#Iso8583 | Programs & Examples on Iso8583

If input field is empty, disable submit button

Please try this

<!DOCTYPE html>
<html>
  <head>
    <title>Jquery</title>
    <meta charset="utf-8">       
    <script src='http://code.jquery.com/jquery-1.7.1.min.js'></script>
  </head>

  <body>

    <input type="text" id="message" value="" />
    <input type="button" id="sendButton" value="Send">

    <script>
    $(document).ready(function(){  

      var checkField;

      //checking the length of the value of message and assigning to a variable(checkField) on load
      checkField = $("input#message").val().length;  

      var enableDisableButton = function(){         
        if(checkField > 0){
          $('#sendButton').removeAttr("disabled");
        } 
        else {
          $('#sendButton').attr("disabled","disabled");
        }
      }        

      //calling enableDisableButton() function on load
      enableDisableButton();            

      $('input#message').keyup(function(){ 
        //checking the length of the value of message and assigning to the variable(checkField) on keyup
        checkField = $("input#message").val().length;
        //calling enableDisableButton() function on keyup
        enableDisableButton();
      });
    });
    </script>
  </body>
</html>

How to get row number from selected rows in Oracle

The below query helps to get the row number in oracle,

SELECT ROWNUM AS SNO,ID,NAME,EMAIL,BRANCH FROM student WHERE NAME LIKE '%ram%';

How to add a response header on nginx when using proxy_pass?

Hide response header and then add a new custom header value

Adding a header with add_header works fine with proxy pass, but if there is an existing header value in the response it will stack the values.

If you want to set or replace a header value (for example replace the Access-Control-Allow-Origin header to match your client for allowing cross origin resource sharing) then you can do as follows:

# 1. hide the Access-Control-Allow-Origin from the server response
proxy_hide_header Access-Control-Allow-Origin;
# 2. add a new custom header that allows all * origins instead
add_header Access-Control-Allow-Origin *;

So proxy_hide_header combined with add_header gives you the power to set/replace response header values.

Similar answer can be found here on ServerFault

UPDATE:

Note: proxy_set_header is for setting request headers before the request is sent further, not for setting response headers (these configuration attributes for headers can be a bit confusing).

How to run html file using node js

I too faced such scenario where I had to run a web app in nodejs with index.html being the entry point. Here is what I did:

run node init in root of app (this will create a package.json file)
install express in root of app : npm install --save express (save will update package.json with express dependency)
create a public folder in root of your app and put your entry point file (index.html) and all its dependent files (this is just for simplification, in large application this might not be a good approach).
Create a server.js file in root of app where in we will use express module of node which will serve the public folder from its current directory.

server.js

var express = require('express');
var app = express();
app.use(express.static(__dirname + '/public')); //__dir and not _dir
var port = 8000; // you can use any port
app.listen(port);
console.log('server on' + port);

do node server : it should output "server on 8000"
start http://localhost:8000/ : your index.html will be called

File Structure would be something similar

Angular 4 - Select default value in dropdown [Reactive Forms]

You have to create a new property (ex:selectedCountry) and should use it in [(ngModel)] and further in component file assign default value to it.

In your_component_file.ts

this.selectedCountry = default;

In your_component_template.html

<select id="country" formControlName="country" [(ngModel)]="selectedCountry">
 <option *ngFor="let c of countries" [value]="c" >{{ c }}</option>
</select>

Plunker link

What is the meaning of prepended double colon "::"?

:: is used to link something ( a variable, a function, a class, a typedef etc...) to a namespace, or to a class.

if there is no left hand side before ::, then it underlines the fact you are using the global namespace.

e.g.:

::doMyGlobalFunction();

How to filter data in dataview

Eg:

Datatable newTable =  new DataTable();

            foreach(string s1 in list)
            {
                if (s1 != string.Empty) {
                    dvProducts.RowFilter = "(CODE like '" + serachText + "*') AND (CODE <> '" + s1 + "')";
                    foreach(DataRow dr in dvProducts.ToTable().Rows)
                    {
                       newTable.ImportRow(dr);
                    }
                }
            }
ListView1.DataSource = newTable;
ListView1.DataBind();

How to concatenate strings with padding in sqlite

SQLite has a printf function which does exactly that:

SELECT printf('%s-%.2d-%.4d', col1, col2, col3) FROM mytable

Illegal pattern character 'T' when parsing a date string to java.util.Date

There are two answers above up-to-now and they are both long (and tl;dr too short IMHO), so I write summary from my experience starting to use new java.time library (applicable as noted in other answers to Java version 8+). ISO 8601 sets standard way to write dates: YYYY-MM-DD so the format of date-time is only as below (could be 0, 3, 6 or 9 digits for milliseconds) and no formatting string necessary:

import java.time.Instant;
public static void main(String[] args) {
    String date="2010-10-02T12:23:23Z";
    try {
        Instant myDate = Instant.parse(date);
    } catch (ParseException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

I did not need it, but as getting year is in code from the question, then:
it is trickier, cannot be done from Instant directly, can be done via Calendar in way of questions Get integer value of the current year in Java and Converting java.time to Calendar but IMHO as format is fixed substring is more simple to use:

myDate.toString().substring(0,4);

How to put two divs side by side

This will work

<div style="width:800px;">
  <div style="width:300px; float:left;"></div>
  <div style="width:300px; float:right;"></div>
</div>
<div style="clear: both;"></div>

remove first element from array and return the array minus the first element

You can use array.slice(0,1) // First index is removed and array is returned.

How to unbind a listener that is calling event.preventDefault() (using jQuery)?

$('#my_elementtt').click(function(event){
    trigger('click');
});

return string with first match Regex

You could embed the '' default in your regex by adding |$:

>>> re.findall('\d+|$', 'aa33bbb44')[0]
'33'
>>> re.findall('\d+|$', 'aazzzbbb')[0]
''
>>> re.findall('\d+|$', '')[0]
''

Also works with re.search pointed out by others:

>>> re.search('\d+|$', 'aa33bbb44').group()
'33'
>>> re.search('\d+|$', 'aazzzbbb').group()
''
>>> re.search('\d+|$', '').group()
''

Remove last character from C++ string

int main () {

  string str1="123";
  string str2 = str1.substr (0,str1.length()-1);

  cout<<str2; // output: 12

  return 0;
}

How to change options of <select> with jQuery?

Removing and adding DOM element is slower than modification of existing one.

If your option sets have same length, you may do something like this:

$('#my-select option')
.each(function(index) {
    $(this).text('someNewText').val('someNewValue');
});

In case your new option set has different length, you may delete/add empty options you really need, using some technique described above.

Spring 3 MVC resources and tag <mvc:resources />

You can keep rsouces directory in Directory NetBeans: Web Pages Eclipse: webapps

File: dispatcher-servlet.xml

<?xml version='1.0' encoding='UTF-8' ?>
<!-- was: <?xml version="1.0" encoding="UTF-8"?> -->
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:p="http://www.springframework.org/schema/p"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
       http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
       http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
       http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
       http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">

    <context:component-scan base-package="controller" />

    <bean id="viewResolver"
          class="org.springframework.web.servlet.view.InternalResourceViewResolver"
          p:prefix="/WEB-INF/jsp/"
          p:suffix=".jsp" />

    <mvc:resources location="/resources/theme_name/" mapping="/resources/**"  cache-period="10000"/>
    <mvc:annotation-driven/>

</beans>

File: web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>/WEB-INF/applicationContext.xml</param-value>
    </context-param>
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <servlet>
        <servlet-name>dispatcher</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <load-on-startup>2</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>dispatcher</servlet-name>
        <url-pattern>*.htm</url-pattern>
        <url-pattern>*.css</url-pattern>
        <url-pattern>*.js</url-pattern>
    </servlet-mapping>
    <session-config>
        <session-timeout>
            30
        </session-timeout>
    </session-config>
    <welcome-file-list>
        <welcome-file>redirect.jsp</welcome-file>
    </welcome-file-list>
</web-app>

In JSP File

<link href="<c:url value="/resources/css/default.css"/>" rel="stylesheet" type="text/css"/>

assignment operator overloading in c++

Under the circumstances, you're almost certainly better off skipping the check for self-assignment -- when you're only assigning one member that seems to be a simple type (probably a double), it's generally faster to do that assignment than avoid it, so you'd end up with:

SimpleCircle & SimpleCircle::operator=(const SimpleCircle & rhs)
{
    itsRadius = rhs.getRadius(); // or just `itsRadius = rhs.itsRadius;`
    return *this;
}

I realize that many older and/or lower quality books advise checking for self assignment. At least in my experience, however, it's sufficiently rare that you're better off without it (and if the operator depends on it for correctness, it's almost certainly not exception safe).

As an aside, I'd note that to define a circle, you generally need a center and a radius, and when you copy or assign, you want to copy/assign both.

Deleting DataFrame row in Pandas based on column value

Just adding another way for DataFrame expanded over all columns:

for column in df.columns:
   df = df[df[column]!=0]

Example:

def z_score(data,count):
   threshold=3
   for column in data.columns:
       mean = np.mean(data[column])
       std = np.std(data[column])
       for i in data[column]:
           zscore = (i-mean)/std
           if(np.abs(zscore)>threshold):
               count=count+1
               data = data[data[column]!=i]
   return data,count

Uninstall Django completely

Got it solved. I missed to delete the egg_info files of all previous Django versions. Removed them from /usr/local/lib/python2.7/dist-packages. Also from /usr/lib/python2.7/dist-packages (if any present here)

sudo pip freeze| grep Django
sudo pip show -f Django
sudo pip search Django | more +/^Django

All above commands should not show Django version to verify clean uninstallation.

Plot a legend outside of the plotting area in base graphics?

Try layout() which I have used for this in the past by simply creating an empty plot below, properly scaled at around 1/4 or so and placing the legend parts manually in it.

There are some older questions here about legend() which should get you started.

Serialize and Deserialize Json and Json Array in Unity

You can use Newtonsoft.Json just add Newtonsoft.dll to your project and use below script

using System;
using Newtonsoft.Json;
using UnityEngine;

public class NewBehaviourScript : MonoBehaviour
{

    [Serializable]
    public class Person
    {
        public string id;
        public string name;
    }
    public Person[] person;

    private void Start()
    {
       var myjson = JsonConvert.SerializeObject(person);

        print(myjson);

    }
}

another solution is using JsonHelper

using System;
using Newtonsoft.Json;
using UnityEngine;

public class NewBehaviourScript : MonoBehaviour
{

    [Serializable]
    public class Person
    {
        public string id;
        public string name;
    }
    public Person[] person;

    private void Start()
    {
        var myjson = JsonHelper.ToJson(person);

        print(myjson);

    }
}

How can I determine the character encoding of an excel file?

For Excel 2010 it should be UTF-8. Instruction by MS :
http://msdn.microsoft.com/en-us/library/bb507946:

"The basic document structure of a SpreadsheetML document consists of the Sheets and Sheet elements, which reference the worksheets in the Workbook. A separate XML file is created for each Worksheet. For example, the SpreadsheetML for a workbook that has two worksheets name MySheet1 and MySheet2 is located in the Workbook.xml file and is shown in the following code example.

<?xml version="1.0" encoding="UTF-8" standalone="yes" ?> 
<workbook xmlns=http://schemas.openxmlformats.org/spreadsheetml/2006/main xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships">
    <sheets>
        <sheet name="MySheet1" sheetId="1" r:id="rId1" /> 
        <sheet name="MySheet2" sheetId="2" r:id="rId2" /> 
    </sheets>
</workbook>

The worksheet XML files contain one or more block level elements such as SheetData. sheetData represents the cell table and contains one or more Row elements. A row contains one or more Cell elements. Each cell contains a CellValue element that represents the value of the cell. For example, the SpreadsheetML for the first worksheet in a workbook, that only has the value 100 in cell A1, is located in the Sheet1.xml file and is shown in the following code example.

<?xml version="1.0" encoding="UTF-8" ?> 
<worksheet xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main">
    <sheetData>
        <row r="1">
            <c r="A1">
                <v>100</v> 
            </c>
        </row>
    </sheetData>
</worksheet>

Detection of cell encodings:

https://metacpan.org/pod/Spreadsheet::ParseExcel::Cell

http://forums.asp.net/t/1608228.aspx/1

How to localise a string inside the iOS info.plist file?

In my case the localization not worked cause of '-' symbol in the name. Example: "aero-Info.plist" And localized files: "aero-InfoPlist.strings" and "aeroInfoPlist.strings" did not work.

Adding an onclick function to go to url in JavaScript?

Not completely sure I understand the question, but do you mean something like this?

$('#something').click(function() { 
    document.location = 'http://somewhere.com/';
} );

How to convert a 3D point into 2D perspective projection?

Looking at the screen from the top, you get x and z axis.
Looking at the screen from the side, you get y and z axis.

Calculate the focal lengths of the top and side views, using trigonometry, which is the distance between the eye and the middle of the screen, which is determined by the field of view of the screen. This makes the shape of two right triangles back to back.

hw = screen_width / 2

hh = screen_height / 2

fl_top = hw / tan(?/2)

fl_side = hh / tan(?/2)

Then take the average focal length.

fl_average = (fl_top + fl_side) / 2

Now calculate the new x and new y with basic arithmetic, since the larger right triangle made from the 3d point and the eye point is congruent with the smaller triangle made by the 2d point and the eye point.

x' = (x * fl_top) / (z + fl_top)

y' = (y * fl_top) / (z + fl_top)

Or you can simply set

x' = x / (z + 1)

and

y' = y / (z + 1)

How do I use ROW_NUMBER()?

This query:

SELECT ROW_NUMBER() OVER(ORDER BY UserId) From Users WHERE UserName='Joe'

will return all rows where the UserName is 'Joe' UNLESS you have no UserName='Joe'

They will be listed in order of UserID and the row_number field will start with 1 and increment however many rows contain UserName='Joe'

If it does not work for you then your WHERE command has an issue OR there is no UserID in the table. Check spelling for both fields UserID and UserName.

Adding Text to DataGridView Row Header

You don't have to use the RowValidated event, that's just the one I used for a little test app to make sure this worked, but this will set the row (not column) header text to whatever year you specify.

It would probably go better in the CellFormatting event, actually.

    private void dataGridView_RowValidated(object sender, DataGridViewCellEventArgs e)
    {
        DataGridView gridView = sender as DataGridView;

        if (null != gridView)
        {
            gridView.Rows[e.RowIndex].HeaderCell.Value = "2009";
        }
    }

EDIT: Here's the entire TestForm I used, as simple as possible to demonstrate the solution. Make sure your RowHeadersWidth is wide enough to display the text.

#region

using System.ComponentModel;
using System.Windows.Forms;

#endregion

namespace DataGridViewTest
{
    public class GridTest : Form
    {
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private IContainer components;

        private DataGridView dataGridView1;
        private DataGridViewTextBoxColumn Month;

        public GridTest()
        {
            InitializeComponent();
        }

        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        private void dataGridView_RowValidated(object sender, DataGridViewCellEventArgs e)
        {
            DataGridView gridView = sender as DataGridView;

            if (null != gridView)
            {
                gridView.Rows[e.RowIndex].HeaderCell.Value = "2009";
            }
        }

        #region Windows Form Designer generated code

        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.dataGridView1 = new System.Windows.Forms.DataGridView();
            this.Month = new System.Windows.Forms.DataGridViewTextBoxColumn();
            ((System.ComponentModel.ISupportInitialize) (this.dataGridView1)).BeginInit();
            this.SuspendLayout();
            // 
            // dataGridView1
            // 
            this.dataGridView1.AutoSizeColumnsMode = System.Windows.Forms.DataGridViewAutoSizeColumnsMode.Fill;
            this.dataGridView1.ColumnHeadersHeightSizeMode =
                System.Windows.Forms.DataGridViewColumnHeadersHeightSizeMode.AutoSize;
            this.dataGridView1.Columns.AddRange(new System.Windows.Forms.DataGridViewColumn[]
                                                    {
                                                        this.Month
                                                    });
            this.dataGridView1.Dock = System.Windows.Forms.DockStyle.Fill;
            this.dataGridView1.Location = new System.Drawing.Point(0, 0);
            this.dataGridView1.Name = "dataGridView1";
            this.dataGridView1.RowHeadersWidth = 100;
            this.dataGridView1.Size = new System.Drawing.Size(745, 532);
            this.dataGridView1.TabIndex = 0;
            this.dataGridView1.RowValidated +=
                new System.Windows.Forms.DataGridViewCellEventHandler(this.dataGridView_RowValidated);
            // 
            // Month
            // 
            this.Month.HeaderText = "Month";
            this.Month.Name = "Month";
            // 
            // Form1
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(745, 532);
            this.Controls.Add(this.dataGridView1);
            this.Name = "Form1";
            this.Text = "Form1";
            ((System.ComponentModel.ISupportInitialize) (this.dataGridView1)).EndInit();
            this.ResumeLayout(false);
        }

        #endregion
    }
}

Understanding INADDR_ANY for socket programming

INADDR_ANY instructs listening socket to bind to all available interfaces. It's the same as trying to bind to inet_addr("0.0.0.0"). For completeness I'll also mention that there is also IN6ADDR_ANY_INIT for IPv6 and it's the same as trying to bind to :: address for IPv6 socket.

#include <netinet/in.h>

struct in6_addr addr = IN6ADDR_ANY_INIT;

Also, note that when you bind IPv6 socket to to IN6ADDR_ANY_INIT your socket will bind to all IPv6 interfaces, and should be able to accept connections from IPv4 clients as well (though IPv6-mapped addresses).

BarCode Image Generator in Java

There is also this free API that you can use to make free barcodes in java.

Barbecue

Filtering DataSet

You can use DataTable.Select:

var strExpr = "CostumerID = 1 AND OrderCount > 2";
var strSort = "OrderCount DESC";

// Use the Select method to find all rows matching the filter.
foundRows = ds.Table[0].Select(strExpr, strSort);

Or you can use DataView:

ds.Tables[0].DefaultView.RowFilter = strExpr;

UPDATE I'm not sure why you want to have a DataSet returned. But I'd go with the following solution:

var dv = ds.Tables[0].DefaultView;
dv.RowFilter = strExpr;
var newDS = new DataSet();
var newDT = dv.ToTable();
newDS.Tables.Add(newDT);

Reverting to a specific commit based on commit id with Git?

If you want to force the issue, you can do:

git reset --hard c14809fafb08b9e96ff2879999ba8c807d10fb07

send you back to how your git clone looked like at the time of the checkin

With block equivalent in C#?

As the Visual C# Program Manager linked above says, there are limited situations where the With statement is more efficient, the example he gives when it is being used as a shorthand to repeatedly access a complex expression.

Using an extension method and generics you can create something that is vaguely equivalent to a With statement, by adding something like this:

    public static T With<T>(this T item, Action<T> action)
    {
        action(item);
        return item;
    }

Taking a simple example of how it could be used, using lambda syntax you can then use it to change something like this:

    updateRoleFamily.RoleFamilyDescription = roleFamilyDescription;
    updateRoleFamily.RoleFamilyCode = roleFamilyCode;

To this:

    updateRoleFamily.With(rf =>
          {
              rf.RoleFamilyDescription = roleFamilyDescription;
              rf.RoleFamilyCode = roleFamilyCode;
          });

On an example like this, the only advantage is perhaps a nicer layout, but with a more complex reference and more properties, it could well give you more readable code.

How do I upload a file with the JS fetch API?

If you want multiple files, you can use this

var input = document.querySelector('input[type="file"]')

var data = new FormData()
for (const file of input.files) {
  data.append('files',file,file.name)
}

fetch('/avatars', {
  method: 'POST',
  body: data
})

How to find all trigger associated with a table with SQL Server?

This might be useful

SELECT 
 t.name AS TableName,
 tr.name AS TriggerName  
FROM sys.triggers tr
INNER JOIN sys.tables t ON t.object_id = tr.parent_id
WHERE 
t.name in ('TABLE_NAME(S)_GOES_HERE');

This way you just have to plugin the name of tables and the query will fetch all the triggers you need

How to get a context in a recycler view adapter

Short answer:

Context context;

@Override
public void onAttachedToRecyclerView(RecyclerView recyclerView) {
    super.onAttachedToRecyclerView(recyclerView);
    context = recyclerView.getContext();
}

Explanation why other answers are not great:

Passing Context to the adapter is completely unnecessary, since RecyclerView you can access it from inside the class
Obtaining Context at ViewHolder level means that you do it every time you bind or create a ViewHolder. You duplicate operations.
I don't think you need to worry about any memory leak. If your adapter lingers outside your Activity lifespan (which would be weird) then you already have a leak.

"Templates can be used only with field access, property access, single-dimension array index, or single-parameter custom indexer expressions" error

The ...For extension methods on the HtmlHelper (e.g., DisplayFor, TextBoxFor, ElementFor, etc...) take a property and nothing else. If you don't have a property, use the non-For method (e.g., Display, TextBox, Element, etc...).

The ...For extension methods provides a way of simplifying postback by naming the control after the property. This is why it takes an expression and not simply a value. If you are not interested in this postback facilitation then do not use the ...For methods at all.

Note: You should not be doing things like calling ToString inside the view. This should be done inside the view model. I realize that a lot of demo projects put domain objects straight into the view. In my experience, this rarely works because it assumes that you do not want any formatting on the data in the domain entity. Best practice is to create a view model that wraps the entity into something that can be directly consumed by the view. Most of the properties in this view model should be strings that are already formatted or data for which you have element or display templates created.

How to share data between different threads In C# using AOP?

When you start a thread you are executing a method of some chosen class. All attributes of that class are visible.

  Worker myWorker = new Worker( /* arguments */ );

  Thread myThread = new Thread(new ThreadStart(myWorker.doWork));

  myThread.Start();

Your thread is now in the doWork() method and can see any atrributes of myWorker, which may themselves be other objects. Now you just need to be careful to deal with the cases of having several threads all hitting those attributes at the same time.

How to make 'submit' button disabled?

Here is a working example (you'll have to trust me that there's a submit() method on the controller - it prints an Object, like {user: 'abc'} if 'abc' is entered in the input field):

<form #loginForm="ngForm" (ngSubmit)="submit(loginForm.value)">
    <input type="text" name="user" ngModel required>
    <button  type="submit"  [disabled]="loginForm.invalid">
        Submit
    </button>
</form>

As you can see:

don't use loginForm.form, just use loginForm
loginForm.invalid works as well as !loginForm.valid
if you want submit() to be passed the correct value(s), the input element should have name and ngModel attributes

Also, this is when you're NOT using the new FormBuilder, which I recommend. Things are very different when using FormBuilder.

Get the time of a datetime using T-SQL?

CAST(CONVERT(CHAR(8),GETUTCDATE(),114) AS DATETIME)

IN SQL Server 2008+

CAST(GETUTCDATE() AS TIME)

How to replace multiple patterns at once with sed?

Here is a variation on ooga's answer that works for multiple search and replace pairs without having to check how values might be reused:

sed -i '
s/\bAB\b/________BC________/g
s/\bBC\b/________CD________/g
s/________//g
' path_to_your_files/*.txt

Here is an example:

before:

some text AB some more text "BC" and more text.

after:

some text BC some more text "CD" and more text.

Note that \b denotes word boundaries, which is what prevents the ________ from interfering with the search (I'm using GNU sed 4.2.2 on Ubuntu). If you are not using a word boundary search, then this technique may not work.

Also note that this gives the same results as removing the s/________//g and appending && sed -i 's/________//g' path_to_your_files/*.txt to the end of the command, but doesn't require specifying the path twice.

A general variation on this would be to use \x0 or _\x0_ in place of ________ if you know that no nulls appear in your files, as jthill suggested.

Git merge without auto commit

You're misunderstanding the meaning of the merge here.

The --no-commit prevents the MERGE COMMIT from occuring, and that only happens when you merge two divergent branch histories; in your example that's not the case since Git indicates that it was a "fast-forward" merge and then Git only applies the commits already present on the branch sequentially.

Select multiple value in DropDownList using ASP.NET and C#

Take a look at the ListBox control to allow multi-select.

<asp:ListBox runat="server" ID="lblMultiSelect" SelectionMode="multiple">
            <asp:ListItem Text="opt1" Value="opt1" />
            <asp:ListItem Text="opt2" Value="opt2" />
            <asp:ListItem Text="opt3" Value="opt3" />
</asp:ListBox>

in the code behind

foreach(ListItem listItem in lblMultiSelect.Items)
    {
       if (listItem.Selected)
       {
          var val = listItem.Value;
          var txt = listItem.Text; 
       }
    }

I can not find my.cnf on my windows computer

Windows 7 location is: C:\Users\All Users\MySQL\MySQL Server 5.5\my.ini

For XP may be: C:\Documents and Settings\All Users\MySQL\MySQL Server 5.5\my.ini

At the tops of these files are comments defining where my.cnf can be found.

Push local Git repo to new remote including all branches and tags

To push all your branches, use either (replace REMOTE with the name of the remote, for example "origin"):

git push REMOTE '*:*'
git push REMOTE --all

To push all your tags:

git push REMOTE --tags

Finally, I think you can do this all in one command with:

git push REMOTE --mirror

However, in addition --mirror, will also push your remotes, so this might not be exactly what you want.

nginx - nginx: [emerg] bind() to [::]:80 failed (98: Address already in use)

i fixed this by running sudo apachectl stop - turns out apache was running in the background and prevented nginx from starting on the desired port.

On ubuntu run sudo /etc/init.d/apache2 stop

HTTP response code for POST when resource already exists

I know it's been ages but I will leave an answer here which I see fit.

I think the best will be to use HTTP_306_RESERVED.

C# version of java's synchronized keyword?

You can use the lock statement instead. I think this can only replace the second version. Also, remember that both synchronized and lock need to operate on an object.

How to form tuple column from two columns in Pandas

Pandas has the itertuples method to do exactly this:

list(df[['lat', 'long']].itertuples(index=False, name=None))

What is the best Java library to use for HTTP POST, GET etc.?

I'm somewhat partial to Jersey. We use 1.10 in all our projects and haven't run into an issue we couldn't solve with it.

Some reasons why I like it:

Providers - created soap 1.1/1.2 providers in Jersey and have eliminated the need to use the bulky AXIS for our JAX-WS calls
Filters - created database logging filters to log the entire request (including the request/response headers) while preventing logging of sensitive information.
JAXB - supports marshaling to/from objects straight from the request/response
API is easy to use

In truth, HTTPClient and Jersey are very similar in implementation and API. There is also an extension for Jersey that allows it to support HTTPClient.

Some code samples with Jersey 1.x: https://blogs.oracle.com/enterprisetechtips/entry/consuming_restful_web_services_with

http://www.mkyong.com/webservices/jax-rs/restful-java-client-with-jersey-client/

HTTPClient with Jersey Client: https://blogs.oracle.com/PavelBucek/entry/jersey_client_apache_http_client

SyntaxError: missing ; before statement

Or you might have something like this (redeclaring a variable):

var data = [];
var data =

Default Xmxsize in Java 8 (max heap size)

On my Ubuntu VM, with 1048 MB total RAM, java -XX:+PrintFlagsFinal -version | grep HeapSize printed : uintx MaxHeapSize := 266338304, which is approx 266MB and is 1/4th of my total RAM.

/usr/bin/ld: cannot find

@Alwin Doss You should provide the -L option before -l. You would have done the other way round probably. Try this :)

The difference between fork(), vfork(), exec() and clone()

vfork() is an obsolete optimization. Before good memory management, fork() made a full copy of the parent's memory, so it was pretty expensive. since in many cases a fork() was followed by exec(), which discards the current memory map and creates a new one, it was a needless expense. Nowadays, fork() doesn't copy the memory; it's simply set as "copy on write", so fork()+exec() is just as efficient as vfork()+exec().
clone() is the syscall used by fork(). with some parameters, it creates a new process, with others, it creates a thread. the difference between them is just which data structures (memory space, processor state, stack, PID, open files, etc) are shared or not.

Go to URL after OK button if alert is pressed

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

I just met the same issue and see this post. For me it's because I forgot the set the identifier of cell, also as mentioned in other answers. What I want to say is that if you are using the storyboard to load custom cell we don't need to register the table view cell in code, which can cause other problems.

See this post for detail:

Custom table view cell: IBOutlet label is nil

Removing viewcontrollers from navigation stack

Use this code and enjoy:

NSMutableArray *navigationArray = [[NSMutableArray alloc] initWithArray: self.navigationController.viewControllers];

// [navigationArray removeAllObjects];    // This is just for remove all view controller from navigation stack.
[navigationArray removeObjectAtIndex: 2];  // You can pass your index here
self.navigationController.viewControllers = navigationArray;
[navigationArray release];

Hope this will help you.

Edit: Swift Code

guard let navigationController = self.navigationController else { return }
var navigationArray = navigationController.viewControllers // To get all UIViewController stack as Array
navigationArray.remove(at: navigationArray.count - 2) // To remove previous UIViewController
self.navigationController?.viewControllers = navigationArray

Edit: To remove all ViewController except last one -> no Back Button in the upper left corner

guard let navigationController = self.navigationController else { return }
var navigationArray = navigationController.viewControllers // To get all UIViewController stack as Array
let temp = navigationArray.last
navigationArray.removeAll()
navigationArray.append(temp!) //To remove all previous UIViewController except the last one
self.navigationController?.viewControllers = navigationArray

Angular ng-repeat add bootstrap row every 3 or 4 cols

This worked for me, no splicing or anything required:

HTML

<div class="row" ng-repeat="row in rows() track by $index">
    <div class="col-md-3" ng-repeat="item in items" ng-if="indexInRange($index,$parent.$index)"></div>
</div>

JavaScript

var columnsPerRow = 4;
$scope.rows = function() {
  return new Array(columnsPerRow);
};
$scope.indexInRange = function(columnIndex,rowIndex) {
  return columnIndex >= (rowIndex * columnsPerRow) && columnIndex < (rowIndex * columnsPerRow) + columnsPerRow;
};

Change border color on <select> HTML form

As Diodeus stated, IE doesn't allow anything but the default border for <select> elements. However, I know of two hacks to achieve a similar effect :

Use a DIV that is placed absolutely at the same position as the dropdown and set it's borders. It will appear that the dropdown has a border.
Use a Javascript solution, for instance, the one provided here.

It may however prove to be too much effort, so you should evaluate if you really require the border.

How to get the IP address of the server on which my C# application is running on?

Nope, that is pretty much the best way to do it. As a machine could have several IP addresses you need to iterate the collection of them to find the proper one.

Edit: The only thing I would change would be to change this:

if (ip.AddressFamily.ToString() == "InterNetwork")

to this:

if (ip.AddressFamily == AddressFamily.InterNetwork)

There is no need to ToString an enumeration for comparison.

PHP calculate age

here's the simple function to calculate age:

<?php
    function age($birthDate){
      //date in mm/dd/yyyy format; or it can be in other formats as well
      //explode the date to get month, day and year
      $birthDate = explode("/", $birthDate);
      //get age from date or birthdate
      $age = (date("md", date("U", mktime(0, 0, 0, $birthDate[0], $birthDate[1], $birthDate[2]))) > date("md")
        ? ((date("Y") - $birthDate[2]) - 1)
        : (date("Y") - $birthDate[2]));
     return $age;
    }

    ?>

    <?php
    echo age('11/05/1991');
    ?>

How does OkHttp get Json string?

As I observed in my code. If once the value is fetched of body from Response, its become blank.

String str = response.body().string();  // {response:[]}

String str1  = response.body().string();  // BLANK

So I believe after fetching once the value from body, it become empty.

Suggestion : Store it in String, that can be used many time.

What is meant with "const" at end of function declaration?

A "const function", denoted with the keyword const after a function declaration, makes it a compiler error for this class function to change a member variable of the class. However, reading of a class variables is okay inside of the function, but writing inside of this function will generate a compiler error.

Another way of thinking about such "const function" is by viewing a class function as a normal function taking an implicit this pointer. So a method int Foo::Bar(int random_arg) (without the const at the end) results in a function like int Foo_Bar(Foo* this, int random_arg), and a call such as Foo f; f.Bar(4) will internally correspond to something like Foo f; Foo_Bar(&f, 4). Now adding the const at the end (int Foo::Bar(int random_arg) const) can then be understood as a declaration with a const this pointer: int Foo_Bar(const Foo* this, int random_arg). Since the type of this in such case is const, no modifications of member variables are possible.

It is possible to loosen the "const function" restriction of not allowing the function to write to any variable of a class. To allow some of the variables to be writable even when the function is marked as a "const function", these class variables are marked with the keyword mutable. Thus, if a class variable is marked as mutable, and a "const function" writes to this variable then the code will compile cleanly and the variable is possible to change. (C++11)

As usual when dealing with the const keyword, changing the location of the const key word in a C++ statement has entirely different meanings. The above usage of const only applies when adding const to the end of the function declaration after the parenthesis.

const is a highly overused qualifier in C++: the syntax and ordering is often not straightforward in combination with pointers. Some readings about const correctness and the const keyword:

Const correctness

The C++ 'const' Declaration: Why & How

How to detect if user select cancel InputBox VBA Excel

Following example uses InputBox method to validate user entry to unhide sheets: Important thing here is to use wrap InputBox variable inside StrPtr so it could be compared to '0' when user chose to click 'x' icon on the InputBox.

Sub unhidesheet()

Dim ws As Worksheet
Dim pw As String

pw = InputBox("Enter Password to Unhide Sheets:", "Unhide Data Sheets")
If StrPtr(pw) = 0 Then

   Exit Sub
ElseIf pw = NullString Then
   Exit Sub
ElseIf pw = 123456 Then
    For Each ws In ThisWorkbook.Worksheets
        ws.Visible = xlSheetVisible
    Next
End If
End Sub

Full examples of using pySerial package

Blog post Serial RS232 connections in Python

import time
import serial

# configure the serial connections (the parameters differs on the device you are connecting to)
ser = serial.Serial(
    port='/dev/ttyUSB1',
    baudrate=9600,
    parity=serial.PARITY_ODD,
    stopbits=serial.STOPBITS_TWO,
    bytesize=serial.SEVENBITS
)

ser.isOpen()

print 'Enter your commands below.\r\nInsert "exit" to leave the application.'

input=1
while 1 :
    # get keyboard input
    input = raw_input(">> ")
        # Python 3 users
        # input = input(">> ")
    if input == 'exit':
        ser.close()
        exit()
    else:
        # send the character to the device
        # (note that I happend a \r\n carriage return and line feed to the characters - this is requested by my device)
        ser.write(input + '\r\n')
        out = ''
        # let's wait one second before reading output (let's give device time to answer)
        time.sleep(1)
        while ser.inWaiting() > 0:
            out += ser.read(1)

        if out != '':
            print ">>" + out

Flutter: Run method on Widget build complete

UPDATE: Flutter v1.8.4

Both mentioned codes are working now:

Working:

WidgetsBinding.instance
        .addPostFrameCallback((_) => yourFunction(context));

Working

import 'package:flutter/scheduler.dart';

SchedulerBinding.instance.addPostFrameCallback((_) => yourFunction(context));

String to date in Oracle with milliseconds

I don't think you can use fractional seconds with to_date or the DATE type in Oracle. I think you need to_timestamp which returns a TIMESTAMP type.

Recursive sub folder search and return files in a list python

You can use the "recursive" setting within glob module to search through subdirectories

For example:

import glob
glob.glob('//Mypath/folder/**/*',recursive = True)

The second line would return all files within subdirectories for that folder location (Note, you need the '**/*' string at the end of your folder string to do this.)

If you specifically wanted to find text files deep within your subdirectories, you can use

glob.glob('//Mypath/folder/**/*.txt',recursive = True)

Pointtype command for gnuplot

You first have to tell Gnuplot to use a style that uses points, e.g. with points or with linespoints. Try for example:

plot sin(x) with points

Output:

Now try:

plot sin(x) with points pointtype 5

Output:

You may also want to look at the output from the test command which shows you the capabilities of the current terminal. Here are the capabilities for my pngairo terminal:

Call to undefined function curl_init().?

The CURL extension ext/curl is not installed or enabled in your PHP installation. Check the manual for information on how to install or enable CURL on your system.

How to get access to raw resources that I put in res folder?

InputStream raw = context.getAssets().open("filename.ext");

Reader is = new BufferedReader(new InputStreamReader(raw, "UTF8"));

Converting EditText to int? (Android)

I'm very sleepy and tired right now but wouldn't this work?:

EditText et = (EditText)findViewById(R.id.editText1);
String sTextFromET = et.getText().toString();
int nIntFromET = new Integer(sTextFromET).intValue();

try
{
    int nIntFromET = Integer.parseInt(sTextFromET);
}
catch (NumberFormatException e)
{
    // handle the exception
}

Swift: declare an empty dictionary

var emptyDictionary = [String: String]()

var populatedDictionary = ["key1": "value1", "key2": "value2"]

Note: if you are going to change the contents of the dictionary over time then declare it as a var (variable). You can declare an empty dictionary as a let (constant) but it is pointless if you have the intention of changing its contents over time, since constant can't be changed after it has been initialized.

Old answer:

Creating an empty dictionary of type <String, String> would look as follows:

var emptyDictionary = Dictionary<String, String>()

Angular ng-class if else

Both John Conde's and ryeballar's answers are correct and will work.

If you want to get too geeky:

John's has the downside that it has to make two decisions per $digest loop (it has to decide whether to add/remove center and it has to decide whether to add/remove left), when clearly only one is needed.
Ryeballar's relies on the ternary operator which is probably going to be removed at some point (because the view should not contain any logic). (We can't be sure it will indeed be removed and it probably won't be any time soon, but if there is a more "safe" solution, why not ?)

So, you can do the following as an alternative:

ng-class="{true:'center',false:'left'}[page.isSelected(1)]"

Is it possible to add an HTML link in the body of a MAILTO link

It isn't possible as far as I can tell, since a link needs HTML, and mailto links don't create an HTML email.

This is probably for security as you could add javascript or iframes to this link and the email client might open up the end user for vulnerabilities.

How to correctly set Http Request Header in Angular 2

The simpler and current approach for adding header to a single request is:

// Step 1

const yourHeader: HttpHeaders = new HttpHeaders({
    Authorization: 'Bearer JWT-token'
});

// POST request

this.http.post(url, body, { headers: yourHeader });

// GET request

this.http.get(url, { headers: yourHeader });

laravel 5.5 The page has expired due to inactivity. Please refresh and try again

my problem solved by just adding @csrf in form tag

Laravel 5.6 doesn't support {{ csrf_field() }} just add @csrf in place of {{ csrf_field() }}

larvel_fix_error.png

How to create a static library with g++?

Create a .o file:

g++ -c header.cpp

add this file to a library, creating library if necessary:

ar rvs header.a header.o

use library:

g++ main.cpp header.a

Oracle client and networking components were not found

In my case this was because a file named ociw32.dll had been placed in c:\windows\system32. This is however only allowed to exist in c:\oracle\11.2.0.3\bin.

Deleting the file from system32, which had been placed there by an installation of Crystal Reports, fixed this issue

How to select records from last 24 hours using SQL?

Hello i now it past a lot of time from the original post but i got a similar problem and i want to share.

I got a datetime field with this format YYYY-MM-DD hh:mm:ss, and i want to access a whole day, so here is my solution.

The function DATE(), in MySQL: Extract the date part of a date or datetime expression.

SELECT * FROM `your_table` WHERE DATE(`your_datatime_field`)='2017-10-09'

with this i get all the row register in this day.

I hope its help anyone.

jQuery or JavaScript auto click

You are trying to make a popup work maybe? I don't know how to emulate click, maybe you can try to fire click event somehow, but I don't know if it is possible. More than likely such functionality is not implemented, because of security and privacy concerns.

You can use div with position:absolute to emulate popup at the same page. If you insist creating another page, I cannot help you. Maybe somebody else with more experience will add his 15 cents.

Trim spaces from start and end of string

If using jQuery is an option:

/**
 * Trim the site input[type=text] fields globally by removing any whitespace from the
 * beginning and end of a string on input .blur()
 */
$('input[type=text]').blur(function(){
    $(this).val($.trim($(this).val()));
});

or simply:

$.trim(string);

How to hide a View programmatically?

Try this:

linearLayout.setVisibility(View.GONE);

Regular expression for decimal number

In .NET, I recommend to dynamically build the regular expression with the decimal separator of the current cultural context:

using System.Globalization;

...

NumberFormatInfo nfi = NumberFormatInfo.CurrentInfo;
Regex re = new Regex("^(?\\d+(" 
                   + Regex.Escape(nfi.CurrencyDecimalSeparator) 
                   + "\\d{1,2}))$");

You might want to pimp the regexp by allowing 1000er separators the same way as the decimal separator.

Why does my sorting loop seem to append an element where it shouldn't?

If you use:

if (Array[i].compareToIgnoreCase(Array[j]) < 0)

you will get:

Example  Hello  is  Sorting  This

which I think is the output you were looking for.

Excel 2010 VBA Referencing Specific Cells in other worksheets

Sub Results2()

    Dim rCell As Range
    Dim shSource As Worksheet
    Dim shDest As Worksheet
    Dim lCnt As Long

    Set shSource = ThisWorkbook.Sheets("Sheet1")
    Set shDest = ThisWorkbook.Sheets("Sheet2")

    For Each rCell In shSource.Range("A1", shSource.Cells(shSource.Rows.Count, 1).End(xlUp)).Cells
        lCnt = lCnt + 1
        shDest.Range("A4").Offset(0, lCnt * 4).Formula = "=" & rCell.Address(False, False, , True) & "+" & rCell.Offset(0, 1).Address(False, False, , True)
    Next rCell

End Sub

This loops through column A of sheet1 and creates a formula in sheet2 for every cell. To find the last cell in Sheet1, I start at the bottom (shSource.Rows.Count) and .End(xlUp) to get the last cell in the column that's not blank.

To create the elements of the formula, I use the Address property of the cell on Sheet. I'm using three of the arguments to Address. The first two are RowAbsolute and ColumnAbsolute, both set to false. I don't care about the third argument, but I set the fourth argument (External) to True so that it includes the sheet name.

I prefer to go from Source to Destination rather than the other way. But that's just a personal preference. If you want to work from the destination,

Sub Results3()

    Dim i As Long, lCnt As Long
    Dim sh As Worksheet

    lCnt = Application.WorksheetFunction.CountA(ThisWorkbook.Sheets("Sheet1").Columns(1))
    Set sh = ThisWorkbook.Sheets("Sheet2")

    Const sSOURCE As String = "Sheet1!"

    For i = 1 To lCnt
        sh.Range("A1").Offset(0, 4 * (i - 1)).Formula = "=" & sSOURCE & "A" & i & " + " & sSOURCE & "B" & i
    Next i

End Sub

Load a bitmap image into Windows Forms using open file dialog

Works Fine. Try this,

private void addImageButton_Click(object sender, EventArgs e)
{
    OpenFileDialog of = new OpenFileDialog();
    //For any other formats
    of.Filter = "Image Files (*.bmp;*.jpg;*.jpeg,*.png)|*.BMP;*.JPG;*.JPEG;*.PNG"; 
    if (of.ShowDialog() == DialogResult.OK)
    {
        pictureBox1.ImageLocation = of.FileName;

    }
}

How can I declare a two dimensional string array?

A 3x3 (multidimensional) array can also be initialized (you have already declared it) like this:

string[,] Tablero =  {
                        { "a", "b", "c" },
                        { "d", "e", "f" }, 
                        { "g", "h", "i"} 
                     };

ValueError: math domain error

Your code is doing a log of a number that is less than or equal to zero. That's mathematically undefined, so Python's log function raises an exception. Here's an example:

>>> from math import log
>>> log(-1)
Traceback (most recent call last):
  File "<pyshell#59>", line 1, in <module>
    log(-1)
ValueError: math domain error

Without knowing what your newtonRaphson2 function does, I'm not sure I can guess where the invalid x[2] value is coming from, but hopefully this will lead you on the right track.

Permission denied error while writing to a file in Python

Please close the file if its still open on your computer, then try running the python code. I hope it works

DataTables: Cannot read property 'length' of undefined

Try as follows the return must be d, not d.data

 ajax: {
      "url": "xx/xxx/xxx",
      "type": "GET",
      "error": function (e) {
      },
      "dataSrc": function (d) {
         return d
      }
      },

How to resolve "git pull,fatal: unable to access 'https://github.com...\': Empty reply from server"

I solved, replacing 'http..' git url with 'ssh..' simple open .git/config file and copy it there

Assigning default value while creating migration file

You would have to first create your migration for the model basics then you create another migration to modify your previous using the change_column ...

def change
    change_column :widgets, :colour, :string, default: 'red'
end

builtins.TypeError: must be str, not bytes

The outfile should be in binary mode.

outFile = open('output.xml', 'wb')

Where is Java Installed on Mac OS X?

For :

OS X : 10.11.6
Java : 8

I confirm the answer of @Morrie .

   export JAVA_HOME=/Library/Internet\ Plug-Ins/JavaAppletPlugin.plugin/Contents/Home;

But if you are running containers your life will be easier

Resource from src/main/resources not found after building with maven

You can replace the src/main/resources/ directly by classpath:

So for your example you will replace this line:

new BufferedReader(new FileReader(new File("src/main/resources/config.txt")));

By this line:

new BufferedReader(new FileReader(new File("classpath:config.txt")));

How to calculate the IP range when the IP address and the netmask is given?

I know this is an older question, but I found this nifty library on nuget that seems to do just the trick for me:

http://nuget.org/packages/TakeIo.NetworkAddress/

pod install -bash: pod: command not found

You have to restart Terminal after installing the gem. Or you can simply open a new tab Terminal to fix.

How to import Swagger APIs into Postman?

You can do that: Postman -> Import -> Link -> {root_url}/v2/api-docs

Setting default checkbox value in Objective-C?

Documentation on UISwitch says:

[mySwitch setOn:NO];

In Interface Builder, select your switch and in the Attributes inspector you'll find State which can be set to on or off.

jQuery keypress() event not firing?

With jQuery, I've done it this way:

function checkKey(e){
     switch (e.keyCode) {
        case 40:
            alert('down');
            break;
        case 38:
            alert('up');
            break;
        case 37:
            alert('left');
            break;
        case 39:
            alert('right');
            break;
        default:
            alert('???');  
            }      
}

if ($.browser.mozilla) {
    $(document).keypress (checkKey);
} else {
    $(document).keydown (checkKey);
}

Also, try these plugins, which looks like they do all that work for you:

http://www.openjs.com/scripts/events/keyboard_shortcuts

http://www.webappers.com/2008/07/31/bind-a-hot-key-combination-with-jquery-hotkeys/

How to render a PDF file in Android

I have made a hybrid approach from some of the answers given to this and other similar posts:

This solution checks if a PDF reader app is installed and does the following: - If a reader is installed, download the PDF file to the device and start a PDF reader app - If no reader is installed, ask the user if he wants to view the PDF file online through Google Drive

NOTE! This solution uses the Android DownloadManager class, which was introduced in API9 (Android 2.3 or Gingerbread). This means that it doesn't work on Android 2.2 or earlier.

I wrote a blog post about it here, but I've provided the full code below for completeness:

public class PDFTools {
    private static final String GOOGLE_DRIVE_PDF_READER_PREFIX = "http://drive.google.com/viewer?url=";
    private static final String PDF_MIME_TYPE = "application/pdf";
    private static final String HTML_MIME_TYPE = "text/html";

    /**
     * If a PDF reader is installed, download the PDF file and open it in a reader. 
     * Otherwise ask the user if he/she wants to view it in the Google Drive online PDF reader.<br />
     * <br />
     * <b>BEWARE:</b> This method
     * @param context
     * @param pdfUrl
     * @return
     */
    public static void showPDFUrl( final Context context, final String pdfUrl ) {
        if ( isPDFSupported( context ) ) {
            downloadAndOpenPDF(context, pdfUrl);
        } else {
            askToOpenPDFThroughGoogleDrive( context, pdfUrl );
        }
    }

    /**
     * Downloads a PDF with the Android DownloadManager and opens it with an installed PDF reader app.
     * @param context
     * @param pdfUrl
     */
    @TargetApi(Build.VERSION_CODES.GINGERBREAD)
    public static void downloadAndOpenPDF(final Context context, final String pdfUrl) {
        // Get filename
        final String filename = pdfUrl.substring( pdfUrl.lastIndexOf( "/" ) + 1 );
        // The place where the downloaded PDF file will be put
        final File tempFile = new File( context.getExternalFilesDir( Environment.DIRECTORY_DOWNLOADS ), filename );
        if ( tempFile.exists() ) {
            // If we have downloaded the file before, just go ahead and show it.
            openPDF( context, Uri.fromFile( tempFile ) );
            return;
        }

        // Show progress dialog while downloading
        final ProgressDialog progress = ProgressDialog.show( context, context.getString( R.string.pdf_show_local_progress_title ), context.getString( R.string.pdf_show_local_progress_content ), true );

        // Create the download request
        DownloadManager.Request r = new DownloadManager.Request( Uri.parse( pdfUrl ) );
        r.setDestinationInExternalFilesDir( context, Environment.DIRECTORY_DOWNLOADS, filename );
        final DownloadManager dm = (DownloadManager) context.getSystemService( Context.DOWNLOAD_SERVICE );
        BroadcastReceiver onComplete = new BroadcastReceiver() {
            @Override
            public void onReceive(Context context, Intent intent) {
                if ( !progress.isShowing() ) {
                    return;
                }
                context.unregisterReceiver( this );

                progress.dismiss();
                long downloadId = intent.getLongExtra( DownloadManager.EXTRA_DOWNLOAD_ID, -1 );
                Cursor c = dm.query( new DownloadManager.Query().setFilterById( downloadId ) );

                if ( c.moveToFirst() ) {
                    int status = c.getInt( c.getColumnIndex( DownloadManager.COLUMN_STATUS ) );
                    if ( status == DownloadManager.STATUS_SUCCESSFUL ) {
                        openPDF( context, Uri.fromFile( tempFile ) );
                    }
                }
                c.close();
            }
        };
        context.registerReceiver( onComplete, new IntentFilter( DownloadManager.ACTION_DOWNLOAD_COMPLETE ) );

        // Enqueue the request
        dm.enqueue( r );
    }

    /**
     * Show a dialog asking the user if he wants to open the PDF through Google Drive
     * @param context
     * @param pdfUrl
     */
    public static void askToOpenPDFThroughGoogleDrive( final Context context, final String pdfUrl ) {
        new AlertDialog.Builder( context )
            .setTitle( R.string.pdf_show_online_dialog_title )
            .setMessage( R.string.pdf_show_online_dialog_question )
            .setNegativeButton( R.string.pdf_show_online_dialog_button_no, null )
            .setPositiveButton( R.string.pdf_show_online_dialog_button_yes, new OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    openPDFThroughGoogleDrive(context, pdfUrl); 
                }
            })
            .show();
    }

    /**
     * Launches a browser to view the PDF through Google Drive
     * @param context
     * @param pdfUrl
     */
    public static void openPDFThroughGoogleDrive(final Context context, final String pdfUrl) {
        Intent i = new Intent( Intent.ACTION_VIEW );
        i.setDataAndType(Uri.parse(GOOGLE_DRIVE_PDF_READER_PREFIX + pdfUrl ), HTML_MIME_TYPE );
        context.startActivity( i );
    }
    /**
     * Open a local PDF file with an installed reader
     * @param context
     * @param localUri
     */
    public static final void openPDF(Context context, Uri localUri ) {
        Intent i = new Intent( Intent.ACTION_VIEW );
        i.setDataAndType( localUri, PDF_MIME_TYPE );
        context.startActivity( i );
    }
    /**
     * Checks if any apps are installed that supports reading of PDF files.
     * @param context
     * @return
     */
    public static boolean isPDFSupported( Context context ) {
        Intent i = new Intent( Intent.ACTION_VIEW );
        final File tempFile = new File( context.getExternalFilesDir( Environment.DIRECTORY_DOWNLOADS ), "test.pdf" );
        i.setDataAndType( Uri.fromFile( tempFile ), PDF_MIME_TYPE );
        return context.getPackageManager().queryIntentActivities( i, PackageManager.MATCH_DEFAULT_ONLY ).size() > 0;
    }

}

How to drop all tables from the database with manage.py CLI in Django?

python manage.py migrate <app> zero

sqlclear was removed from 1.9.

Release notes mention that it is due to the introduction of migrations: https://docs.djangoproject.com/en/1.9/releases/1.9/

Unfortunately I could not find a method that works on all apps at once, nor a built-in way to list all installed apps from the admin: How to list all installed apps with manage.py in Django?

How to find keys of a hash?

using jQuery you can get the keys like this:

var bobject =  {primary:"red",bg:"maroon",hilite:"green"};
var keys = [];
$.each(bobject, function(key,val){ keys.push(key); });
console.log(keys); // ["primary", "bg", "hilite"]

Or:

var bobject =  {primary:"red",bg:"maroon",hilite:"green"};
$.map(bobject, function(v,k){return k;});

thanks to @pimlottc

Does JavaScript pass by reference?

Primitives are passed by value. But in case you only need to read the value of a primitve (and value is not known at the time when function is called) you can pass function which retrieves the value at the moment you need it.

function test(value) {
  console.log('retrieve value');
  console.log(value());
}

// call the function like this
var value = 1;
test(() => value);

how to get date of yesterday using php?

you can do this by

date("F j, Y", time() - 60 * 60 * 24);

or by

date("F j, Y", strtotime("yesterday"));

Twig ternary operator, Shorthand if-then-else

{{ (ability.id in company_abilities) ? 'selected' : '' }}

The ternary operator is documented under 'other operators'

GitHub authentication failing over https, returning wrong email address

On Windows, you may be silently blocked by your Antivirus or Windows firewall. Temporarily turn off those services and push/pull from remote origin.

Guid.NewGuid() vs. new Guid()

Guid.NewGuid() creates a new UUID using an algorithm that is designed to make collisions very, very unlikely.

new Guid() creates a UUID that is all-zeros.

Generally you would prefer the former, because that's the point of a UUID (unless you're receiving it from somewhere else of course).

There are cases where you do indeed want an all-zero UUID, but in this case Guid.Empty or default(Guid) is clearer about your intent, and there's less chance of someone reading it expecting a unique value had been created.

In all, new Guid() isn't that useful due to this lack of clarity, but it's not possible to have a value-type that doesn't have a parameterless constructor that returns an all-zeros-and-nulls value.

Edit: Actually, it is possible to have a parameterless constructor on a value type that doesn't set everything to zero and null, but you can't do it in C#, and the rules about when it will be called and when there will just be an all-zero struct created are confusing, so it's not a good idea anyway.

Should I return EXIT_SUCCESS or 0 from main()?

Once you start writing code that can return a myriad of exit statuses, you start #define'ing all of them. In this case EXIT_SUCCESS makes sense in context of not being a "magic number". This makes your code more readable because every other exit code will be EXIT_SOMETHING. If you simply write a program that will return when it's done, return 0 is valid, and probably even cleaner because it suggests that there's no sophisticated return code structure.

Remove large .pack file created by git

this is more of a handy solution than a coding one. zip the file. Open the zip in file view format (different from unzipping). Delete the .pack file. Unzip and replace the folder. Works like a charm!

How to make modal dialog in WPF?

A lot of these answers are simplistic, and if someone is beginning WPF, they may not know all of the "ins-and-outs", as it is more complicated than just telling someone "Use .ShowDialog()!". But that is the method (not .Show()) that you want to use in order to block use of the underlying window and to keep the code from continuing until the modal window is closed.

First, you need 2 WPF windows. (One will be calling the other.)

From the first window, let's say that was called MainWindow.xaml, in its code-behind will be:

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
    }
}

Then add your button to your XAML:

<Button Name="btnOpenModal" Click="btnOpenModal_Click" Content="Open Modal" />

And right-click the Click routine, select "Go to definition". It will create it for you in MainWindow.xaml.cs:

private void btnOpenModal_Click(object sender, RoutedEventArgs e)
{
}

Within that function, you have to specify the other page using its page class. Say you named that other page "ModalWindow", so that becomes its page class and is how you would instantiate (call) it:

private void btnOpenModal_Click(object sender, RoutedEventArgs e)
{
    ModalWindow modalWindow = new ModalWindow();
    modalWindow.ShowDialog();
}

Say you have a value you need set on your modal dialog. Create a textbox and a button in the ModalWindow XAML:

<StackPanel Orientation="Horizontal">
    <TextBox Name="txtSomeBox" />
    <Button Name="btnSaveData" Click="btnSaveData_Click" Content="Save" /> 
</StackPanel>

Then create an event handler (another Click event) again and use it to save the textbox value to a public static variable on ModalWindow and call this.Close().

public partial class ModalWindow : Window
{
    public static string myValue = String.Empty;        
    public ModalWindow()
    {
        InitializeComponent();
    }

    private void btnSaveData_Click(object sender, RoutedEventArgs e)
    {
        myValue = txtSomeBox.Text;
        this.Close();
    }
}

Then, after your .ShowDialog() statement, you can grab that value and use it:

private void btnOpenModal_Click(object sender, RoutedEventArgs e)
{
    ModalWindow modalWindow = new ModalWindow();
    modalWindow.ShowDialog();

    string valueFromModalTextBox = ModalWindow.myValue;
}

How to set order of repositories in Maven settings.xml

As far as I know, the order of the repositories in your pom.xml will also decide the order of the repository access.

As for configuring repositories in settings.xml, I've read that the order of repositories is interestingly enough the inverse order of how the repositories will be accessed.

Here a post where someone explains this curiosity:
http://community.jboss.org/message/576851

Get class name using jQuery

you can simply use,

var className = $('#id').attr('class');

Is it possible to have SSL certificate for IP address, not domain name?

The C/A Browser forum sets what is and is not valid in a certificate, and what CA's should reject.

According to their Baseline Requirements for the Issuance and Management of Publicly-Trusted Certificates document, CAs must, since 2015, not issue certificats where the common name, or common alternate names fields contains a reserved IP or internal name, where reserved IP addresses are IPs that IANA has listed as reserved - which includes all NAT IPs - and internal names are any names that don't resolve on the public DNS.

Public IP addresses CAN be used (and the baseline requirements doc specifies what kinds of checks a CA must perform to ensure the applicant owns the IP).

PHP: How to remove all non printable characters in a string?

For anyone that is still looking how to do this without removing the non-printable characters, but rather escaping them, I made this to help out. Feel free to improve it! Characters are escaped to \\x[A-F0-9][A-F0-9].

Call like so:

$escaped = EscapeNonASCII($string);

$unescaped = UnescapeNonASCII($string);

<?php 
  function EscapeNonASCII($string) //Convert string to hex, replace non-printable chars with escaped hex
    {
        $hexbytes = strtoupper(bin2hex($string));
        $i = 0;
        while ($i < strlen($hexbytes))
        {
            $hexpair = substr($hexbytes, $i, 2);
            $decimal = hexdec($hexpair);
            if ($decimal < 32 || $decimal > 126)
            {
                $top = substr($hexbytes, 0, $i);
                $escaped = EscapeHex($hexpair);
                $bottom = substr($hexbytes, $i + 2);
                $hexbytes = $top . $escaped . $bottom;
                $i += 8;
            }
            $i += 2;
        }
        $string = hex2bin($hexbytes);
        return $string;
    }
    function EscapeHex($string) //Helper function for EscapeNonASCII()
    {
        $x = "5C5C78"; //\x
        $topnibble = bin2hex($string[0]); //Convert top nibble to hex
        $bottomnibble = bin2hex($string[1]); //Convert bottom nibble to hex
        $escaped = $x . $topnibble . $bottomnibble; //Concatenate escape sequence "\x" with top and bottom nibble
        return $escaped;
    }

    function UnescapeNonASCII($string) //Convert string to hex, replace escaped hex with actual hex.
    {
        $stringtohex = bin2hex($string);
        $stringtohex = preg_replace_callback('/5c5c78([a-fA-F0-9]{4})/', function ($m) { 
            return hex2bin($m[1]);
        }, $stringtohex);
        return hex2bin(strtoupper($stringtohex));
    }
?>

C++ callback using class member

What you want to do is to make an interface which handles this code and all your classes implement the interface.

class IEventListener{
public:
   void OnEvent(int x) = 0;  // renamed Callback to OnEvent removed the instance, you can add it back if you want.
};


class MyClass :public IEventListener
{
    ...
    void OnEvent(int x); //typically such a function is NOT static. This wont work if it is static.
};

class YourClass :public IEventListener
{

Note that for this to work the "Callback" function is non static which i believe is an improvement. If you want it to be static, you need to do it as JaredC suggests with templates.

Load More Posts Ajax Button in WordPress

If I'm not using any category then how can I use this code? Actually, I want to use this code for custom post type.

Check Whether a User Exists

There's no need to check the exit code explicitly. Try

if getent passwd $1 > /dev/null 2>&1; then
    echo "yes the user exists"
else
    echo "No, the user does not exist"
fi

If that doesn't work, there is something wrong with your getent, or you have more users defined than you think.

How to save an HTML5 Canvas as an image on a server?

I've worked on something similar. Had to convert canvas Base64-encoded image to Uint8Array Blob.

function b64ToUint8Array(b64Image) {
   var img = atob(b64Image.split(',')[1]);
   var img_buffer = [];
   var i = 0;
   while (i < img.length) {
      img_buffer.push(img.charCodeAt(i));
      i++;
   }
   return new Uint8Array(img_buffer);
}

var b64Image = canvas.toDataURL('image/jpeg');
var u8Image  = b64ToUint8Array(b64Image);

var formData = new FormData();
formData.append("image", new Blob([ u8Image ], {type: "image/jpg"}));

var xhr = new XMLHttpRequest();
xhr.open("POST", "/api/upload", true);
xhr.send(formData);

What is a Maven artifact?

Maven organizes its build in projects.

An artifact in maven is a resource generated by a maven project. Each maven project can have exactly one artifact like a jar, war, ear, etc.
The project's configuration file "pom.xml" describes how the artifact is build, how unit tests are run, etc. Commonly a software project build with maven consists of many maven-projects that build artifacts (e.g. jars) that constitute the product.
E.g.

Root-Project   // produces no artifact, simply triggers the build of the other projects
  App-Project  // The application, that uses the libraries
  Lib1-Project // A project that creates a library (jar)
  Lib2-Project // Another library
  Doc-Project  // A project that generates the user documentation from some resources

Maven artifacts are not limited to java resources. You can generate whatever resource you need. E.g. documentation, project-site, zip-archives, native-libraries, etc.

Each maven project has a unique identifier consiting of [groupId, artifactId, version]. When a maven project requires resources of another project a dependency is configured in it's pom.xml using the above-mentioned identifier. Maven then automatically resolves the dependencies when a build is triggered. The artifacts of the required projects are then loaded either from the local repository, which is a simple directory in your user's home, or from other (remote) repositories specified in you pom.xml.

Pandas dataframe groupby plot

Similar to Julien's answer above, I had success with the following:

fig, ax = plt.subplots(figsize=(10,4))
for key, grp in df.groupby(['ticker']):
    ax.plot(grp['Date'], grp['adj_close'], label=key)

ax.legend()
plt.show()

This solution might be more relevant if you want more control in matlab.

Solution inspired by: https://stackoverflow.com/a/52526454/10521959

How do you create a hidden div that doesn't create a line break or horizontal space?

Since the release of HTML5 one can now simply do:

<div hidden>This div is hidden</div>

Note: This is not supported by some old browsers, most notably IE < 11.

Hidden Attribute Documentation (MDN,W3C)

difference between System.out.println() and System.err.println()

It's worth noting that an OS has one queue for both System.err and System.out. Consider the following code:

public class PrintQueue {
    public static void main(String[] args) {
        for(int i = 0; i < 100; i++) {
            System.out.println("out");
            System.err.println("err");
        }
    }
}

If you compile and run the program, you will see that the order of outputs in console is mixed up.

An OS will remain right order if you work either with System.out or System.err only. But it can randomly choose what to print next to console, if you use both of these.

Even in this code snippet you can see that the order is mixed up sometimes:

public class PrintQueue {
    public static void main(String[] args) {
        System.out.println("out");
        System.err.println("err");
    }
}

What type of hash does WordPress use?

I had same problem finding out what kind of Hash does Wordpress Uses .

It is wp hash password.

Example

Compare an already hashed password with its plain-text string:

<?php
$wp_hasher = new PasswordHash(8, TRUE);

$password_hashed = '$P$B55D6LjfHDkINU5wF.v2BuuzO0/XPk/';
$plain_password = 'test';

if($wp_hasher->CheckPassword($plain_password, $password_hashed)) {
    echo "YES, Matched";
} else {
    echo "No, Wrong Password";
}
?>

See These Links: https://codex.wordpress.org/Function_Reference/wp_hash_password

https://developer.wordpress.org/reference/functions/wp_hash_password

It uses PasswordHash, which adds salt to the password and hashes it with 8 passes of MD5.

Where to put the gradle.properties file

Gradle looks for gradle.properties files in these places:

in project build dir (that is where your build script is)
in sub-project dir
in gradle user home (defined by the GRADLE_USER_HOME environment variable, which if not set defaults to USER_HOME/.gradle)

Properties from one file will override the properties from the previous ones (so file in gradle user home has precedence over the others, and file in sub-project has precedence over the one in project root).

Reference: https://gradle.org/docs/current/userguide/build_environment.html

What is the recommended way to delete a large number of items from DynamoDB?

If you want to delete items after some time, e.g. after a month, just use Time To Live option. It will not count write units.

In your case, I would add ttl when logs expire and leave those after a user is deleted. TTL would make sure logs are removed eventually.

When Time To Live is enabled on a table, a background job checks the TTL attribute of items to see if they are expired.

DynamoDB typically deletes expired items within 48 hours of expiration. The exact duration within which an item truly gets deleted after expiration is specific to the nature of the workload and the size of the table. Items that have expired and not been deleted will still show up in reads, queries, and scans. These items can still be updated and successful updates to change or remove the expiration attribute will be honored.

https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/TTL.html https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/howitworks-ttl.html

"The specified Android SDK Build Tools version (26.0.0) is ignored..."

Solution to this problem is simple

Go to build.gradle (module.app) file

It will help us to rebuild gradle for the project, to make it sync again.

Best method for reading newline delimited files and discarding the newlines?

I'd do it like this:

f = open('test.txt')
l = [l for l in f.readlines() if l.strip()]
f.close()
print l

CASE (Contains) rather than equal statement

CASE WHEN ', ' + dbo.Table.Column +',' LIKE '%, lactulose,%' 
  THEN 'BP Medication' ELSE '' END AS [BP Medication]

The leading ', ' and trailing ',' are added so that you can handle the match regardless of where it is in the string (first entry, last entry, or anywhere in between).

That said, why are you storing data you want to search on as a comma-separated string? This violates all kinds of forms and best practices. You should consider normalizing your schema.

In addition: don't use 'single quotes' as identifier delimiters; this syntax is deprecated. Use [square brackets] (preferred) or "double quotes" if you must. See "string literals as column aliases" here: http://msdn.microsoft.com/en-us/library/bb510662%28SQL.100%29.aspx

EDIT If you have multiple values, you can do this (you can't short-hand this with the other CASE syntax variant or by using something like IN()):

CASE 
  WHEN ', ' + dbo.Table.Column +',' LIKE '%, lactulose,%' 
  WHEN ', ' + dbo.Table.Column +',' LIKE '%, amlodipine,%' 
  THEN 'BP Medication' ELSE '' END AS [BP Medication]

If you have more values, it might be worthwhile to use a split function, e.g.

USE tempdb;
GO

CREATE FUNCTION dbo.SplitStrings(@List NVARCHAR(MAX))
RETURNS TABLE
AS
   RETURN ( SELECT DISTINCT Item FROM
       ( SELECT Item = x.i.value('(./text())[1]', 'nvarchar(max)')
         FROM ( SELECT [XML] = CONVERT(XML, '<i>'
         + REPLACE(@List,',', '</i><i>') + '</i>').query('.')
           ) AS a CROSS APPLY [XML].nodes('i') AS x(i) ) AS y
       WHERE Item IS NOT NULL
   );
GO

CREATE TABLE dbo.[Table](ID INT, [Column] VARCHAR(255));
GO

INSERT dbo.[Table] VALUES
(1,'lactulose, Lasix (furosemide), oxazepam, propranolol, rabeprazole, sertraline,'),
(2,'lactulite, Lasix (furosemide), lactulose, propranolol, rabeprazole, sertraline,'),
(3,'lactulite, Lasix (furosemide), oxazepam, propranolol, rabeprazole, sertraline,'),
(4,'lactulite, Lasix (furosemide), lactulose, amlodipine, rabeprazole, sertraline,');

SELECT t.ID
  FROM dbo.[Table] AS t
  INNER JOIN dbo.SplitStrings('lactulose,amlodipine') AS s
  ON ', ' + t.[Column] + ',' LIKE '%, ' + s.Item + ',%'
  GROUP BY t.ID;
GO

Results:

ID
----
1
2
4

How to convert a multipart file to File?

The answer by Alex78191 has worked for me.

public File getTempFile(MultipartFile multipartFile)
{

CommonsMultipartFile commonsMultipartFile = (CommonsMultipartFile) multipartFile;
FileItem fileItem = commonsMultipartFile.getFileItem();
DiskFileItem diskFileItem = (DiskFileItem) fileItem;
String absPath = diskFileItem.getStoreLocation().getAbsolutePath();
File file = new File(absPath);

//trick to implicitly save on disk small files (<10240 bytes by default)

if (!file.exists()) {
    file.createNewFile();
    multipartFile.transferTo(file);
}

return file;
}

For uploading files having size greater than 10240 bytes please change the maxInMemorySize in multipartResolver to 1MB.

<bean id="multipartResolver"
    class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<!-- setting maximum upload size t 20MB -->
<property name="maxUploadSize" value="20971520" />
<!-- max size of file in memory (in bytes) -->
<property name="maxInMemorySize" value="1048576" />
<!-- 1MB --> </bean>

Loop through each row of a range in Excel

Just stumbled upon this and thought I would suggest my solution. I typically like to use the built in functionality of assigning a range to an multi-dim array (I guess it's also the JS Programmer in me).

I frequently write code like this:

Sub arrayBuilder()

myarray = Range("A1:D4")

'unlike most VBA Arrays, this array doesn't need to be declared and will be automatically dimensioned

For i = 1 To UBound(myarray)

    For j = 1 To UBound(myarray, 2)

    Debug.Print (myarray(i, j))

    Next j

Next i

End Sub

Assigning ranges to variables is a very powerful way to manipulate data in VBA.

How can I reference a commit in an issue comment on GitHub?

If you are trying to reference a commit in another repo than the issue is in, you can prefix the commit short hash with reponame@.

Suppose your commit is in the repo named dev, and the GitLab issue is in the repo named test. You can leave a comment on the issue and reference the commit by dev@e9c11f0a (where e9c11f0a is the first 8 letters of the sha hash of the commit you want to link to) if that makes sense.

Export and Import all MySQL databases at one time

Based on these answers I've made script which backups all databases into separate files, but then compress them into one archive with date as name.

This will not ask for password, can be used in cron. To store password in .my.cnf check this answer https://serverfault.com/a/143587/62749

Made also with comments for those who are not very familiar with bash scripts.

#!/bin/bash

# This script will backup all mysql databases into 
# compressed file named after date, ie: /var/backup/mysql/2016-07-13.tar.bz2

# Setup variables used later

# Create date suffix with "F"ull date format
suffix=$(date +%F)
# Retrieve all database names except information schemas. Use sudo here to skip root password.
dbs=$(sudo mysql --defaults-extra-file=/root/.my.cnf --batch --skip-column-names -e "SHOW DATABASES;" | grep -E -v "(information|performance)_schema")
# Create temporary directory with "-d" option
tmp=$(mktemp -d)
# Set output dir here. /var/backups/ is used by system, 
# so intentionally used /var/backup/ for user backups.
outDir="/var/backup/mysql"
# Create output file name
out="$outDir/$suffix.tar.bz2"

# Actual script

# Check if output directory exists
if [ ! -d "$outDir" ];then
  # Create directory with parent ("-p" option) directories
  sudo mkdir -p "$outDir"
fi

# Loop through all databases
for db in $dbs; do
  # Dump database to temporary directory with file name same as database name + sql suffix
  sudo mysqldump --defaults-extra-file=/root/.my.cnf --databases "$db" > "$tmp/$db.sql"
done

# Go to tmp dir
cd $tmp

# Compress all dumps with bz2, discard any output to /dev/null
sudo tar -jcf "$out" * > "/dev/null"

# Cleanup
cd "/tmp/"
sudo rm -rf "$tmp"

Animate text change in UILabel

This is a C# UIView extension method that's based on @SwiftArchitect's code. When auto layout is involved and controls need to move depending on the label's text, this calling code uses the Superview of the label as the transition view instead of the label itself. I added a lambda expression for the action to make it more encapsulated.

public static void FadeTransition( this UIView AView, double ADuration, Action AAction )
{
  CATransition transition = new CATransition();

  transition.Duration = ADuration;
  transition.TimingFunction = CAMediaTimingFunction.FromName( CAMediaTimingFunction.Linear );
  transition.Type = CATransition.TransitionFade;

  AView.Layer.AddAnimation( transition, transition.Type );
  AAction();
}

Calling code:

  labelSuperview.FadeTransition( 0.5d, () =>
  {
    if ( condition )
      label.Text = "Value 1";
    else
      label.Text = "Value 2";
  } );

Generating random strings with T-SQL

Heres something based on New Id.

with list as 
(
    select 1 as id,newid() as val
         union all
    select id + 1,NEWID()
    from    list   
    where   id + 1 < 10
) 
select ID,val from list
option (maxrecursion 0)

Best way to overlay an ESRI shapefile on google maps?

I like using (open source and gui friendly) Quantum GIS to convert the shapefile to kml.

Google Maps API supports only a subset of the KML standard. One limitation is file size.

To reduce your file size, you can Quantum GIS's "simplify geometries" function. This "smooths" polygons.

Then you can select your layer and do a "save as kml" on it.

If you need to process a bunch of files, the process can be batched with Quantum GIS's ogr2ogr command from osgeo4w shell.

Finally, I recommend zipping your kml (with your favorite compression program) for reduced file size and saving it as kmz.

Find duplicate records in a table using SQL Server

SQL> SELECT JOB,COUNT(JOB) FROM EMP GROUP BY JOB;

JOB       COUNT(JOB)
--------- ----------
ANALYST            2
CLERK              4
MANAGER            3
PRESIDENT          1
SALESMAN           4

Git Cherry-pick vs Merge Workflow

Rebase and Cherry-pick is the only way you can keep clean commit history. Avoid using merge and avoid creating merge conflict. If you are using gerrit set one project to Merge if necessary and one project to cherry-pick mode and try yourself.

How to get the current plugin directory in WordPress?

This will actually get the result you want:

<?php plugin_dir_url(__FILE__); ?>

http://codex.wordpress.org/Function_Reference/plugin_dir_url

How do you use Intent.FLAG_ACTIVITY_CLEAR_TOP to clear the Activity Stack?

I have started Activity A->B->C->D. When the back button is pressed on Activity D I want to go to Activity A. Since A is my starting point and therefore already on the stack all the activities in top of A is cleared and you can't go back to any other Activity from A.

This actually works in my code:

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_BACK) {
        Intent a = new Intent(this,A.class);
        a.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        startActivity(a);
        return true;
    }
    return super.onKeyDown(keyCode, event);
}

How to show an empty view with a RecyclerView?

I added RecyclerView and alternative ImageView to the RelativeLayout:

<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ImageView
        android:id="@+id/no_active_jobs"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:src="@mipmap/ic_active_jobs" />

    <android.support.v7.widget.RecyclerView xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/recyclerView"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</RelativeLayout>

and then in Adapter:

@Override
public int getItemCount() {
    if (mOrders.size() == 0) {
        mRecyclerView.setVisibility(View.INVISIBLE);
    } else {
        mRecyclerView.setVisibility(View.VISIBLE);
    }
    return mOrders.size();
}

Match the path of a URL, minus the filename extension

Simple:

$url = "http://php.net/manual/en/function.preg-match.php";
preg_match("/http:\/\/php\.net(.+)\.php/", $url, $matches);
echo $matches[1];

$matches[0] is your full URL, $matches[1] is the part you want.

See yourself: http://codepad.viper-7.com/hHmwI2

How do you see the entire command history in interactive Python?

If you want to write the history to a file:

import readline
readline.write_history_file('python_history.txt')

The help function gives:

Help on built-in function write_history_file in module readline:

write_history_file(...)
    write_history_file([filename]) -> None
    Save a readline history file.
    The default filename is ~/.history.

How to change date format (MM/DD/YY) to (YYYY-MM-DD) in date picker

I used this approach to perform the same operation in my app.

var varDate = $("#dateStart").val(); 

var DateinISO = $.datepicker.parseDate('mm/dd/yy', varDate); 

var DateNewFormat = $.datepicker.formatDate( "yy-mm-dd", new Date( DateinISO ) );

$("#dateStartNewFormat").val(DateNewFormat);

Python webbrowser.open() to open Chrome browser

worked for me to open new tab on google-chrome:

import webbrowser

webbrowser.open_new_tab("http://www.google.com")

Loop through properties in JavaScript object with Lodash

For your stated desire to "check if a property exists" you can directly use Lo-Dash's has.

var exists = _.has(myObject, propertyNameToCheck);

How to get all selected values of a multiple select box?

Riot js code

this.GetOpt=()=>{

let opt=this.refs.ni;

this.logger.debug("Options length "+opt.options.length);

for(let i=0;i<=opt.options.length;i++)
{
  if(opt.options[i].selected==true)
    this.logger.debug(opt.options[i].value);
}
};

//**ni** is a name of HTML select option element as follows
//**HTML code**
<select multiple ref="ni">
  <option value="">---Select---</option>
  <option value="Option1 ">Gaming</option>
  <option value="Option2">Photoshoot</option>
</select>

Which command do I use to generate the build of a Vue app?

I think you can use vue-cli

If you are using Vue CLI along with a backend framework that handles static assets as part of its deployment, all you need to do is making sure Vue CLI generates the built files in the correct location, and then follow the deployment instruction of your backend framework.

If you are developing your frontend app separately from your backend - i.e. your backend exposes an API for your frontend to talk to, then your frontend is essentially a purely static app. You can deploy the built content in the dist directory to any static file server, but make sure to set the correct baseUrl

how to set background image in submit button?

The way I usually do it, is with the following css:

div#submitForm input {
  background: url("../images/buttonbg.png") no-repeat scroll 0 0 transparent;
  color: #000000;
  cursor: pointer;
  font-weight: bold;
  height: 20px;
  padding-bottom: 2px;
  width: 75px;
}

and the markup:

<div id="submitForm">
    <input type="submit" value="Submit" name="submit">
</div>

If things look different in the various browsers I implore you to use a reset style sheet which sets all margins, padding and maybe even borders to zero.

Cocoa Touch: How To Change UIView's Border Color And Thickness?

If you didn't want to edit the layer of a UIView, you could always embed the view within another view. The parent view would have its background color set to the border color. It would also be slightly larger, depending upon how wide you want the border to be.

Of course, this only works if your view isn't transparent and you only want a single border color. The OP wanted the border in the view itself, but this may be a viable alternative.

Difference between ${} and $() in Bash

your understanding is right. For detailed info on {} see bash ref - parameter expansion
'for' and 'while' have different syntax and offer different styles of programmer control for an iteration. Most non-asm languages offer a similar syntax.

With while, you would probably write i=0; while [ $i -lt 10 ]; do echo $i; i=$(( i + 1 )); done in essence manage everything about the iteration yourself

What is the first character in the sort order used by Windows Explorer?

I had the same problem. I wanted to 'bury' a folder at the bottom of the sort instead of bringing it to the top with the '!' character. Windows recognizes most special characters as just that, 'special', and therefore they ALL are sorted at the top.

However, if you think outside of the English characters, you will find a lot of luck. I used Character Map and the arial font, scrolled down past '~' and the others to the greek alphabet. Capitol Xi, ?, worked best for me, but I didn't check to see which was the actual 'lowest' in the sort.

JAXB :Need Namespace Prefix to all the elements

Solved by adding

@XmlSchema(
    namespace = "http://www.example.com/a",
    elementFormDefault = XmlNsForm.QUALIFIED,
    xmlns = {
        @XmlNs(prefix="ns1", namespaceURI="http://www.example.com/a")
    }
)  

package authenticator.beans.login;
import javax.xml.bind.annotation.*;

in package-info.java

Took help of jaxb-namespaces-missing : Answer provided by Blaise Doughan

Does Ruby have a string.startswith("abc") built in method?

It's called String#start_with?, not String#startswith: In Ruby, the names of boolean-ish methods end with ? and the words in method names are separated with an _. Not sure where the s went, personally, I'd prefer String#starts_with? over the actual String#start_with?

docker build with --build-arg with multiple arguments

Use --build-arg with each argument.

If you are passing two argument then add --build-arg with each argument like:

docker build \
-t essearch/ess-elasticsearch:1.7.6 \
--build-arg number_of_shards=5 \
--build-arg number_of_replicas=2 \
--no-cache .

How to create full path with node's fs.mkdirSync?

Too many answers, but here's a solution without recursion that works by splitting the path and then left-to-right building it back up again

function mkdirRecursiveSync(path) {
    let paths = path.split(path.delimiter);
    let fullPath = '';
    paths.forEach((path) => {

        if (fullPath === '') {
            fullPath = path;
        } else {
            fullPath = fullPath + '/' + path;
        }

        if (!fs.existsSync(fullPath)) {
            fs.mkdirSync(fullPath);
        }
    });
};

For those concerned about windows vs Linux compatibility, simply replace the forward slash with double backslash '\' in both occurrence above but TBH we are talking about node fs not windows command line and the former is pretty forgiving and the above code will simply work on Windows and is more a complete solution cross platform.

alternative to "!is.null()" in R

To handle undefined variables as well as nulls, you can use substitute with deparse:

nullSafe <- function(x) {
  if (!exists(deparse(substitute(x))) || is.null(x)) {
    return(NA)
  } else {
    return(x)
  }
}

nullSafe(my.nonexistent.var)

How do I paste multi-line bash codes into terminal and run it all at once?

In addition to backslash, if a line ends with | or && or ||, it will be continued on the next line.

Generic type conversion FROM string

lubos hasko's method fails for nullables. The method below will work for nullables. I didn't come up with it, though. I found it via Google: http://web.archive.org/web/20101214042641/http://dogaoztuzun.com/post/C-Generic-Type-Conversion.aspx Credit to "Tuna Toksoz"

Usage first:

TConverter.ChangeType<T>(StringValue);

The class is below.

public static class TConverter
{
    public static T ChangeType<T>(object value)
    {
        return (T)ChangeType(typeof(T), value);
    }

    public static object ChangeType(Type t, object value)
    {
        TypeConverter tc = TypeDescriptor.GetConverter(t);
        return tc.ConvertFrom(value);
    }

    public static void RegisterTypeConverter<T, TC>() where TC : TypeConverter
    {

        TypeDescriptor.AddAttributes(typeof(T), new TypeConverterAttribute(typeof(TC)));
    }
}

How do I strip all spaces out of a string in PHP?

str_replace will do the trick thusly

$new_str = str_replace(' ', '', $old_str);

How do I create a shortcut via command-line in Windows?

I would like to propose different solution which wasn't mentioned here which is using .URL files:

set SHRT_LOCA=%userprofile%\Desktop\new_shortcut2.url
set SHRT_DEST=C:\Windows\write.exe
echo [InternetShortcut]> %SHRT_LOCA%
echo URL=file:///%SHRT_DEST%>> %SHRT_LOCA%
echo IconFile=%SHRT_DEST%>> %SHRT_LOCA%
echo IconIndex=^0>> %SHRT_LOCA%

Notes:

By default .url files are intended to open web pages but they are working fine for any properly constructed URI
Microsoft Windows does not display the .url file extension even if "Hide extensions for known file types" option in Windows Explorer is disabled
IconFile and IconIndex are optional
For reference you can check An Unofficial Guide to the URL File Format of Edward Blake

How do I clone a generic list in C#?

If you only care about value types...

And you know the type:

List<int> newList = new List<int>(oldList);

If you don't know the type before, you'll need a helper function:

List<T> Clone<T>(IEnumerable<T> oldList)
{
    return newList = new List<T>(oldList);
}

The just:

List<string> myNewList = Clone(myOldList);

Manually type in a value in a "Select" / Drop-down HTML list?

I faced the same basic problem: trying to combine the functionality of a textbox and a select box which are fundamentally different things in the html spec.

The good news is that selectize.js does exactly this:

Selectize is the hybrid of a textbox and box. It's jQuery-based and it's useful for tagging, contact lists, country selectors, and so on.

how to sort order of LEFT JOIN in SQL query?

Try using MAX with a GROUP BY.

SELECT u.userName, MAX(c.carPrice)
FROM users u
    LEFT JOIN cars c ON u.id = c.belongsToUser
WHERE u.id = 4;
GROUP BY u.userName;

Further information on `GROUP BY`

The group by clause is used to split the selected records into groups based on unique combinations of the group by columns. This then allows us to use aggregate functions (eg. MAX, MIN, SUM, AVG, ...) that will be applied to each group of records in turn. The database will return a single result record for each grouping.

For example, if we have a set of records representing temperatures over time and location in a table like this:

Location   Time    Temperature
--------   ----    -----------
London     12:00          10.0
Bristol    12:00          12.0
Glasgow    12:00           5.0
London     13:00          14.0
Bristol    13:00          13.0
Glasgow    13:00           7.0
...

Then if we want to find the maximum temperature by location, then we need to split the temperature records into groupings, where each record in a particular group has the same location. We then want to find the maximum temperature of each group. The query to do this would be as follows:

SELECT Location, MAX(Temperature)
FROM Temperatures
GROUP BY Location;

DataTrigger where value is NOT null?

I'm using this to only enable a button if a listview item is selected (ie not null):

<Style TargetType="{x:Type Button}">
    <Setter Property="IsEnabled" Value="True"/>
    <Style.Triggers>
        <DataTrigger Binding="{Binding ElementName=lvMyList, Path=SelectedItem}" Value="{x:Null}">
            <Setter Property="IsEnabled" Value="False"/>
        </DataTrigger>
    </Style.Triggers>
</Style>

Html/PHP - Form - Input as array

If is ok for you to index the array you can do this:

<form>
    <input type="text" class="form-control" placeholder="Titel" name="levels[0][level]">
    <input type="text" class="form-control" placeholder="Titel" name="levels[0][build_time]">

    <input type="text" class="form-control" placeholder="Titel" name="levels[1][level]">
    <input type="text" class="form-control" placeholder="Titel" name="levels[1][build_time]">

    <input type="text" class="form-control" placeholder="Titel" name="levels[2][level]">
    <input type="text" class="form-control" placeholder="Titel" name="levels[2][build_time]">
</form>

... to achieve that:

[levels] => Array ( 
  [0] => Array ( 
    [level] => 1 
    [build_time] => 2 
  ) 
  [1] => Array ( 
    [level] => 234 
   [build_time] => 456 
  )
  [2] => Array ( 
    [level] => 111
    [build_time] => 222 
  )
)

But if you remove one pair of inputs (dynamically, I suppose) from the middle of the form then you'll get holes in your array, unless you update the input names...

jQuery hover and class selector

If someone reads the original question to mean that they want to dynamically change the hover css and not just change the base css rule for the element, I've found this to work:

I have a dynamically loaded page that requires me to find out how high the container becomes after data is loaded. Once loaded, I want to change the hover effect of the css so that an element covers the resulting container. I need to change the css .daymark:hover rule to have a new height. This is how...

function changeAttr(attrName,changeThis,toThis){
    var mysheet=document.styleSheets[1], targetrule;
    var myrules=mysheet.cssRules? mysheet.cssRules: mysheet.rules;

    for (i=0; i<myrules.length; i++){
        if(myrules[i].selectorText.toLowerCase()==".daymark:hover"){ //find "a:hover" rule
            targetrule=myrules[i];
            break;
        }
    }
    switch(changeThis)
    {
        case "height":
            targetrule.style.height=toThis+"px";
            break;
        case "width":
            targetrule.style.width=toThis+"px";
            break;
    }

}

Create dataframe from a matrix

I've found the following "cheat" to work very neatly and error-free

> dimnames <- list(time=c(0, 0.5, 1), name=c("C_0", "C_1"))
> mat <- matrix(data, ncol=2, nrow=3, dimnames=dimnames)
> head(mat, 2) #this returns the number of rows indicated in a data frame format
> df <- data.frame(head(mat, 2)) #"data.frame" might not be necessary

Et voila!

Strip / trim all strings of a dataframe

def trim(x):
    if x.dtype == object:
        x = x.str.split(' ').str[0]
    return(x)

df = df.apply(trim)

Text Editor For Linux (Besides Vi)?

I like the versatility of jEdit (http://www.jedit.org), its got a lot of plugins, crossplatform and has also stuff like block selection which I use all the time.

The downside is, because it is written in java, it is not the fastest one.

Remove a git commit which has not been pushed

git reset --hard origin/master

to reset it to whatever the origin was at.

This was posted by @bdonlan in the comments. I added this answer for people who don't read comments.

Int to Char in C#

int i = 65;
char c = Convert.ToChar(i);

.NET End vs Form.Close() vs Application.Exit Cleaner way to close one's app

Application.Exit() kills your application but there are some instances that it won't close the application.

End is better than Application.Exit().

Disable mouse scroll wheel zoom on embedded Google Maps

This is my approach. I find it easy to implement on various websites and use it all the time

CSS and JavaScript:

<style type="text/css">
.scrolloff iframe   {
    pointer-events: none ;
}
</style>

<script type="text/javascript">
function scrollOn() {
    $('#map').removeClass('scrolloff'); // set the pointer events true on click

}

function scrollOff() {
    $('#map').addClass('scrolloff'); 

}
</script>

In the HTML, you will want to wrap the iframe in a div. <div id="map" class="scrolloff" onclick="scrollOn()" onmouseleave="scrollOff()" >

_x000D_

function scrollOn() {_x000D_
    $('#map').removeClass('scrolloff'); // set the pointer events true on click_x000D_
   _x000D_
}_x000D_
_x000D_
function scrollOff() {_x000D_
    $('#map').addClass('scrolloff'); // set the pointer events true on click_x000D_
    _x000D_
}

_x000D_

.scrolloff iframe   {_x000D_
        pointer-events: none ;_x000D_
    }

_x000D_

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>_x000D_
<div id="map" class="scrolloff" onclick="scrollOn()" onmouseleave="scrollOff()" ><iframe src="https://www.google.com/maps/embed?pb=!1m18!1m12!1m3!1d23845.03946309692!2d-70.0451736316453!3d41.66373705082399!2m3!1f0!2f0!3f0!3m2!1i1024!2i768!4f13.1!3m3!1m2!1s0x89fb159980380d21%3A0x78c040f807017e30!2sChatham+Tides!5e0!3m2!1sen!2sus!4v1452964723177" width="100%" height="450" frameborder="0" style="border:0" allowfullscreen></iframe></div>

_x000D_

Hope this helps anyone looking for a simple solution.

How to cast Object to boolean?

If the object is actually a Boolean instance, then just cast it:

boolean di = (Boolean) someObject;

The explicit cast will do the conversion to Boolean, and then there's the auto-unboxing to the primitive value. Or you can do that explicitly:

boolean di = ((Boolean) someObject).booleanValue();

If someObject doesn't refer to a Boolean value though, what do you want the code to do?

C++ int float casting

Integer division occurs, then the result, which is an integer, is assigned as a float. If the result is less than 1 then it ends up as 0.

You'll want to cast the expressions to floats first before dividing, e.g.

float m = (float)(a.y - b.y) / (float)(a.x - b.x);

Clone() vs Copy constructor- which is recommended in java

Have in mind that clone() doesn't work out of the box. You will have to implement Cloneable and override the clone() method making in public.

There are a few alternatives, which are preferable (since the clone() method has lots of design issues, as stated in other answers), and the copy-constructor would require manual work:

BeanUtils.cloneBean(original) creates a shallow clone, like the one created by Object.clone(). (this class is from commons-beanutils)
SerializationUtils.clone(original) creates a deep clone. (i.e. the whole properties graph is cloned, not only the first level) (from commons-lang), but all classes must implement Serializable
Java Deep Cloning Library offers deep cloning without the need to implement Serializable

Program "make" not found in PATH

Are you trying to run "Hello world" for the first time? Please make sure you choose proper toolchain. For Windows you have to choose MinGW GCC.

To make MinGW GCC compiler as default or change you original project with error "Program “make” not found in PATH" or "launch failed binary not found eclipse c++" when you trying to run program simply go to Windows >> Preferences >> C\C++ Build >> Tool Chain Editor >> Change Current toolchain to MinGW GCC

laravel Eloquent ORM delete() method

$model=User::where('id',$id)->delete();

Add items to comboBox in WPF

Scenario 1 - you don't have a data-source for the items
You can just populate the ComboBox with static values as follows -
From XAML:

<ComboBox Height="23" Name="comboBox1" Width="120">
        <ComboBoxItem Content="X"/>
        <ComboBoxItem Content="Y"/>
        <ComboBoxItem Content="Z"/>
</ComboBox>

Or, from CodeBehind:

private void Window_Loaded(object sender, RoutedEventArgs e)
{
    comboBox1.Items.Add("X");
    comboBox1.Items.Add("Y");
    comboBox1.Items.Add("Z");
}

Scenario 2.a - you have a data-source, and the items never get changed
You can use the data-source to populate the ComboBox. Any IEnumerable type can be used as the data-source. You need to assign it to the ItemsSource property of the ComboBox and that'll do just fine (it's up to you how you populate the IEnumerable).

Scenario 2.b - you have a data-source, and the items might get changed
You should use an ObservableCollection<T> as the data-source and assign it to the ItemsSource property of the ComboBox (it's up to you how you populate the ObservableCollection<T>). Using an ObservableCollection<T> ensures that whenever an item is added to or removed from the data-source, the change will reflect immediately on the UI.

What is the standard Python docstring format?

It's Python; anything goes. Consider how to publish your documentation. Docstrings are invisible except to readers of your source code.

People really like to browse and search documentation on the web. To achieve that, use the documentation tool Sphinx. It's the de-facto standard for documenting Python projects. The product is beautiful - take a look at https://python-guide.readthedocs.org/en/latest/ . The website Read the Docs will host your docs for free.

Angular.js: set element height on page load

It seems you require the following plugin: https://github.com/yearofmoo/AngularJS-Scope.onReady

It basically gives you the functionality to run your directive code after the your scope or data is loaded i.e. $scope.$whenReady

Pretty printing XML with javascript

var formatXml = this.formatXml = function (xml) {
        var reg = /(>)(<)(\/*)/g;
        var wsexp = / *(.*) +\n/g;
        var contexp = /(<.+>)(.+\n)/g;
        xml = xml.replace(reg, '$1\n$2$3').replace(wsexp, '$1\n').replace(contexp, '$1\n$2');
        var pad = 0;
        var formatted = '';
        var lines = xml.split('\n');
        var indent = 0;
        var lastType = 'other';

Passing argument to alias in bash

An alias will expand to the string it represents. Anything after the alias will appear after its expansion without needing to be or able to be passed as explicit arguments (e.g. $1).

$ alias foo='/path/to/bar'
$ foo some args

will get expanded to

$ /path/to/bar some args

If you want to use explicit arguments, you'll need to use a function

$ foo () { /path/to/bar "$@" fixed args; }
$ foo abc 123

will be executed as if you had done

$ /path/to/bar abc 123 fixed args

To undefine an alias:

unalias foo

To undefine a function:

unset -f foo

To see the type and definition (for each defined alias, keyword, function, builtin or executable file):

type -a foo

Or type only (for the highest precedence occurrence):

type -t foo

Java String to SHA1

UPDATE
You can use Apache Commons Codec (version 1.7+) to do this job for you.

DigestUtils.sha1Hex(stringToConvertToSHexRepresentation)

Thanks to @Jon Onstott for this suggestion.

Old Answer
Convert your Byte Array to Hex String. Real's How To tells you how.

return byteArrayToHexString(md.digest(convertme))

and (copied from Real's How To)

public static String byteArrayToHexString(byte[] b) {
  String result = "";
  for (int i=0; i < b.length; i++) {
    result +=
          Integer.toString( ( b[i] & 0xff ) + 0x100, 16).substring( 1 );
  }
  return result;
}

BTW, you may get more compact representation using Base64. Apache Commons Codec API 1.4, has this nice utility to take away all the pain. refer here

Twitter bootstrap 3 two columns full height

So it seems your best option is going with the padding-bottom countered by negative margin-bottom strategy.

I made two examples. One with <header> inside .container, and another with it outside.

Both versions should work properly. Note the use of the following @media query so that it removes the extra padding on smaller screens...

@media screen and (max-width:991px) {
    .content { padding-top:0; }
}

Other than that, those examples should fix your problem.

How to watch and compile all TypeScript sources?

Create a file named tsconfig.json in your project root and include following lines in it:

{
    "compilerOptions": {
        "emitDecoratorMetadata": true,
        "module": "commonjs",
        "target": "ES5",
        "outDir": "ts-built",
        "rootDir": "src"
    }
}

Please note that outDir should be the path of the directory to receive compiled JS files, and rootDir should be the path of the directory containing your source (.ts) files.

Open a terminal and run tsc -w, it'll compile any .ts file in src directory into .js and store them in ts-built directory.

How do I remove a substring from the end of a string in Python?

import re

def rm_suffix(url = 'abcdc.com', suffix='\.com'):
    return(re.sub(suffix+'$', '', url))

I want to repeat this answer as the most expressive way to do it. Of course, the following would take less CPU time:

def rm_dotcom(url = 'abcdc.com'):
    return(url[:-4] if url.endswith('.com') else url)

However, if CPU is the bottle neck why write in Python?

When is CPU a bottle neck anyway? In drivers, maybe.

The advantages of using regular expression is code reusability. What if you next want to remove '.me', which only has three characters?

Same code would do the trick:

>>> rm_sub('abcdc.me','.me')
'abcdc'

Waiting for another flutter command to release the startup lock

Nothing of ALL these answers didn't helped me.

The only one solution was to remove whole flutter stuff (and reinstall flutter from git):

<flutter directory>
<user>/.flutter_tool_state
<user>/.dart
<user>/.pub-cache
<user>/.dartServer
<user>/.flutter

pandas DataFrame: replace nan values with average of columns

# To read data from csv file
Dataset = pd.read_csv('Data.csv')

X = Dataset.iloc[:, :-1].values

# To calculate mean use imputer class
from sklearn.impute import SimpleImputer
imputer = SimpleImputer(missing_values=np.nan, strategy='mean')
imputer = imputer.fit(X[:, 1:3])
X[:, 1:3] = imputer.transform(X[:, 1:3])

Using $_POST to get select option value from HTML

Use this way:

$selectOption = $_POST['taskOption'];

But it is always better to give values to your <option> tags.

<select name="taskOption">
  <option value="1">First</option>
  <option value="2">Second</option>
  <option value="3">Third</option>
</select>

AngularJS $resource RESTful example

$resource was meant to retrieve data from an endpoint, manipulate it and send it back. You've got some of that in there, but you're not really leveraging it for what it was made to do.

It's fine to have custom methods on your resource, but you don't want to miss out on the cool features it comes with OOTB.

EDIT: I don't think I explained this well enough originally, but $resource does some funky stuff with returns. Todo.get() and Todo.query() both return the resource object, and pass it into the callback for when the get completes. It does some fancy stuff with promises behind the scenes that mean you can call $save() before the get() callback actually fires, and it will wait. It's probably best just to deal with your resource inside of a promise then() or the callback method.

Standard use

var Todo = $resource('/api/1/todo/:id');

//create a todo
var todo1 = new Todo();
todo1.foo = 'bar';
todo1.something = 123;
todo1.$save();

//get and update a todo
var todo2 = Todo.get({id: 123});
todo2.foo += '!';
todo2.$save();

//which is basically the same as...
Todo.get({id: 123}, function(todo) {
   todo.foo += '!';
   todo.$save();
});

//get a list of todos
Todo.query(function(todos) {
  //do something with todos
  angular.forEach(todos, function(todo) {
     todo.foo += ' something';
     todo.$save();
  });
});

//delete a todo
Todo.$delete({id: 123});

Likewise, in the case of what you posted in the OP, you could get a resource object and then call any of your custom functions on it (theoretically):

var something = src.GetTodo({id: 123});
something.foo = 'hi there';
something.UpdateTodo();

I'd experiment with the OOTB implementation before I went and invented my own however. And if you find you're not using any of the default features of $resource, you should probably just be using $http on it's own.

Update: Angular 1.2 and Promises

As of Angular 1.2, resources support promises. But they didn't change the rest of the behavior.

To leverage promises with $resource, you need to use the $promise property on the returned value.

Example using promises

var Todo = $resource('/api/1/todo/:id');

Todo.get({id: 123}).$promise.then(function(todo) {
   // success
   $scope.todos = todos;
}, function(errResponse) {
   // fail
});

Todo.query().$promise.then(function(todos) {
   // success
   $scope.todos = todos;
}, function(errResponse) {
   // fail
});

Just keep in mind that the $promise property is a property on the same values it was returning above. So you can get weird:

These are equivalent

var todo = Todo.get({id: 123}, function() {
   $scope.todo = todo;
});

Todo.get({id: 123}, function(todo) {
   $scope.todo = todo;
});

Todo.get({id: 123}).$promise.then(function(todo) {
   $scope.todo = todo;
});

var todo = Todo.get({id: 123});
todo.$promise.then(function() {
   $scope.todo = todo;
});

mongodb, replicates and error: { "$err" : "not master and slaveOk=false", "code" : 13435 }

in mongodb2.0

you should type

rs.slaveOk()

in secondary mongod node

How to get the unix timestamp in C#

When you subtract 1970 from the current time, be aware that the timespan will most often have a non zero milliseconds field. If for some reason you are interested in the milliseconds, keep this in mind.

Here's what I did to get around this issue.

 DateTime now = UtcNow();

 // milliseconds Not included.
 DateTime nowToTheSecond = new DateTime(now.Year,now.Month,now.Day,now.Hour,now.Minute,now.Second); 

 TimeSpan span = (date - new DateTime(1970, 1, 1, 0, 0, 0, 0));

 Assert.That(span.Milliseconds, Is.EqualTo(0)); // passes.

How to add a border to a widget in Flutter?

You can use Container to contain your widget:

Container(
  decoration: BoxDecoration(
    border: Border.all(
    color: Color(0xff000000),
    width: 1,
  )),
  child: Text()
),

Best way to require all files from a directory in ruby?

If it's a directory relative to the file that does the requiring (e.g. you want to load all files in the lib directory):

Dir[File.dirname(__FILE__) + '/lib/*.rb'].each {|file| require file }

Edit: Based on comments below, an updated version:

Dir[File.join(__dir__, 'lib', '*.rb')].each { |file| require file }

How to tell if homebrew is installed on Mac OS X

In my case Mac OS High Sierra 10.13.6

brew -v

OutPut-
Homebrew 2.2.2
Homebrew/homebrew-core (git revision 71aa; last commit 2020-01-07)
Homebrew/homebrew-cask (git revision 84f00; last commit 2020-01-07)

Laravel Blade html image

Had the same problem with laravel 5.3... This is how I did it and very easy. for example logo in the blade page view

****<image img src="/img/logo.png" alt="Logo"></image>****

How to make a page redirect using JavaScript?

You can append the values in the query string for the next page to see and process. You can wrap them inside the link tags:

<a href="your_page.php?var1=value1&var2=value2">

You separate each of those values with the & sign.

Or you can create this on a button click like this:

<input type="button" onclick="document.location.href = 'your_page.php?var1=value1&var2=value2';">

Laravel 4 Eloquent Query Using WHERE with OR AND OR?

Make use of Parameter Grouping (Laravel 4.2). For your example, it'd be something like this:

Model::where(function ($query) {
    $query->where('a', '=', 1)
          ->orWhere('b', '=', 1);
})->where(function ($query) {
    $query->where('c', '=', 1)
          ->orWhere('d', '=', 1);
});

Programs & Examples On #Iso8583

If input field is empty, disable submit button

How to get row number from selected rows in Oracle

How to add a response header on nginx when using proxy_pass?

Hide response header and then add a new custom header value

UPDATE:

How to run html file using node js

Angular 4 - Select default value in dropdown [Reactive Forms]

What is the meaning of prepended double colon "::"?

How to filter data in dataview

How to concatenate strings with padding in sqlite

Illegal pattern character 'T' when parsing a date string to java.util.Date

How to put two divs side by side

remove first element from array and return the array minus the first element

How to unbind a listener that is calling event.preventDefault() (using jQuery)?

return string with first match Regex

Remove last character from C++ string

How to change options of <select> with jQuery?

Spring 3 MVC resources and tag <mvc:resources />

assignment operator overloading in c++

Deleting DataFrame row in Pandas based on column value

Uninstall Django completely

Plot a legend outside of the plotting area in base graphics?

Serialize and Deserialize Json and Json Array in Unity

How can I determine the character encoding of an excel file?

How to localise a string inside the iOS info.plist file?

Adding an onclick function to go to url in JavaScript?

How to convert a 3D point into 2D perspective projection?

How do I use ROW_NUMBER()?

Adding Text to DataGridView Row Header

Understanding INADDR_ANY for socket programming

BarCode Image Generator in Java

Filtering DataSet

Reverting to a specific commit based on commit id with Git?

With block equivalent in C#?

How do I upload a file with the JS fetch API?

How to find all trigger associated with a table with SQL Server?

How to get a context in a recycler view adapter

"Templates can be used only with field access, property access, single-dimension array index, or single-parameter custom indexer expressions" error

How to share data between different threads In C# using AOP?

How to make 'submit' button disabled?

Get the time of a datetime using T-SQL?

How to replace multiple patterns at once with sed?

Git merge without auto commit

Select multiple value in DropDownList using ASP.NET and C#

I can not find my.cnf on my windows computer

Push local Git repo to new remote including all branches and tags

nginx - nginx: [emerg] bind() to [::]:80 failed (98: Address already in use)

HTTP response code for POST when resource already exists

C# version of java's synchronized keyword?

How to form tuple column from two columns in Pandas

What is the best Java library to use for HTTP POST, GET etc.?

SyntaxError: missing ; before statement

Default Xmxsize in Java 8 (max heap size)

/usr/bin/ld: cannot find

The difference between fork(), vfork(), exec() and clone()

Go to URL after OK button if alert is pressed

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

Removing viewcontrollers from navigation stack

Angular ng-repeat add bootstrap row every 3 or 4 cols

Change border color on <select> HTML form

How to get the IP address of the server on which my C# application is running on?

PHP calculate age

How does OkHttp get Json string?

What is meant with "const" at end of function declaration?

How to detect if user select cancel InputBox VBA Excel

Full examples of using pySerial package

Flutter: Run method on Widget build complete

String to date in Oracle with milliseconds

Recursive sub folder search and return files in a list python

Pointtype command for gnuplot

Call to undefined function curl_init().?

How to get access to raw resources that I put in res folder?

Converting EditText to int? (Android)

Swift: declare an empty dictionary

Angular ng-class if else

Is it possible to add an HTML link in the body of a MAILTO link

How to correctly set Http Request Header in Angular 2

laravel 5.5 The page has expired due to inactivity. Please refresh and try again

How to create a static library with g++?