell?

Just use the Invoke-Item cmdlet. For example, if you want to open a explorer window on the current directory you can do:

Invoke-Item .

ValueError: could not convert string to float: id

Your data may not be what you expect -- it seems you're expecting, but not getting, floats.

A simple solution to figuring out where this occurs would be to add a try/except to the for-loop:

for i in range(0,N):
    w=f[i].split()
    l1=w[1:8]
    l2=w[8:15]
    try:
      list1=[float(x) for x in l1]
      list2=[float(x) for x in l2]
    except ValueError, e:
      # report the error in some way that is helpful -- maybe print out i
    result=stats.ttest_ind(list1,list2)
    print result[1]

Stored procedure with default parameters

I'd do this one of two ways. Since you're setting your start and end dates in your t-sql code, i wouldn't ask for parameters in the stored proc

Option 1

Create Procedure [Test] AS
    DECLARE @StartDate varchar(10)
    DECLARE @EndDate varchar(10)
    Set @StartDate = '201620' --Define start YearWeek
    Set @EndDate  = (SELECT CAST(DATEPART(YEAR,getdate()) AS varchar(4)) + CAST(DATEPART(WEEK,getdate())-1 AS varchar(2)))

SELECT 
*
FROM
    (SELECT DISTINCT [YEAR],[WeekOfYear] FROM [dbo].[DimDate] WHERE [Year]+[WeekOfYear] BETWEEN @StartDate AND @EndDate ) dimd
    LEFT JOIN [Schema].[Table1] qad ON (qad.[Year]+qad.[Week of the Year]) = (dimd.[Year]+dimd.WeekOfYear)

Option 2

Create Procedure [Test] @StartDate varchar(10),@EndDate varchar(10) AS

SELECT 
*
FROM
    (SELECT DISTINCT [YEAR],[WeekOfYear] FROM [dbo].[DimDate] WHERE [Year]+[WeekOfYear] BETWEEN @StartDate AND @EndDate ) dimd
    LEFT JOIN [Schema].[Table1] qad ON (qad.[Year]+qad.[Week of the Year]) = (dimd.[Year]+dimd.WeekOfYear)

Then run exec test '2016-01-01','2016-01-25'

Centering controls within a form in .NET (Winforms)?

You could achieve this with the use of anchors. Or more precisely the non use of them.

Controls are anchored by default to the top left of the form which means when the form size will be changed, their distance from the top left side of the form will remain constant. If you change the control anchor to bottom left, then the control will keep the same distance from the bottom and left sides of the form when the form if resized.

Turning off the anchor in a direction will keep the control centered in that direction when resizing.

NOTE: Turning off anchoring via the properties window in VS2015 may require entering None, None (instead of default Top,Left)

jQuery add image inside of div tag

Have you tried the following:

$('#theDiv').prepend('<img id="theImg" src="theImg.png" />')

Element-wise addition of 2 lists?

Although, the actual question does not want to iterate over the list to generate the result, but all the solutions that has been proposed does exactly that under-neath the hood!

To refresh: You cannot add two vectors without looking into all the vector elements. So, the algorithmic complexity of most of these solutions are Big-O(n). Where n is the dimension of the vector.

So, from an algorithmic point of view, using a for loop to iteratively generate the resulting list is logical and pythonic too. However, in addition, this method does not have the overhead of calling or importing any additional library.

# Assumption: The lists are of equal length.
resultList = [list1[i] + list2[i] for i in range(len(list1))]

The timings that are being showed/discussed here are system and implementation dependent, and cannot be reliable measure to measure the efficiency of the operation. In any case, the big O complexity of the vector addition operation is linear, meaning O(n).

How do I get ruby to print a full backtrace instead of a truncated one?

This produces the error description and nice clean, indented stacktrace:

begin               
 # Some exception throwing code
rescue => e
  puts "Error during processing: #{$!}"
  puts "Backtrace:\n\t#{e.backtrace.join("\n\t")}"
end

How to access my localhost from another PC in LAN?

Actualy you don't need an internet connection to use ip address. Each computer in LAN has an internal IP address you can discover by runing

ipconfig /all

in cmd.

You can use the ip address of the server (probabily something like 192.168.0.x or 10.0.0.x) to access the website remotely.

If you found the ip and still cannot access the website, it means WAMP is not configured to respond to that name ( what did you call me? 192.168.0.3? That's not my name. I'm Localhost ) and you have to modify ....../apache/config/httpd.conf

Listen *:80

How to Lazy Load div background images

I've found this on the plugin's official site:

<div class="lazy" data-original="img/bmw_m1_hood.jpg" style="background-image: url('img/grey.gif'); width: 765px; height: 574px;"></div>

$("div.lazy").lazyload({
      effect : "fadeIn"
});

Source: http://www.appelsiini.net/projects/lazyload/enabled_background.html

How do I get the last day of a month?

var lastDayOfMonth = DateTime.DaysInMonth(date.Year, date.Month);

Access to ES6 array element index inside for-of loop

Another approach could be using Array.prototype.forEach() as

_x000D_

Array.from({_x000D_
  length: 5_x000D_
}, () => Math.floor(Math.random() * 5)).forEach((val, index) => {_x000D_
  console.log(val, index)_x000D_
})

_x000D_

Pass a list to a function to act as multiple arguments

Since Python 3.5 you can unpack unlimited amount of lists.

PEP 448 - Additional Unpacking Generalizations

So this will work:

a = ['1', '2', '3', '4']
b = ['5', '6']
function_that_needs_strings(*a, *b)

Concatenating multiple text files into a single file in Bash

type [source folder]\*.[File extension] > [destination folder]\[file name].[File extension]

For Example:

type C:\*.txt > C:\1\all.txt

That will Take all the txt files in the C:\ Folder and save it in C:\1 Folder by the name of all.txt

type [source folder]\* > [destination folder]\[file name].[File extension]

For Example:

type C:\* > C:\1\all.txt

That will take all the files that are present in the folder and put there Content in C:\1\all.txt

Calculate difference between 2 date / times in Oracle SQL

Single query that will return time difference of two timestamp columns:

select INS_TS, MAIL_SENT_TS, extract( hour from (INS_TS - MAIL_SENT_TS) ) timeDiff 
from MAIL_NOTIFICATIONS;

what is the basic difference between stack and queue?

Stack is a LIFO (last in first out) data structure. The associated link to wikipedia contains detailed description and examples.

Queue is a FIFO (first in first out) data structure. The associated link to wikipedia contains detailed description and examples.

Counter inside xsl:for-each loop

    <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
    <xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/>
    <xsl:template match="/">
        <newBooks>
                <xsl:for-each select="books/book">
                        <newBook>
                                <countNo><xsl:value-of select="position()"/></countNo>
                                <title>
                                        <xsl:value-of select="title"/>
                                </title>
                        </newBook>
                </xsl:for-each>
        </newBooks>
    </xsl:template>
</xsl:stylesheet>

How do I get the current timezone name in Postgres 9.3?

It seems to work fine in Postgresql 9.5:

SELECT current_setting('TIMEZONE');

Get the year from specified date php

  public function getYear($pdate) {
    $date = DateTime::createFromFormat("Y-m-d", $pdate);
    return $date->format("Y");
}

public function getMonth($pdate) {
    $date = DateTime::createFromFormat("Y-m-d", $pdate);
    return $date->format("m");
}

public function getDay($pdate) {
    $date = DateTime::createFromFormat("Y-m-d", $pdate);
    return $date->format("d");
}

Android charting libraries

If you're looking for something more straight forward to implement (and it doesn't include pie/donut charts) then I recommend WilliamChart. Specially if motion takes an important role in your app design. In other hand if you want featured charts, then go for MPAndroidChart.

How do I handle too long index names in a Ruby on Rails ActiveRecord migration?

I have a project that uses generators a lot and needed this to be automatic, so I copied the index_name function from the rails source to override it. I added this in config/initializers/generated_index_name.rb:

# make indexes shorter for postgres
require "active_record/connection_adapters/abstract/schema_statements"
module ActiveRecord
  module ConnectionAdapters # :nodoc:
    module SchemaStatements
      def index_name(table_name, options) #:nodoc:
        if Hash === options
          if options[:column]
            "ix_#{table_name}_on_#{Array(options[:column]) * '__'}".slice(0,63)
          elsif options[:name]
            options[:name]
          else
            raise ArgumentError, "You must specify the index name"
          end
        else
          index_name(table_name, index_name_options(options))
        end
      end
    end
  end
end

It creates indexes like ix_assignments_on_case_id__project_id and just truncates it to 63 characters if it's still too long. That's still going to be non-unique if the table name is very long, but you can add complications like shortening the table name separately from the column names or actually checking for uniqueness.

Note, this is from a Rails 5.2 project; if you decide to do this, copy the source from your version.

C++ Remove new line from multiline string

The code removes all newlines from the string str.

O(N) implementation best served without comments on SO and with comments in production.

unsigned shift=0;
for (unsigned i=0; i<length(str); ++i){
    if (str[i] == '\n') {
        ++shift;
    }else{
        str[i-shift] = str[i];
    }
}
str.resize(str.length() - shift);

What does print(... sep='', '\t' ) mean?

sep='\t' is often used for Tab-delimited file.

Can we pass an array as parameter in any function in PHP?

Yes, we can pass arrays to a function.

$arr = array(“a” => “first”, “b” => “second”, “c” => “third”);

function user_defined($item, $key)
{
    echo $key.”-”.$item.”<br/>”;
} 

array_walk($arr, ‘user_defined’);

We can find more array functions here

http://skillrow.com/array-functions-in-php-part1/

How to check programmatically if an application is installed or not in Android?

So nicer with Kotlin suger:

  private fun isSomePackageInstalled(context: Context, packageName: String): Boolean {

    val packageManager = context.packageManager

    return runCatching { packageManager.getPackageInfo(packageName, 0) }.isSuccess
  }

How to Call Controller Actions using JQuery in ASP.NET MVC

You can easily call any controller's action using jQuery AJAX method like this:

Note in this example my controller name is Student

Controller Action

 public ActionResult Test()
 {
     return View();
 }

In Any View of this above controller you can call the Test() action like this:

<script src="http://ajax.aspnetcdn.com/ajax/jQuery/jquery-2.0.3.min.js"></script>
<script>
    $(document).ready(function () {
        $.ajax({
            url: "@Url.Action("Test", "Student")",
            success: function (result, status, xhr) {
                alert("Result: " + status + " " + xhr.status + " " + xhr.statusText)
            },
            error: function (xhr, status, error) {
                alert("Result: " + status + " " + error + " " + xhr.status + " " + xhr.statusText)
            }
        });
    });
</script>

How to refresh app upon shaking the device?

package anywheresoftware.b4a.student;

import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.util.FloatMath;

public class ShakeEventListener implements SensorEventListener {

    /*
     * The gForce that is necessary to register as shake.
     * Must be greater than 1G (one earth gravity unit).
     * You can install "G-Force", by Blake La Pierre
     * from the Google Play Store and run it to see how
     *  many G's it takes to register a shake
     */
    private static final float SHAKE_THRESHOLD_GRAVITY = 2.7F;
    private static int SHAKE_SLOP_TIME_MS = 500;
    private static final int SHAKE_COUNT_RESET_TIME_MS = 1000;

    private OnShakeListener mListener;
    private long mShakeTimestamp;
    private int mShakeCount;

    public void setOnShakeListener(OnShakeListener listener) {
        this.mListener = listener;
    }

    public interface OnShakeListener {
        public void onShake(int count);
    }

    @Override
    public void onAccuracyChanged(Sensor sensor, int accuracy) {
        // ignore
    }

    @Override
    public void onSensorChanged(SensorEvent event) {

        if (mListener != null) {
            float x = event.values[0];
            float y = event.values[1];
            float z = event.values[2];

            float gX = x / SensorManager.GRAVITY_EARTH;
            float gY = y / SensorManager.GRAVITY_EARTH;
            float gZ = z / SensorManager.GRAVITY_EARTH;

            // gForce will be close to 1 when there is no movement.
            float gForce = FloatMath.sqrt(gX * gX + gY * gY + gZ * gZ);

            if (gForce > SHAKE_THRESHOLD_GRAVITY) {
                final long now = System.currentTimeMillis();
                // ignore shake events too close to each other (500ms)
                if (mShakeTimestamp + getSHAKE_SLOP_TIME_MS() > now) {
                    return;
                }

                // reset the shake count after 3 seconds of no shakes
                if (mShakeTimestamp + SHAKE_COUNT_RESET_TIME_MS < now) {
                    mShakeCount = 0;
                }

                mShakeTimestamp = now;
                mShakeCount++;

                mListener.onShake(mShakeCount);
            }
        }
    }

    private long getSHAKE_SLOP_TIME_MS() {
        // TODO Auto-generated method stub
        return SHAKE_SLOP_TIME_MS;
    }

    public void setSHAKE_SLOP_TIME_MS(int sHAKE_SLOP_TIME_MS) {
        SHAKE_SLOP_TIME_MS = sHAKE_SLOP_TIME_MS;
    }   

}

Customize UITableView header section

Swift version of Lochana Tejas answer:

override func tableView(tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
    let view = UIView(frame: CGRectMake(0, 0, tableView.frame.size.width, 18))
    let label = UILabel(frame: CGRectMake(10, 5, tableView.frame.size.width, 18))
    label.font = UIFont.systemFontOfSize(14)
    label.text = list.objectAtIndex(indexPath.row) as! String
    view.addSubview(label)
    view.backgroundColor = UIColor.grayColor() // Set your background color

    return view
}

How to concatenate strings in windows batch file for loop?

In batch you could do it like this:

@echo off

setlocal EnableDelayedExpansion

set "string_list=str1 str2 str3 ... str10"

for %%s in (%string_list%) do (
  set "var=%%sxyz"
  svn co "!var!"
)

If you don't need the variable !var! elsewhere in the loop, you could simplify that to

@echo off

setlocal

set "string_list=str1 str2 str3 ... str10"

for %%s in (%string_list%) do svn co "%%sxyz"

However, like C.B. I'd prefer PowerShell if at all possible:

$string_list = 'str1', 'str2', 'str3', ... 'str10'

$string_list | ForEach-Object {
  $var = "${_}xyz"   # alternatively: $var = $_ + 'xyz'
  svn co $var
}

Again, this could be simplified if you don't need $var elsewhere in the loop:

$string_list = 'str1', 'str2', 'str3', ... 'str10'
$string_list | ForEach-Object { svn co "${_}xyz" }

@font-face src: local - How to use the local font if the user already has it?

If you want to check for local files first do:

@font-face {
font-family: 'Green Sans Web';
src:
    local('Green Web'),
    local('GreenWeb-Regular'),
    url('GreenWeb.ttf');
}

There is a more elaborate description of what to do here.

Adding up BigDecimals using Streams

Use this approach to sum the list of BigDecimal:

List<BigDecimal> values = ... // List of BigDecimal objects
BigDecimal sum = values.stream().reduce((x, y) -> x.add(y)).get();

This approach maps each BigDecimal as a BigDecimal only and reduces them by summing them, which is then returned using the get() method.

Here's another simple way to do the same summing:

List<BigDecimal> values = ... // List of BigDecimal objects
BigDecimal sum = values.stream().reduce(BigDecimal::add).get();

Update

If I were to write the class and lambda expression in the edited question, I would have written it as follows:

import java.math.BigDecimal;
import java.util.LinkedList;

public class Demo
{
  public static void main(String[] args)
  {
    LinkedList<Invoice> invoices = new LinkedList<>();
    invoices.add(new Invoice("C1", "I-001", BigDecimal.valueOf(.1), BigDecimal.valueOf(10)));
    invoices.add(new Invoice("C2", "I-002", BigDecimal.valueOf(.7), BigDecimal.valueOf(13)));
    invoices.add(new Invoice("C3", "I-003", BigDecimal.valueOf(2.3), BigDecimal.valueOf(8)));
    invoices.add(new Invoice("C4", "I-004", BigDecimal.valueOf(1.2), BigDecimal.valueOf(7)));

    // Java 8 approach, using Method Reference for mapping purposes.
    invoices.stream().map(Invoice::total).forEach(System.out::println);
    System.out.println("Sum = " + invoices.stream().map(Invoice::total).reduce((x, y) -> x.add(y)).get());
  }

  // This is just my style of writing classes. Yours can differ.
  static class Invoice
  {
    private String company;
    private String number;
    private BigDecimal unitPrice;
    private BigDecimal quantity;

    public Invoice()
    {
      unitPrice = quantity = BigDecimal.ZERO;
    }

    public Invoice(String company, String number, BigDecimal unitPrice, BigDecimal quantity)
    {
      setCompany(company);
      setNumber(number);
      setUnitPrice(unitPrice);
      setQuantity(quantity);
    }

    public BigDecimal total()
    {
      return unitPrice.multiply(quantity);
    }

    public String getCompany()
    {
      return company;
    }

    public void setCompany(String company)
    {
      this.company = company;
    }

    public String getNumber()
    {
      return number;
    }

    public void setNumber(String number)
    {
      this.number = number;
    }

    public BigDecimal getUnitPrice()
    {
      return unitPrice;
    }

    public void setUnitPrice(BigDecimal unitPrice)
    {
      this.unitPrice = unitPrice;
    }

    public BigDecimal getQuantity()
    {
      return quantity;
    }

    public void setQuantity(BigDecimal quantity)
    {
      this.quantity = quantity;
    }
  }
}

How to get the groups of a user in Active Directory? (c#, asp.net)

In case Translate works locally but not remotly e.i group.Translate(typeof(NTAccount)

If you want to have the application code executes using the LOGGED IN USER identity, then enable impersonation. Impersonation can be enabled thru IIS or by adding the following element in the web.config.

<system.web>
<identity impersonate="true"/>

If impersonation is enabled, the application executes using the permissions found in your user account. So if the logged in user has access, to a specific network resource, only then will he be able to access that resource thru the application.

Thank PRAGIM tech for this information from his diligent video

Windows authentication in asp.net Part 87:

https://www.youtube.com/watch?v=zftmaZ3ySMc

But impersonation creates a lot of overhead on the server

The best solution to allow users of certain network groups is to deny anonymous in the web config <authorization><deny users="?"/><authentication mode="Windows"/>

and in your code behind, preferably in the global.asax, use the HttpContext.Current.User.IsInRole :

Sub Session_Start(ByVal sender As Object, ByVal e As EventArgs)
If HttpContext.Current.User.IsInRole("TheDomain\TheGroup") Then
//code to do when user is in group
End If

NOTE: The Group must be written with a backslash \ i.e. "TheDomain\TheGroup"

How to cancel/abort jQuery AJAX request?

jQuery: Use this as a starting point - as inspiration. I solved it like this: (this is not a perfect solution, it just aborts the last instance and is WIP code)

var singleAjax = function singleAjax_constructor(url, params) {
    // remember last jQuery's get request
    if (this.lastInstance) {
        this.lastInstance.abort();  // triggers .always() and .fail()
        this.lastInstance = false;
    }

    // how to use Deferred : http://api.jquery.com/category/deferred-object/
    var $def = new $.Deferred();

    // pass the deferrer's request handlers into the get response handlers
    this.lastInstance = $.get(url, params)
        .fail($def.reject)         // triggers .always() and .fail()
        .success($def.resolve);    // triggers .always() and .done()

    // return the deferrer's "control object", the promise object
    return $def.promise();
}


// initiate first call
singleAjax('/ajax.php', {a: 1, b: 2})
    .always(function(a,b,c) {console && console.log(a,b,c);});

// second call kills first one
singleAjax('/ajax.php', {a: 1, b: 2})
    .always(function(a,b,c) {console && console.log(a,b,c);});
    // here you might use .always() .fail() .success() etc.

Access-Control-Allow-Origin Multiple Origin Domains?

Below answer is specific to C#, but the concept should be applicable to all the different platforms.

To allow Cross Origin Requests from a web api, You need to allow Option requests to your Application and Add below annotation at controller level.

[EnableCors(UrlString,Header, Method)] Now the origins can be passed only a s string. SO if you want to pass more than one URL in the request pass it as a comma seperated value.

UrlString = "https://a.hello.com,https://b.hello.com"

What exactly does numpy.exp() do?

exp(x) = e^x where e= 2.718281(approx)

import numpy as np

ar=np.array([1,2,3])
ar=np.exp(ar)
print ar

outputs:

[ 2.71828183  7.3890561  20.08553692]

How to fix HTTP 404 on Github Pages?

Go to settings section of your repository and choose master branch at the Source section and click save button after that refresh the page and you will be able to see the link of your page!.

Root element is missing

I had the same problem when i have trying to read xml that was extracted from archive to memory stream.

 MemoryStream SubSetupStream = new MemoryStream();
        using (ZipFile archive = ZipFile.Read(zipPath))
        {
            archive.Password = "SomePass";
            foreach  (ZipEntry file in archive)
            {
                file.Extract(SubSetupStream);
            }
        }

Problem was in these lines:

XmlDocument doc = new XmlDocument();
    doc.Load(SubSetupStream);

And solution is (Thanks to @Phil):

        if (SubSetupStream.Position>0)
        {
            SubSetupStream.Position = 0;
        }

Negate if condition in bash script

You can use unequal comparison -ne instead of -eq:

wget -q --tries=10 --timeout=20 --spider http://google.com
if [[ $? -ne 0 ]]; then
    echo "Sorry you are Offline"
    exit 1
fi

JSON character encoding - is UTF-8 well-supported by browsers or should I use numeric escape sequences?

Reading the json rfc (http://www.ietf.org/rfc/rfc4627.txt) it is clear that the preferred encoding is utf-8.

FYI, RFC 4627 is no longer the official JSON spec. It was obsoleted in 2014 by RFC 7159, which was then obsoleted in 2017 by RFC 8259, which is the current spec.

RFC 8259 states:

8.1. Character Encoding

JSON text exchanged between systems that are not part of a closed ecosystem MUST be encoded using UTF-8 [RFC3629].

Previous specifications of JSON have not required the use of UTF-8 when transmitting JSON text. However, the vast majority of JSON-based software implementations have chosen to use the UTF-8 encoding, to the extent that it is the only encoding that achieves interoperability.

Implementations MUST NOT add a byte order mark (U+FEFF) to the beginning of a networked-transmitted JSON text. In the interests of interoperability, implementations that parse JSON texts MAY ignore the presence of a byte order mark rather than treating it as an error.

Git vs Team Foundation Server

People need to put down the gun, step away from the ledge, and think for a minute. It turns out there are objective, concrete, and undeniable advantages to DVCS that will make a HUGE difference in a team's productivity.

It all comes down to Branching and Merging.

Before DVCS, the guiding principle was "Pray to God that you don't have to get into branching and merging. And if you do, at least beg Him to let it be very, very simple."

Now, with DVCS, branching (and merging) is so much improved, the guiding principle is, "Do it at the drop of a hat. It will give you a ton of benefits and not cause you any problems."

And that is a HUGE productivity booster for any team.

The problem is, for people to understand what I just said and be convinced that it is true, they have to first invest in a little bit of a learning curve. They don't have to learn Git or any other DVCS itself ... they just need to learn how Git does branching and merging. Read and re-read some articles and blog posts, taking it slow, and working through it until you see it. That might take the better part of 2 or 3 full days.

But once you see that, you won't even consider choosing a non-DVCS. Because there really are clear, objective, concrete advantages to DVCS, and the biggest wins are in the area of branching and merging.

Removing the remembered login and password list in SQL Server Management Studio

For those looking for the SSMS 2012 solution... see this answer:

Remove cached login 2012

Essentially, in 2012 you can delete the server from the server list dropdown which clears all cached logins for that server.

Works also in v17 (build 14.x).

Regular expression that doesn't contain certain string

By the power of Google I found a blogpost from 2007 which gives the following regex that matches string which don't contains a certain substring:

^((?!my string).)*$

It works as follows: it looks for zero or more (*) characters (.) which do not begin (?! - negative lookahead) your string and it stipulates that the entire string must be made up of such characters (by using the ^ and $ anchors). Or to put it an other way:

The entire string must be made up of characters which do not begin a given string, which means that the string doesn't contain the given substring.

How to develop Desktop Apps using HTML/CSS/JavaScript?

Sorry to burst your bubble but Spotify desktop client is just a Webkit-based browser. Of course it exposes specific additional functionality, but it's only able to run JS and render HTML/CSS because it has a JS engine as well as a Chromium rendering engine. This does not help you with coding a client-side web-app and deploying to multiple platforms.

What you're looking for is similar to Sencha Touch - a framework that allows for HTML5 apps to be natively deployed to iOS, Android and Blackberry devices. It basically acts as an intermediary between certain API calls and device-specific functionality available.

I have no experience with appcelerator, bit it appears to be doing exactly that - and get very favourable reviews online. You should give it a go (unless you wanted to go back to 1999 and roll with MS HTA ;)

C Macro definition to determine big endian or little endian machine?

#include <stdint.h>
#define IS_LITTLE_ENDIAN (*(uint16_t*)"\0\1">>8)
#define IS_BIG_ENDIAN (*(uint16_t*)"\1\0">>8)

Set custom attribute using JavaScript

Please use dataset

var article = document.querySelector('#electriccars'),
    data = article.dataset;

// data.columns -> "3"
// data.indexnumber -> "12314"
// data.parent -> "cars"

so in your case for setting data:

getElementById('item1').dataset.icon = "base2.gif";

How to access first element of JSON object array?

After you parse it with Javascript, try this:

mandrill_events[0].event

Python List vs. Array - when to use?

For almost all cases the normal list is the right choice. The arrays module is more like a thin wrapper over C arrays, which give you kind of strongly typed containers (see docs), with access to more C-like types such as signed/unsigned short or double, which are not part of the built-in types. I'd say use the arrays module only if you really need it, in all other cases stick with lists.

How to inject window into a service?

Actually its very simple to access window object here is my basic component and i tested it its working

import { Component, OnInit,Inject } from '@angular/core';
import {DOCUMENT} from '@angular/platform-browser';

@Component({
  selector: 'app-verticalbanners',
  templateUrl: './verticalbanners.component.html',
  styleUrls: ['./verticalbanners.component.css']
})
export class VerticalbannersComponent implements OnInit {

  constructor(){ }

  ngOnInit() {
    console.log(window.innerHeight );
  }

}

Copy directory contents into a directory with python

I found this code working:

from distutils.dir_util import copy_tree

# copy subdirectory example
fromDirectory = "/a/b/c"
toDirectory = "/x/y/z"

copy_tree(fromDirectory, toDirectory)

Reference:

ReactJS lifecycle method inside a function Component

Edit: With the introduction of Hooks it is possible to implement a lifecycle kind of behavior as well as the state in the functional Components. Currently

Hooks are a new feature proposal that lets you use state and other React features without writing a class. They are released in React as a part of v16.8.0

useEffect hook can be used to replicate lifecycle behavior, and useState can be used to store state in a function component.

Basic syntax:

useEffect(callbackFunction, [dependentProps]) => cleanupFunction

You can implement your use case in hooks like

const grid = (props) => {
    console.log(props);
    let {skuRules} = props;

    useEffect(() => {
        if(!props.fetched) {
            props.fetchRules();
        }
        console.log('mount it!');
    }, []); // passing an empty array as second argument triggers the callback in useEffect only after the initial render thus replicating `componentDidMount` lifecycle behaviour

    return(
        <Content title="Promotions" breadcrumbs={breadcrumbs} fetched={skuRules.fetched}>
            <Box title="Sku Promotion">
                <ActionButtons buttons={actionButtons} />
                <SkuRuleGrid 
                    data={skuRules.payload}
                    fetch={props.fetchSkuRules}
                />
            </Box>      
        </Content>  
    )
}

useEffect can also return a function that will be run when the component is unmounted. This can be used to unsubscribe to listeners, replicating the behavior of componentWillUnmount:

Eg: componentWillUnmount

useEffect(() => {
    window.addEventListener('unhandledRejection', handler);
    return () => {
       window.removeEventListener('unhandledRejection', handler);
    }
}, [])

To make useEffect conditional on specific events, you may provide it with an array of values to check for changes:

Eg: componentDidUpdate

componentDidUpdate(prevProps, prevState) {
     const { counter } = this.props;
     if (this.props.counter !== prevState.counter) {
      // some action here
     }
}

Hooks Equivalent

useEffect(() => {
     // action here
}, [props.counter]); // checks for changes in the values in this array

If you include this array, make sure to include all values from the component scope that change over time (props, state), or you may end up referencing values from previous renders.

There are some subtleties to using useEffect; check out the API Here.

Before v16.7.0

The property of function components is that they don't have access to Reacts lifecycle functions or the this keyword. You need to extend the React.Component class if you want to use the lifecycle function.

class Grid extends React.Component  {
    constructor(props) {
       super(props)
    }

    componentDidMount () {
        if(!this.props.fetched) {
            this.props.fetchRules();
        }
        console.log('mount it!');
    }
    render() {
    return(
        <Content title="Promotions" breadcrumbs={breadcrumbs} fetched={skuRules.fetched}>
            <Box title="Sku Promotion">
                <ActionButtons buttons={actionButtons} />
                <SkuRuleGrid 
                    data={skuRules.payload}
                    fetch={props.fetchSkuRules}
                />
            </Box>      
        </Content>  
    )
  }
}

Function components are useful when you only want to render your Component without the need of extra logic.

How to convert JSON data into a Python object

Use the json module (new in Python 2.6) or the simplejson module which is almost always installed.

Reloading the page gives wrong GET request with AngularJS HTML5 mode

There are few things to set up so your link in the browser will look like http://yourdomain.com/path and these are your angular config + server side

1) AngularJS

$routeProvider
  .when('/path', {
    templateUrl: 'path.html',
  });
$locationProvider
  .html5Mode(true);

2) server side, just put .htaccess inside your root folder and paste this

RewriteEngine On 
Options FollowSymLinks

RewriteBase /

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ /#/$1 [L]

More interesting stuff to read about html5 mode in angularjs and the configuration required per different environment https://github.com/angular-ui/ui-router/wiki/Frequently-Asked-Questions#how-to-configure-your-server-to-work-with-html5mode Also this question might help you $location / switching between html5 and hashbang mode / link rewriting

What's the best way to determine the location of the current PowerShell script?

Very similar to already posted answers, but piping seems more PowerShell-like:

$PSCommandPath | Split-Path -Parent

Deleting all pending tasks in celery / rabbitmq

From the docs:

$ celery -A proj purge

from proj.celery import app
app.control.purge()

(EDIT: Updated with current method.)

Understanding string reversal via slicing

It's called Slice Notation in Python and you can read a bit more of how it works here:

Explain Python's slice notation

Twitter Bootstrap - add top space between rows

<div class="row row-padding">

simple code

'ssh' is not recognized as an internal or external command

For Windows, first install the git base from here: https://git-scm.com/downloads

Next, set the environment variable:

Press Windows+R and type sysdm.cpl
Select advance -> Environment variable
Select path-> edit the path and paste the below line:

C:\Program Files\Git\git-bash.exe

To test it, open the command window: press Windows+R, type cmd and then type ssh.

Convert a string to datetime in PowerShell

$invoice = "Jul-16"
[datetime]$newInvoice = "01-" + $invoice

$newInvoice.ToString("yyyy-MM-dd")

There you go, use a type accelerator, but also into a new var, if you want to use it elsewhere, use it like so: $newInvoice.ToString("yyyy-MM-dd")as $newInvoice will always be in the datetime format, unless you cast it as a string afterwards, but will lose the ability to perform datetime functions - adding days etc...

Write bytes to file

Try this:

private byte[] Hex2Bin(string hex) 
{
 if ((hex == null) || (hex.Length < 1)) {
  return new byte[0];
 }
 int num = hex.Length / 2;
 byte[] buffer = new byte[num];
 num *= 2;
 for (int i = 0; i < num; i++) {
  int num3 = int.Parse(hex.Substring(i, 2), NumberStyles.HexNumber);
  buffer[i / 2] = (byte) num3;
  i++;
 }
 return buffer;
}

private string Bin2Hex(byte[] binary) 
{
 StringBuilder builder = new StringBuilder();
 foreach(byte num in binary) {
  if (num > 15) {
   builder.AppendFormat("{0:X}", num);
  } else {
   builder.AppendFormat("0{0:X}", num); /////// ?? 15 ???? 0
  }
 }
 return builder.ToString();
}

Timestamp conversion in Oracle for YYYY-MM-DD HH:MM:SS format

INSERT INTO AM_PROGRAM_TUNING_EVENT_TMP1 
VALUES(TO_DATE('2012-03-28 11:10:00','yyyy/mm/dd hh24:mi:ss'));

http://www.sqlfiddle.com/#!4/22115/1

Fastest way(s) to move the cursor on a terminal command line?

To be clear, you don't want a "fast way to move the cursor on a terminal command line". What you actually want is a fast way to navigate over command line in you shell program.

Bash is very common shell, for example. It uses Readline library to implement command line input. And so to say, it is very convenient to know Readline bindings since it is used not only in bash. For example, gdb also uses Readline to process input.

In Readline documentation you can find all navigation related bindings (and more): http://www.gnu.org/software/bash/manual/bash.html#Readline-Interaction

Short copy-paste if the link above goes down:

Bare Essentials

Ctrl-b Move back one character.
Ctrl-f Move forward one character.
[DEL] or [Backspace] Delete the character to the left of the cursor.
Ctrl-d Delete the character underneath the cursor.
Ctrl-_ or C-x C-u Undo the last editing command. You can undo all the way back to an empty line.

Movement

Ctrl-a Move to the start of the line.
Ctrl-e Move to the end of the line.
Meta-f Move forward a word, where a word is composed of letters and digits.
Meta-b Move backward a word.
Ctrl-l Clear the screen, reprinting the current line at the top.

Kill and yank

Ctrl-k Kill the text from the current cursor position to the end of the line.
M-d Kill from the cursor to the end of the current word, or, if between words, to the end of the next word. Word boundaries are the same as those used by M-f.
M-[DEL] Kill from the cursor the start of the current word, or, if between words, to the start of the previous word. Word boundaries are the same as those used by M-b.
Ctrl-w Kill from the cursor to the previous whitespace. This is different than M- because the word boundaries differ.
Ctrl-y Yank the most recently killed text back into the buffer at the cursor.
M-y Rotate the kill-ring, and yank the new top. You can only do this if the prior command is C-y or M-y.

M is Meta key. For Max OS X Terminal you can enable "Use option as meta key" in Settings/Keyboard for that. For Linux its more complicated.

Update

Also note, that Readline can operate in two modes:

emacs mode (which is the default)
vi mode

To switch Bash to use vi mode:

$ set -o vi

Personaly I prefer vi mode since I use vim for text editing.

Bonus

In macOS Terminal app (and in iTerm too) you can Option-Click to move the cursor (cursor will move to clicked position). This even works inside vim.

How can I truncate a string to the first 20 words in PHP?

Try regex.

You need something that would match 20 words (or 20 word boundaries).

So (my regex is terrible so correct me if this isn't accurate):

/(\w+\b){20}/

And here are some examples of regex in php.

How to completely remove Python from a Windows machine?

Uninstall the python program using the windows GUI. Delete the containing folder e.g if it was stored in C:\python36\ make sure to delete that folder

PHP cURL HTTP CODE return 0

Like said here and below, a failed request (i.e. the server is not found) returns false, no HTTP status code, since a reply has never been received.

Call curl_error().

Insert multiple rows WITHOUT repeating the "INSERT INTO ..." part of the statement?

You could do this (ugly but it works):

INSERT INTO dbo.MyTable (ID, Name) 
select * from
(
 select 123, 'Timmy'
  union all
 select 124, 'Jonny' 
  union all
 select 125, 'Sally'
 ...
) x

How to select a range of the second row to the last row

Sub SelectAllCellsInSheet(SheetName As String)
    lastCol = Sheets(SheetName).Range("a1").End(xlToRight).Column
    Lastrow = Sheets(SheetName).Cells(1, 1).End(xlDown).Row
    Sheets(SheetName).Range("A2", Sheets(SheetName).Cells(Lastrow, lastCol)).Select
End Sub

To use with ActiveSheet:

Call SelectAllCellsInSheet(ActiveSheet.Name)

Eclipse and Windows newlines

As mentioned here and here:

Set file encoding to UTF-8 and line-endings for new files to Unix, so that text files are saved in a format that is not specific to the Windows OS and most easily shared across heterogeneous developer desktops:

Navigate to the Workspace preferences (General:Workspace)

Change the Text File Encoding to UTF-8

Change the New Text File Line Delimiter to Other and choose Unix from the pick-list

alt text

Note: to convert the line endings of an existing file, open the file in Eclipse and choose File : Convert Line Delimiters to : Unix

Tip: You can easily convert existing file by selecting then in the Package Explorer, and then going to the menu entry File : Convert Line Delimiters to : Unix

How do I set browser width and height in Selenium WebDriver?

If you are using chrome

 chrome_options = Options()
 chrome_options.add_argument("--start-maximized");
 chrome_options.add_argument("--window-position=1367,0");
 if mobile_emulation :
     chrome_options.add_experimental_option("mobileEmulation", mobile_emulation)

  self.driver = webdriver.Chrome('/path/to/chromedriver', 
                                  chrome_options = chrome_options)

This will result in the browser starting up on the second monitor without any annoying flicker or movements across the screen.

How to search through all Git and Mercurial commits in the repository for a certain string?

Any command that takes references as arguments will accept the --all option documented in the man page for git rev-list as follows:

   --all
       Pretend as if all the refs in $GIT_DIR/refs/ are listed on the
       command line as <commit>.

So for instance git log -Sstring --all will display all commits that mention string and that are accessible from a branch or from a tag (I'm assuming that your dangling commits are at least named with a tag).

Using Django time/date widgets in custom form

I find myself referencing this post a lot, and found that the documentation defines a slightly less hacky way to override default widgets.

(No need to override the ModelForm's __init__ method)

However, you still need to wire your JS and CSS appropriately as Carl mentions.

forms.py

from django import forms
from my_app.models import Product
from django.contrib.admin import widgets                                       


class ProductForm(forms.ModelForm):
    mydate = forms.DateField(widget=widgets.AdminDateWidget)
    mytime = forms.TimeField(widget=widgets.AdminTimeWidget)
    mydatetime = forms.SplitDateTimeField(widget=widgets.AdminSplitDateTime)

    class Meta:
        model = Product

Reference Field Types to find the default form fields.

How to make an autocomplete TextBox in ASP.NET?

Try this: .aspx page

<td>  
<asp:TextBox ID="TextBox1" runat="server" AutoPostBack="True"OnTextChanged="TextBox1_TextChanged"></asp:TextBox>  
<asp:AutoCompleteExtender ServiceMethod="GetCompletionList" MinimumPrefixLength="1"  
   CompletionInterval="10" EnableCaching="false" CompletionSetCount="1" TargetControlID="TextBox1"  
   ID="AutoCompleteExtender1" runat="server" FirstRowSelected="false">  
      </asp:AutoCompleteExtender>

Now To auto populate from database :

public static List<string> GetCompletionList(string prefixText, int count)  
    {  
        return AutoFillProducts(prefixText);  

    }  

    private static List<string> AutoFillProducts(string prefixText)  
    {  
        using (SqlConnection con = new SqlConnection())  
        {  
            con.ConnectionString = ConfigurationManager.ConnectionStrings["Conn"].ConnectionString;  
            using (SqlCommand com = new SqlCommand())  
            {  
                com.CommandText = "select ProductName from ProdcutMaster where " + "ProductName like @Search + '%'";  
                com.Parameters.AddWithValue("@Search", prefixText);  
                com.Connection = con;  
                con.Open();  
                List<string> countryNames = new List<string>();  
                using (SqlDataReader sdr = com.ExecuteReader())  
                {  
                    while (sdr.Read())  
                    {  
                        countryNames.Add(sdr["ProductName"].ToString());  
                    }  
                }  
                con.Close();  
                return countryNames;  
            }  
        }  
    }

Now:create a stored Procedure that fetches the Product details depending on the selected product from the Auto Complete Text Box.

Create Procedure GetProductDet  
(  
@ProductName varchar(50)    
)  
as  
begin  
Select BrandName,warranty,Price from ProdcutMaster where ProductName=@ProductName  
End

Create a function name to get product details ::

private void GetProductMasterDet(string ProductName)  
    {  
        connection();  
        com = new SqlCommand("GetProductDet", con);  
        com.CommandType = CommandType.StoredProcedure;  
        com.Parameters.AddWithValue("@ProductName", ProductName);  
        SqlDataAdapter da = new SqlDataAdapter(com);  
        DataSet ds=new DataSet();  
        da.Fill(ds);  
        DataTable dt = ds.Tables[0];  
        con.Close();  
        //Binding TextBox From dataTable  
        txtbrandName.Text =dt.Rows[0]["BrandName"].ToString();  
        txtwarranty.Text = dt.Rows[0]["warranty"].ToString();  
        txtPrice.Text = dt.Rows[0]["Price"].ToString();   
    }

Auto post back should be true

<asp:TextBox ID="TextBox1" runat="server" AutoPostBack="True" OnTextChanged="TextBox1_TextChanged"></asp:TextBox>

Now, Just call this function

protected void TextBox1_TextChanged(object sender, EventArgs e)  
  {  
      //calling method and Passing Values  
      GetProductMasterDet(TextBox1.Text);  
  }

Hex colors: Numeric representation for "transparent"?

You can use this conversion table: http://roselab.jhu.edu/~raj/MISC/hexdectxt.html

eg, if you want a transparency of 60%, you use 3C (hex equivalent).

This is usefull for IE background gradient transparency:

filter:progid:DXImageTransform.Microsoft.gradient(startColorstr=#3C545454, endColorstr=#3C545454);
-ms-filter: "progid:DXImageTransform.Microsoft.gradient(startColorstr=#3C545454, endColorstr=#3C545454)";

where startColorstr and endColorstr: 2 first characters are a hex value for transparency, and the six remaining are the hex color.

Use CSS to automatically add 'required field' asterisk to form inputs

What you need is :required selector - it will select all fields with 'required' attribute (so no need to add any additional classes). Then - style inputs according to your needs. You can use ':after' selector and add asterisk in the way suggested among other answers

Flutter does not find android sdk

Flutter is designed to use the latest Android version installed. So if you have an incomplete download of the latest Android, Flutter will try to use that.

So either complete the installation or delete the complete installation. You can find the Android versions at: /home/{user}/Android/Sdk/platforms/android-29/android.jar

The forked VM terminated without saying properly goodbye. VM crash or System.exit called

Had similar problem when running mvn command with Jacoco plugin on JDK 1.8.0_65

[INFO]
A fatal error has been detected by the Java Runtime Environment:

JRE version: Java(TM) SE Runtime Environment (8.0_65-b17) (build 1.8.0_65-b17).........
Problematic frame:
PhaseIdealLoop::build_loop_late_post(Node*)+0x144
............
............
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-surefire-plugin:2.19:test (default-test) on project 

 The forked VM terminated without properly saying goodbye. VM crash or System.exit called?

There was a bug in JDK https://bugs.openjdk.java.net/browse/JDK-8081379

And the solution was to run mvn clean install with param -XX:-UseLoopPredicate

Or just make an update to JDK (I think newer minor version works)

Timeout a command in bash without unnecessary delay

You can do this entirely with bash 4.3 and above:

_timeout() { ( set +b; sleep "$1" & "${@:2}" & wait -n; r=$?; kill -9 `jobs -p`; exit $r; ) }

Example: _timeout 5 longrunning_command args
Example: { _timeout 5 producer || echo KABOOM $?; } | consumer
Example: producer | { _timeout 5 consumer1; consumer2; }
Example: { while date; do sleep .3; done; } | _timeout 5 cat | less
Needs Bash 4.3 for wait -n
Gives 137 if the command was killed, else the return value of the command.
Works for pipes. (You do not need to go foreground here!)
Works with internal shell commands or functions, too.
Runs in a subshell, so no variable export into the current shell, sorry.

If you do not need the return code, this can be made even simpler:

_timeout() { ( set +b; sleep "$1" & "${@:2}" & wait -n; kill -9 `jobs -p`; ) }

Notes:

Strictly speaking you do not need the ; in ; ), however it makes thing more consistent to the ; }-case. And the set +b probably can be left away, too, but better safe than sorry.
Except for --forground (probably) you can implement all variants timeout supports. --preserve-status is a bit difficult, though. This is left as an exercise for the reader ;)

This recipe can be used "naturally" in the shell (as natural as for flock fd):

(
set +b
sleep 20 &
{
YOUR SHELL CODE HERE
} &
wait -n
kill `jobs -p`
)

However, as explained above, you cannot re-export environment variables into the enclosing shell this way naturally.

Edit:

Real world example: Time out __git_ps1 in case it takes too long (for things like slow SSHFS-Links):

eval "__orig$(declare -f __git_ps1)" && __git_ps1() { ( git() { _timeout 0.3 /usr/bin/git "$@"; }; _timeout 0.3 __orig__git_ps1 "$@"; ) }

Edit2: Bugfix. I noticed that exit 137 is not needed and makes _timeout unreliable at the same time.

Edit3: git is a die-hard, so it needs a double-trick to work satisfyingly.

Edit4: Forgot a _ in the first _timeout for the real world GIT example.

JavaScript or jQuery browser back button click detector

It's available in the HTML5 History API. The event is called 'popstate'

Using async/await with a forEach loop

Like @Bergi's response, but with one difference.

Promise.all rejects all promises if one gets rejected.

So, use a recursion.

const readFilesQueue = async (files, index = 0) {
    const contents = await fs.readFile(files[index], 'utf8')
    console.log(contents)

    return files.length <= index
        ? readFilesQueue(files, ++index)
        : files

}

const printFiles async = () => {
    const files = await getFilePaths();
    const printContents = await readFilesQueue(files)

    return printContents
}

printFiles()

readFilesQueue is outside of printFiles cause the side effect* introduced by console.log, it's better to mock, test, and or spy so, it's not cool to have a function that returns the content(sidenote).

Therefore, the code can simply be designed by that: three separated functions that are "pure"** and introduce no side effects, process the entire list and can easily be modified to handle failed cases.

const files = await getFilesPath()

const printFile = async (file) => {
    const content = await fs.readFile(file, 'utf8')
    console.log(content)
}

const readFiles = async = (files, index = 0) => {
    await printFile(files[index])

    return files.lengh <= index
        ? readFiles(files, ++index)
        : files
}

readFiles(files)

Future edit/current state

Node supports top-level await (this doesn't have a plugin yet, won't have and can be enabled via harmony flags), it's cool but doesn't solve one problem (strategically I work only on LTS versions). How to get the files?

Using composition. Given the code, causes to me a sensation that this is inside a module, so, should have a function to do it. If not, you should use an IIFE to wrap the role code into an async function creating simple module that's do all for you, or you can go with the right way, there is, composition.

// more complex version with IIFE to a single module
(async (files) => readFiles(await files())(getFilesPath)

Note that the name of variable changes due to semantics. You pass a functor (a function that can be invoked by another function) and recieves a pointer on memory that contains the initial block of logic of the application.

But, if's not a module and you need to export the logic?

Wrap the functions in a async function.

export const readFilesQueue = async () => {
    // ... to code goes here
}

Or change the names of variables, whatever...

* by side effect menans any colacteral effect of application that can change the statate/behaviour or introuce bugs in the application, like IO.

** by "pure", it's in apostrophe since the functions it's not pure and the code can be converged to a pure version, when there's no console output, only data manipulations.

Aside this, to be pure, you'll need to work with monads that handles the side effect, that are error prone, and treats that error separately of the application.

Getting time and date from timestamp with php

Optionally you can use database function for date/time formatting. For example in MySQL query use:

SELECT DATE_FORMAT(DATETIMEAPP,'%d-%m-%Y') AS date, DATE_FORMT(DATETIMEAPP,'%H:%i:%s') AS time FROM yourtable

I think that over databases provides solutions for date formatting too

How to run eclipse in clean mode? what happens if we do so?

For Windows users: You can do as RTA said or through command line do this: Navigate to the locaiton of the eclipse executable then run:

 eclipse.lnk -clean

First check the name of your executable using the command 'dir' on its path

How do I drag and drop files into an application?

Another common gotcha is thinking you can ignore the Form DragOver (or DragEnter) events. I typically use the Form's DragOver event to set the AllowedEffect, and then a specific control's DragDrop event to handle the dropped data.

How to change text transparency in HTML/CSS?

What about the css opacity attribute? 0 to 1 values.

But then you probably need to use a more explicit dom element than "font". For instance:

<html><body><span style=\"opacity: 0.5;\"><font color=\"black\" face=\"arial\" size=\"4\">THIS IS MY TEXT</font></span></body></html>

As an additional information I would of course suggest you use CSS declarations outside of your html elements, but as well try to use the font css style instead of the font html tag.

For cross browser css3 styles generator, have a look at http://css3please.com/

How to clear basic authentication details in chrome

For Chrome 66 I found the relevant option under:

Top right ... menu -> More Tools -> Clear Browsing Data
Click the "Advanced" tab
Check the "Passwords" box (and uncheck others you don't want cleared)
Click "Clear Data"

Using a new Incognito window is probably easier, but for those times you forget and want to clear the saved password, this does the trick without having to restart Chrome (which also works)

How do I convert a String to a BigInteger?

BigInteger has a constructor where you can pass string as an argument.

try below,

private void sum(String newNumber) {
    // BigInteger is immutable, reassign the variable:
    this.sum = this.sum.add(new BigInteger(newNumber));
}

How long to brute force a salted SHA-512 hash? (salt provided)

I want to know the time to brute force for when the password is a dictionary word and also when it is not a dictionary word.

Dictionary password

Ballpark figure: there are about 1,000,000 English words, and if a hacker can compute about 10,000 SHA-512 hashes a second (update: see comment by CodesInChaos, this estimate is very low), 1,000,000 / 10,000 = 100 seconds. So it would take just over a minute to crack a single-word dictionary password for a single user. If the user concatenates two dictionary words, you're in the area of a few days, but still very possible if the attacker is cares enough. More than that and it starts getting tough.

Random password

If the password is a truly random sequence of alpha-numeric characters, upper and lower case, then the number of possible passwords of length N is 60^N (there are 60 possible characters). We'll do the calculation the other direction this time; we'll ask: What length of password could we crack given a specific length of time? Just use this formula:

N = Log60(t * 10,000) where t is the time spent calculating hashes in seconds (again assuming 10,000 hashes a second).

1 minute:    3.2
5 minute:    3.6
30 minutes:  4.1
2 hours:     4.4
3 days:      5.2

So given a 3 days we'd be able to crack the password if it's 5 characters long.

This is all very ball-park, but you get the idea. Update: see comment below, it's actually possible to crack much longer passwords than this.

What's going on here?

Let's clear up some misconceptions:

The salt doesn't make it slower to calculate hashes, it just means they have to crack each user's password individually, and pre-computed hash tables (buzz-word: rainbow tables) are made completely useless. If you don't have a precomputed hash-table, and you're only cracking one password hash, salting doesn't make any difference.
SHA-512 isn't designed to be hard to brute-force. Better hashing algorithms like BCrypt, PBKDF2 or SCrypt can be configured to take much longer to compute, and an average computer might only be able to compute 10-20 hashes a second. Read This excellent answer about password hashing if you haven't already.
update: As written in the comment by CodesInChaos, even high entropy passwords (around 10 characters) could be bruteforced if using the right hardware to calculate SHA-512 hashes.

Notes on accepted answer:

The accepted answer as of September 2014 is incorrect and dangerously wrong:

In your case, breaking the hash algorithm is equivalent to finding a collision in the hash algorithm. That means you don't need to find the password itself (which would be a preimage attack)... Finding a collision using a birthday attack takes O(2^n/2) time, where n is the output length of the hash function in bits.

The birthday attack is completely irrelevant to cracking a given hash. And this is in fact a perfect example of a preimage attack. That formula and the next couple of paragraphs result in dangerously high and completely meaningless values for an attack time. As demonstrated above it's perfectly possible to crack salted dictionary passwords in minutes.

The low entropy of typical passwords makes it possible that there is a relatively high chance of one of your users using a password from a relatively small database of common passwords...

That's why generally hashing and salting alone is not enough, you need to install other safety mechanisms as well. You should use an artificially slowed down entropy-enducing method such as PBKDF2 described in PKCS#5...

Yes, please use an algorithm that is slow to compute, but what is "entropy-enducing"? Putting a low entropy password through a hash doesn't increase entropy. It should preserve entropy, but you can't make a rubbish password better with a hash, it doesn't work like that. A weak password put through PBKDF2 is still a weak password.

Could not load type 'XXX.Global'

Deleting the existing global.asax file and adding a new one, clears out this error. This has worked for me many times.

How do I delete specific lines in Notepad++?

You can try doing a replace of #region with \n, turning extended search mode on.

Change bootstrap navbar background color and font color

Most likely these classes are already defined by Bootstrap, make sure that your CSS file that you want to override the classes with is called AFTER the Bootstrap CSS.

<link rel="stylesheet" href="css/bootstrap.css" /> <!-- Call Bootstrap first -->
<link rel="stylesheet" href="css/bootstrap-override.css" /> <!-- Call override CSS second -->

Otherwise, you can put !important at the end of your CSS like this: color:#ffffff!important; but I would advise against using !important at all costs.

Error: org.springframework.web.HttpMediaTypeNotSupportedException: Content type 'text/plain;charset=UTF-8' not supported

For me it turned out that I had a @JsonManagedReferece in one entity without a @JsonBackReference in the other referenced entity. This caused the marshaller to throw an error.

How do I apply a style to all children of an element

Instead of the * selector you can use the :not(selector) with the > selector and set something that definitely wont be a child.

Edit: I thought it would be faster but it turns out I was wrong. Disregard.

Example:

.container > :not(marquee){
        color:red;
    }


<div class="container">
    <p></p>
    <span></span>
<div>

How to reload/refresh jQuery dataTable?

if using datatable v1.10.12 then simply calling .draw() method and passing your required draw types ie full-reset, page then you will re-draw your dt with new data

let dt = $("#my-datatable").datatable()

// do some action

dt.draw('full-reset')

for more check out datatable docs

How to connect to MySQL Database?

You must to download MySQLConnection NET from here.

Then you need add MySql.Data.DLL to MSVisualStudio like this:

Open menu project
Add
Reference
Browse to C:\Program Files (x86)\MySQL\MySQL Connector Net 8.0.12\Assemblies\v4.5.2
Add MySql.Data.dll

If you want to know more visit: enter link description here

To use in the code you must import the library:

using MySql.Data.MySqlClient;

An example with connectio to Mysql database (NO SSL MODE) by means of Click event:

using System;
using System.Windows;
using MySql.Data.MySqlClient;


namespace Deportes_WPF
{

public partial class Login : Window
{
    private MySqlConnection connection;
    private string server;
    private string database;
    private string user;
    private string password;
    private string port;
    private string connectionString;
    private string sslM;

    public Login()
    {
        InitializeComponent();

        server = "server_name";
        database = "database_name";
        user = "user_id";
        password = "password";
        port = "3306";
        sslM = "none";

        connectionString = String.Format("server={0};port={1};user id={2}; password={3}; database={4}; SslMode={5}", server, port, user, password, database, sslM);

        connection = new MySqlConnection(connectionString);
    }

    private void conexion()
    {
        try
        {
            connection.Open();

            MessageBox.Show("successful connection");

            connection.Close();
        }
        catch (MySqlException ex)
        {
            MessageBox.Show(ex.Message + connectionString);
        }
    }

    private void btn1_Click(object sender, RoutedEventArgs e)
    {
        conexion();
    }
  }

}

Port 80 is being used by SYSTEM (PID 4), what is that?

I just got this problem today, since it showed up after Norton requested reboot I blamed Norton.
But it wasn't Norton, I removed Norton, rebooted -> problem still there.

netstat -nao was showing that PID 4 owned my port 80 connection.

I then went to control panel, then "Turn Windows features on or off" then unchecked Internet Information Services.
Rebooted, the problem went away.
My xampp server is running ok now.

I don't ever remembering turning IIS on in the first place. I had been running many months before this happened. I still don't know what caused it in the first place. Maybe a previous windows updated enabled iis and my reboot turned it on, I don't know.

how to prevent css inherit

The short story is that it's not possible to do what you want here. There's no CSS rule which is to "ignore some other rule". The only way around it is to write a more-specific CSS rule for the inner elements which reverts it to how it was before, which is a pain in the butt.

Take the example below:

<div class="red"> <!-- ignore the semantics, it's an example, yo! -->
    <p class="blue">
        Blue text blue text!
        <span class="notBlue">this shouldn't be blue</span>
    </p>
</div>
<div class="green">
    <p class="blue">
        Blue text!
        <span class="notBlue">blah</span>
    </p>
</div>

There's no way to make the .notBlue class revert to the parent styling. The best you can do is this:

.red, .red .notBlue {
    color: red;
}
.green, .green .notBlue {
    color: green;
}

SQL Server Text type vs. varchar data type

TEXT is used for large pieces of string data. If the length of the field exceeed a certain threshold, the text is stored out of row.

VARCHAR is always stored in row and has a limit of 8000 characters. If you try to create a VARCHAR(x), where x > 8000, you get an error:

Server: Msg 131, Level 15, State 3, Line 1

The size () given to the type ‘varchar’ exceeds the maximum allowed for any data type (8000)

These length limitations do not concern VARCHAR(MAX) in SQL Server 2005, which may be stored out of row, just like TEXT.

Note that MAX is not a kind of constant here, VARCHAR and VARCHAR(MAX) are very different types, the latter being very close to TEXT.

In prior versions of SQL Server you could not access the TEXT directly, you only could get a TEXTPTR and use it in READTEXT and WRITETEXT functions.

In SQL Server 2005 you can directly access TEXT columns (though you still need an explicit cast to VARCHAR to assign a value for them).

TEXT is good:

If you need to store large texts in your database
If you do not search on the value of the column
If you select this column rarely and do not join on it.

VARCHAR is good:

If you store little strings
If you search on the string value
If you always select it or use it in joins.

By selecting here I mean issuing any queries that return the value of the column.

By searching here I mean issuing any queries whose result depends on the value of the TEXT or VARCHAR column. This includes using it in any JOIN or WHERE condition.

As the TEXT is stored out of row, the queries not involving the TEXT column are usually faster.

Some examples of what TEXT is good for:

Blog comments
Wiki pages
Code source

Some examples of what VARCHAR is good for:

Usernames
Page titles
Filenames

As a rule of thumb, if you ever need you text value to exceed 200 characters AND do not use join on this column, use TEXT.

Otherwise use VARCHAR.

P.S. The same applies to UNICODE enabled NTEXT and NVARCHAR as well, which you should use for examples above.

P.P.S. The same applies to VARCHAR(MAX) and NVARCHAR(MAX) that SQL Server 2005+ uses instead of TEXT and NTEXT. You'll need to enable large value types out of row for them with sp_tableoption if you want them to be always stored out of row.

As mentioned above and here, TEXT is going to be deprecated in future releases:

The text in row option will be removed in a future version of SQL Server. Avoid using this option in new development work, and plan to modify applications that currently use text in row. We recommend that you store large data by using the varchar(max), nvarchar(max), or varbinary(max) data types. To control in-row and out-of-row behavior of these data types, use the large value types out of row option.

Git diff --name-only and copy that list

The following should work fine:

git diff -z --name-only commit1 commit2 | xargs -0 -IREPLACE rsync -aR REPLACE /home/changes/protected/

To explain further:

The -z to with git diff --name-only means to output the list of files separated with NUL bytes instead of newlines, just in case your filenames have unusual characters in them.
The -0 to xargs says to interpret standard input as a NUL-separated list of parameters.
The -IREPLACE is needed since by default xargs would append the parameters to the end of the rsync command. Instead, that says to put them where the later REPLACE is. (That's a nice tip from this Server Fault answer.)
The -a parameter to rsync means to preserve permissions, ownership, etc. if possible. The -R means to use the full relative path when creating the files in the destination.

Update: if you have an old version of xargs, you'll need to use the -i option instead of -I. (The former is deprecated in later versions of findutils.)

How to access PHP session variables from jQuery function in a .js file?

If you want to maintain a clearer separation of PHP and JS (it makes syntax highlighting and checking in IDEs easier) then you can create jquery plugins for your code and then pass the $_SESSION['param'] as a variable.

So in page.php:

<script src="my_progress_bar.js"></script>
<script>
$(function () {
    var percent = <?php echo $_SESSION['percent']; ?>;
    $.my_progress_bar(percent);
});
</script>

Then in my_progress_bar.js:

(function ($) {
    $.my_progress_bar = function(percent) {
        $( "#progressbar" ).progressbar({
            value: percent
        });
    };
})(jQuery);

Integer.toString(int i) vs String.valueOf(int i)

To answer the OPs question, it's simply a helper wrapper to have the other call, and comes down to style choice and that is it. I think there's a lot of misinformation here and the best thing a Java developer can do is look at the implementation for each method, it's one or two clicks away in any IDE. You will clearly see that String.valueOf(int) is simply calling Integer.toString(int) for you.

Therefore, there is absolutely zero difference, in that they both create a char buffer, walk through the digits in the number, then copy that into a new String and return it (therefore each are creating one String object). Only difference is one extra call, which the compiler eliminates to a single call anyway.

So it matters not which you call, other than maybe code-consistency. As to the comments about nulls, it takes a primitive, therefore it can not be null! You will get a compile-time error if you don't initialize the int being passed. So there is no difference in how it handles nulls as they're non-existent in this case.

Removing duplicate characters from a string

from collections import OrderedDict
def remove_duplicates(value):
        m=list(OrderedDict.fromkeys(value))
        s=''
        for i in m:
            s+=i
        return s
print(remove_duplicates("11223445566666ababzzz@@@123#*#*"))

how to execute php code within javascript

You could use ~~http://phpjs.org/~~ http://locutus.io/php/ it ports a bunch of PHP functionality to javascript, but if it's just echos, and the script is in a php file, you could do something like this:

alert("<?php echo "asdasda";?>");

don't worry about the shifty-looking use of double-quotes, PHP will render that before the browser sees it.

as for using ajax, the easiest way is to use a library, like jQuery. With that you can do:

$.ajax({
  url: 'test.php',
  success: function(data) {
    $('.result').html(data);
  }
});

and test.php would be:

<?php 
  echo 'asdasda';
?>

it would write the contents of test.php to whatever element has the result class.

What issues should be considered when overriding equals and hashCode in Java?

equals() method is used to determine the equality of two objects.

as int value of 10 is always equal to 10. But this equals() method is about equality of two objects. When we say object, it will have properties. To decide about equality those properties are considered. It is not necessary that all properties must be taken into account to determine the equality and with respect to the class definition and context it can be decided. Then the equals() method can be overridden.

we should always override hashCode() method whenever we override equals() method. If not, what will happen? If we use hashtables in our application, it will not behave as expected. As the hashCode is used in determining the equality of values stored, it will not return the right corresponding value for a key.

Default implementation given is hashCode() method in Object class uses the internal address of the object and converts it into integer and returns it.

public class Tiger {
  private String color;
  private String stripePattern;
  private int height;

  @Override
  public boolean equals(Object object) {
    boolean result = false;
    if (object == null || object.getClass() != getClass()) {
      result = false;
    } else {
      Tiger tiger = (Tiger) object;
      if (this.color == tiger.getColor()
          && this.stripePattern == tiger.getStripePattern()) {
        result = true;
      }
    }
    return result;
  }

  // just omitted null checks
  @Override
  public int hashCode() {
    int hash = 3;
    hash = 7 * hash + this.color.hashCode();
    hash = 7 * hash + this.stripePattern.hashCode();
    return hash;
  }

  public static void main(String args[]) {
    Tiger bengalTiger1 = new Tiger("Yellow", "Dense", 3);
    Tiger bengalTiger2 = new Tiger("Yellow", "Dense", 2);
    Tiger siberianTiger = new Tiger("White", "Sparse", 4);
    System.out.println("bengalTiger1 and bengalTiger2: "
        + bengalTiger1.equals(bengalTiger2));
    System.out.println("bengalTiger1 and siberianTiger: "
        + bengalTiger1.equals(siberianTiger));

    System.out.println("bengalTiger1 hashCode: " + bengalTiger1.hashCode());
    System.out.println("bengalTiger2 hashCode: " + bengalTiger2.hashCode());
    System.out.println("siberianTiger hashCode: "
        + siberianTiger.hashCode());
  }

  public String getColor() {
    return color;
  }

  public String getStripePattern() {
    return stripePattern;
  }

  public Tiger(String color, String stripePattern, int height) {
    this.color = color;
    this.stripePattern = stripePattern;
    this.height = height;

  }
}

Example Code Output:

bengalTiger1 and bengalTiger2: true 
bengalTiger1 and siberianTiger: false 
bengalTiger1 hashCode: 1398212510 
bengalTiger2 hashCode: 1398212510 
siberianTiger hashCode: –1227465966

Clicking HTML 5 Video element to play, pause video, breaks play button

Following up on ios-lizard's idea:

I found out that the controls on the video are about 35 pixels. This is what I did:

$(this).on("click", function(event) {
    console.log("clicked");
    var offset = $(this).offset();
    var height = $(this).height();
    var y = (event.pageY - offset.top - height) * -1;
    if (y > 35) {
        this.paused ? this.play() : this.pause();
    }
});

Basically, it finds the position of the click relative to the element. I multiplied it by -1 to make it positive. If the value was greater than 35 (the height of the controls) that means that the user click somewhere else than the controls Therefore we pause or play the video.

how to get value of selected item in autocomplete

$(document).ready(function () {
    $('#tags').on('change', function () {
        $('#tagsname').html('You selected: ' + this.value);
    }).change();
    $('#tags').on('blur', function (e, ui) {
        $('#tagsname').html('You selected: ' + ui.item.value);
    });
});

How to use document.getElementByName and getElementByTag?

It's getElementsByName() and getElementsByTagName() - note the "s" in "Elements", indicating that both functions return a list of elements, i.e., a NodeList, which you will access like an array. Note that the second function ends with "TagName" not "Tag".

Even if the function only returns one element it will still be in a NodeList of length one. So:

var els = document.getElementsByName('frmMain');
// els.length will be the number of elements returned
// els[0] will be the first element returned
// els[1] the second, etc.

Assuming your form is the first (or only) form on the page you can do this:

document.getElementsByName('frmMain')[0].elements
document.getElementsByTagName('table')[0].elements

jquery datatables hide column

You can define this during datatable initialization

"aoColumns": [{"bVisible": false},null,null,null]

How to do a Jquery Callback after form submit?

$("#formid").ajaxForm({ success: function(){ //to do after submit } });

Why does the preflight OPTIONS request of an authenticated CORS request work in Chrome but not Firefox?

Why does it work in Chrome and not Firefox?

The W3 spec for CORS preflight requests clearly states that user credentials should be excluded. There is a bug in Chrome and WebKit where OPTIONS requests returning a status of 401 still send the subsequent request.

Firefox has a related bug filed that ends with a link to the W3 public webapps mailing list asking for the CORS spec to be changed to allow authentication headers to be sent on the OPTIONS request at the benefit of IIS users. Basically, they are waiting for those servers to be obsoleted.

How can I get the OPTIONS request to send and respond consistently?

Simply have the server (API in this example) respond to OPTIONS requests without requiring authentication.

Kinvey did a good job expanding on this while also linking to an issue of the Twitter API outlining the catch-22 problem of this exact scenario interestingly a couple weeks before any of the browser issues were filed.

Cannot execute RUN mkdir in a Dockerfile

The problem is that /var/www doesn't exist either, and mkdir isn't recursive by default -- it expects the immediate parent directory to exist.

Use:

mkdir -p /var/www/app

...or install a package that creates a /var/www prior to reaching this point in your Dockerfile.

find difference between two text files with one item per line

A tried a slight variation on Luca's answer and it worked for me.

diff file1 file2 | grep ">" | sed 's/^> //g' > diff_file

Note that the searched pattern in sed is a > followed by a space.

Execute another jar in a Java program

If I understand correctly it appears you want to run the jars in a separate process from inside your java GUI application.

To do this you can use:

// Run a java app in a separate system process
Process proc = Runtime.getRuntime().exec("java -jar A.jar");
// Then retreive the process output
InputStream in = proc.getInputStream();
InputStream err = proc.getErrorStream();

Its always good practice to buffer the output of the process.

Why use sys.path.append(path) instead of sys.path.insert(1, path)?

If you really need to use sys.path.insert, consider leaving sys.path[0] as it is:

sys.path.insert(1, path_to_dev_pyworkbooks)

This could be important since 3rd party code may rely on sys.path documentation conformance:

As initialized upon program startup, the first item of this list, path[0], is the directory containing the script that was used to invoke the Python interpreter.

Print array elements on separate lines in Bash?

Using for:

for each in "${alpha[@]}"
do
  echo "$each"
done

Using history; note this will fail if your values contain !:

history -p "${alpha[@]}"

Using basename; note this will fail if your values contain /:

basename -a "${alpha[@]}"

Using shuf; note that results might not come out in order:

shuf -e "${alpha[@]}"

How to find the path of Flutter SDK

If you simply moved the folder with flutter binary executable as I did, then I suggest following:

check your echo $PATH to point to the correct folder. Use export PATH="$PATH:$HOME/flutter/bin" or whatever you need (and you can also include this into your ~/.bashrc or ~/.zshrc). Use source ~/.bashrc to update it without exiting the current terminal window
Check your Android Studio (v3.6) Flutter SDK path to point to the right folder
flutter clean will clean the build/ folder with old paths
flutter doctor just to make sure everything is installed in the OS correctly

after that you should be able to flutter run which will build a new app.

java.lang.NoClassDefFoundError: com/sun/mail/util/MailLogger for JUnit test case for Java mail

com.sun.mail.util.MailLogger is part of JavaMail API. It is already included in EE environment (that's why you can use it on your live server), but it is not included in SE environment.

Oracle docs:

The JavaMail API is available as an optional package for use with Java SE platform and is also included in the Java EE platform.

99% that you run your tests in SE environment which means what you have to bother about adding it manually to your classpath when running tests.

If you're using maven add the following dependency (you might want to change version):

<dependency>
    <groupId>com.sun.mail</groupId>
    <artifactId>javax.mail</artifactId>
    <version>1.6.0</version>
</dependency>

Return from a promise then()

What I have done here is that I have returned a promise from the justTesting function. You can then get the result when the function is resolved.

// new answer

function justTesting() {
  return new Promise((resolve, reject) => {
    if (true) {
      return resolve("testing");
    } else {
      return reject("promise failed");
   }
 });
}

justTesting()
  .then(res => {
     let test = res;
     // do something with the output :)
  })
  .catch(err => {
    console.log(err);
  });

Hope this helps!

// old answer

function justTesting() {
  return promise.then(function(output) {
    return output + 1;
  });
}

justTesting().then((res) => {
     var test = res;
    // do something with the output :)
    }

Reading a file line by line in Go

bufio.Reader.ReadLine() works well. But if you want to read each line by a string, try to use ReadString('\n'). It doesn't need to reinvent the wheel.

jQuery UI Dialog Box - does not open after being closed

I had the same problem with jquery-ui overlay dialog box - it would work only once and then stop unless i reload the page. I found the answer in one of their examples -
Multiple overlays on a same page
flowplayer_tools_multiple_open_close
- who would have though, right?? :-) -

the important setting appeared to be

oneInstance: false

so, now i have it like this -

$(document).ready(function() {

 var overlays = null;

 overlays = jQuery("a[rel]");

 for (var n = 0; n < overlays.length; n++) {

    $(overlays[n]).overlay({
        oneInstance: false, 
        mask: '#669966',
        effect: 'apple',
        onBeforeLoad: function() {
            overlay_before_load(this);
        }
    });

  }

}

and everything works just fine

hope this helps somebody

Programs & Examples On #Key events

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Failed to load resource: the server responded with a status of 404 (Not Found) css

Create two blank lines in Markdown

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Update the pom.xml as -

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Trigger 404 in Spring-MVC controller?

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Creating executable files in Linux

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Linker Error C++ "undefined reference "

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What is Parse/parsing?

How to create a timer using tkinter?

How do you print in a Go test using the "testing" package?

How do I change a TCP socket to be non-blocking?

Java 256-bit AES Password-Based Encryption

Consider using the Spring Security Crypto Module

Example usage

Problems after upgrading to Xcode 10: Build input file cannot be found

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PHP prepend leading zero before single digit number, on-the-fly

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How to use a calculated column to calculate another column in the same view

Now() function with time trim

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How to use ArrayList's get() method

How to calculate DATE Difference in PostgreSQL?

Reverting to a previous revision using TortoiseSVN

Login credentials not working with Gmail SMTP

lists and arrays in VBA

asp.net validation to make sure textbox has integer values

Android XXHDPI resources

Class vs. static method in JavaScript

How to JSON serialize sets?

Update the `pom.xml` as -