Reset par to the default values at startup

Use below script to get back to normal 1 plot:

par(mfrow = c(1,1))

Executing <script> injected by innerHTML after AJAX call

This 'just works' for me using jQuery, provided you don't try to append a subset the XHR-returned HTML to the document. (See this bug report showing the problem with jQuery.)

Here is an example showing it working:

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> 
<html lang="en"> 
<head> 
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> 
    <title>test_1.4</title> 
    <script type="text/javascript" charset="utf-8" src="jquery.1.4.2.js"></script> 
    <script type="text/javascript" charset="utf-8"> 
        var snippet = "<div><span id='a'>JS did not run<\/span><script type='text/javascript'>" +
        "$('#a').html('Hooray! JS ran!');" +
        "<\/script><\/div>";
        $(function(){
            $('#replaceable').replaceWith($(snippet));
        });
    </script> 
</head> 
<body> 
    <div id="replaceable">I'm going away.</div> 
</body> 
</html>

Here is the equivalent of the above: http://jsfiddle.net/2CTLH/

Server cannot set status after HTTP headers have been sent IIS7.5

You are actually trying to redirect a page which has some response to throw. So first you keep the information you have throw in a buffer using response.buffer = true in beginning of the page and then flush it when required using response.flush this error will get fixed

Visual Studio displaying errors even if projects build

I solved this problem by deleting the temporary files of Microsoft .NET framework. Location: C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files and C:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files

Convert Unix timestamp to a date string

date -d @1278999698 +'%Y-%m-%d %H:%M:%S' Where the number behind @ is the number in seconds

HTML5 form validation pattern alphanumeric with spaces?

Use this code to ensure the user doesn't just enter spaces but a valid name:

pattern="[a-zA-Z][a-zA-Z0-9\s]*"

What is the difference between And and AndAlso in VB.NET?

Just for all those people who say side effects are evil: a place where having two side effects in one condition is good would be reading two file objects in tandem.

While File1.Seek_Next_Row() And File2.Seek_Next_Row()
    Str1 = File1.GetRow()
    Str2 = File2.GetRow()
End While

Using the And ensures that a row is consumed every time the condition is checked. Whereas AndAlso might read the last line of File1 and leave File2 without a consumed line.

Of course the code above wouldn't work, but I use side effects like this all the time and wouldn't consider it "bad" or "evil" code as some would lead you to believe. It's easy to read and efficient.

Gnuplot line types

Until version 4.6

The dash type of a linestyle is given by the linetype, which does also select the line color unless you explicitely set an other one with linecolor.

However, the support for dashed lines depends on the selected terminal:

Some terminals don't support dashed lines, like png (uses libgd)
Other terminals, like pngcairo, support dashed lines, but it is disables by default. To enable it, use set termoption dashed, or set terminal pngcairo dashed ....
The exact dash patterns differ between terminals. To see the defined linetype, use the test command:

Running

set terminal pngcairo dashed
set output 'test.png'
test
set output

gives:

enter image description here

whereas, the postscript terminal shows different dash patterns:

set terminal postscript eps color colortext
set output 'test.eps'
test
set output

enter image description here

Version 5.0

Starting with version 5.0 the following changes related to linetypes, dash patterns and line colors are introduced:

A new dashtype parameter was introduced:

To get the predefined dash patterns, use e.g.
```
plot x dashtype 2
```
You can also specify custom dash patterns like
```
plot x dashtype (3,5,10,5),\
     2*x dashtype '.-_'
```
The terminal options dashed and solid are ignored. By default all lines are solid. To change them to dashed, use e.g.
```
set for [i=1:8] linetype i dashtype i
```
The default set of line colors was changed. You can select between three different color sets with set colorsequence default|podo|classic:

enter image description here

HashMap - getting First Key value

You can try this:

 Map<String,String> map = new HashMap<>();
 Map.Entry<String,String> entry = map.entrySet().iterator().next();
 String key = entry.getKey();
 String value = entry.getValue();

Keep in mind, HashMap does not guarantee the insertion order. Use a LinkedHashMap to keep the order intact.

Eg:

 Map<String,String> map = new LinkedHashMap<>();
 map.put("Active","33");
 map.put("Renewals Completed","3");
 map.put("Application","15");
 Map.Entry<String,String> entry = map.entrySet().iterator().next();
 String key= entry.getKey();
 String value=entry.getValue();
 System.out.println(key);
 System.out.println(value);

Output:

 Active
 33

Using {% url ??? %} in django templates

I run into same problem.

What I found from documentation, we should use namedspace.

in your case {% url login:login_view %}

Angular 2 Routing run in new tab

Try this please, <a target="_blank" routerLink="/Page2">

Update1: Custom directives to the rescue! Full code is here: https://github.com/pokearound/angular2-olnw

import { Directive, ElementRef, HostListener, Input, Inject } from '@angular/core';

@Directive({ selector: '[olinw007]' })
export class OpenLinkInNewWindowDirective {
    //@Input('olinwLink') link: string; //intro a new attribute, if independent from routerLink
    @Input('routerLink') link: string;
    constructor(private el: ElementRef, @Inject(Window) private win:Window) {
    }
    @HostListener('mousedown') onMouseEnter() {
        this.win.open(this.link || 'main/default');
    }
}

Notice, Window is provided and OpenLinkInNewWindowDirective declared below:

import { AppAboutComponent } from './app.about.component';
import { AppDefaultComponent } from './app.default.component';
import { PageNotFoundComponent } from './app.pnf.component';
import { OpenLinkInNewWindowDirective } from './olinw.directive';
import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { FormsModule } from '@angular/forms';
import { HttpModule } from '@angular/http';
import { RouterModule, Routes } from '@angular/router';

import { AppComponent } from './app.component';


const appRoutes: Routes = [
  { path: '', pathMatch: 'full', component: AppDefaultComponent },
  { path: 'home', component: AppComponent },
  { path: 'about', component: AppAboutComponent },
  { path: '**', component: PageNotFoundComponent }
];

@NgModule({
  declarations: [
    AppComponent, AppAboutComponent, AppDefaultComponent, PageNotFoundComponent, OpenLinkInNewWindowDirective
  ],
  imports: [
    BrowserModule,
    FormsModule,
    HttpModule,
    RouterModule.forRoot(appRoutes)
  ],
  providers: [{ provide: Window, useValue: window }],
  bootstrap: [AppComponent]
})
export class AppModule { }

First link opens in new Window, second one will not:

<h1>
    {{title}}
    <ul>
        <li><a routerLink="/main/home" routerLinkActive="active" olinw007> OLNW</a></li>
        <li><a routerLink="/main/home" routerLinkActive="active"> OLNW - NOT</a></li>
    </ul>
    <div style="background-color:#eee;">
        <router-outlet></router-outlet>
    </div>
</h1>

Tada! ..and you are welcome =)

Update2: As of v2.4.10 <a target="_blank" routerLink="/Page2"> works

Remove padding or margins from Google Charts

There's a theme available specifically for this

options: {
  theme: 'maximized'
}

from the Google chart docs:

Currently only one theme is available:

'maximized' - Maximizes the area of the chart, and draws the legend and all of the labels inside the chart area. Sets the following options:

chartArea: {width: '100%', height: '100%'},
legend: {position: 'in'},
titlePosition: 'in', axisTitlesPosition: 'in',
hAxis: {textPosition: 'in'}, vAxis: {textPosition: 'in'}

How to add "class" to host element?

This way you don't need to add the CSS outside of the component:

@Component({
   selector: 'body',
   template: 'app-element',
   // prefer decorators (see below)
   // host:     {'[class.someClass]':'someField'}
})
export class App implements OnInit {
  constructor(private cdRef:ChangeDetectorRef) {}
  
  someField: boolean = false;
  // alternatively also the host parameter in the @Component()` decorator can be used
  @HostBinding('class.someClass') someField: boolean = false;

  ngOnInit() {
    this.someField = true; // set class `someClass` on `<body>`
    //this.cdRef.detectChanges(); 
  }
}

Plunker example

This CSS is defined inside the component and the selector is only applied if the class someClass is set on the host element (from outside):

:host(.someClass) {
  background-color: red;
}

open cv error: (-215) scn == 3 || scn == 4 in function cvtColor

img = cv2.imread('2015-05-27-191152.jpg',0)

The above line of code reads your image in grayscale color model, because of the 0 appended at the end. And if you again try to convert an already gray image to gray image it will show that error.

So either use above style or try undermentioned code:

img = cv2.imread('2015-05-27-191152.jpg')
gray_img = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)

Difference between "read commited" and "repeatable read"

Old question which has an accepted answer already, but I like to think of these two isolation levels in terms of how they change the locking behavior in SQL Server. This might be helpful for those who are debugging deadlocks like I was.

READ COMMITTED (default)

Shared locks are taken in the SELECT and then released when the SELECT statement completes. This is how the system can guarantee that there are no dirty reads of uncommitted data. Other transactions can still change the underlying rows after your SELECT completes and before your transaction completes.

REPEATABLE READ

Shared locks are taken in the SELECT and then released only after the transaction completes. This is how the system can guarantee that the values you read will not change during the transaction (because they remain locked until the transaction finishes).

More elegant way of declaring multiple variables at the same time

In your case, I would use YAML .

That is an elegant and professional standard for dealing with multiple parameters. The values are loaded from a separate file. You can see some info in this link:

https://keleshev.com/yaml-quick-introduction

But it is easier to Google it, as it is a standard, there are hundreds of info about it, you can find what best fits to your understanding. ;)

Best regards.

Encrypt Password in Configuration Files?

See what is available in Jetty for storing password (or hashes) in configuration files, and consider if the OBF encoding might be useful for you. Then see in the source how it is done.

http://www.eclipse.org/jetty/documentation/current/configuring-security-secure-passwords.html

How can I properly use a PDO object for a parameterized SELECT query

You can use the bindParam or bindValue methods to help prepare your statement. It makes things more clear on first sight instead of doing $check->execute(array(':name' => $name)); Especially if you are binding multiple values/variables.

Check the clear, easy to read example below:

$q = $db->prepare("SELECT id FROM table WHERE forename = :forename and surname = :surname LIMIT 1");
$q->bindValue(':forename', 'Joe');
$q->bindValue(':surname',  'Bloggs');
$q->execute();

if ($q->rowCount() > 0){
    $check = $q->fetch(PDO::FETCH_ASSOC);
    $row_id = $check['id'];
    // do something
}

If you are expecting multiple rows remove the LIMIT 1 and change the fetch method into fetchAll:

$q = $db->prepare("SELECT id FROM table WHERE forename = :forename and surname = :surname");// removed limit 1
$q->bindValue(':forename', 'Joe');
$q->bindValue(':surname',  'Bloggs');
$q->execute();

if ($q->rowCount() > 0){
    $check = $q->fetchAll(PDO::FETCH_ASSOC);
    //$check will now hold an array of returned rows. 
    //let's say we need the second result, i.e. index of 1
    $row_id = $check[1]['id']; 
    // do something
}

Duplicate ID, tag null, or parent id with another fragment for com.google.android.gms.maps.MapFragment

Declare SupportMapFragment object globally

    private SupportMapFragment mapFragment;

In onCreateView() method put below code

mapFragment = (SupportMapFragment) getChildFragmentManager()
            .findFragmentById(R.id.map);
 mapFragment.getMapAsync(this);

In onDestroyView() put below code

@Override
public void onDestroyView() {
   super.onDestroyView();

    if (mapFragment != null)
        getFragmentManager().beginTransaction().remove(mapFragment).commit();
}

In your xml file put below code

 <fragment
    android:id="@+id/map"
    android:name="com.abc.Driver.fragment.FragmentHome"
    class="com.google.android.gms.maps.SupportMapFragment"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    />

Above code solved my problem and it's working fine

Gem Command not found

The following command installs ruby gem for ubuntu:

apt-get install libgemplugin-ruby

I did it after ruby was installed.

CSS: Position text in the middle of the page

Try this CSS:

h1 {
    left: 0;
    line-height: 200px;
    margin-top: -100px;
    position: absolute;
    text-align: center;
    top: 50%;
    width: 100%;
}

jsFiddle: http://jsfiddle.net/wprw3/

Cannot assign requested address - possible causes?

Maybe SO_REUSEADDR helps here? http://www.unixguide.net/network/socketfaq/4.5.shtml

Coerce multiple columns to factors at once

Choose some columns to coerce to factors:

cols <- c("A", "C", "D", "H")

Use lapply() to coerce and replace the chosen columns:

data[cols] <- lapply(data[cols], factor)  ## as.factor() could also be used

Check the result:

sapply(data, class)
#        A         B         C         D         E         F         G 
# "factor" "integer"  "factor"  "factor" "integer" "integer" "integer" 
#        H         I         J 
# "factor" "integer" "integer"

Sort an Array by keys based on another Array?

A bit late, but I couldn't find the way I implemented it, this version needs closure, php>=5.3, but could be altered not to:

$customer['address'] = '123 fake st';
$customer['name'] = 'Tim';
$customer['dob'] = '12/08/1986';
$customer['dontSortMe'] = 'this value doesnt need to be sorted';

$order = array('name', 'dob', 'address');

$keys= array_flip($order);
uksort($customer, function($a, $b)use($keys){
    return $keys[$a] - $keys[$b];
});
print_r($customer);

Of course 'dontSortMe' needs to be sorted out, and may appear first in the example

"The Controls collection cannot be modified because the control contains code blocks"

Keep the java script code inside the body tag

<body> 
   <script type="text/javascript">
   </script>
</body>

How to style the parent element when hovering a child element?

A simple jquery solution for those who don't need a pure css solution:

_x000D_

    $(".letter").hover(function() {_x000D_
      $(this).closest("#word").toggleClass("hovered")_x000D_
    });

_x000D_

.hovered {_x000D_
  background-color: lightblue;_x000D_
}_x000D_
_x000D_
.letter {_x000D_
  margin: 20px;_x000D_
  background: lightgray;_x000D_
}_x000D_
_x000D_
.letter:hover {_x000D_
  background: grey;_x000D_
}

_x000D_

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>_x000D_
<div id="word">_x000D_
  <div class="letter">T</div>_x000D_
  <div class="letter">E</div>_x000D_
  <div class="letter">S</div>_x000D_
  <div class="letter">T</div>_x000D_
</div>

_x000D_

highlight the navigation menu for the current page

JavaScript:

<script type="text/javascript">
    $(function() { 
        var url = window.location;
        $('ul.nav a').filter(function() {
            return this.href == url;
        }).parent().parent().parent().addClass('active');
    });   
</script>

CSS:

.active{
    color: #fff;
    background-color: #080808;
}

HTML:

<ul class="nav navbar-nav">
                        <li class="dropdown">
                            <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="true"><i class="glyphicon glyphicon-user icon-white"></i> MY ACCOUNT <span class="caret"></span></a>
                            <ul class="dropdown-menu" role="menu">
                                <li>
                                    <?php echo anchor('myaccount', 'HOME', 'title="HOME"'); ?>
                                </li>
                                <li>
                                    <?php echo anchor('myaccount/credithistory', 'CREDIT HISTORY', 'title="CREDIT HISTORY"'); ?>
                                </li>
                          </ul>
                     </li>
</ul>

Search and get a line in Python

items=re.findall("token.*$",s,re.MULTILINE)
>>> for x in items:

you can also get the line if there are other characters before token

items=re.findall("^.*token.*$",s,re.MULTILINE)

The above works like grep token on unix and keyword 'in' or .contains in python and C#

s='''
qwertyuiop
asdfghjkl

zxcvbnm
token qwerty

asdfghjklñ
'''

http://pythex.org/ matches the following 2 lines

....
....
token qwerty

MemoryStream - Cannot access a closed Stream

Since .net45 you can use the LeaveOpen constructor argument of StreamWriter and still use the using statement. Example:

using (var ms = new MemoryStream())
{
    using (var sw = new StreamWriter(ms, Encoding.UTF8, 1024, true))
    {
        sw.WriteLine("data");
        sw.WriteLine("data 2");    
    }

    ms.Position = 0;
    using (var sr = new StreamReader(ms))
    {
        Console.WriteLine(sr.ReadToEnd());
    }
}

How do you change Background for a Button MouseOver in WPF?

All of the answers so far involve completely replacing the default button behavior with something else. However, IMHO it is useful and important to understand that it's possible to change just the part you care about, by editing the existing, default template for a XAML element.

In the case of dealing with the hover effect on a WPF button, the change in appearance in a WPF Button element is caused by a Trigger in the default style for the Button, which is based on the IsMouseOver property and sets the Background and BorderBrush properties of the top-level Border element in the control template. The Button element's background is underneath the Border element's background, so changing the Button.Background property doesn't prevent the hover effect from being seen.

With some effort, you could override this behavior with your own setter, but because the element you need to affect is in the template and not directly accessible in your own XAML, that approach would be difficult and IMHO overly complex.

Another option would be to make use the graphic as the Content for the Button rather than the Background. If you need additional content over the graphic, you can combine them with a Grid as the top-level object in the content.

However, if you literally just want to disable the hover effect entirely (rather than just hiding it), you can use the Visual Studio XAML Designer:

While editing your XAML, select the "Design" tab.
In the "Design" tab, find the button for which you want to disable the effect.
Right-click that button, and choose "Edit Template/Edit a Copy...". Select in the prompt you get where you want the new template resource to be placed. This will appear to do nothing, but in fact the Designer will have added new resources where you told it, and changed your button element to reference the style that uses those resources as the button template.
Now, you can go edit that style. The easiest thing is to delete or comment-out (e.g. Ctrl+E, C) the <Trigger Property="IsMouseOver" Value="true">...</Trigger> element. Of course, you can make any change to the template you want at that point.

When you're done, the button style will look something like this:

<p:Style x:Key="FocusVisual">
  <Setter Property="Control.Template">
    <Setter.Value>
      <ControlTemplate>
        <Rectangle Margin="2" SnapsToDevicePixels="true" Stroke="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}" StrokeThickness="1" StrokeDashArray="1 2"/>
      </ControlTemplate>
    </Setter.Value>
  </Setter>
</p:Style>
<SolidColorBrush x:Key="Button.Static.Background" Color="#FFDDDDDD"/>
<SolidColorBrush x:Key="Button.Static.Border" Color="#FF707070"/>
<SolidColorBrush x:Key="Button.MouseOver.Background" Color="#FFBEE6FD"/>
<SolidColorBrush x:Key="Button.MouseOver.Border" Color="#FF3C7FB1"/>
<SolidColorBrush x:Key="Button.Pressed.Background" Color="#FFC4E5F6"/>
<SolidColorBrush x:Key="Button.Pressed.Border" Color="#FF2C628B"/>
<SolidColorBrush x:Key="Button.Disabled.Background" Color="#FFF4F4F4"/>
<SolidColorBrush x:Key="Button.Disabled.Border" Color="#FFADB2B5"/>
<SolidColorBrush x:Key="Button.Disabled.Foreground" Color="#FF838383"/>
<p:Style x:Key="ButtonStyle1" TargetType="{x:Type Button}">
  <Setter Property="FocusVisualStyle" Value="{StaticResource FocusVisual}"/>
  <Setter Property="Background" Value="{StaticResource Button.Static.Background}"/>
  <Setter Property="BorderBrush" Value="{StaticResource Button.Static.Border}"/>
  <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
  <Setter Property="BorderThickness" Value="1"/>
  <Setter Property="HorizontalContentAlignment" Value="Center"/>
  <Setter Property="VerticalContentAlignment" Value="Center"/>
  <Setter Property="Padding" Value="1"/>
  <Setter Property="Template">
    <Setter.Value>
      <ControlTemplate TargetType="{x:Type Button}">
        <Border x:Name="border" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" SnapsToDevicePixels="true">
          <ContentPresenter x:Name="contentPresenter" Focusable="False" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Margin="{TemplateBinding Padding}" RecognizesAccessKey="True" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
        </Border>
        <ControlTemplate.Triggers>
          <Trigger Property="IsDefaulted" Value="true">
            <Setter Property="BorderBrush" TargetName="border" Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}"/>
          </Trigger>
          <!--<Trigger Property="IsMouseOver" Value="true">
            <Setter Property="Background" TargetName="border" Value="{StaticResource Button.MouseOver.Background}"/>
            <Setter Property="BorderBrush" TargetName="border" Value="{StaticResource Button.MouseOver.Border}"/>
          </Trigger>-->
          <Trigger Property="IsPressed" Value="true">
            <Setter Property="Background" TargetName="border" Value="{StaticResource Button.Pressed.Background}"/>
            <Setter Property="BorderBrush" TargetName="border" Value="{StaticResource Button.Pressed.Border}"/>
          </Trigger>
          <Trigger Property="IsEnabled" Value="false">
            <Setter Property="Background" TargetName="border" Value="{StaticResource Button.Disabled.Background}"/>
            <Setter Property="BorderBrush" TargetName="border" Value="{StaticResource Button.Disabled.Border}"/>
            <Setter Property="TextElement.Foreground" TargetName="contentPresenter" Value="{StaticResource Button.Disabled.Foreground}"/>
          </Trigger>
        </ControlTemplate.Triggers>
      </ControlTemplate>
    </Setter.Value>
  </Setter>
</p:Style>

(Note: you can omit the p: XML namespace qualifications in the actual code…I provide them here only because the Stack Overflow XML code formatter gets confused by <Style/> elements that don't have a fully-qualified name with XML namespace.)

If you want to apply the same style to other buttons, you can just right-click them and choose "Edit Template/Apply Resource" and select the style you just added for the first button. You can even make that style the default style for all buttons, using the normal techniques for applying a default style to elements in XAML.

Why does 'git commit' not save my changes?

I had a very similar issue with the same error message. "Changes not staged for commit", yet when I do a diff it shows differences. I finally figured out that a while back I had changed a directories case. ex. "PostgeSQL" to "postgresql". As I remember now sometimes git will leave a file or two behind in the old case directory. Then you will commit a new version to the new case.

Thus git doesn't know which one to rely on. So to resolve it, I had to go onto the github's website. Then you're able to view both cases. And you must delete all the files in the incorrect cased directory. Be sure that you have the correct version saved off or in the correct cased directory.

Once you have deleted all the files in the old case directory, that whole directory will disappear. Then do a commit.

At this point you should be able to do a Pull on your local computer and not see the conflicts any more. Thus being able to commit again. :)

convert string array to string

I used this way to make my project faster:

RichTextBox rcbCatalyst = new RichTextBox()
{
    Lines = arrayString
};
string text = rcbCatalyst.Text;
rcbCatalyst.Dispose();

return text;

RichTextBox.Text will automatically convert your array to a multiline string!

Java: Clear the console

Since there are several answers here showing non-working code for Windows, here is a clarification:

Runtime.getRuntime().exec("cls");

This command does not work, for two reasons:

There is no executable named cls.exe or cls.com in a standard Windows installation that could be invoked via Runtime.exec, as the well-known command cls is builtin to Windows’ command line interpreter.
When launching a new process via Runtime.exec, the standard output gets redirected to a pipe which the initiating Java process can read. But when the output of the cls command gets redirected, it doesn’t clear the console.

To solve this problem, we have to invoke the command line interpreter (cmd) and tell it to execute a command (/c cls) which allows invoking builtin commands. Further we have to directly connect its output channel to the Java process’ output channel, which works starting with Java 7, using inheritIO():

import java.io.IOException;

public class CLS {
    public static void main(String... arg) throws IOException, InterruptedException {
        new ProcessBuilder("cmd", "/c", "cls").inheritIO().start().waitFor();
    }
}

Now when the Java process is connected to a console, i.e. has been started from a command line without output redirection, it will clear the console.

How can I let a user download multiple files when a button is clicked?

I fond that executing click() event on a element inside a for loop for multiple files download works only for limited number of files (10 files in my case). The only reason that would explain this behavior that made sense to me, was speed/intervals of downloads executed by click() events.

I figure out that, if I slow down execution of click() event, then I will be able to downloads all files.

This is solution that worked for me.

var urls = [
  'http://example.com/file1',
  'http://example.com/file2',
  'http://example.com/file3'
]

var interval = setInterval(download, 300, urls);

function download(urls) {
  var url = urls.pop();

  var a = document.createElement("a");
  a.setAttribute('href', url);
  a.setAttribute('download', '');
  a.setAttribute('target', '_blank');
  a.click();

  if (urls.length == 0) {
    clearInterval(interval);
  }
}

I execute download event click() every 300ms. When there is no more files to download urls.length == 0 then, I execute clearInterval on interval function to stop downloads.

Check if directory mounted with bash

How to do a FULL OUTER JOIN in MySQL?

Modified shA.t's query for more clarity:

-- t1 left join t2
SELECT t1.value, t2.value
FROM t1 LEFT JOIN t2 ON t1.value = t2.value   

    UNION ALL -- include duplicates

-- t1 right exclude join t2 (records found only in t2)
SELECT t1.value, t2.value
FROM t1 RIGHT JOIN t2 ON t1.value = t2.value
WHERE t1.value IS NULL

git: fatal: Could not read from remote repository

I had a wrong ssh private key for Bitbucket along with the right one in ssh agent.

Deleted all keys first

ssh-add -D

Then added just the right key.

ssh-add ~/.ssh/id_rsa

How to force page refreshes or reloads in jQuery?

Replace with:

$('#something').click(function() {
    location.reload();
});

What is future in Python used for and how/when to use it, and how it works

There are some great answers already, but none of them address a complete list of what the __future__ statement currently supports.

Put simply, the __future__ statement forces Python interpreters to use newer features of the language.

The features that it currently supports are the following:

`nested_scopes`

Prior to Python 2.1, the following code would raise a NameError:

def f():
    ...
    def g(value):
        ...
        return g(value-1) + 1
    ...

The from __future__ import nested_scopes directive will allow for this feature to be enabled.

`generators`

Introduced generator functions such as the one below to save state between successive function calls:

def fib():
    a, b = 0, 1
    while 1:
       yield b
       a, b = b, a+b

`division`

Classic division is used in Python 2.x versions. Meaning that some division statements return a reasonable approximation of division ("true division") and others return the floor ("floor division"). Starting in Python 3.0, true division is specified by x/y, whereas floor division is specified by x//y.

The from __future__ import division directive forces the use of Python 3.0 style division.

`absolute_import`

Allows for parenthesis to enclose multiple import statements. For example:

from Tkinter import (Tk, Frame, Button, Entry, Canvas, Text,
    LEFT, DISABLED, NORMAL, RIDGE, END)

Instead of:

from Tkinter import Tk, Frame, Button, Entry, Canvas, Text, \
    LEFT, DISABLED, NORMAL, RIDGE, END

Or:

from Tkinter import Tk, Frame, Button, Entry, Canvas, Text
from Tkinter import LEFT, DISABLED, NORMAL, RIDGE, END

`with_statement`

Adds the statement with as a keyword in Python to eliminate the need for try/finally statements. Common uses of this are when doing file I/O such as:

with open('workfile', 'r') as f:
     read_data = f.read()

print_function:

Forces the use of Python 3 parenthesis-style print() function call instead of the print MESSAGE style statement.

unicode_literals

Introduces the literal syntax for the bytes object. Meaning that statements such as bytes('Hello world', 'ascii') can be simply expressed as b'Hello world'.

`generator_stop`

Replaces the use of the StopIteration exception used inside generator functions with the RuntimeError exception.

One other use not mentioned above is that the __future__ statement also requires the use of Python 2.1+ interpreters since using an older version will throw a runtime exception.

References

Disable clipboard prompt in Excel VBA on workbook close

proposed solution edit works if you replace the row

Set rDst = ThisWorkbook.Sheets("SomeSheet").Cells("YourCell").Resize(rSrc.Rows.Count, rSrc.Columns.Count)

with

Set rDst = ThisWorkbook.Sheets("SomeSheet").Range("YourRange").Resize(rSrc.Rows.Count, rSrc.Columns.Count)

DB2 Query to retrieve all table names for a given schema

IN db2warehouse I found that "owner" doesn't exist, so I describe table syscat.systables and try using CREATOR instead and it works.

db2 "select NAME from sysibm.systables where CREATOR = '[SCHEMANAME]'and type = 'T'"

Configuration System Failed to Initialize

In my case the only solution was to add the reference to the System.Configuration in my Test project as well.

How to pass a parameter to Vue @click event handler

Just use a normal Javascript expression, no {} or anything necessary:

@click="addToCount(item.contactID)"

if you also need the event object:

@click="addToCount(item.contactID, $event)"

Does JavaScript have a built in stringbuilder class?

For those interested, here's an alternative to invoking Array.join:

var arrayOfStrings = ['foo', 'bar'];
var result = String.concat.apply(null, arrayOfStrings);
console.log(result);

The output, as expected, is the string 'foobar'. In Firefox, this approach outperforms Array.join but is outperformed by + concatenation. Since String.concat requires each segment to be specified as a separate argument, the caller is limited by any argument count limit imposed by the executing JavaScript engine. Take a look at the documentation of Function.prototype.apply() for more information.

How to pause javascript code execution for 2 seconds

Javascript is single-threaded, so by nature there should not be a sleep function because sleeping will block the thread. setTimeout is a way to get around this by posting an event to the queue to be executed later without blocking the thread. But if you want a true sleep function, you can write something like this:

function sleep(miliseconds) {
   var currentTime = new Date().getTime();

   while (currentTime + miliseconds >= new Date().getTime()) {
   }
}

Note: The above code is NOT recommended.

The service cannot accept control messages at this time

The error message could result due to the following reason:

The service associated with Credential Manager does not start.
Some files associated with the application have gone corrupt.

Please follow the steps mentioned below to resolve the issue:

Method 1:

Click on the “Start”
In the text box that reads “Search Program and Files” type “Services”
Right click on “Services” and select “Run as Administrator”
In the Services Window, look for Credential Manager Service and “Stop” it.
Restart the computer and “Start” the Credential Manager Service and set it to “Automatic”.
Restart the computer and it should work fine.

Method 2: 1. Run System File Checker. Refer to the link mentioned below for additional information: http://support.microsoft.com/kb/929833

How to update column value in laravel

Version 1:

// Update data of question values with $data from formulay
$Q1 = Question::find($id);
$Q1->fill($data);
$Q1->push();

Version 2:

$Q1 = Question::find($id);
$Q1->field = 'YOUR TEXT OR VALUE';
$Q1->save();

In case of answered question you can use them:

$page = Page::find($id);
$page2update = $page->where('image', $path);
$page2update->image = 'IMGVALUE';
$page2update->save();

How can I convert a string to upper- or lower-case with XSLT?

upper-case(string) and lower-case(string)

PHP read and write JSON from file

When you want to create json format it had to be in this format for it to read:

[ 
  {
    "":"",
    "":[
     {
       "":"",
       "":""
     }
    ]
  }
]

Attach a body onload event with JS

There are several different methods you have to use for different browsers. Libraries like jQuery give you a cross-browser interface that handles it all for you, though.

How to access to a child method from the parent in vue.js

To communicate a child component with another child component I've made a method in parent which calls a method in a child with:

this.$refs.childMethod()

And from the another child I've called the root method:

this.$root.theRootMethod()

It worked for me.

UIAlertView first deprecated IOS 9

Xcode 8 + Swift

Assuming self is a UIViewController:

func displayAlert() {
    let alert = UIAlertController(title: "Test",
                                  message: "I am a modal alert",
                                  preferredStyle: .alert)
    let defaultButton = UIAlertAction(title: "OK",
                                      style: .default) {(_) in
        // your defaultButton action goes here
    }
    
    alert.addAction(defaultButton)
    present(alert, animated: true) { 
        // completion goes here
    }
}

Is there a way to pass optional parameters to a function?

You can specify a default value for the optional argument with something that would never passed to the function and check it with the is operator:

class _NO_DEFAULT:
    def __repr__(self):return "<no default>"
_NO_DEFAULT = _NO_DEFAULT()

def func(optional= _NO_DEFAULT):
    if optional is _NO_DEFAULT:
        print("the optional argument was not passed")
    else:
        print("the optional argument was:",optional)

then as long as you do not do func(_NO_DEFAULT) you can be accurately detect whether the argument was passed or not, and unlike the accepted answer you don't have to worry about side effects of ** notation:

# these two work the same as using **
func()
func(optional=1)

# the optional argument can be positional or keyword unlike using **
func(1) 

#this correctly raises an error where as it would need to be explicitly checked when using **
func(invalid_arg=7)

Rounding a variable to two decimal places C#

You should use a form of Math.Round. Be aware that Math.Round defaults to banker's rounding (rounding to the nearest even number) unless you specify a MidpointRounding value. If you don't want to use banker's rounding, you should use Math.Round(decimal d, int decimals, MidpointRounding mode), like so:

Math.Round(pay, 2, MidpointRounding.AwayFromZero); // .005 rounds up to 0.01
Math.Round(pay, 2, MidpointRounding.ToEven);       // .005 rounds to nearest even (0.00) 
Math.Round(pay, 2);    // Defaults to MidpointRounding.ToEven

(Why does .NET use banker's rounding?)

jQuery UI " $("#datepicker").datepicker is not a function"

I struggled with a similar problem for hours. It then turned out that jQuery was included twice, once by the program that I was adding a jQuery function to and once by our in-house debugger.

How to import JsonConvert in C# application?

Or if you're using dotnet Core,

add to your .csproj file

  <ItemGroup>
    <PackageReference Include="Newtonsoft.Json" Version="9.0.1" />
  </ItemGroup>

And

dotnet restore

Using Laravel Homestead: 'no input file specified'

My problem was in the config file of the domain:

the public folder of my project was created in /home/vagrant/Code/demo/public

the config file of the domain (for me /etc/nginx/sites-available/demo.app) had configured: "/home/vagrant/Code/Laravel/public" instead of "/home/vagrant/Code/demo/public".

Now it is working perfect.

Why does this iterative list-growing code give IndexError: list assignment index out of range?

Maybe you need extend()

i=[1,3,5,7]
j=[]
j.extend(i)

Use string contains function in oracle SQL query

The answer of ADTC works fine, but I've find another solution, so I post it here if someone wants something different.

I think ADTC's solution is better, but mine's also works.

Here is the other solution I found

select p.name
from   person p
where  instr(p.name,chr(8211)) > 0; --contains the character chr(8211) 
                                    --at least 1 time

Thank you.

Is there a way to continue broken scp (secure copy) command process in Linux?

This is all you need.

 rsync -e ssh file host:/directory/.

Animate element to auto height with jQuery

You can make Liquinaut's answer responsive to window size changes by adding a callback that sets the height back to auto.

$("#first").animate({height: $("#first").get(0).scrollHeight}, 1000, function() {$("#first").css({height: "auto"});});

Setting Java heap space under Maven 2 on Windows

The environment variable to set is MAVEN_OPTS, for example MAVEN_OPTS=-Xmx1024m. The maxmem configuration in the pom only applies when you set the compiler plugin to fork javac into a new JVM. Otherwise the plugin runs inside the same VM as Maven and thus within the memory passed on the command line via the MAVEN_OPTS.

To set MAVEN_OPTS under Windows 7:

Right click on My Computer and select Properties (keyboard shortcut press Windows + Pause/Break)
Click the Advanced System Settings link located in the left navigation of System Properties to display the Advanced System Properties
Go to the Advanced tab and click the Environment Variables button located at the bottom of the Advanced System Properties configuration window
Create a New user variable, set the Variable name to MAVEN_OPTS and set the Variable value to -Xmx1024m (or more)

Open a new command window and run mvn.

How to plot a function curve in R

Here is a lattice version:

library(lattice)
eq<-function(x) {x*x}
X<-1:1000
xyplot(eq(X)~X,type="l")

Lattice output

jQuery function after .append

I ran into a similar problem recently. The solution for me was to re-create the colletion. Let me try to demonstrate:

var $element = $(selector);
$element.append(content);

// This Doesn't work, because $element still contains old structure:
$element.fooBar();    

// This should work: the collection is re-created with the new content:
$(selector).fooBar();

Hope this helps!

insert echo into the specific html element like div which has an id or class

Have you tried this?:

    $string = '';
    while($row = mysql_fetch_array($result))
    {
    //this will combine all the results into one string
    $string .= '<img src="'.$row['name'].'" />
                <div>'.$row['name'].'</div>
                <div>'.$row['title'].'</div>
                <div>'.$row['description'].'</div>
                <div>'.$row['link'].'</div><br />';

    //or this will add the individual result in an array
 /*
     $yourHtml[] = $row;
*/
    }

then you echo the $tring to the place you want it to be

<div id="place_here">
   <?php echo $string; ?>
   <?php 
     //or
    /*
      echo '<img src="'.$yourHtml[0]['name'].'" />;//change the index, or you just foreach loop it
    */
    ?>
</div>

Change selected value of kendo ui dropdownlist

It's possible to "natively" select by value:

dropdownlist.select(1);

Running Facebook application on localhost

In my case the issue revealed to be chrome blocking the CORS request from localhost:4200 to facebook api website. Running Chrome with this setting: "YOUR_PATH_TO_CHROME\Google\Chrome\Application\chrome.exe" --disable-web-security --user-data-dir="c:/chrome worked like a charm while developing. Even with no localhost added to facebook app's settings.

Chrome DevTools Devices does not detect device when plugged in

Samsung Note 8 User here - all i had to do was

Enable USB Debugging on the phone.
Install and run the "ADB and Fastboot" tool
Input command adb devices in the adb prompt.
Go to chrome://inspect/#devices and the device shows up.

After that i got a message on my phone and chrome recognized the phone.

cast_sender.js error: Failed to load resource: net::ERR_FAILED in Chrome

A simple fix for this is to install the Google Cast extension. If you don't have a Chromecast, or don't want to use the extension, no problem; just don't use the extension.

How do I keep the screen on in my App?

You need to use Power Manager to acquire a wake lock in your application.

Most probably you are interested in a FULL_WAKE_LOCK:

PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
PowerManager.WakeLock wl = pm.newWakeLock(PowerManager.FULL_WAKE_LOCK, "My Tag");
wl.acquire();
....
wl.release();

How to get Rails.logger printing to the console/stdout when running rspec?

A solution that I like, because it keeps rspec output separate from actual rails log output, is to do the following:

Open a second terminal window or tab, and arrange it so that you can see both the main terminal you're running rspec on as well as the new one.
Run a tail command in the second window so you see the rails log in the test environment. By default this can be like $ tail -f $RAILS_APP_DIR/logs/test.log or tail -f $RAILS_APP_DIR\logs\test.log for Window users
Run your rspec suites

If you are running a multi-pane terminal like iTerm, this becomes even more fun and you have rspec and the test.log output side by side.

Get the name of an object's type

Here is an implementation based on the accepted answer:

_x000D_

/**_x000D_
 * Returns the name of an object's type._x000D_
 *_x000D_
 * If the input is undefined, returns "Undefined"._x000D_
 * If the input is null, returns "Null"._x000D_
 * If the input is a boolean, returns "Boolean"._x000D_
 * If the input is a number, returns "Number"._x000D_
 * If the input is a string, returns "String"._x000D_
 * If the input is a named function or a class constructor, returns "Function"._x000D_
 * If the input is an anonymous function, returns "AnonymousFunction"._x000D_
 * If the input is an arrow function, returns "ArrowFunction"._x000D_
 * If the input is a class instance, returns "Object"._x000D_
 *_x000D_
 * @param {Object} object an object_x000D_
 * @return {String} the name of the object's class_x000D_
 * @see <a href="https://stackoverflow.com/a/332429/14731">https://stackoverflow.com/a/332429/14731</a>_x000D_
 * @see getFunctionName_x000D_
 * @see getObjectClass _x000D_
 */_x000D_
function getTypeName(object)_x000D_
{_x000D_
  const objectToString = Object.prototype.toString.call(object).slice(8, -1);_x000D_
  if (objectToString === "Function")_x000D_
  {_x000D_
    const instanceToString = object.toString();_x000D_
    if (instanceToString.indexOf(" => ") != -1)_x000D_
      return "ArrowFunction";_x000D_
    const getFunctionName = /^function ([^(]+)\(/;_x000D_
    const match = instanceToString.match(getFunctionName);_x000D_
    if (match === null)_x000D_
      return "AnonymousFunction";_x000D_
    return "Function";_x000D_
  }_x000D_
  // Built-in types (e.g. String) or class instances_x000D_
  return objectToString;_x000D_
};_x000D_
_x000D_
/**_x000D_
 * Returns the name of a function._x000D_
 *_x000D_
 * If the input is an anonymous function, returns ""._x000D_
 * If the input is an arrow function, returns "=>"._x000D_
 *_x000D_
 * @param {Function} fn a function_x000D_
 * @return {String} the name of the function_x000D_
 * @throws {TypeError} if {@code fn} is not a function_x000D_
 * @see getTypeName_x000D_
 */_x000D_
function getFunctionName(fn)_x000D_
{_x000D_
  try_x000D_
  {_x000D_
    const instanceToString = fn.toString();_x000D_
    if (instanceToString.indexOf(" => ") != -1)_x000D_
      return "=>";_x000D_
    const getFunctionName = /^function ([^(]+)\(/;_x000D_
    const match = instanceToString.match(getFunctionName);_x000D_
    if (match === null)_x000D_
    {_x000D_
      const objectToString = Object.prototype.toString.call(fn).slice(8, -1);_x000D_
      if (objectToString === "Function")_x000D_
        return "";_x000D_
      throw TypeError("object must be a Function.\n" +_x000D_
        "Actual: " + getTypeName(fn));_x000D_
    }_x000D_
    return match[1];_x000D_
  }_x000D_
  catch (e)_x000D_
  {_x000D_
    throw TypeError("object must be a Function.\n" +_x000D_
      "Actual: " + getTypeName(fn));_x000D_
  }_x000D_
};_x000D_
_x000D_
/**_x000D_
 * @param {Object} object an object_x000D_
 * @return {String} the name of the object's class_x000D_
 * @throws {TypeError} if {@code object} is not an Object_x000D_
 * @see getTypeName_x000D_
 */_x000D_
function getObjectClass(object)_x000D_
{_x000D_
  const getFunctionName = /^function ([^(]+)\(/;_x000D_
  const result = object.constructor.toString().match(getFunctionName)[1];_x000D_
  if (result === "Function")_x000D_
  {_x000D_
    throw TypeError("object must be an Object.\n" +_x000D_
      "Actual: " + getTypeName(object));_x000D_
  }_x000D_
  return result;_x000D_
};_x000D_
_x000D_
_x000D_
function UserFunction()_x000D_
{_x000D_
}_x000D_
_x000D_
function UserClass()_x000D_
{_x000D_
}_x000D_
_x000D_
let anonymousFunction = function()_x000D_
{_x000D_
};_x000D_
_x000D_
let arrowFunction = i => i + 1;_x000D_
_x000D_
console.log("getTypeName(undefined): " + getTypeName(undefined));_x000D_
console.log("getTypeName(null): " + getTypeName(null));_x000D_
console.log("getTypeName(true): " + getTypeName(true));_x000D_
console.log("getTypeName(5): " + getTypeName(5));_x000D_
console.log("getTypeName(\"text\"): " + getTypeName("text"));_x000D_
console.log("getTypeName(userFunction): " + getTypeName(UserFunction));_x000D_
console.log("getFunctionName(userFunction): " + getFunctionName(UserFunction));_x000D_
console.log("getTypeName(anonymousFunction): " + getTypeName(anonymousFunction));_x000D_
console.log("getFunctionName(anonymousFunction): " + getFunctionName(anonymousFunction));_x000D_
console.log("getTypeName(arrowFunction): " + getTypeName(arrowFunction));_x000D_
console.log("getFunctionName(arrowFunction): " + getFunctionName(arrowFunction));_x000D_
//console.log("getFunctionName(userClass): " + getFunctionName(new UserClass()));_x000D_
console.log("getTypeName(userClass): " + getTypeName(new UserClass()));_x000D_
console.log("getObjectClass(userClass): " + getObjectClass(new UserClass()));_x000D_
//console.log("getObjectClass(userFunction): " + getObjectClass(UserFunction));_x000D_
//console.log("getObjectClass(userFunction): " + getObjectClass(anonymousFunction));_x000D_
//console.log("getObjectClass(arrowFunction): " + getObjectClass(arrowFunction));_x000D_
console.log("getTypeName(nativeObject): " + getTypeName(navigator.mediaDevices.getUserMedia));_x000D_
console.log("getFunctionName(nativeObject): " + getFunctionName(navigator.mediaDevices.getUserMedia));

_x000D_

We only use the constructor property when we have no other choice.

How do you resize a form to fit its content automatically?

If you trying to fit the content according to the forms than the following will help. It helps me while I was trying to fit the content on the form to fit when ever the forms were resized.

this.contents.Size = new Size(this.ClientRectangle.Width, this.ClientRectangle.Height);

How to check if a variable is empty in python?

See also this previous answer which recommends the not keyword

How to check if a list is empty in Python?

It generalizes to more than just lists:

>>> a = ""
>>> not a
True

>>> a = []
>>> not a
True

>>> a = 0
>>> not a
True

>>> a = 0.0
>>> not a
True

>>> a = numpy.array([])
>>> not a
True

Notably, it will not work for "0" as a string because the string does in fact contain something - a character containing "0". For that you have to convert it to an int:

>>> a = "0"
>>> not a
False

>>> a = '0'
>>> not int(a)
True

Visual Studio Code - is there a Compare feature like that plugin for Notepad ++?

You can compare files from the explorer either from the working files section or the folder section. You can also trigger the global compare action from the command palette.

TypeError: module.init() takes at most 2 arguments (3 given)

Even after @Mickey Perlstein's answer and his 3 hours of detective work, it still took me a few more minutes to apply this to my own mess. In case anyone else is like me and needs a little more help, here's what was going on in my situation.

responses is a module
Response is a base class within the responses module
GeoJsonResponse is a new class derived from Response

Initial GeoJsonResponse class:

from pyexample.responses import Response

class GeoJsonResponse(Response):

    def __init__(self, geo_json_data):

Looks fine. No problems until you try to debug the thing, which is when you get a bunch of seemingly vague error messages like this:

from pyexample.responses import GeoJsonResponse ..\pyexample\responses\GeoJsonResponse.py:12: in (module) class GeoJsonResponse(Response):

E TypeError: module() takes at most 2 arguments (3 given)

=================================== ERRORS ====================================

___________________ ERROR collecting tests/test_geojson.py ____________________

test_geojson.py:2: in (module) from pyexample.responses import GeoJsonResponse ..\pyexample\responses \GeoJsonResponse.py:12: in (module)

class GeoJsonResponse(Response): E TypeError: module() takes at most 2 arguments (3 given)

ERROR: not found: \PyExample\tests\test_geojson.py::TestGeoJson::test_api_response

C:\Python37\lib\site-packages\aenum__init__.py:163

(no name 'PyExample\ tests\test_geojson.py::TestGeoJson::test_api_response' in any of [])

The errors were doing their best to point me in the right direction, and @Mickey Perlstein's answer was dead on, it just took me a minute to put it all together in my own context:

I was importing the module:

from pyexample.responses import Response

when I should have been importing the class:

from pyexample.responses.Response import Response

Hope this helps someone. (In my defense, it's still pretty early.)

Explaining the 'find -mtime' command

To find all files modified in the last 24 hours use the one below. The -1 here means changed 1 day or less ago.

find . -mtime -1 -ls

SyntaxError: Use of const in strict mode?

If this is happening in nodejs, it is due to the older version of nodejs. Update node by using,

1) Clear NPM's cache:

sudo npm cache clean -f

2) Install a little helper called 'n'

sudo npm install -g n

3) Install latest stable NodeJS version

sudo n stable

Update nodejs instructions taken from, https://stackoverflow.com/a/19584407/698072

Passing on command line arguments to runnable JAR

You can pass program arguments on the command line and get them in your Java app like this:

public static void main(String[] args) {
  String pathToXml = args[0];
....
}

Alternatively you pass a system property by changing the command line to:

java -Dpath-to-xml=enwiki-20111007-pages-articles.xml -jar wiki2txt

and your main class to:

public static void main(String[] args) {
  String pathToXml = System.getProperty("path-to-xml");
....
}

Unable to load AWS credentials from the /AwsCredentials.properties file on the classpath

Since AmazonDynamoDBClient(credentials) is deprecated i use this.

init {
        val cp= AWSStaticCredentialsProvider(BasicAWSCredentials(ACCESS_KEY, SECRET_KEY))
        val client = AmazonDynamoDBClientBuilder.standard().withCredentials(cp).withRegion(Regions.US_EAST_1).build()
        dynamoDB = DynamoDB(client)
    }

JavaScript seconds to time string with format hh:mm:ss

I saw that everybody's posting their takes on the problem despite the fact that few top answers already include all the necessary info to tailor for the specific use case.

And since I want to be hip as well - here's my unnecessary and a bit cumbersome solution, which is:

a) Readable (I hope!)
b) Easily customizable
c) Doesn't print any zeroes

drum roll

function durationToDDHHMMSSMS(durms) {
    if (!durms) return "??";

    var HHMMSSMS = new Date(durms).toISOString().substr(11, 12);
    if (!HHMMSSMS) return "??";

    var HHMMSS = HHMMSSMS.split(".")[0];
    if (!HHMMSS) return "??";

    var MS = parseInt(HHMMSSMS.split(".")[1],10);
    var split = HHMMSS.split(":");
    var SS = parseInt(split[2],10);
    var MM = parseInt(split[1],10);
    var HH = parseInt(split[0],10); 
    var DD = Math.floor(durms/(1000*60*60*24));

    var string = "";
    if (DD) string += ` ${DD}d`;
    if (HH) string += ` ${HH}h`;
    if (MM) string += ` ${MM}m`;
    if (SS) string += ` ${SS}s`;
    if (MS) string += ` ${MS}ms`;

    return string;
},

Note that this code uses ES6 template strings, I'm sure that such a smarty-pants as you are will have no difficulties replacing them with regular strings if required.

What are projection and selection?

Projection: what ever typed in select clause i.e, 'column list' or '*' or 'expressions' that becomes under projection.

*selection:*what type of conditions we are applying on that columns i.e, getting the records that comes under selection.

For example:

  SELECT empno,ename,dno,job from Emp 
     WHERE job='CLERK';

in the above query the columns "empno,ename,dno,job" those comes under projection, "where job='clerk'" comes under selection

Java enum - why use toString instead of name

A practical example when name() and toString() make sense to be different is a pattern where single-valued enum is used to define a singleton. It looks surprisingly at first but makes a lot of sense:

enum SingletonComponent {
    INSTANCE(/*..configuration...*/);

    /* ...behavior... */

    @Override
    String toString() {
      return "SingletonComponent"; // better than default "INSTANCE"
    }
}

In such case:

SingletonComponent myComponent = SingletonComponent.INSTANCE;
assertThat(myComponent.name()).isEqualTo("INSTANCE"); // blah
assertThat(myComponent.toString()).isEqualTo("SingletonComponent"); // better

java collections - keyset() vs entrySet() in map

Traversal over the large map entrySet() is much better than the keySet(). Check this tutorial how they optimise the traversal over the large object with the help of entrySet() and how it helps for performance tuning.

In a bootstrap responsive page how to center a div

I think the simplest way to accomplish the layout with bootstrap is like this:

<section>
<div class="container">
    <div class="row">
        <div align="center">
            <div style="max-width: 200px; background-color: blueviolet;">
                <div>
                    <h1 style="color: white;">Content goes here</h1>
                </div>
            </div>
        </div>
    </div>
</div>

all I did was to add layers of divs that allowed me to center the div, but since I am not using percentages, you need to specify the max-width of the div to be center.

You can use this same method to center more than one column, you just need to add more div layers:

<div class="container">
    <div class="row">
        <div align="center">
            <div style="max-width: 400px; background-color: blueviolet;">
                <div class="col-md-12 col-sm-12 col-xs-12" style="background-color: blueviolet;">
                    <div class="col-md-8 col-sm-8 col-xs-12" style="background-color: darkcyan;">
                        <h1 style="color: white;">Some content</h1>
                    </div>
                    <div class="col-md-4 col-sm-4 col-xs-12" style="background-color: blue;">
                        <p style="color: white;">More content</p>
                    </div>
                </div>
            </div>
        </div>
    </div>
</div>

Note: that I added a div with column 12 for md, sm and xs, if you don't do this the first div with background color (in this case "blueviolet") will collapse, you will be able to see the child divs, but not the background color.

How do C++ class members get initialized if I don't do it explicitly?

Uninitialized non-static members will contain random data. Actually, they will just have the value of the memory location they are assigned to.

Of course for object parameters (like string) the object's constructor could do a default initialization.

In your example:

int *ptr; // will point to a random memory location
string name; // empty string (due to string's default costructor)
string *pname; // will point to a random memory location
string &rname; // it would't compile
const string &crname; // it would't compile
int age; // random value

Unable to locate Spring NamespaceHandler for XML schema namespace [http://www.springframework.org/schema/security]

In my case, this was caused by custom manifest entries added by the maven-jar-plugin.

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-jar-plugin</artifactId>
    <version>2.6</version>
    <configuration>
        <archive>
            <index>true</index>
            <manifest>
                <addClasspath>true</addClasspath>
            </manifest>
            <manifestEntries>
                <git>${buildNumber}</git>
                <build-time>${timestamp}</build-time>
            </manifestEntries>
        </archive>
    </configuration>
</plugin>

Removing the following entries fixed the problem

<index>true</index>
<manifest>
    <addClasspath>true</addClasspath>
</manifest>

How to manually set an authenticated user in Spring Security / SpringMVC

I couldn't find any other full solutions so I thought I would post mine. This may be a bit of a hack, but it resolved the issue to the above problem:

public void login(HttpServletRequest request, String userName, String password)
{

    UsernamePasswordAuthenticationToken authRequest = new UsernamePasswordAuthenticationToken(userName, password);

    // Authenticate the user
    Authentication authentication = authenticationManager.authenticate(authRequest);
    SecurityContext securityContext = SecurityContextHolder.getContext();
    securityContext.setAuthentication(authentication);

    // Create a new session and add the security context.
    HttpSession session = request.getSession(true);
    session.setAttribute("SPRING_SECURITY_CONTEXT", securityContext);
}

Maximum concurrent connections to MySQL

As per the MySQL docs: http://dev.mysql.com/doc/refman/5.0/en/server-system-variables.html#sysvar_max_user_connections

 maximum range: 4,294,967,295  (e.g. 2**32 - 1)

You'd probably run out of memory, file handles, and network sockets, on your server long before you got anywhere close to that limit.

Call to undefined function oci_connect()

I installed WAMPServer 2.5 (32-bit) and also encountered an oci_connect error. I also had Oracle 11g client (32-bit) installed. The common fix I read in other posts was to alter the php.ini file in your C:\wamp\bin\php\php5.5.12 directory, however this never worked for me. Maybe I misunderstood, but I found that if you alter the php.ini file in the C:\wamp\bin\apache\apache2.4.9 directory instead, you will get the results you want. The only thing I altered in the apache php.ini file was remove the semicolon to extension=php_oci8_11g.dll in order to enable it. I then restarted all the services and it now works! I hope this works for you.

Text not wrapping in p tag

Give this style to the <p> tag.

p {
    word-break: break-all;
    white-space: normal;
}

How to remove numbers from string using Regex.Replace?

You can do it with a LINQ like solution instead of a regular expression:

string input = "123- abcd33";
string chars = new String(input.Where(c => c != '-' && (c < '0' || c > '9')).ToArray());

A quick performance test shows that this is about five times faster than using a regular expression.

How to filter object array based on attributes?

here is the working fiddle which works fine in IE8 using jquery MAP function

http://jsfiddle.net/533135/Cj4j7/

json.HOMES = $.map(json.HOMES, function(val, key) {
    if (Number(val.price) <= 1000
            && Number(val.sqft) >= 500
            && Number(val.num_of_beds) >=2
            && Number(val.num_of_baths ) >= 2.5)
        return val;
});

How can I get the domain name of my site within a Django template?

I know this question is old, but I stumbled upon it looking for a pythonic way to get current domain.

def myview(request):
    domain = request.build_absolute_uri('/')[:-1]
    # that will build the complete domain: http://foobar.com

UTF-8, UTF-16, and UTF-32

UTF-8

has no concept of byte-order
uses between 1 and 4 bytes per character
ASCII is a compatible subset of encoding
completely self-synchronizing e.g. a dropped byte from anywhere in a stream will corrupt at most a single character
pretty much all European languages are encoded in two bytes or less per character

UTF-16

must be parsed with known byte-order or reading a byte-order-mark (BOM)
uses either 2 or 4 bytes per character

UTF-32

every character is 4 bytes
must be parsed with known byte-order or reading a byte-order-mark (BOM)

UTF-8 is going to be the most space efficient unless a majority of the characters are from the CJK (Chinese, Japanese, and Korean) character space.

UTF-32 is best for random access by character offset into a byte-array.

Undo scaffolding in Rails

So, Process you should follow to undo scaffolding in rails 4. Run Command as below:

rails d scaffold FooBar
rake db:rollback if you_had_run_rake db:migrate after creating above scaffold?

That's it!

Cheers!

How to delete only the content of file in python

What could be easier than something like this:

import tempfile

for i in range(400):
    with tempfile.TemporaryFile() as tf:
        for j in range(1000):
            tf.write('Line {} of file {}'.format(j,i))

That creates 400 temp files and writes 1000 lines to each temp file. It executes in less than 1/2 second on my unremarkable machine. Each temp file of the total is created and deleted as the context manager opens and closes in this case. It is fast, secure, and cross platform.

Using tempfile is a lot better than trying to reinvent it.

How to detect when a UIScrollView has finished scrolling

func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
    scrollingFinished(scrollView: scrollView)
}

func scrollViewDidEndDragging(_ scrollView: UIScrollView, willDecelerate decelerate: Bool) {
    if decelerate {
        //didEndDecelerating will be called for sure
        return
    }
    scrollingFinished(scrollView: scrollView)        
}

func scrollingFinished(scrollView: UIScrollView) {
   // Your code
}

Change border color on <select> HTML form

Replacing the border-color with outline-color should work.

What are the differences between Deferred, Promise and Future in JavaScript?

What really made it all click for me was this presentation by Domenic Denicola.

In a github gist, he gave the description I like most, it's very concise:

The point of promises is to give us back functional composition and error bubbling in the async world.

In other word, promises are a way that lets us write asynchronous code that is almost as easy to write as if it was synchronous.

Consider this example, with promises:

getTweetsFor("domenic") // promise-returning async function
    .then(function (tweets) {
        var shortUrls = parseTweetsForUrls(tweets);
        var mostRecentShortUrl = shortUrls[0];
        return expandUrlUsingTwitterApi(mostRecentShortUrl); // promise-returning async function
    })
    .then(doHttpRequest) // promise-returning async function
    .then(
        function (responseBody) {
            console.log("Most recent link text:", responseBody);
        },
        function (error) {
            console.error("Error with the twitterverse:", error);
        }
    );

It works as if you were writing this synchronous code:

try {
    var tweets = getTweetsFor("domenic"); // blocking
    var shortUrls = parseTweetsForUrls(tweets);
    var mostRecentShortUrl = shortUrls[0];
    var responseBody = doHttpRequest(expandUrlUsingTwitterApi(mostRecentShortUrl)); // blocking x 2
    console.log("Most recent link text:", responseBody);
} catch (error) {
    console.error("Error with the twitterverse: ", error);
}

(If this still sounds complicated, watch that presentation!)

Regarding Deferred, it's a way to .resolve() or .reject() promises. In the Promises/B spec, it is called .defer(). In jQuery, it's $.Deferred().

Please note that, as far as I know, the Promise implementation in jQuery is broken (see that gist), at least as of jQuery 1.8.2.
It supposedly implements Promises/A thenables, but you don't get the correct error handling you should, in the sense that the whole "async try/catch" functionality won't work. Which is a pity, because having a "try/catch" with async code is utterly cool.

If you are going to use Promises (you should try them out with your own code!), use Kris Kowal's Q. The jQuery version is just some callback aggregator for writing cleaner jQuery code, but misses the point.

Regarding Future, I have no idea, I haven't seen that in any API.

Edit: Domenic Denicola's youtube talk on Promises from @Farm's comment below.

A quote from Michael Jackson (yes, Michael Jackson) from the video:

I want you to burn this phrase in your mind: A promise is an asynchronous value.

This is an excellent description: a promise is like a variable from the future - a first-class reference to something that, at some point, will exist (or happen).

data type not understood

Try:

mmatrix = np.zeros((nrows, ncols))

Since the shape parameter has to be an int or sequence of ints

http://docs.scipy.org/doc/numpy/reference/generated/numpy.zeros.html

Otherwise you are passing ncols to np.zeros as the dtype.

How do I add 24 hours to a unix timestamp in php?

You probably want to add one day rather than 24 hours. Not all days have 24 hours due to (among other circumstances) daylight saving time:

strtotime('+1 day', $timestamp);

How can I check MySQL engine type for a specific table?

SHOW CREATE TABLE <tablename>;

Less parseable but more readable than SHOW TABLE STATUS.

How to select the last column of dataframe

df.T.iloc[-1]

df.T.tail(1)

pd.Series(df.values[:, -1], name=df.columns[-1])

How can I escape a double quote inside double quotes?

A simple example of escaping quotes in the shell:

$ echo 'abc'\''abc'
abc'abc
$ echo "abc"\""abc"
abc"abc

It's done by finishing an already-opened one ('), placing the escaped one (\'), and then opening another one (').

Alternatively:

$ echo 'abc'"'"'abc'
abc'abc
$ echo "abc"'"'"abc"
abc"abc

It's done by finishing already opened one ('), placing a quote in another quote ("'"), and then opening another one (').

More examples: Escaping single-quotes within single-quoted strings

How to properly use jsPDF library

Shouldn't you also be using the jspdf.plugin.from_html.js library? Besides the main library (jspdf.js), you must use other libraries for "special operations" (like jspdf.plugin.addimage.js for using images). Check https://github.com/MrRio/jsPDF.

Trying to fire the onload event on script tag

You should set the src attribute after the onload event, f.ex:

el.onload = function() { //...
el.src = script;

You should also append the script to the DOM before attaching the onload event:

$body.append(el);
el.onload = function() { //...
el.src = script;

Remember that you need to check readystate for IE support. If you are using jQuery, you can also try the getScript() method: http://api.jquery.com/jQuery.getScript/

How to download dependencies in gradle

This version builds on Robert Elliot's, but I'm not 100% sure of its efficacy.

// There are a few dependencies added by one of the Scala plugins that this cannot reach.
task downloadDependencies {
  description "Pre-downloads *most* dependencies"
  doLast {
    configurations.getAsMap().each { name, config ->
      println "Retrieving dependencies for $name"
      try {
        config.files
      } catch (e) {
        project.logger.info e.message // some cannot be resolved, silentlyish skip them
      }
    }
  }
}

I tried putting it into configuration instead of action (by removing doLast) and it broke zinc. I worked around it, but the end result was the same with or without. So, I left it as an explicit state. It seems to work enough to reduce the dependencies that have to be downloaded later, but not eliminate them in my case. I think one of the Scala plugins adds dependencies later.

Naming threads and thread-pools of ExecutorService

This is my customized factory providing a customized names for thread dump analyzers. Usually I just give tf=null to reuse JVM default thread factory. This website has more advanced thread factory.

public class SimpleThreadFactory implements ThreadFactory {
    private ThreadFactory tf;
    private String nameSuffix;

    public SimpleThreadFactory (ThreadFactory tf, String nameSuffix) {
        this.tf = tf!=null ? tf : Executors.defaultThreadFactory();
        this.nameSuffix = nameSuffix; 
    }

    @Override public Thread newThread(Runnable task) {
        // default "pool-1-thread-1" to "pool-1-thread-1-myapp-MagicTask"
        Thread thread=tf.newThread(task);
        thread.setName(thread.getName()+"-"+nameSuffix);
        return thread;
    }
}

- - - - - 

ExecutorService es = Executors.newFixedThreadPool(4, new SimpleThreadFactory(null, "myapp-MagicTask") );

For your convenience this is a thread dump loop for debug purpose.

    ThreadMXBean mxBean=ManagementFactory.getThreadMXBean();
    long[] tids = mxBean.getAllThreadIds();
    System.out.println("------------");
    System.out.println("ThreadCount="+tids.length);
    for(long tid : tids) {
        ThreadInfo mxInfo=mxBean.getThreadInfo(tid);
        if (mxInfo==null) {
            System.out.printf("%d %s\n", tid, "Thread not found");
        } else {
            System.out.printf("%d %s, state=%s, suspended=%d, lockowner=%d %s\n"
                    , mxInfo.getThreadId(), mxInfo.getThreadName()
                    , mxInfo.getThreadState().toString()
                    , mxInfo.isSuspended()?1:0
                    , mxInfo.getLockOwnerId(), mxInfo.getLockOwnerName()
            );
        }
    }

ASP.NET MVC3 - textarea with @Html.EditorFor

Declare in your Model with

  [DataType(DataType.MultilineText)]
  public string urString { get; set; }

Then in .cshtml can make use of editor as below. you can make use of @cols and @rows for TextArea size

     @Html.EditorFor(model => model.urString, new { htmlAttributes = new { @class = "",@cols = 35, @rows = 3 } })

Thanks !

JavaFX: How to get stage from controller during initialization?

Platform.runLater works to prevent execution until initialization is complete. In this case, i want to refresh a list view every time I resize the window width.

Platform.runLater(() -> {
    ((Stage) listView.getScene().getWindow()).widthProperty().addListener((obs, oldVal, newVal) -> {
        listView.refresh();
    });
});

in your case

Platform.runLater(()->{
    ((Stage)myPane.getScene().getWindow()).setOn*whatIwant*(...);
});

Looping through GridView rows and Checking Checkbox Control

Loop like

foreach (GridViewRow row in grid.Rows)
{
   if (((CheckBox)row.FindControl("chkboxid")).Checked)
   {
    //read the label            
   }            
}

summing two columns in a pandas dataframe

Same think can be done using lambda function. Here I am reading the data from a xlsx file.

import pandas as pd
df = pd.read_excel("data.xlsx", sheet_name = 4)
print df

Output:

  cluster Unnamed: 1      date  budget  actual
0       a 2014-01-01  00:00:00   11000   10000
1       a 2014-02-01  00:00:00    1200    1000
2       a 2014-03-01  00:00:00     200     100
3       b 2014-04-01  00:00:00     200     300
4       b 2014-05-01  00:00:00     400     450
5       c 2014-06-01  00:00:00     700    1000
6       c 2014-07-01  00:00:00    1200    1000
7       c 2014-08-01  00:00:00     200     100
8       c 2014-09-01  00:00:00     200     300

Sum two columns into 3rd new one.

df['variance'] = df.apply(lambda x: x['budget'] + x['actual'], axis=1)
print df

Output:

  cluster Unnamed: 1      date  budget  actual  variance
0       a 2014-01-01  00:00:00   11000   10000     21000
1       a 2014-02-01  00:00:00    1200    1000      2200
2       a 2014-03-01  00:00:00     200     100       300
3       b 2014-04-01  00:00:00     200     300       500
4       b 2014-05-01  00:00:00     400     450       850
5       c 2014-06-01  00:00:00     700    1000      1700
6       c 2014-07-01  00:00:00    1200    1000      2200
7       c 2014-08-01  00:00:00     200     100       300
8       c 2014-09-01  00:00:00     200     300       500

Error - Android resource linking failed (AAPT2 27.0.3 Daemon #0)

Same issue occurred for me, but before getting this error, my app was running. So I just did undo 2/3 times. And did changes again. And build app.app ran successfully.

How do you get git to always pull from a specific branch?

Under [branch "master"], try adding the following to the repo's Git config file (.git/config):

[branch "master"]
    remote = origin
    merge = refs/heads/master

This tells Git 2 things:

When you're on the master branch, the default remote is origin.
When using git pull on the master branch, with no remote and branch specified, use the default remote (origin) and merge in the changes from the remote master branch.

I'm not sure why this setup would've been removed from your configuration, though. You may have to follow the suggestions that other people have posted, too, but this may work (or help at least).

If you don't want to edit the config file by hand, you can use the command-line tool instead:

$ git config branch.master.remote origin
$ git config branch.master.merge refs/heads/master

Format an Integer using Java String Format

If you are using a third party library called apache commons-lang, the following solution can be useful:

Use StringUtils class of apache commons-lang :

int i = 5;
StringUtils.leftPad(String.valueOf(i), 3, "0"); // --> "005"

As StringUtils.leftPad() is faster than String.format()

Keep SSH session alive

FYI Putty Users can set the options here

Check if a value is in an array or not with Excel VBA

You want to check whether Examples exists in Range("A1").Value If it fails then to check Example right? I think mycode will work perfect. Please check.

Sub test()
Dim string1 As String, string2 As String
string1 = "Examples"
string2 = "Example"
If InStr(1, Range("A1").Value, string1) > 0 Then
    x = 1
ElseIf InStr(1, Range("A1").Value, string2) > 0 Then
    x = 2
End If

End Sub

Remove a marker from a GoogleMap

Try this, it is updating the current location, and it works fine.

        public void onLocationChanged(@NonNull Location location) {               
        //here we update the location on the map
        
        LatLng myActualLocation = new LatLng(location.getLatitude(), location.getLongitude());
        
        if (markerName!=null){  // marker name is declared as a gloval variable.
            markerName.remove();
        }
        
        markerName = mMap.addMarker(new MarkerOptions().position(myActualLocation).title("Marker Miami").icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_ORANGE)));
        
        // mMap.addMarker(new MarkerOptions().position(myActualLocation).title("Marker Miami").icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_ORANGE)));
        mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(myActualLocation,18));
        
        }

Add string in a certain position in Python

As strings are immutable another way to do this would be to turn the string into a list, which can then be indexed and modified without any slicing trickery. However, to get the list back to a string you'd have to use .join() using an empty string.

>>> hash = '355879ACB6'
>>> hashlist = list(hash)
>>> hashlist.insert(4, '-')
>>> ''.join(hashlist)
'3558-79ACB6'

I am not sure how this compares as far as performance, but I do feel it's easier on the eyes than the other solutions. ;-)

How do I integrate Ajax with Django applications?

Simple and Nice. You don't have to change your views. Bjax handles all your links. Check this out: Bjax

Usage:

<script src="bjax.min.js" type="text/javascript"></script>
<link href="bjax.min.css" rel="stylesheet" type="text/css" />

Finally, include this in the HEAD of your html:

$('a').bjax();

For more settings, checkout demo here: Bjax Demo

Http Servlet request lose params from POST body after read it once

I found good solution for any format of request body. I tested for application/x-www-form-urlencoded and application/json both worked very well. Problem of ContentCachingRequestWrapper that is designed only for x-www-form-urlencoded request body, but not work with e.g. json. I found solution for json link. It had trouble that it didn't support x-www-form-urlencoded. I joined both in my code:

import org.apache.commons.io.IOUtils;
import org.springframework.web.util.ContentCachingRequestWrapper;

import javax.servlet.ReadListener;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStreamReader;

public class MyContentCachingRequestWrapper extends ContentCachingRequestWrapper {

    private byte[] body;

    public MyContentCachingRequestWrapper(HttpServletRequest request) throws IOException {
        super(request);
        super.getParameterMap(); // init cache in ContentCachingRequestWrapper
        body = super.getContentAsByteArray(); // first option for application/x-www-form-urlencoded
        if (body.length == 0) {
          try {
            body = IOUtils.toByteArray(super.getInputStream()); // second option for other body formats
          } catch (IOException ex) {
            body = new byte[0];
          }
        }
    }

    public byte[] getBody() {
        return body;
    }

    @Override
    public ServletInputStream getInputStream() {
        return new RequestCachingInputStream(body);
    }

    @Override
    public BufferedReader getReader() throws IOException {
        return new BufferedReader(new InputStreamReader(getInputStream(), getCharacterEncoding()));
    }

    private static class RequestCachingInputStream extends ServletInputStream {

        private final ByteArrayInputStream inputStream;

        public RequestCachingInputStream(byte[] bytes) {
            inputStream = new ByteArrayInputStream(bytes);
        }

        @Override
        public int read() throws IOException {
            return inputStream.read();
        }

        @Override
        public boolean isFinished() {
            return inputStream.available() == 0;
        }

        @Override
        public boolean isReady() {
            return true;
        }

        @Override
        public void setReadListener(ReadListener readlistener) {
        }

    }

}

Insert line break inside placeholder attribute of a textarea?

You can't do it with pure HTML, but this jQuery plugin will let you: https://github.com/bradjasper/jQuery-Placeholder-Newlines

I have filtered my Excel data and now I want to number the rows. How do I do that?

Okay I found the correct answer to this issue here

Here are the steps:

Filter your data.
Select the cells you want to add the numbering to.
Press F5.
Select Special.
Choose "Visible Cells Only" and press OK.
Now in the top row of your filtered data (just below the header) enter the following code:

=MAX($"Your Column Letter"$1:"Your Column Letter"$"The current row for the filter - 1") + 1

Ex:

=MAX($A$1:A26)+1

Which would be applied starting at cell A27.
Hold Ctrl and press enter.

Note this only works in a range, not in a table!

Spring Boot access static resources missing scr/main/resources

I use Spring Boot, my solution to the problem was

"src/main/resources/myfile.extension"

Hope it helps someone.

Finding version of Microsoft C++ compiler from command-line (for makefiles)

Create a .c file containing just the line:

_MSC_VER

CompilerVersion=_MSC_VER

then pre-process with

cl /nologo /EP <filename>.c

It is easy to parse the output.

GridView - Show headers on empty data source

You may use EmptyDataText as shown below:

<asp:GridView ID="_gridView" RunAt="server" AutoGenerateColumns="false"
          EmptyDataText="No entries found.">

It does not show headers, it renders your message "No entries found." instead.

How can I get the file name from request.FILES?

NOTE if you are using python 3.x:

request.FILES is a multivalue dictionary like object that keeps the files uploaded through an upload file button. Say in your html code the name of the button (type="file") is "myfile" so "myfile" will be the key in this dictionary. If you uploaded one file, then the value for this key will be only one and if you uploaded multiple files, then you will have multiple values for that specific key. If you use request.FILES['myfile'] you will get the first or last value (I cannot say for sure). This is fine if you only uploaded one file, but if you want to get all files you should do this:

list=[] #myfile is the key of a multi value dictionary, values are the uploaded files
for f in request.FILES.getlist('myfile'): #myfile is the name of your html file button
    filename = f.name
    list.append(filename)

of course one can squeeze the whole thing in one line, but this is easy to understand

How to try convert a string to a Guid

use code like this:

new Guid("9D2B0228-4D0D-4C23-8B49-01A698857709")

instead of "9D2B0228-4D0D-4C23-8B49-01A698857709" you can set your string value

When or Why to use a "SET DEFINE OFF" in Oracle Database

Here is the example:

SQL> set define off;
SQL> select * from dual where dummy='&var';

no rows selected

SQL> set define on
SQL> /
Enter value for var: X
old   1: select * from dual where dummy='&var'
new   1: select * from dual where dummy='X'

D
-
X

With set define off, it took a row with &var value, prompted a user to enter a value for it and replaced &var with the entered value (in this case, X).

Import an Excel worksheet into Access using VBA

Pass the sheet name with the Range parameter of the DoCmd.TransferSpreadsheet Method. See the box titled "Worksheets in the Range Parameter" near the bottom of that page.

This code imports from a sheet named "temp" in a workbook named "temp.xls", and stores the data in a table named "tblFromExcel".

Dim strXls As String
strXls = CurrentProject.Path & Chr(92) & "temp.xls"
DoCmd.TransferSpreadsheet acImport, , "tblFromExcel", _
    strXls, True, "temp!"

JPA OneToMany and ManyToOne throw: Repeated column in mapping for entity column (should be mapped with insert="false" update="false")

You should never use the unidirectional @OneToMany annotation because:

It generates inefficient SQL statements
It creates an extra table which increases the memory footprint of your DB indexes

Now, in your first example, both sides are owning the association, and this is bad.

While the @JoinColumn would let the @OneToMany side in charge of the association, it's definitely not the best choice. Therefore, always use the mappedBy attribute on the @OneToMany side.

public class User{
    @OneToMany(fetch=FetchType.LAZY, cascade = CascadeType.ALL, mappedBy="user")
    public List<APost> aPosts;

    @OneToMany(fetch=FetchType.LAZY, cascade = CascadeType.ALL, mappedBy="user")
    public List<BPost> bPosts;
}

public class BPost extends Post {

    @ManyToOne(fetch=FetchType.LAZY)    
    public User user;
}

public class APost extends Post {

     @ManyToOne(fetch=FetchType.LAZY) 
     public User user;
}

unable to dequeue a cell with identifier Cell - must register a nib or a class for the identifier or connect a prototype cell in a storyboard

Swift 5

you need to use UINib method to register cell in viewDidLoad

override func viewDidLoad() 
{
    super.viewDidLoad()
    // Do any additional setup after loading the view.

    //register table view cell        
    tableView.register(UINib.init(nibName: "CustomTableViewCell", bundle: nil), forCellReuseIdentifier: "CustomTableViewCell")
}

Ruby Regexp group matching, assign variables on 1 line

TypeScript and React - children type?

From the TypeScript site: https://github.com/Microsoft/TypeScript/issues/6471

The recommended practice is to write the props type as {children?: any}

That worked for me. The child node can be many different things, so explicit typing can miss cases.

There's a longer discussion on the followup issue here: https://github.com/Microsoft/TypeScript/issues/13618, but the any approach still works.

Retrofit 2: Get JSON from Response body

try {                                                                           
    JSONObject jsonObject = new JSONObject(response.body().string());           
    System.out.println(jsonObject);                                             
} catch (JSONException | IOException e ) {                                      
    e.printStackTrace();                                                        
}

Change value of input and submit form in JavaScript

No. When your input type is submit, you should have an onsubmit event declared in the markup and then do the changes you want. Meaning, have an onsubmit defined in your form tag.

Otherwise change the input type to a button and then define an onclick event for that button.

Find stored procedure by name

You can use this query:

SELECT 
    ROUTINE_CATALOG AS DatabaseName ,
    ROUTINE_SCHEMA AS SchemaName,
    SPECIFIC_NAME AS SPName ,
    ROUTINE_DEFINITION AS SPBody ,
    CREATED AS CreatedDate,
    LAST_ALTERED AS LastModificationDate
FROM INFORMATION_SCHEMA.ROUTINES
WHERE 
    (ROUTINE_DEFINITION LIKE '%%')
    AND 
    (ROUTINE_TYPE='PROCEDURE')
    AND
    (SPECIFIC_NAME LIKE '%AssessmentToolDegreeDel')

As you can see, you can do search inside the body of Stored Procedure also.

How to cache Google map tiles for offline usage?

If you are trying to cache the tiles that Google serves, that may be a violation of Google's Terms of Service (unless, under certain circumstances, if you've purchased their enterprise Maps API Premier). That's why gmapcatcher has it crossed off their list. See http://code.google.com/p/gmapcatcher/issues/detail?id=210.

At the gmapcatcher URL above, you will also find a shell script that can download tiles (or so its author says).

There are also other projects that try to make Google Maps available offline:

http://code.google.com/p/ogmaps/

http://code.google.com/p/gmapoffline/

Lastly, if Google Earth can meet your needs, then you can use that. Offline usage of Google Earth requires a Google Earth Enterprise license according to http://www.google.com/permissions/geoguidelines.html.

Note that the preceding page also says: "You may not scrape or otherwise export Content from Google Maps or Earth or save it for offline use." So if you try to cache tiles, that will almost certainly be considered (by Google, anyway) a violation of the Terms of Service.

Safe navigation operator (?.) or (!.) and null property paths

! is non-null assertion operator (post-fix expression) - it just saying to type checker that you're sure that a is not null or undefined.

the operation a! produces a value of the type of a with null and undefined excluded

Optional chaining finally made it to typescript (3.7)

The optional chaining operator ?. permits reading the value of a property located deep within a chain of connected objects without having to expressly validate that each reference in the chain is valid. The ?. operator functions similarly to the . chaining operator, except that instead of causing an error if a reference is nullish (null or undefined), the expression short-circuits with a return value of undefined. When used with function calls, it returns undefined if the given function does not exist.

Syntax:

obj?.prop // Accessing object's property
obj?.[expr] // Optional chaining with expressions
arr?.[index] // Array item access with optional chaining
func?.(args) // Optional chaining with function calls

Pay attention:

Optional chaining is not valid on the left-hand side of an assignment

const object = {};
object?.property = 1; // Uncaught SyntaxError: Invalid left-hand side in assignment

how to get list of port which are in use on the server

Open up a command prompt then type...

netstat -a

Postgresql : syntax error at or near "-"

i was trying trying to GRANT read-only privileges to a particular table to a user called walters-ro. So when i ran the sql command # GRANT SELECT ON table_name TO walters-ro; --- i got the following error..`syntax error at or near “-”

The solution to this was basically putting the user_name into double quotes since there is a dash(-) between the name.

# GRANT SELECT ON table_name TO "walters-ro";

That solved the problem.

Change the background color of a pop-up dialog

You can create a custom alertDialog and use a xml layout. in the layout, you can set the background color and textcolor.

Something like this:

Dialog dialog = new Dialog(this, android.R.style.Theme_Translucent_NoTitleBar);
LayoutInflater inflater = (LayoutInflater)ActivityName.this.getSystemService(LAYOUT_INFLATER_SERVICE);
View layout = inflater.inflate(R.layout.custom_layout,(ViewGroup)findViewById(R.id.layout_root));
dialog.setContentView(view);

Chrome ignores autocomplete="off"

TL;DR: Tell Chrome that this is a new password input and it won't provide old ones as autocomplete suggestions:

<input type="password" name="password" autocomplete="new-password">

autocomplete="off" doesn't work due to a design decision - lots of research shows that users have much longer and harder to hack passwords if they can store them in a browser or password manager.

The specification for autocomplete has changed, and now supports various values to make login forms easy to auto complete:

<!-- Auto fills with the username for the site, even though it's email format -->
<input type="email" name="email" autocomplete="username">

<!-- current-password will populate for the matched username input  -->
<input type="password" autocomplete="current-password" />

If you don't provide these Chrome still tries to guess, and when it does it ignores autocomplete="off".

The solution is that autocomplete values also exist for password reset forms:

<label>Enter your old password:
    <input type="password" autocomplete="current-password" name="pass-old" />
</label>
<label>Enter your new password:
    <input type="password" autocomplete="new-password" name="pass-new" />
</label>
<label>Please repeat it to be sure:
    <input type="password" autocomplete="new-password" name="pass-repeat" />
</label>

You can use this autocomplete="new-password" flag to tell Chrome not to guess the password, even if it has one stored for this site.

Chrome can also manage passwords for sites directly using the credentials API, which is a standard and will probably have universal support eventually.

Trying to create a file in Android: open failed: EROFS (Read-only file system)

I have tried this with and without the WRITE_INTERNAL_STORAGE permission.

There is no WRITE_INTERNAL_STORAGE permission in Android.

How do I create this file for writing?

You don't, except perhaps on a rooted device, if your app is running with superuser privileges. You are trying to write to the root of internal storage, which apps do not have access to.

Please use the version of the FileOutputStream constructor that takes a File object. Create that File object based off of some location that you can write to, such as:

getFilesDir() (called on your Activity or other Context)
getExternalFilesDir() (called on your Activity or other Context)

The latter will require WRITE_EXTERNAL_STORAGE as a permission.

Is there an easier way than writing it to a file then reading from it again?

You can temporarily put it in a static data member.

because many people don't have SD card slots

"SD card slots" are irrelevant, by and large. 99% of Android device users will have external storage -- the exception will be 4+ year old devices where the user removed their SD card. Devices manufactured since mid-2010 have external storage as part of on-board flash, not as removable media.

How to write a multiline command?

If you came here looking for an answer to this question but not exactly the way the OP meant, ie how do you get multi-line CMD to work in a single line, I have a sort of dangerous answer for you.

Trying to use this with things that actually use piping, like say findstr is quite problematic. The same goes for dealing with elses. But if you just want a multi-line conditional command to execute directly from CMD and not via a batch file, this should do work well.

Let's say you have something like this in a batch that you want to run directly in command prompt:

@echo off
for /r %%T IN (*.*) DO (
    if /i "%%~xT"==".sln" (
        echo "%%~T" is a normal SLN file, and not a .SLN.METAPROJ or .SLN.PROJ file
        echo Dumping SLN file contents
        type "%%~T"
    )
)

Now, you could use the line-continuation carat (^) and manually type it out like this, but warning, it's tedious and if you mess up you can learn the joy of typing it all out again.

Well, it won't work with just ^ thanks to escaping mechanisms inside of parentheses shrug At least not as-written. You actually would need to double up the carats like so:

@echo off ^
More? for /r %T IN (*.sln) DO (^^
More? if /i "%~xT"==".sln" (^^
More? echo "%~T" is a normal SLN file, and not a .SLN.METAPROJ or .SLN.PROJ file^^
More? echo Dumping SLN file contents^^
More? type "%~T"))

Instead, you can be a dirty sneaky scripter from the wrong side of the tracks that don't need no carats by swapping them out for a single pipe (|) per continuation of a loop/expression:

@echo off
for /r %T IN (*.sln) DO if /i "%~xT"==".sln" echo "%~T" is a normal SLN file, and not a .SLN.METAPROJ or .SLN.PROJ file | echo Dumping SLN file contents | type "%~T"

C# : changing listbox row color?

I find solution that instead of using ListBox I used ListView.It allows to change list items BackColor.

private void listView1_Refresh()
{
    for (int i = 0; i < listView1.Items.Count; i++)
    {
        listView1.Items[i].BackColor = Color.Red;
        for (int j = 0; j < existingStudents.Count; j++)
        {
            if (listView1.Items[i].ToString().Contains(existingStudents[j]))
            {
                listView1.Items[i].BackColor = Color.Green;
            }
        }
    }
}

How to give a Blob uploaded as FormData a file name?

When you are using Google Chrome you can use/abuse the Google Filesystem API for this. Here you can create a file with a specified name and write the content of a blob to it. Then you can return the result to the user.

I have not found a good way for Firefox yet; probably a small piece of Flash like downloadify is required to name a blob.

IE10 has a msSaveBlob() function in the BlobBuilder.

Maybe this is more for downloading a blob, but it is related.

Unable to load DLL 'SQLite.Interop.dll'

The default installation of the multi-architecture (x86, x64) version of SQLite from NuGet exhibits the behavior that you described. If you would like to load the correct version for actual architecture that the .NET runtime chose to run your application on your machine, then you can give the DLL loader a hint about where to locate the correct library as follows:

Add a declaration for the kernel32.dll function call to SetDLLDirectory() before your Program.Main():

    [System.Runtime.InteropServices.DllImport("kernel32.dll", CharSet = System.Runtime.InteropServices.CharSet.Unicode, SetLastError = true)]
    [return: System.Runtime.InteropServices.MarshalAs(System.Runtime.InteropServices.UnmanagedType.Bool)]
    static extern bool SetDllDirectory(string lpPathName);

Then use your own method for determining the correct subdirectory to find the architecture specific version of 'SQLite.Interop.dll'. I use the following code:

    [STAThread]
    static void Main()
    {
        int wsize = IntPtr.Size;
        string libdir = (wsize == 4)?"x86":"x64";
        string appPath = System.IO.Path.GetDirectoryName(Application.ExecutablePath);
        SetDllDirectory(System.IO.Path.Combine(appPath, libdir));

npm notice created a lockfile as package-lock.json. You should commit this file

You can update the existing package-lock.json file instead of creating a new one. Just change the version number to a different one.

{ "name": "theme","version": "1.0.1", "description": "theme description"}

Instagram how to get my user id from username?

First Create an Application on Instagram and get Client Id for your application

http://instagram.com/developer/

Now just copy paste following Url into browser window by replacing your Username and your Client Id https://api.instagram.com/v1/users/search?q=[Your-username]&client_id=[Your-Client-Id]

you will get a Json Result containing General Information about your account along with your Numeric user Id

Python: can't assign to literal

You are trying to assign to literal integer values. 1, 2, etc. are not valid names; they are only valid integers:

>>> 1
1
>>> 1 = 'something'
  File "<stdin>", line 1
SyntaxError: can't assign to literal

You probably want to use a list or dictionary instead:

names = []
for i in range(1, 6):
    name = input("Please enter name {}:".format(i))
    names.append(name)

Using a list makes it much easier to pick a random value too:

winner = random.choice(names)
print('Well done {}. You are the winner!'.format(winner))

Disabling buttons on react native

I think the most efficient way is to wrap the touchableOpacity with a view and add the prop pointerEvents with a style condition.

<View style={this.state.disabled && commonStyles.buttonDisabled}        
      pointerEvents={this.state.disabled ? "none" : "auto"}>
  <TouchableOpacity
    style={styles.connectButton}>
  <Text style={styles.connectButtonText}">CONNECT </Text>
  </TouchableOpacity>
</View>

CSS:

buttonDisabled: {
    opacity: 0.7
  }

How can I send an email by Java application using GMail, Yahoo, or Hotmail?

First download the JavaMail API and make sure the relevant jar files are in your classpath.

Here's a full working example using GMail.

import java.util.*;
import javax.mail.*;
import javax.mail.internet.*;

public class Main {

    private static String USER_NAME = "*****";  // GMail user name (just the part before "@gmail.com")
    private static String PASSWORD = "********"; // GMail password
    private static String RECIPIENT = "[email protected]";

    public static void main(String[] args) {
        String from = USER_NAME;
        String pass = PASSWORD;
        String[] to = { RECIPIENT }; // list of recipient email addresses
        String subject = "Java send mail example";
        String body = "Welcome to JavaMail!";

        sendFromGMail(from, pass, to, subject, body);
    }

    private static void sendFromGMail(String from, String pass, String[] to, String subject, String body) {
        Properties props = System.getProperties();
        String host = "smtp.gmail.com";
        props.put("mail.smtp.starttls.enable", "true");
        props.put("mail.smtp.host", host);
        props.put("mail.smtp.user", from);
        props.put("mail.smtp.password", pass);
        props.put("mail.smtp.port", "587");
        props.put("mail.smtp.auth", "true");

        Session session = Session.getDefaultInstance(props);
        MimeMessage message = new MimeMessage(session);

        try {
            message.setFrom(new InternetAddress(from));
            InternetAddress[] toAddress = new InternetAddress[to.length];

            // To get the array of addresses
            for( int i = 0; i < to.length; i++ ) {
                toAddress[i] = new InternetAddress(to[i]);
            }

            for( int i = 0; i < toAddress.length; i++) {
                message.addRecipient(Message.RecipientType.TO, toAddress[i]);
            }

            message.setSubject(subject);
            message.setText(body);
            Transport transport = session.getTransport("smtp");
            transport.connect(host, from, pass);
            transport.sendMessage(message, message.getAllRecipients());
            transport.close();
        }
        catch (AddressException ae) {
            ae.printStackTrace();
        }
        catch (MessagingException me) {
            me.printStackTrace();
        }
    }
}

Naturally, you'll want to do more in the catch blocks than print the stack trace as I did in the example code above. (Remove the catch blocks to see which method calls from the JavaMail API throw exceptions so you can better see how to properly handle them.)

Thanks to @jodonnel and everyone else who answered. I'm giving him a bounty because his answer led me about 95% of the way to a complete answer.

EF Code First "Invalid column name 'Discriminator'" but no inheritance

Old Q, but for posterity...it also also happens (.NET Core 2.1) if you have a self-referencing navigation property ("Parent" or "Children" of the same type) but the Id property name isn't what EF expects. That is, I had an "Id" property on my class called WorkflowBase, and it had an array of related child steps, which were also of type WorkflowBase, and it kept trying to associate them with a non-existent "WorkflowBaseId" (the name i suppose it prefers as a natural/conventional default). I had to explicitly configure it using HasMany(), WithOne(), and HasConstraintName() to tell it how to traverse. But I spent a few hours thinking the problem was in 'locally' mapping the object's primary key, which i attempted to fix a bunch of different ways but which was probably always working.

How to use a BackgroundWorker?

You can update progress bar only from ProgressChanged or RunWorkerCompleted event handlers as these are synchronized with the UI thread.

The basic idea is. Thread.Sleep just simulates some work here. Replace it with your real routing call.

public Form1()
{
    InitializeComponent();

    backgroundWorker1.DoWork += backgroundWorker1_DoWork;
    backgroundWorker1.ProgressChanged += backgroundWorker1_ProgressChanged;
    backgroundWorker1.WorkerReportsProgress = true;
}

private void button1_Click(object sender, EventArgs e)
{
    backgroundWorker1.RunWorkerAsync();
}

private void backgroundWorker1_DoWork(object sender, System.ComponentModel.DoWorkEventArgs e)
{
    for (int i = 0; i < 100; i++)
    {
        Thread.Sleep(1000);
        backgroundWorker1.ReportProgress(i);
    }
}

private void backgroundWorker1_ProgressChanged(object sender, System.ComponentModel.ProgressChangedEventArgs e)
{
    progressBar1.Value = e.ProgressPercentage;
}

What's the difference between a Python module and a Python package?

First, keep in mind that, in its precise definition, a module is an object in the memory of a Python interpreter, often created by reading one or more files from disk. While we may informally call a disk file such as a/b/c.py a "module," it doesn't actually become one until it's combined with information from several other sources (such as sys.path) to create the module object.

(Note, for example, that two modules with different names can be loaded from the same file, depending on sys.path and other settings. This is exactly what happens with python -m my.module followed by an import my.module in the interpreter; there will be two module objects, __main__ and my.module, both created from the same file on disk, my/module.py.)

A package is a module that may have submodules (including subpackages). Not all modules can do this. As an example, create a small module hierarchy:

$ mkdir -p a/b
$ touch a/b/c.py

Ensure that there are no other files under a. Start a Python 3.4 or later interpreter (e.g., with python3 -i) and examine the results of the following statements:

import a
a                ? <module 'a' (namespace)>
a.b              ? AttributeError: module 'a' has no attribute 'b'
import a.b.c
a.b              ? <module 'a.b' (namespace)>
a.b.c            ? <module 'a.b.c' from '/home/cjs/a/b/c.py'>

Modules a and a.b are packages (in fact, a certain kind of package called a "namespace package," though we wont' worry about that here). However, module a.b.c is not a package. We can demonstrate this by adding another file, a/b.py to the directory structure above and starting a fresh interpreter:

import a.b.c
? ImportError: No module named 'a.b.c'; 'a.b' is not a package
import a.b
a                ? <module 'a' (namespace)>
a.__path__       ? _NamespacePath(['/.../a'])
a.b              ? <module 'a.b' from '/home/cjs/tmp/a/b.py'>
a.b.__path__     ? AttributeError: 'module' object has no attribute '__path__'

Python ensures that all parent modules are loaded before a child module is loaded. Above it finds that a/ is a directory, and so creates a namespace package a, and that a/b.py is a Python source file which it loads and uses to create a (non-package) module a.b. At this point you cannot have a module a.b.c because a.b is not a package, and thus cannot have submodules.

You can also see here that the package module a has a __path__ attribute (packages must have this) but the non-package module a.b does not.

Laravel Pagination links not including other GET parameters

You could use

->appends(request()->query())

Example in the Controller:

$users = User::search()->order()->with('type:id,name')
    ->paginate(30)
    ->appends(request()->query());

return view('users.index', compact('users'));

Example in the View:

{{ $users->appends(request()->query())->links() }}

How to add 'libs' folder in Android Studio?

You can create lib folder inside app you press right click and select directory you named as libs its will be worked

How to add target="_blank" to JavaScript window.location?

window.location sets the URL of your current window. To open a new window, you need to use window.open. This should work:

function ToKey(){
    var key = document.tokey.key.value.toLowerCase();
    if (key == "smk") {
        window.open('http://www.smkproduction.eu5.org', '_blank');
    } else {
        alert("Kodi nuk është valid!");
    }
}

How do I remove carriage returns with Ruby?

Generally when I deal with stripping \r or \n, I'll look for both by doing something like

lines.gsub(/\r\n?/, "\n");

I've found that depending on how the data was saved (the OS used, editor used, Jupiter's relation to Io at the time) there may or may not be the newline after the carriage return. It does seem weird that you see both characters in hex mode. Hope this helps.

PHP - Debugging Curl

Here is an even simplier way, by writing directly to php error output

curl_setopt($curl, CURLOPT_VERBOSE, true);
curl_setopt($curl, CURLOPT_STDERR, fopen('php://stderr', 'w'));

How to make a drop down list in yii2?

This is about generating data, and so is more properly done from the model. Imagine if you ever wanted to change the way data is displayed in the drop-down box, say add a surname or something. You'd have to find every drop-down box and change the arrayHelper. I use a function in my models to return the data for a dropdown, so I don't have to repeat code in views. It also has the advantage that I can specify filter here and have them apply to every dropdown created from this model;

/* Model Standard.php */

public function getDropdown(){
      return ArrayHelper::map(self::find()->all(), 's_id', 'name'));
}

You can use this in your view file like this;

echo $form->field($model, 'attribute')
        ->dropDownList(
            $model->dropDown
        );

Regular expression matching a multiline block of text

If each file only has one sequence of aminoacids, I wouldn't use regular expressions at all. Just something like this:

def read_amino_acid_sequence(path):
    with open(path) as sequence_file:
        title = sequence_file.readline() # read 1st line
        aminoacid_sequence = sequence_file.read() # read the rest

    # some cleanup, if necessary
    title = title.strip() # remove trailing white spaces and newline
    aminoacid_sequence = aminoacid_sequence.replace(" ","").replace("\n","")
    return title, aminoacid_sequence

Convert the values in a column into row names in an existing data frame

As of 2016 you can also use the tidyverse.

library(tidyverse)
samp %>% remove_rownames %>% column_to_rownames(var="names")

Sending email through Gmail SMTP server with C#

Another thing that I've found is that you must change your password at least once. And try to use a secure level password (do not use the same user as password, 123456, etc.)

How can I reorder my divs using only CSS?

As others have said, this isn't something you'd want to be doing in CSS. You can fudge it with absolute positioning and strange margins, but it's just not a robust solution. The best option in your case would be to turn to javascript. In jQuery, this is a very simple task:

$('#secondDiv').insertBefore('#firstDiv');

or more generically:

$('.swapMe').each(function(i, el) {
    $(el).insertBefore($(el).prev());
});

Can I target all <H> tags with a single selector?

The new :is() CSS pseudo-class can do it in one selector:

:is(h1, h2, h3, h4, h5, h6) {
  color: red;
}

Webpack not excluding node_modules

This worked for me:

exclude: [/bower_components/, /node_modules/]

module.loaders

A array of automatically applied loaders.

Each item can have these properties:

test: A condition that must be met

exclude: A condition that must not be met

include: A condition that must be met

loader: A string of "!" separated loaders

loaders: A array of loaders as string

A condition can be a RegExp, an absolute path start, or an array of one of these combined with "and".

See http://webpack.github.io/docs/configuration.html#module-loaders

MongoDB query with an 'or' condition

Just thought I'd update in-case anyone stumbles across this page in the future. As of 1.5.3, mongo now supports a real $or operator: http://www.mongodb.org/display/DOCS/Advanced+Queries#AdvancedQueries-%24or

Your query of "(expires >= Now()) OR (expires IS NULL)" can now be rendered as:

{$or: [{expires: {$gte: new Date()}}, {expires: null}]}

Max size of URL parameters in _GET

Ok, it seems that some versions of PHP have a limitation of length of GET params:

Please note that PHP setups with the suhosin patch installed will have a default limit of 512 characters for get parameters. Although bad practice, most browsers (including IE) supports URLs up to around 2000 characters, while Apache has a default of 8000.

To add support for long parameters with suhosin, add suhosin.get.max_value_length = <limit> in php.ini

Source: http://www.php.net/manual/en/reserved.variables.get.php#101469

How do I push a local Git branch to master branch in the remote?

$ git push origin develop:master

or, more generally

$ git push <remote> <local branch name>:<remote branch to push into>

display HTML page after loading complete

The easiest thing to do is putting a div with the following CSS in the body:

#hideAll
 {
   position: fixed;
   left: 0px; 
   right: 0px; 
   top: 0px; 
   bottom: 0px; 
   background-color: white;
   z-index: 99; /* Higher than anything else in the document */

 }

(Note that position: fixed won't work in IE6 - I know of no sure-fire way of doing this in that browser)

Add the DIV like so (directly after the opening body tag):

<div style="display: none" id="hideAll">&nbsp;</div>

show the DIV directly after :

 <script type="text/javascript">
   document.getElementById("hideAll").style.display = "block";
 </script>

and hide it onload:

 window.onload = function() 
  { document.getElementById("hideAll").style.display = "none"; }

or using jQuery

 $(window).load(function() {  document.getElementById("hideAll").style.display = "none"; });

this approach has the advantage that it will also work for clients who have JavaScript turned off. It shouldn't cause any flickering or other side-effects, but not having tested it, I can't entirely guarantee it for every browser out there.

npm install -g less does not work: EACCES: permission denied

Use sudo -i to switch to $root, then execute npm install -g xxxx

PHP if not statements

No matter what $action is, it will always either not be "add" OR not be "delete", which is why the if condition always passes. What you want is to use && instead of ||:

(!isset($action)) || ($action !="add" && $action !="delete"))

Difference between Groovy Binary and Source release?

Binary releases contain computer readable version of the application, meaning it is compiled. Source releases contain human readable version of the application, meaning it has to be compiled before it can be used.

java.util.Date and getYear()

Yup, this is in fact what's happening. See also the Javadoc:

Returns:
   the year represented by this date, minus 1900.

The getYear method is deprecated for this reason. So, don't use it.

Note also that getMonth returns a number between 0 and 11. Therefore, this.sale.getSaleDate().getMonth() returns 1 for February, instead of 2. While java.util.Calendar doesn't add 1900 to all years, it does suffer from the off-by-one-month problem.

You're much better off using JodaTime.

response.sendRedirect() from Servlet to JSP does not seem to work

I'm posting this answer because the one with the most votes led me astray. To redirect from a servlet, you simply do this:

response.sendRedirect("simpleList.do")

In this particular question, I think @M-D is correctly explaining why the asker is having his problem, but since this is the first result on google when you search for "Redirect from Servlet" I think it's important to have an answer that helps most people, not just the original asker.

How do I skip an iteration of a `foreach` loop?

You could also flip your if test:


foreach ( int number in numbers )
{
     if ( number >= 0 )
     {
        //process number
     }
 }

Convert between UIImage and Base64 string

Decoding using convenience initialiser - Swift 5

extension UIImage {
    convenience init?(base64String: String) {
        guard let data = Data(base64Encoded: base64String) else { return nil }
        self.init(data: data)
    }
}

Should I add the Visual Studio .suo and .user files to source control?

.user is the user settings, and I think .suo is the solution user options. You don't want these files under source control; they will be re-created for each user.

How can I change my default database in SQL Server without using MS SQL Server Management Studio?

To do it the GUI way, you need to go edit your login. One of its properties is the default database used for that login. You can find the list of logins under the Logins node under the Security node. Then select your login and right-click and pick Properties. Change the default database and your life will be better!

Note that someone with sysadmin privs needs to be able to login to do this or to run the query from the previous post.

Java to Jackson JSON serialization: Money fields

As Sahil Chhabra suggested you can use @JsonFormat with proper shape on your variable. In case you would like to apply it on every BigDecimal field you have in your Dto's you can override default format for given class.

@Configuration
public class JacksonObjectMapperConfiguration {

    @Autowired
    public void customize(ObjectMapper objectMapper) {
         objectMapper
            .configOverride(BigDecimal.class).setFormat(JsonFormat.Value.forShape(JsonFormat.Shape.STRING));
    }
}

Understanding the map function

map doesn't relate to a Cartesian product at all, although I imagine someone well versed in functional programming could come up with some impossible to understand way of generating a one using map.

map in Python 3 is equivalent to this:

def map(func, iterable):
    for i in iterable:
        yield func(i)

and the only difference in Python 2 is that it will build up a full list of results to return all at once instead of yielding.

Although Python convention usually prefers list comprehensions (or generator expressions) to achieve the same result as a call to map, particularly if you're using a lambda expression as the first argument:

[func(i) for i in iterable]

As an example of what you asked for in the comments on the question - "turn a string into an array", by 'array' you probably want either a tuple or a list (both of them behave a little like arrays from other languages) -

 >>> a = "hello, world"
 >>> list(a)
['h', 'e', 'l', 'l', 'o', ',', ' ', 'w', 'o', 'r', 'l', 'd']
>>> tuple(a)
('h', 'e', 'l', 'l', 'o', ',', ' ', 'w', 'o', 'r', 'l', 'd')

A use of map here would be if you start with a list of strings instead of a single string - map can listify all of them individually:

>>> a = ["foo", "bar", "baz"]
>>> list(map(list, a))
[['f', 'o', 'o'], ['b', 'a', 'r'], ['b', 'a', 'z']]

Note that map(list, a) is equivalent in Python 2, but in Python 3 you need the list call if you want to do anything other than feed it into a for loop (or a processing function such as sum that only needs an iterable, and not a sequence). But also note again that a list comprehension is usually preferred:

>>> [list(b) for b in a]
[['f', 'o', 'o'], ['b', 'a', 'r'], ['b', 'a', 'z']]

YAML: Do I need quotes for strings in YAML?

I had this concern when working on a Rails application with Docker.

My most preferred approach is to generally not use quotes. This includes not using quotes for:

variables like ${RAILS_ENV}
values separated by a colon (:) like postgres-log:/var/log/postgresql
other strings values

I, however, use double-quotes for integer values that need to be converted to strings like:

docker-compose version like version: "3.8"
port numbers like "8080:8080"

However, for special cases like booleans, floats, integers, and other cases, where using double-quotes for the entry values could be interpreted as strings, please do not use double-quotes.

Here's a sample docker-compose.yml file to explain this concept:

version: "3"

services:
  traefik:
    image: traefik:v2.2.1
    command:
      - --api.insecure=true # Don't do that in production
      - --providers.docker=true
      - --providers.docker.exposedbydefault=false
      - --entrypoints.web.address=:80
    ports:
      - "80:80"
      - "8080:8080"
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock:ro

That's all.

I hope this helps

Change UITableView height dynamically

Lots of the answers here don't honor changes of the table or are way too complicated. Using a subclass of UITableView that will properly set intrinsicContentSize is a far easier solution when using autolayout. No height constraints etc. needed.

class UIDynamicTableView: UITableView
{
    override var intrinsicContentSize: CGSize {
        self.layoutIfNeeded()
        return CGSize(width: UIViewNoIntrinsicMetric, height: self.contentSize.height)
    }

    override func reloadData() {
        super.reloadData()
        self.invalidateIntrinsicContentSize()
    }
}

Set the class of your TableView to UIDynamicTableView in the interface builder and watch the magic as this TableView will change it's size after a call to reloadData().

Call jQuery Ajax Request Each X Minutes

You have a couple options, you could setTimeout() or setInterval(). Here's a great article that elaborates on how to use them.

The magic is that they're built in to JavaScript, you can use them with any library.

How do I view the list of functions a Linux shared library is exporting?

Among other already mentioned tools you can use also readelf (manual). It is similar to objdump but goes more into detail. See this for the difference explanation.

$ readelf -sW /lib/liblzma.so.5 |head -n10

Symbol table '.dynsym' contains 128 entries:
   Num:    Value  Size Type    Bind   Vis      Ndx Name
     0: 00000000     0 NOTYPE  LOCAL  DEFAULT  UND
     1: 00000000     0 FUNC    GLOBAL DEFAULT  UND pthread_mutex_unlock@GLIBC_2.0 (4)
     2: 00000000     0 FUNC    GLOBAL DEFAULT  UND pthread_mutex_destroy@GLIBC_2.0 (4)
     3: 00000000     0 NOTYPE  WEAK   DEFAULT  UND _ITM_deregisterTMCloneTable
     4: 00000000     0 FUNC    GLOBAL DEFAULT  UND memmove@GLIBC_2.0 (5)
     5: 00000000     0 FUNC    GLOBAL DEFAULT  UND free@GLIBC_2.0 (5)
     6: 00000000     0 FUNC    GLOBAL DEFAULT  UND memcpy@GLIBC_2.0 (5)

add item to dropdown list in html using javascript

i think you have only defined the function. you are not triggering it anywhere.

please do

window.onload = addList();

or trigger it on some other event

after its definition

see this fiddle

How to take screenshot of a div with JavaScript?

If you wish to have "Save as" dialog, just pass image into php script, which adds appropriate headers

Example "all-in-one" script script.php

<?php if(isset($_GET['image'])):
    $image = $_GET['image'];

    if(preg_match('#^data:image/(.*);base64,(.*)$#s', $image, $match)){
        $base64 = $match[2];
        $imageBody = base64_decode($base64);
        $imageFormat = $match[1];

        header('Content-type: application/octet-stream');
        header("Pragma: public");
        header("Expires: 0");
        header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
        header("Cache-Control: private", false); // required for certain browsers
        header("Content-Disposition: attachment; filename=\"file.".$imageFormat."\";" ); //png is default for toDataURL
        header("Content-Transfer-Encoding: binary");
        header("Content-Length: ".strlen($imageBody));
        echo $imageBody;
    }
    exit();
endif;?>

<script type='text/javascript' src='http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js?ver=1.7.2'></script>
<canvas id="canvas" width="300" height="150"></canvas>
<button id="btn">Save</button>
<script>
    $(document).ready(function(){
        var canvas = document.getElementById('canvas');
        var oCtx = canvas.getContext("2d");
        oCtx.beginPath();
        oCtx.moveTo(0,0);
        oCtx.lineTo(300,150);
        oCtx.stroke();

        $('#btn').on('click', function(){
            // opens dialog but location doesnt change due to SaveAs Dialog
            document.location.href = '/script.php?image=' + canvas.toDataURL();
        });
    });
</script>

Is there any difference between GROUP BY and DISTINCT

Use DISTINCT if you just want to remove duplicates. Use GROUPY BY if you want to apply aggregate operators (MAX, SUM, GROUP_CONCAT, ..., or a HAVING clause).

AngularJS $watch window resize inside directive

You shouldn't need a $watch. Just bind to resize event on window:

DEMO

'use strict';

var app = angular.module('plunker', []);

app.directive('myDirective', ['$window', function ($window) {

     return {
        link: link,
        restrict: 'E',
        template: '<div>window size: {{width}}px</div>'
     };

     function link(scope, element, attrs){

       scope.width = $window.innerWidth;

       angular.element($window).bind('resize', function(){

         scope.width = $window.innerWidth;

         // manuall $digest required as resize event
         // is outside of angular
         scope.$digest();
       });

     }

 }]);

jQuery Set Selected Option Using Next

And if you want to specify select's ID:

$("#nextPageLink").click(function(){
  $('#myselect option:selected').next('option').attr('selected', 'selected');
  $("#myselect").change();
});

If you click on item with id "nextPageLink", next option will be selected and onChange() event will be called. It may look like this:

$("#myselect").change(function(){
  $('#myDivId').load(window.location.pathname,{myvalue:$("select#myselect").val()});
});

OnChange() event uses Ajax to load something into specified div.

window.location.pathname = actual address

OnChange() event is defined because it allowes you to change value not only using netx/prev button, but directly using standard selection. If value is changed, page does somethig automatically.

How to install JDK 11 under Ubuntu?

I created a Bash script that basically automates the manual installation described in the linked similar question. It requires the tar.gz file as well as its SHA256 sum value. You can find out more info and download the script from my GitHub project page. It is provided under MIT license.

How to have multiple colors in a Windows batch file?

You can do multicolor outputs without any external programs.

@echo off
SETLOCAL EnableDelayedExpansion
for /F "tokens=1,2 delims=#" %%a in ('"prompt #$H#$E# & echo on & for %%b in (1) do rem"') do (
  set "DEL=%%a"
)
echo say the name of the colors, don't read

call :ColorText 0a "blue"
call :ColorText 0C "green"
call :ColorText 0b "red"
echo(
call :ColorText 19 "yellow"
call :ColorText 2F "black"
call :ColorText 4e "white"

goto :eof

:ColorText
echo off
<nul set /p ".=%DEL%" > "%~2"
findstr /v /a:%1 /R "^$" "%~2" nul
del "%~2" > nul 2>&1
goto :eof

It uses the color feature of the findstr command.

Findstr can be configured to output line numbers or filenames in a defined color.
So I first create a file with the text as filename, and the content is a single <backspace> character (ASCII 8).
Then I search all non empty lines in the file and in nul, so the filename will be output in the correct color appended with a colon, but the colon is immediatly removed by the <backspace>.

EDIT: One year later ... all characters are valid

@echo off
setlocal EnableDelayedExpansion
for /F "tokens=1,2 delims=#" %%a in ('"prompt #$H#$E# & echo on & for %%b in (1) do rem"') do (
  set "DEL=%%a"
)

rem Prepare a file "X" with only one dot
<nul > X set /p ".=."

call :color 1a "a"
call :color 1b "b"
call :color 1c "^!<>&| %%%%"*?"
exit /b

:color
set "param=^%~2" !
set "param=!param:"=\"!"
findstr /p /A:%1 "." "!param!\..\X" nul
<nul set /p ".=%DEL%%DEL%%DEL%%DEL%%DEL%%DEL%%DEL%"
exit /b

This uses the rule for valid path/filenames.
If a \..\ is in the path the prefixed elemet will be removed completly and it's not necessary that this element contains only valid filename characters.

Java, Shifting Elements in an Array

static void pushZerosToEnd(int arr[])
    {   int n = arr.length;
        int count = 0;  // Count of non-zero elements
        // Traverse the array. If element encountered is non-zero, then
        // replace the element at index 'count' with this element
        for (int i = 0; i < n; i++){
            if (arr[i] != 0)`enter code here`
               // arr[count++] = arr[i]; // here count is incremented
                swapNumbers(arr,count++,i);
        }
        for (int j = 0; j < n; j++){
            System.out.print(arr[j]+",");
        }
     }

    public static void swapNumbers(int [] arr, int pos1, int pos2){
        int temp  = arr[pos2];
        arr[pos2] = arr[pos1];
        arr[pos1] = temp;
    }

Send Mail to multiple Recipients in java

Hi every one this code is workin for me please try with this for sending mail to multiple recepients

private String recipient = "[email protected] ,[email protected] ";
String[] recipientList = recipient.split(",");
InternetAddress[] recipientAddress = new InternetAddress[recipientList.length];
int counter = 0;
for (String recipient : recipientList) {
    recipientAddress[counter] = new InternetAddress(recipient.trim());
    counter++;
}
message.setRecipients(Message.RecipientType.TO, recipientAddress);

Google access token expiration time

The spec says seconds:

http://tools.ietf.org/html/draft-ietf-oauth-v2-22#section-4.2.2

expires_in
    OPTIONAL.  The lifetime in seconds of the access token.  For
    example, the value "3600" denotes that the access token will
    expire in one hour from the time the response was generated.

I agree with OP that it's careless for Google to not document this.

How is the default submit button on an HTML form determined?

I had a form with 11 submit buttons on it, and it would always use the first submit button when the user pressed enter. I read elsewhere that it is not a good idea (bad practice) to have more than one submit button on a form, and the best way to do this is have the button you want as default, as the only submit button on the form. The other buttons should be made into "TYPE=BUTTON" and an onClick event added that calls your own submit routine in Javascript. Something like this :-

<SCRIPT Language="JavaScript">
function validform()
{
  // do whatever you need to validate the form, and return true or false accordingly
}

function mjsubmit()
{
  if (validform()) { document.form1.submit(); return true;}
  return false;
}
</SCRIPT>
<INPUT TYPE=BUTTON NAME="button1" VALUE="button1" onClick="document.form1.submitvalue='button1'; return mjsubmit();">
<INPUT TYPE=BUTTON NAME="button2" VALUE="button2" onClick="document.form1.submitvalue='button2'; return mjsubmit();">
<INPUT TYPE=SUBMIT NAME="button3" VALUE="button3" onClick="document.form1.submitvalue='button3'; return validform();">
<INPUT TYPE=BUTTON NAME="button4" VALUE="button4" onClick="document.form1.submitvalue='button4'; return mjsubmit();">

Here, button3 is the default, and although you are programmatically submitting the form with the other buttons, the mjsubmit routine validates them. HTH.

Print string to text file

With using pathlib module, indentation isn't needed.

import pathlib
pathlib.Path("output.txt").write_text("Purchase Amount: {}" .format(TotalAmount))

As of python 3.6, f-strings is available.

pathlib.Path("output.txt").write_text(f"Purchase Amount: {TotalAmount}")

Use nginx to serve static files from subdirectories of a given directory

It should work, however http://nginx.org/en/docs/http/ngx_http_core_module.html#alias says:

When location matches the last part of the directive’s value: it is better to use the root directive instead:

which would yield:

server {
  listen        8080;
  server_name   www.mysite.com mysite.com;
  error_log     /home/www-data/logs/nginx_www.error.log;
  error_page    404    /404.html;

  location /public/doc/ {
    autoindex on;
    root  /home/www-data/mysite;
  } 

  location = /404.html {
    root /home/www-data/mysite/static/html;
  }       
}

Programs & Examples On #Par

Reset par to the default values at startup

Executing <script> injected by innerHTML after AJAX call

Server cannot set status after HTTP headers have been sent IIS7.5

Visual Studio displaying errors even if projects build

Convert Unix timestamp to a date string

HTML5 form validation pattern alphanumeric with spaces?

What is the difference between And and AndAlso in VB.NET?

Gnuplot line types

Until version 4.6

Version 5.0

HashMap - getting First Key value

Using {% url ??? %} in django templates

Angular 2 Routing run in new tab

Remove padding or margins from Google Charts

How to add "class" to host element?

open cv error: (-215) scn == 3 || scn == 4 in function cvtColor

Difference between "read commited" and "repeatable read"

More elegant way of declaring multiple variables at the same time

Encrypt Password in Configuration Files?

How can I properly use a PDO object for a parameterized SELECT query

Duplicate ID, tag null, or parent id with another fragment for com.google.android.gms.maps.MapFragment

Gem Command not found

CSS: Position text in the middle of the page

Cannot assign requested address - possible causes?

Coerce multiple columns to factors at once

Sort an Array by keys based on another Array?

"The Controls collection cannot be modified because the control contains code blocks"

How to style the parent element when hovering a child element?

highlight the navigation menu for the current page

Search and get a line in Python

MemoryStream - Cannot access a closed Stream

How do you change Background for a Button MouseOver in WPF?

Why does 'git commit' not save my changes?

convert string array to string

Java: Clear the console

How can I let a user download multiple files when a button is clicked?

Check if directory mounted with bash

How to do a FULL OUTER JOIN in MySQL?

git: fatal: Could not read from remote repository

How to force page refreshes or reloads in jQuery?

What is __future__ in Python used for and how/when to use it, and how it works

nested_scopes

generators

division

absolute_import

with_statement

generator_stop

References

Disable clipboard prompt in Excel VBA on workbook close

DB2 Query to retrieve all table names for a given schema

Configuration System Failed to Initialize

How to pass a parameter to Vue @click event handler

Does JavaScript have a built in stringbuilder class?

How to pause javascript code execution for 2 seconds

The service cannot accept control messages at this time

How to update column value in laravel

How can I convert a string to upper- or lower-case with XSLT?

PHP read and write JSON from file

Attach a body onload event with JS

How to access to a child method from the parent in vue.js

UIAlertView first deprecated IOS 9

Xcode 8 + Swift

Is there a way to pass optional parameters to a function?

Rounding a variable to two decimal places C#

jQuery UI " $("#datepicker").datepicker is not a function"

How to import JsonConvert in C# application?

Using Laravel Homestead: 'no input file specified'

Why does this iterative list-growing code give IndexError: list assignment index out of range?

Use string contains function in oracle SQL query

Is there a way to continue broken scp (secure copy) command process in Linux?

Animate element to auto height with jQuery

Setting Java heap space under Maven 2 on Windows

How to plot a function curve in R

jQuery function after .append

insert echo into the specific html element like div which has an id or class

Change selected value of kendo ui dropdownlist

Running Facebook application on localhost

Chrome DevTools Devices does not detect device when plugged in

cast_sender.js error: Failed to load resource: net::ERR_FAILED in Chrome

What is future in Python used for and how/when to use it, and how it works

`nested_scopes`

`generators`

`division`

`absolute_import`

`with_statement`

`generator_stop`

TypeError: module.init() takes at most 2 arguments (3 given)