#Ejb jar.xml | Programs & Examples on Ejb jar.xml

Algorithm to detect overlapping periods

This is my solution:

public static bool OverlappingPeriods(DateTime aStart, DateTime aEnd,
                                      DateTime bStart, DateTime bEnd)
{
    if (aStart > aEnd)
        throw new ArgumentException("A start can not be after its end.");

    if(bStart > bEnd)
        throw new ArgumentException("B start can not be after its end.");

    return !((aEnd < bStart && aStart < bStart) ||
                (bEnd < aStart && bStart < aStart));
}

I unit tested it with 100% coverage.

Writing html form data to a txt file without the use of a webserver

I know this is old, but it's the first example of saving form data to a txt file I found in a quick search. So I've made a couple edits to the above code that makes it work more smoothly. It's now easier to add more fields, including the radio button as @user6573234 requested.

https://jsfiddle.net/cgeiser/m0j7Lwyt/1/

<!DOCTYPE html>
<html>
<head>
<style>
form * {
  display: block;
  margin: 10px;
}
</style>
<script language="Javascript" >
function download() {
  var filename = window.document.myform.docname.value;
  var name =  window.document.myform.name.value;
  var text =  window.document.myform.text.value;
  var problem =  window.document.myform.problem.value;
  
  var pom = document.createElement('a');
  pom.setAttribute('href', 'data:text/plain;charset=utf-8,' + 
    "Your Name: " + encodeURIComponent(name) + "\n\n" +
    "Problem: " + encodeURIComponent(problem) + "\n\n" +
    encodeURIComponent(text)); 

  pom.setAttribute('download', filename);

  pom.style.display = 'none';
  document.body.appendChild(pom);

  pom.click();

  document.body.removeChild(pom);
}
</script>
</head>
<body>
<form name="myform" method="post" >
  <input type="text" id="docname" value="test.txt" />
  <input type="text" id="name" placeholder="Your Name" />
  <div style="display:unblock">
    Option 1 <input type="radio" value="Option 1" onclick="getElementById('problem').value=this.value; getElementById('problem').show()" style="display:inline" />
    Option 2 <input type="radio" value="Option 2" onclick="getElementById('problem').value=this.value;" style="display:inline" />
    <input type="text" id="problem" />
  </div>
  <textarea rows=3 cols=50 id="text" />Please type in this box. 
When you click the Download button, the contents of this box will be downloaded to your machine at the location you specify. Pretty nifty. </textarea>
  
  <input id="download_btn" type="submit" class="btn" style="width: 125px" onClick="download();" />
  
</form>
</body>
</html>

How to copy sheets to another workbook using vba?

    Workbooks.Open Filename:="Path(Ex: C:\Reports\ClientWiseReport.xls)"ReadOnly:=True


    For Each Sheet In ActiveWorkbook.Sheets

        Sheet.Copy After:=ThisWorkbook.Sheets(1)

    Next Sheet

Propagation Delay vs Transmission delay

Obviously , packet length * propagation delay = trasmission delay is wrong.

Let us assume that you have a packet which has 4 bits 1010.You have to send it from A to B.

For this scenario,Transmission delay is the time taken by the sender to place the packet on the link(Transmission medium).Because the bits(1010) has to be converted in to signals.So it takes some time.Note that here only the packet is placed.It is not moving to receiver.

Propagation delay is the time taken by a bit(Mostly MSB ,Here 1) to reach from sender(A) to receiver(B).

Having links relative to root?

To give a URL to an image tag which locates images/ directory in the root like

`logo.png`

you should give src URL starting with / as follows:

<img src="/images/logo.png"/>

This code works in any directories without any troubles even if you are in branches/europe/about.php still the logo can be seen right there.

How to convert a Title to a URL slug in jQuery?

Yet another one. Short and keeps special characters:

imaginação é mato => imaginacao-e-mato

function slugify (text) {
  const a = 'àáäâãèéëêìíïîòóöôùúüûñçßÿœærsn?????u?z?·/_,:;'
  const b = 'aaaaaeeeeiiiioooouuuuncsyoarsnpwgnmuxzh------'
  const p = new RegExp(a.split('').join('|'), 'g')

  return text.toString().toLowerCase()
    .replace(/\s+/g, '-')           // Replace spaces with -
    .replace(p, c =>
        b.charAt(a.indexOf(c)))     // Replace special chars
    .replace(/&/g, '-and-')         // Replace & with 'and'
    .replace(/[^\w\-]+/g, '')       // Remove all non-word chars
    .replace(/\-\-+/g, '-')         // Replace multiple - with single -
    .replace(/^-+/, '')             // Trim - from start of text
    .replace(/-+$/, '')             // Trim - from end of text
}

Removing items from a ListBox in VB.net

This worked for me.

Private Sub listbox_MouseDoubleClick(sender As Object, e As MouseEventArgs) 
        Handles listbox.MouseDoubleClick
        listbox.Items.RemoveAt(listbox.SelectedIndex.ToString())
    End Sub

Can't connect to MySQL server on 'localhost' (10061)

finally solved this.. try running mysql in xammp. The check box of mysql in xammp should be unclicked. then start it. after that you can open now mysql and it will now connect to the localhost

Can I export a variable to the environment from a bash script without sourcing it?

Execute

set -o allexport

Any variables you source from a file after this will be exported in your shell.

source conf-file

When you're done execute. This will disable allexport mode.

set +o allexport

How to ignore SSL certificate errors in Apache HttpClient 4.0

If you encountered this problem when using AmazonS3Client, which embeds Apache HttpClient 4.1, you simply need to define a system property like this so that the SSL cert checker is relaxed:

-Dcom.amazonaws.sdk.disableCertChecking=true

Mischief managed

c# razor url parameter from view

I've found the solution in this thread

@(ViewContext.RouteData.Values["parameterName"])

What's the difference between returning value or Promise.resolve from then()

Both of your examples should behave pretty much the same.

A value returned inside a then() handler becomes the resolution value of the promise returned from that then(). If the value returned inside the .then is a promise, the promise returned by then() will "adopt the state" of that promise and resolve/reject just as the returned promise does.

In your first example, you return "bbb" in the first then() handler, so "bbb" is passed into the next then() handler.

In your second example, you return a promise that is immediately resolved with the value "bbb", so "bbb" is passed into the next then() handler. (The Promise.resolve() here is extraneous).

The outcome is the same.

If you can show us an example that actually exhibits different behavior, we can tell you why that is happening.

What is the best way to determine a session variable is null or empty in C#?

That is pretty much how you do it. However, there is a shorter syntax you can use.

sSession = (string)Session["variable"] ?? "set this";

This is saying if the session variables is null, set sSession to "set this"

PHP write file from input to txt

A possible solution:

<?php
$txt = "data.txt"; 
if (isset($_POST['field1']) && isset($_POST['field2'])) { // check if both fields are set
    $fh = fopen($txt, 'a'); 
    $txt=$_POST['field1'].' - '.$_POST['field2']; 
    fwrite($fh,$txt); // Write information to the file
    fclose($fh); // Close the file
}
?>

You were closing the script before close de file.

How can I ping a server port with PHP?

Try this :

echo exec('ping -n 1 -w 1 72.10.169.28');

Force the origin to start at 0

Simply add these to your ggplot:

+ scale_x_continuous(expand = c(0, 0), limits = c(0, NA)) + 
  scale_y_continuous(expand = c(0, 0), limits = c(0, NA))

Example

df <- data.frame(x = 1:5, y = 1:5)
p <- ggplot(df, aes(x, y)) + geom_point()
p <- p + expand_limits(x = 0, y = 0)
p # not what you are looking for


p + scale_x_continuous(expand = c(0, 0), limits = c(0,NA)) + 
  scale_y_continuous(expand = c(0, 0), limits = c(0, NA))

Lastly, take great care not to unintentionally exclude data off your chart. For example, a position = 'dodge' could cause a bar to get left off the chart entirely (e.g. if its value is zero and you start the axis at zero), so you may not see it and may not even know it's there. I recommend plotting data in full first, inspect, then use the above tip to improve the plot's aesthetics.

An invalid form control with name='' is not focusable

It can be that you have hidden (display: none) fields with the required attribute.

Please check all required fields are visible to the user :)

How to install a package inside virtualenv?

Sharing a personal case if it helps. It is that a virtual environment was previously arranged. Its path can be displayed by

echo $VIRTUAL_ENV

Make sure that the it is writable to the current user. If not, using

sudo ipython

would certainly clear off the warning message.

In anaconda, if $VIRTUAL_ENV is independently arranged, one can simply delete this folder or rename it, and then restart the shell. Anaconda will recover to its default setup.

pip install from git repo branch

Prepend the url prefix git+ (See VCS Support):

pip install git+https://github.com/tangentlabs/django-oscar-paypal.git@issue/34/oscar-0.6

And specify the branch name without the leading /.

Git - how delete file from remote repository

if you just commit your deleted file and push. It should then be removed from the remote repo.

Using the RUN instruction in a Dockerfile with 'source' does not work

According to https://docs.docker.com/engine/reference/builder/#run the default [Linux] shell for RUN is /bin/sh -c. You appear to be expecting bashisms, so you should use the "exec form" of RUN to specify your shell.

RUN ["/bin/bash", "-c", "source /usr/local/bin/virtualenvwrapper.sh"]

Otherwise, using the "shell form" of RUN and specifying a different shell results in nested shells.

# don't do this...
RUN /bin/bash -c "source /usr/local/bin/virtualenvwrapper.sh"
# because it is the same as this...
RUN ["/bin/sh", "-c", "/bin/bash" "-c" "source /usr/local/bin/virtualenvwrapper.sh"]

If you have more than 1 command that needs a different shell, you should read https://docs.docker.com/engine/reference/builder/#shell and change your default shell by placing this before your RUN commands:

SHELL ["/bin/bash", "-c"]

Finally, if you have placed anything in the root user's .bashrc file that you need, you can add the -l flag to the SHELL or RUN command to make it a login shell and ensure that it gets sourced.

Note: I have intentionally ignored the fact that it is pointless to source a script as the only command in a RUN.

What does appending "?v=1" to CSS and JavaScript URLs in link and script tags do?

Javascript files are often cached by the browser for a lot longer than you might expect.

This can often result in unexpected behaviour when you release a new version of your JS file.

Therefore, it is common practice to add a QueryString parameter to the URL for the javascript file. That way, the browser caches the Javascript file with v=1. When you release a new version of your javascript file you change the url's to v=2 and the browser will be forced to download a new copy.

Can someone explain Microsoft Unity?

I am covering most of the examples of Dependency Injection in ASP.NET Web API 2

public interface IShape
{
    string Name { get; set; }
}

public class NoShape : IShape
{
    public string Name { get; set; } = "I have No Shape";
}

public class Circle : IShape
{
    public string Name { get; set; } = "Circle";
}

public class Rectangle : IShape
{
    public Rectangle(string name)
    {
        this.Name = name;
    }

    public string Name { get; set; } = "Rectangle";
}

In DIAutoV2Controller.cs Auto Injection mechanism is used

[RoutePrefix("api/v2/DIAutoExample")]
public class DIAutoV2Controller : ApiController
{
    private string ConstructorInjected;
    private string MethodInjected1;
    private string MethodInjected2;
    private string MethodInjected3;

    [Dependency]
    public IShape NoShape { get; set; }

    [Dependency("Circle")]
    public IShape ShapeCircle { get; set; }

    [Dependency("Rectangle")]
    public IShape ShapeRectangle { get; set; }

    [Dependency("PiValueExample1")]
    public double PiValue { get; set; }

    [InjectionConstructor]
    public DIAutoV2Controller([Dependency("Circle")]IShape shape1, [Dependency("Rectangle")]IShape shape2, IShape shape3)
    {
        this.ConstructorInjected = shape1.Name + " & " + shape2.Name + " & " + shape3.Name;
    }

    [NonAction]
    [InjectionMethod]
    public void Initialize()
    {
        this.MethodInjected1 = "Default Initialize done";
    }

    [NonAction]
    [InjectionMethod]
    public void Initialize2([Dependency("Circle")]IShape shape1)
    {
        this.MethodInjected2 = shape1.Name;
    }

    [NonAction]
    [InjectionMethod]
    public void Initialize3(IShape shape1)
    {
        this.MethodInjected3 = shape1.Name;
    }

    [HttpGet]
    [Route("constructorinjection")]
    public string constructorinjection()
    {
        return "Constructor Injected: " + this.ConstructorInjected;
    }

    [HttpGet]
    [Route("GetNoShape")]
    public string GetNoShape()
    {
        return "Property Injected: " + this.NoShape.Name;
    }

    [HttpGet]
    [Route("GetShapeCircle")]
    public string GetShapeCircle()
    {
        return "Property Injected: " + this.ShapeCircle.Name;
    }

    [HttpGet]
    [Route("GetShapeRectangle")]
    public string GetShapeRectangle()
    {
        return "Property Injected: " + this.ShapeRectangle.Name;
    }

    [HttpGet]
    [Route("GetPiValue")]
    public string GetPiValue()
    {
        return "Property Injected: " + this.PiValue;
    }

    [HttpGet]
    [Route("MethodInjected1")]
    public string InjectionMethod1()
    {
        return "Method Injected: " + this.MethodInjected1;
    }

    [HttpGet]
    [Route("MethodInjected2")]
    public string InjectionMethod2()
    {
        return "Method Injected: " + this.MethodInjected2;
    }

    [HttpGet]
    [Route("MethodInjected3")]
    public string InjectionMethod3()
    {
        return "Method Injected: " + this.MethodInjected3;
    }
}

In DIV2Controller.cs everything will be injected from the Dependency Configuration Resolver class

[RoutePrefix("api/v2/DIExample")]
public class DIV2Controller : ApiController
{
    private string ConstructorInjected;
    private string MethodInjected1;
    private string MethodInjected2;
    public string MyPropertyName { get; set; }
    public double PiValue1 { get; set; }
    public double PiValue2 { get; set; }
    public IShape Shape { get; set; }

    // MethodInjected
    [NonAction]
    public void Initialize()
    {
        this.MethodInjected1 = "Default Initialize done";
    }

    // MethodInjected
    [NonAction]
    public void Initialize2(string myproperty1, IShape shape1, string myproperty2, IShape shape2)
    {
        this.MethodInjected2 = myproperty1 + " & " + shape1.Name + " & " + myproperty2 + " & " + shape2.Name;
    }

    public DIV2Controller(string myproperty1, IShape shape1, string myproperty2, IShape shape2)
    {
        this.ConstructorInjected = myproperty1 + " & " + shape1.Name + " & " + myproperty2 + " & " + shape2.Name;
    }

    [HttpGet]
    [Route("constructorinjection")]
    public string constructorinjection()
    {
        return "Constructor Injected: " + this.ConstructorInjected;
    }

    [HttpGet]
    [Route("PropertyInjected")]
    public string InjectionProperty()
    {
        return "Property Injected: " + this.MyPropertyName;
    }

    [HttpGet]
    [Route("GetPiValue1")]
    public string GetPiValue1()
    {
        return "Property Injected: " + this.PiValue1;
    }

    [HttpGet]
    [Route("GetPiValue2")]
    public string GetPiValue2()
    {
        return "Property Injected: " + this.PiValue2;
    }

    [HttpGet]
    [Route("GetShape")]
    public string GetShape()
    {
        return "Property Injected: " + this.Shape.Name;
    }

    [HttpGet]
    [Route("MethodInjected1")]
    public string InjectionMethod1()
    {
        return "Method Injected: " + this.MethodInjected1;
    }

    [HttpGet]
    [Route("MethodInjected2")]
    public string InjectionMethod2()
    {
        return "Method Injected: " + this.MethodInjected2;
    }
}

Configuring the Dependency Resolver

public static void Register(HttpConfiguration config)
{
    var container = new UnityContainer();
    RegisterInterfaces(container);
    config.DependencyResolver = new UnityResolver(container);

    // Other Web API configuration not shown.
}

private static void RegisterInterfaces(UnityContainer container)
{
    var dbContext = new SchoolDbContext();
    // Registration with constructor injection
    container.RegisterType<IStudentRepository, StudentRepository>(new InjectionConstructor(dbContext));
    container.RegisterType<ICourseRepository, CourseRepository>(new InjectionConstructor(dbContext));

    // Set constant/default value of Pi = 3.141 
    container.RegisterInstance<double>("PiValueExample1", 3.141);
    container.RegisterInstance<double>("PiValueExample2", 3.14);

    // without a name
    container.RegisterInstance<IShape>(new NoShape());

    // with circle name
    container.RegisterType<IShape, Circle>("Circle", new InjectionProperty("Name", "I am Circle"));

    // with rectangle name
    container.RegisterType<IShape, Rectangle>("Rectangle", new InjectionConstructor("I am Rectangle"));

    // Complex type like Constructor, Property and method injection
    container.RegisterType<DIV2Controller, DIV2Controller>(
        new InjectionConstructor("Constructor Value1", container.Resolve<IShape>("Circle"), "Constructor Value2", container.Resolve<IShape>()),
        new InjectionMethod("Initialize"),
        new InjectionMethod("Initialize2", "Value1", container.Resolve<IShape>("Circle"), "Value2", container.Resolve<IShape>()),
        new InjectionProperty("MyPropertyName", "Property Value"),
        new InjectionProperty("PiValue1", container.Resolve<double>("PiValueExample1")),
        new InjectionProperty("Shape", container.Resolve<IShape>("Rectangle")),
        new InjectionProperty("PiValue2", container.Resolve<double>("PiValueExample2")));
}

Convert a string representation of a hex dump to a byte array using Java?

For what it's worth, here's another version which supports odd length strings, without resorting to string concatenation.

public static byte[] hexStringToByteArray(String input) {
    int len = input.length();

    if (len == 0) {
        return new byte[] {};
    }

    byte[] data;
    int startIdx;
    if (len % 2 != 0) {
        data = new byte[(len / 2) + 1];
        data[0] = (byte) Character.digit(input.charAt(0), 16);
        startIdx = 1;
    } else {
        data = new byte[len / 2];
        startIdx = 0;
    }

    for (int i = startIdx; i < len; i += 2) {
        data[(i + 1) / 2] = (byte) ((Character.digit(input.charAt(i), 16) << 4)
                + Character.digit(input.charAt(i+1), 16));
    }
    return data;
}

Add a summary row with totals

If you are on SQL Server 2008 or later version, you can use the ROLLUP() GROUP BY function:

SELECT
  Type = ISNULL(Type, 'Total'),
  TotalSales = SUM(TotalSales)
FROM atable
GROUP BY ROLLUP(Type)
;

This assumes that the Type column cannot have NULLs and so the NULL in this query would indicate the rollup row, the one with the grand total. However, if the Type column can have NULLs of its own, the more proper type of accounting for the total row would be like in @Declan_K's answer, i.e. using the GROUPING() function:

SELECT
  Type = CASE GROUPING(Type) WHEN 1 THEN 'Total' ELSE Type END,
  TotalSales = SUM(TotalSales)
FROM atable
GROUP BY ROLLUP(Type)
;

Set line spacing

Try the line-height property.

For example, 12px font-size and 4px distant from the bottom and upper lines:

line-height: 20px; /* 4px +12px + 4px */

Or with em units

line-height: 1.7em; /* 1em = 12px in this case. 20/12 == 1.666666  */

PHP MySQL Query Where x = $variable

What you are doing right now is you are adding . on the string and not concatenating. It should be,

$result = mysqli_query($con,"SELECT `note` FROM `glogin_users` WHERE email = '".$email."'");

or simply

$result = mysqli_query($con,"SELECT `note` FROM `glogin_users` WHERE email = '$email'");

Efficient way to update all rows in a table

As Marcelo suggests:

UPDATE mytable
SET new_column = <expr containing old_column>;

If this takes too long and fails due to "snapshot too old" errors (e.g. if the expression queries another highly-active table), and if the new value for the column is always NOT NULL, you could update the table in batches:

UPDATE mytable
SET new_column = <expr containing old_column>
WHERE new_column IS NULL
AND ROWNUM <= 100000;

Just run this statement, COMMIT, then run it again; rinse, repeat until it reports "0 rows updated". It'll take longer but each update is less likely to fail.

EDIT:

A better alternative that should be more efficient is to use the DBMS_PARALLEL_EXECUTE API.

Sample code (from Oracle docs):

DECLARE
  l_sql_stmt VARCHAR2(1000);
  l_try NUMBER;
  l_status NUMBER;
BEGIN

  -- Create the TASK
  DBMS_PARALLEL_EXECUTE.CREATE_TASK ('mytask');

  -- Chunk the table by ROWID
  DBMS_PARALLEL_EXECUTE.CREATE_CHUNKS_BY_ROWID('mytask', 'HR', 'EMPLOYEES', true, 100);

  -- Execute the DML in parallel
  l_sql_stmt := 'update EMPLOYEES e 
      SET e.salary = e.salary + 10
      WHERE rowid BETWEEN :start_id AND :end_id';
  DBMS_PARALLEL_EXECUTE.RUN_TASK('mytask', l_sql_stmt, DBMS_SQL.NATIVE,
                                 parallel_level => 10);

  -- If there is an error, RESUME it for at most 2 times.
  l_try := 0;
  l_status := DBMS_PARALLEL_EXECUTE.TASK_STATUS('mytask');
  WHILE(l_try < 2 and l_status != DBMS_PARALLEL_EXECUTE.FINISHED) 
  LOOP
    l_try := l_try + 1;
    DBMS_PARALLEL_EXECUTE.RESUME_TASK('mytask');
    l_status := DBMS_PARALLEL_EXECUTE.TASK_STATUS('mytask');
  END LOOP;

  -- Done with processing; drop the task
  DBMS_PARALLEL_EXECUTE.DROP_TASK('mytask');

END;
/

Oracle Docs: https://docs.oracle.com/database/121/ARPLS/d_parallel_ex.htm#ARPLS67333

Pass PDO prepared statement to variables

Instead of using ->bindParam() you can pass the data only at the time of ->execute():

$data = [   ':item_name' => $_POST['item_name'],   ':item_type' => $_POST['item_type'],   ':item_price' => $_POST['item_price'],   ':item_description' => $_POST['item_description'],   ':image_location' => 'images/'.$_FILES['file']['name'],   ':status' => 0,   ':id' => 0, ];  $stmt->execute($data);

In this way you would know exactly what values are going to be sent.

How to use ADB Shell when Multiple Devices are connected? Fails with "error: more than one device and emulator"

User @janot has already mentioned this above, but this took me some time to filter the best solution.

There are two Broad use cases:

1) 2 hardware are connected, first is emulator and other is a Device.
Solution : adb -e shell....whatever-command for emulator and adb -d shell....whatever-command for device.

2) n number of devices are connected (all emulators or Phones/Tablets) via USB/ADB-WiFi:

Solution: Step1) run adb devices THis will give you list of devices currently connected (via USB or ADBoverWiFI)
Step2) now run adb -s <device-id/IP-address> shell....whatever-command no matter how many devices you have.

Example
to clear app data on a device connected on wifi ADB I would execute:
adb -s 172.16.34.89:5555 shell pm clear com.package-id

to clear app data connected on my usb connected device I would execute:
adb -s 5210d21be2a5643d shell pm clear com.package-id

Content-Disposition:What are the differences between "inline" and "attachment"?

If it is inline, the browser should attempt to render it within the browser window. If it cannot, it will resort to an external program, prompting the user.

With attachment, it will immediately go to the user, and not try to load it in the browser, whether it can or not.

How can I find and run the keytool

Few observations while I was getting the same problem (Windows). 1. Shell pipe is important. 2. If you are using OpenSSL or Cygwin, definitely you have to install it. 3. keytool comes with JDK so either you have to point to it in the command or you have cd to the JDK/bin folder (where the exe resides) 4. The debug keystore is typically located at ~/.android/debug.keystore 5. password is "android" whether you -keypass it or type it when prompted. 6. For the alias name, you can open (DO NOT SAVE, just open and close) the keystore file with any editor and read it. 7. MOST IMPORTANT - There is a difference is specifying the keystore path within quotes and without. I got it working by using the keystore path within the double quotes. As remix090378 said and as per the instruction, this command indeed worked - cd C:\Program Files\Java\jdk1.7.0_09\bin

keytool -exportcert -alias androiddebugkey -keystore "C:\Users\userName.android\debug.keystore" -list -v

How to set up Automapper in ASP.NET Core

Asp.Net Core 2.2 with AutoMapper.Extensions.Microsoft.DependencyInjection.

public class MappingProfile : Profile
{
  public MappingProfile()
  {
      CreateMap<Domain, DomainDto>();
  }
}

In Startup.cs

services.AddAutoMapper(typeof(List.Handler));

Using app.config in .Net Core

I have a .Net Core 3.1 MSTest project with similar issue. This post provided clues to fix it.

Breaking this down to a simple answer for .Net core 3.1:

add/ensure nuget package: System.Configuration.ConfigurationManager to project
add your app.config(xml) to project.

If it is a MSTest project:

rename file in project to testhost.dll.config

OR
Use post-build command provided by DeepSpace101

Understanding Chrome network log "Stalled" state

Google gives a breakdown of these fields in the Evaluating network performance section of their DevTools documentation.

Excerpt from Resource network timing:

Stalled/Blocking

Time the request spent waiting before it could be sent. This time is inclusive of any time spent in proxy negotiation. Additionally, this time will include when the browser is waiting for an already established connection to become available for re-use, obeying Chrome's maximum six TCP connection per origin rule.

(If you forget, Chrome has an "Explanation" link in the hover tooltip and under the "Timing" panel.)

Basically, the primary reason you will see this is because Chrome will only download 6 files per-server at a time and other requests will be stalled until a connection slot becomes available.

This isn't necessarily something that needs fixing, but one way to avoid the stalled state would be to distribute the files across multiple domain names and/or servers, keeping CORS in mind if applicable to your needs, however HTTP2 is probably a better option going forward. Resource bundling (like JS and CSS concatenation) can also help to reduce amount of stalled connections.

Pythonic way to check if a file exists?

This was the best way for me. You can retrieve all existing files (be it symbolic links or normal):

os.path.lexists(path)

Return True if path refers to an existing path. Returns True for broken symbolic links. Equivalent to exists() on platforms lacking os.lstat().

New in version 2.4.

Laravel-5 'LIKE' equivalent (Eloquent)

I have scopes for this, hope it help somebody. https://laravel.com/docs/master/eloquent#local-scopes

public function scopeWhereLike($query, $column, $value)
{
    return $query->where($column, 'like', '%'.$value.'%');
}

public function scopeOrWhereLike($query, $column, $value)
{
    return $query->orWhere($column, 'like', '%'.$value.'%');
}

Usage:

$result = BookingDates::whereLike('email', $email)->orWhereLike('name', $name)->get();

How to force R to use a specified factor level as reference in a regression?

The relevel() command is a shorthand method to your question. What it does is reorder the factor so that whatever is the ref level is first. Therefore, reordering your factor levels will also have the same effect but gives you more control. Perhaps you wanted to have levels 3,4,0,1,2. In that case...

bFactor <- factor(b, levels = c(3,4,0,1,2))

I prefer this method because it's easier for me to see in my code not only what the reference was but the position of the other values as well (rather than having to look at the results for that).

NOTE: DO NOT make it an ordered factor. A factor with a specified order and an ordered factor are not the same thing. lm() may start to think you want polynomial contrasts if you do that.

Get a list of dates between two dates using a function

DECLARE @StartDate DATE = '2017-09-13',         @EndDate DATE = '2017-09-16'

SELECT date  FROM (   SELECT DATE = DATEADD(DAY, rn - 1, @StartDate)   FROM    (
    SELECT TOP (DATEDIFF(DAY, @StartDate, DATEADD(DAY,1,@EndDate)))
      rn = ROW_NUMBER() OVER (ORDER BY s1.[object_id])
    FROM sys.all_objects AS s1
    CROSS JOIN sys.all_objects AS s2
    ORDER BY s1.[object_id]   ) AS x ) AS y

Result:

How to dismiss AlertDialog in android

Try this:

   AlertDialog.Builder builder = new AlertDialog.Builder(this);
   AlertDialog OptionDialog = builder.create();
  background.setOnClickListener(new OnClickListener() {
        public void onClick(View v) {
            SetBackground();
       OptionDialog .dismiss();
        }
    });

Combine multiple results in a subquery into a single comma-separated value

Solution below:

SELECT GROUP_CONCAT(field_attr_best_weekday_value)as RAVI
FROM content_field_attr_best_weekday LEFT JOIN content_type_attraction
    on content_field_attr_best_weekday.nid = content_type_attraction.nid
GROUP BY content_field_attr_best_weekday.nid

Use this, you also can change the Joins

A connection was successfully established with the server, but then an error occurred during the pre-login handshake

In my case, i was getting the error when i wanted to access a remote database. However, i solved it by starting SQL Server Browser service.

How to URL encode in Python 3?

For Python 3 you could try using quote instead of quote_plus:

import urllib.parse

print(urllib.parse.quote("http://www.sample.com/"))

Result:

http%3A%2F%2Fwww.sample.com%2F

Or:

from requests.utils import requote_uri
requote_uri("http://www.sample.com/?id=123 abc")

Result:

'https://www.sample.com/?id=123%20abc'

update one table with data from another

Oracle 11g R2:

create table table1 (
  id number,
  name varchar2(10),
  desc_ varchar2(10)
);

create table table2 (
  id number,
  name varchar2(10),
  desc_ varchar2(10)
);

insert into table1 values(1, 'a', 'abc');
insert into table1 values(2, 'b', 'def');
insert into table1 values(3, 'c', 'ghi');

insert into table2 values(1, 'x', '123');
insert into table2 values(2, 'y', '456');

merge into table1 t1
using (select * from table2) t2
on (t1.id = t2.id)
when matched then update set t1.name = t2.name, t1.desc_ = t2.desc_;

select * from table1;

        ID NAME       DESC_
---------- ---------- ----------
         1 x          123
         2 y          456
         3 c          ghi

How to permanently export a variable in Linux?

If it suits anyone, here are some brief guidelines for adding environment variables permanently.

vi ~/.bash_profile

Add the variables to the file:

export DISPLAY=:0
export JAVA_HOME=~/opt/openjdk11

Immediately apply all changes:

source ~/.bash_profile

Source: https://www.serverlab.ca/tutorials/linux/administration-linux/how-to-set-environment-variables-in-linux/

How do include paths work in Visual Studio?

To use Windows SDK successfully you need not only make include files available to your projects but also library files and executables (tools). To set all these directories you should use WinSDK Configuration Tool.

HTML5 Canvas vs. SVG vs. div

For your purposes, I recommend using SVG, since you get DOM events, like mouse handling, including drag and drop, included, you don't have to implement your own redraw, and you don't have to keep track of the state of your objects. Use Canvas when you have to do bitmap image manipulation and use a regular div when you want to manipulate stuff created in HTML. As to performance, you'll find that modern browsers are now accelerating all three, but that canvas has received the most attention so far. On the other hand, how well you write your javascript is critical to getting the most performance with canvas, so I'd still recommend using SVG.

Java: set timeout on a certain block of code?

I faced a similar kind of issue where my task was to push a message to SQS within a particular timeout. I used the trivial logic of executing it via another thread and waiting on its future object by specifying the timeout. This would give me a TIMEOUT exception in case of timeouts.

final Future<ISendMessageResult> future = 
timeoutHelperThreadPool.getExecutor().submit(() -> {
  return getQueueStore().sendMessage(request).get();
});
try {
  sendMessageResult = future.get(200, TimeUnit.MILLISECONDS);
  logger.info("SQS_PUSH_SUCCESSFUL");
  return true;

} catch (final TimeoutException e) {
  logger.error("SQS_PUSH_TIMEOUT_EXCEPTION");
}

But there are cases where you can't stop the code being executed by another thread and you get true negatives in that case.

For example - In my case, my request reached SQS and while the message was being pushed, my code logic encountered the specified timeout. Now in reality my message was pushed into the Queue but my main thread assumed it to be failed because of the TIMEOUT exception. This is a type of problem which can be avoided rather than being solved. Like in my case I avoided it by providing a timeout which would suffice in nearly all of the cases.

If the code you want to interrupt is within you application and is not something like an API call then you can simply use

future.cancel(true)

However do remember that java docs says that it does guarantee that the execution will be blocked.

"Attempts to cancel execution of this task. This attempt will fail if the task has already completed, has already been cancelled,or could not be cancelled for some other reason. If successful,and this task has not started when cancel is called,this task should never run. If the task has already started,then the mayInterruptIfRunning parameter determines whether the thread executing this task should be interrupted inan attempt to stop the task."

What .NET collection provides the fastest search

You should read this blog that speed tested several different types of collections and methods for each using both single and multi-threaded techniques.

According to the results, a BinarySearch on a List and SortedList were the top performers constantly running neck-in-neck when looking up something as a "value".

When using a collection that allows for "keys", the Dictionary, ConcurrentDictionary, Hashset, and HashTables performed the best overall.

How do I connect to a MySQL Database in Python?

Even though some of you may mark this as a duplicate and get upset that I am copying someone else's answer, I would REALLY like to highlight an aspect of Mr. Napik's response. Because I missed this, I caused nationwide website downtime (9min). If only someone shared this information, I could have prevented it!

Here is his code:

import mysql.connector    
cnx = mysql.connector.connect(user='scott', password='tiger',
                              host='127.0.0.1',
                              database='employees')
try:
   cursor = cnx.cursor()
   cursor.execute("""select 3 from your_table""")
   result = cursor.fetchall()
   print(result)
finally:
    cnx.close()

The important thing here is the Try and Finally clause. This allows connections to ALWAYS be closed, regardless of what happens in the cursor/sqlstatement portion of the code. A lot of active connections cause DBLoadNoCPU to spike and could crash a db server.

I hope this warning helps to save servers and ultimately jobs! :D

HTML input field hint

You'd need attach an onFocus event to the input field via Javascript:

<input type="text" onfocus="this.value=''" value="..." ... />

Deploying just HTML, CSS webpage to Tomcat

There is no real need to create a war to run it from Tomcat. You can follow these steps

Create a folder in webapps folder e.g. MyApp
Put your html and css in that folder and name the html file, which you want to be the starting page for your application, index.html
Start tomcat and point your browser to url "http://localhost:8080/MyApp". Your index.html page will pop up in the browser

How can I determine the sector size in windows?

how to remove the bold from a headline?

You want font-weight, not text-decoration (along with suitable additional markup, such as <em> or <span>, so you can apply different styling to different parts of the heading)

What is a good regular expression to match a URL?

Regex if you want to ensure URL starts with HTTP/HTTPS:

https?:\/\/(www\.)?[-a-zA-Z0-9@:%._\+~#=]{1,256}\.[a-zA-Z0-9()]{1,6}\b([-a-zA-Z0-9()@:%_\+.~#?&//=]*)

If you do not require HTTP protocol:

[-a-zA-Z0-9@:%._\+~#=]{1,256}\.[a-zA-Z0-9()]{1,6}\b([-a-zA-Z0-9()@:%_\+.~#?&//=]*)

To try this out see http://regexr.com?37i6s, or for a version which is less restrictive http://regexr.com/3e6m0.

Example JavaScript implementation:

_x000D_

var expression = /[-a-zA-Z0-9@:%._\+~#=]{1,256}\.[a-zA-Z0-9()]{1,6}\b([-a-zA-Z0-9()@:%_\+.~#?&//=]*)?/gi;_x000D_
var regex = new RegExp(expression);_x000D_
var t = 'www.google.com';_x000D_
_x000D_
if (t.match(regex)) {_x000D_
  alert("Successful match");_x000D_
} else {_x000D_
  alert("No match");_x000D_
}

_x000D_

How to speed up insertion performance in PostgreSQL

If you happend to insert colums with UUIDs (which is not exactly your case) and to add to @Dennis answer (I can't comment yet), be advise than using gen_random_uuid() (requires PG 9.4 and pgcrypto module) is (a lot) faster than uuid_generate_v4()

=# explain analyze select uuid_generate_v4(),* from generate_series(1,10000);
                                                        QUERY PLAN
---------------------------------------------------------------------------------------------------------------------------
 Function Scan on generate_series  (cost=0.00..12.50 rows=1000 width=4) (actual time=11.674..10304.959 rows=10000 loops=1)
 Planning time: 0.157 ms
 Execution time: 13353.098 ms
(3 filas)


=# explain analyze select gen_random_uuid(),* from generate_series(1,10000);
                                                        QUERY PLAN
--------------------------------------------------------------------------------------------------------------------------
 Function Scan on generate_series  (cost=0.00..12.50 rows=1000 width=4) (actual time=252.274..418.137 rows=10000 loops=1)
 Planning time: 0.064 ms
 Execution time: 503.818 ms
(3 filas)

Also, it's the suggested official way to do it

Note

If you only need randomly-generated (version 4) UUIDs, consider using the gen_random_uuid() function from the pgcrypto module instead.

This droped insert time from ~2 hours to ~10 minutes for 3.7M of rows.

How can I connect to a Tor hidden service using cURL in PHP?

I use Privoxy and cURL to scrape Tor pages:

<?php
    $ch = curl_init('http://jhiwjjlqpyawmpjx.onion'); // Tormail URL
    curl_setopt($ch, CURLOPT_HEADER, 1);
    curl_setopt($ch, CURLOPT_HTTPPROXYTUNNEL, 1);
    curl_setopt($ch, CURLOPT_PROXY, "localhost:8118"); // Default privoxy port
    curl_setopt($ch, CURLOPT_PROXYTYPE, CURLPROXY_HTTP);
    curl_exec($ch);
    curl_close($ch);
?>

After installing Privoxy you need to add this line to the configuration file (/etc/privoxy/config). Note the space and '.' a the end of line.

forward-socks4a / localhost:9050 .

Then restart Privoxy.

/etc/init.d/privoxy restart

How to compile Go program consisting of multiple files?

It depends on your project structure. But most straightforward is:

go build -o ./myproject ./...

then run ./myproject.

Suppose your project structure looks like this

- hello
|- main.go

then you just go to the project directory and run

go build -o ./myproject

then run ./myproject on shell.

# most easiest; builds and run simultaneously
go run main.go

suppose your main file is nested into a sub-directory like a cmd

- hello
|- cmd
 |- main.go

then you will run

go run cmd/main.go

JSON and XML comparison

The important thing about JSON is to keep data transfer encrypted for security reasons. No doubt that JSON is much much faster then XML. I have seen XML take 100ms where as JSON only took 60ms. JSON data is easy to manipulate.

java.lang.NoClassDefFoundError: org/apache/http/client/HttpClient

I solved this issue for myself, I found there's was two files of http-client with different version of other dependent jar files. So there may version were collapsing between libraries files so remove all old/previous libraries files and re-add are jar files from lib folder of this zip file:

Donwload Zip file from here

How do I edit a file after I shell to a Docker container?

You can also use a special container which will contain only the command you need: Vim. I chose python-vim. It assumes that the data you want to edit are in a data container built with the following Dockerfile:

FROM debian:jessie
ENV MY_USER_PASS my_user_pass
RUN groupadd --gid 1001 my_user
RUN useradd -ms /bin/bash --home /home/my_user \
            -p $(echo "print crypt("${MY_USER_PASS:-password}", "salt")" | perl) \
            --uid 1001 --gid 1001 my_user
ADD src /home/my_user/src
RUN chown -R my_user:my_user /home/my_user/src
RUN chmod u+x /home/my_user/src
CMD ["true"]

You will be able to edit your data by mounting a Docker volume (src_volume) which will be shared by your data container (src_data) and the python-vim container.

docker volume create --name src_volume
docker build -t src_data .
docker run -d -v src_volume:/home/my_user/src --name src_data_1 src_data
docker run --rm -it -v src_volume:/src fedeg/python-vim:latest

That way, you do not change your containers. You just use a special container for this work.

C# elegant way to check if a property's property is null

Just stumbled accross this post.

Some time ago I made a suggestion on Visual Studio Connect about adding a new ??? operator.

http://visualstudio.uservoice.com/forums/121579-visual-studio/suggestions/4104392-add-as-an-recursive-null-reference-check-opera

This would require some work from the framework team but don't need to alter the language but just do some compiler magic. The idea was that the compiler should change this code (syntax not allowed atm)

string product_name = Order.OrderDetails[0].Product.Name ??? "no product defined";

into this code

Func<string> _get_default = () => "no product defined"; 
string product_name = Order == null 
    ? _get_default.Invoke() 
    : Order.OrderDetails[0] == null 
        ? _get_default.Invoke() 
        : Order.OrderDetails[0].Product == null 
            ? _get_default.Invoke() 
            : Order.OrderDetails[0].Product.Name ?? _get_default.Invoke()

For null check this could look like

bool isNull = (Order.OrderDetails[0].Product ??? null) == null;

How to disable registration new users in Laravel

This might be new in 5.7, but there is now an options array to the auth method. Simply changing

Auth::routes();

Auth::routes(['register' => false]);

in your routes file after running php artisan make:auth will disable user registration.

What is %2C in a URL?

Another technique that you can use to get the symbol from url gibberish is to open Chrome console with F12 and just paste following javascript:

decodeURIComponent("%2c")

it will decode and return the symbol (or symbols).

Hope this saves you some time.

Scrollview can host only one direct child

Wrap all the children inside of another LinearLayout with wrap_content for both the width and the height as well as the vertical orientation.

Full examples of using pySerial package

I have not used pyserial but based on the API documentation at https://pyserial.readthedocs.io/en/latest/shortintro.html it seems like a very nice interface. It might be worth double-checking the specification for AT commands of the device/radio/whatever you are dealing with.

Specifically, some require some period of silence before and/or after the AT command for it to enter into command mode. I have encountered some which do not like reads of the response without some delay first.

How do I get TimeSpan in minutes given two Dates?

double totalMinutes = (end-start).TotalMinutes;

Margin between items in recycler view Android

Try to add RecyclerView.ItemDecoration

To know how to do that: How to add dividers and spaces between items in RecyclerView?

Conflict with dependency 'com.android.support:support-annotations'. Resolved versions for app (23.1.0) and test app (23.0.1) differ

In my case, I added below code in dependencies of app level build.gradle

androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
    exclude group: 'com.android.support', module: 'support-annotations'
})

After that, I clean the project and rebuild.My problem solved.

Simple conversion between java.util.Date and XMLGregorianCalendar

You can use the this customization to change the default mapping to java.util.Date

<xsd:annotation>
<xsd:appinfo>
    <jaxb:globalBindings>
        <jaxb:javaType name="java.util.Date" xmlType="xsd:dateTime"
                 parseMethod="org.apache.cxf.xjc.runtime.DataTypeAdapter.parseDateTime"
                 printMethod="org.apache.cxf.xjc.runtime.DataTypeAdapter.printDateTime"/>
    </jaxb:globalBindings>
</xsd:appinfo>

Cannot find pkg-config error

for me, (OSX) the problem was solved doing this:

brew install pkg-config

dismissModalViewControllerAnimated deprecated

Now in iOS 6 and above, you can use:

[[Picker presentingViewController] dismissViewControllerAnimated:YES completion:nil];

Instead of:

[[Picker parentViewControl] dismissModalViewControllerAnimated:YES];

...And you can use:

[self presentViewController:picker animated:YES completion:nil];

Instead of

[self presentModalViewController:picker animated:YES];

Maintain the aspect ratio of a div with CSS

If you want to fit a square inside the viewport on either portrait or landscape view (as big as possible, but nothing sticking outside), switch between using vw/vh on orientation portrait/landscape:

@media (orientation:portrait ) {
  .square {
    width :100vw;
    height:100vw;
  }
} 
@media (orientation:landscape) {
  .square {
    width :100vh;
    height:100vh;
  }
}

android on Text Change Listener

A bit late of a answer, but here is a reusable solution:

/**
 * An extension of TextWatcher which stops further callbacks being called as 
 * a result of a change happening within the callbacks themselves.
 */
public abstract class EditableTextWatcher implements TextWatcher {

    private boolean editing;

    @Override
    public final void beforeTextChanged(CharSequence s, int start, 
                                                    int count, int after) {
        if (editing)
            return;

        editing = true;
        try {
            beforeTextChange(s, start, count, after);
        } finally {
            editing = false;
        }
    }

    protected abstract void beforeTextChange(CharSequence s, int start, 
                                                     int count, int after);

    @Override
    public final void onTextChanged(CharSequence s, int start, 
                                                int before, int count) {
        if (editing)
            return;

        editing = true;
        try {
            onTextChange(s, start, before, count);
        } finally {
            editing = false;
        }
    }

    protected abstract void onTextChange(CharSequence s, int start, 
                                            int before, int count);

    @Override
    public final void afterTextChanged(Editable s) {
        if (editing)
            return;

        editing = true;
        try {
            afterTextChange(s);
        } finally {
            editing = false;
        }
    }

    public boolean isEditing() {
        return editing;
    }

    protected abstract void afterTextChange(Editable s);
}

So when the above is used, any setText() calls happening within the TextWatcher will not result in the TextWatcher being called again:

/**
 * A setText() call in any of the callbacks below will not result in TextWatcher being 
 * called again.
 */
public class MyTextWatcher extends EditableTextWatcher {

    @Override
    protected void beforeTextChange(CharSequence s, int start, int count, int after) {
    }

    @Override
    protected void onTextChange(CharSequence s, int start, int before, int count) {
    }

    @Override
    protected void afterTextChange(Editable s) {
    }
}

What is SELF JOIN and when would you use it?

Well, one classic example is where you wanted to get a list of employees and their immediate managers:

select e.employee as employee, b.employee as boss
from emptable e, emptable b
where e.manager_id = b.empolyee_id
order by 1

It's basically used where there is any relationship between rows stored in the same table.

employees.
multi-level marketing.
machine parts.

And so on...

Static array vs. dynamic array in C++

static arrary meens with giving on elements in side the array

dynamic arrary meens without giving on elements in side the array

example:

     char a[10]; //static array
       char a[];  //dynamic array

Change directory in Node.js command prompt

Type .exit in command prompt window, It terminates the node repl.

Showing ValueError: shapes (1,3) and (1,3) not aligned: 3 (dim 1) != 1 (dim 0)

The column of the first matrix and the row of the second matrix should be equal and the order should be like this only

column of first matrix = row of second matrix

and do not follow the below step

row of first matrix  = column of second matrix

it will throw an error

Is there a way to only install the mysql client (Linux)?

sudo apt-get install mysql-client-core-5.5

HTTP Error 403.14 - Forbidden - The Web server is configured to not list the contents of this directory

Empty website template creates an ASP.NET website that includes a Web.config file but no other files. Means you have not any default page to show on browse or run.

This error message simply means that you did not setup and configure the default document properly on your IIS.

Once this is configured, the error message will go away.

How do I do a not equal in Django queryset filtering?

Watch out for lots of incorrect answers to this question!

Gerard's logic is correct, though it will return a list rather than a queryset (which might not matter).

If you need a queryset, use Q:

from django.db.models import Q
results = Model.objects.filter(Q(a=false) | Q(x=5))

Maven Unable to locate the Javac Compiler in:

For Intellij Idea set everything appropriately (similarly to this):

JAVA_HOME = C:\Program Files\Java\jdk1.8.0_60
JRE_HOME = JAVA_HOME\jre

and dont forget to restart Idea. This program picks up variables at start so any changes to environtment variables while the program is running will not have any effect.

How to send HTML email using linux command line

With heirloom-mailx you can change sendmail program to your hook script, replace headers there and then use sendmail.

The script I use (~/bin/sendmail-hook):

#!/bin/bash

sed '1,/^$/{
s,^\(Content-Type: \).*$,\1text/html; charset=utf-8,g
s,^\(Content-Transfer-Encoding: \).*$,\18bit,g
}' | sendmail $@

This script changes the values in the mail header as follows:

Content-Type: to text/html; charset=utf-8
Content-Transfer-Encoding: to 8bit (not sure if this is really needed).

To send HTML email:

mail -Ssendmail='~/bin/sendmail-hook' \
    -s "Built notification" [email protected] < /var/www/report.csv

Is it possible to use global variables in Rust?

You can use static variables fairly easily as long as they are thread-local.

The downside is that the object will not be visible to other threads your program might spawn. The upside is that unlike truly global state, it is entirely safe and is not a pain to use - true global state is a massive pain in any language. Here's an example:

extern mod sqlite;

use std::cell::RefCell;

thread_local!(static ODB: RefCell<sqlite::database::Database> = RefCell::new(sqlite::open("test.db"));

fn main() {
    ODB.with(|odb_cell| {
        let odb = odb_cell.borrow_mut();
        // code that uses odb goes here
    });
}

Here we create a thread-local static variable and then use it in a function. Note that it is static and immutable; this means that the address at which it resides is immutable, but thanks to RefCell the value itself will be mutable.

Unlike regular static, in thread-local!(static ...) you can create pretty much arbitrary objects, including those that require heap allocations for initialization such as Vec, HashMap and others.

If you cannot initialize the value right away, e.g. it depends on user input, you may also have to throw Option in there, in which case accessing it gets a bit unwieldy:

extern mod sqlite;

use std::cell::RefCell;

thread_local!(static ODB: RefCell<Option<sqlite::database::Database>> = RefCell::New(None));

fn main() {
    ODB.with(|odb_cell| {
        // assumes the value has already been initialized, panics otherwise
        let odb = odb_cell.borrow_mut().as_mut().unwrap();
        // code that uses odb goes here
    });
}

What does Html.HiddenFor do?

It creates a hidden input on the form for the field (from your model) that you pass it.

It is useful for fields in your Model/ViewModel that you need to persist on the page and have passed back when another call is made but shouldn't be seen by the user.

Consider the following ViewModel class:

public class ViewModel
{
    public string Value { get; set; }
    public int Id { get; set; }
}

Now you want the edit page to store the ID but have it not be seen:

<% using(Html.BeginForm() { %>
    <%= Html.HiddenFor(model.Id) %><br />
    <%= Html.TextBoxFor(model.Value) %>
<% } %>

This results in the equivalent of the following HTML:

<form name="form1">
    <input type="hidden" name="Id">2</input>
    <input type="text" name="Value" value="Some Text" />
</form>

How to break lines in PowerShell?

If you are using just code like this below, you must put just a grave accent at the end of line `.

docker run -d --name rabbitmq `
           -p 5672:5672 `
           -p 15672:15672 `
           --restart=always `
           --hostname rabbitmq-master `
           -v c:\docker\rabbitmq\data:/var/lib/rabbitmq `
           rabbitmq:latest

Using onBlur with JSX and React

There are a few problems here.

1: onBlur expects a callback, and you are calling renderPasswordConfirmError and using the return value, which is null.

2: you need a place to render the error.

3: you need a flag to track "and I validating", which you would set to true on blur. You can set this to false on focus if you want, depending on your desired behavior.

handleBlur: function () {
  this.setState({validating: true});
},
render: function () {
  return <div>
    ...
    <input
        type="password"
        placeholder="Password (confirm)"
        valueLink={this.linkState('password2')}
        onBlur={this.handleBlur}
     />
    ...
    {this.renderPasswordConfirmError()}
  </div>
},
renderPasswordConfirmError: function() {
  if (this.state.validating && this.state.password !== this.state.password2) {
    return (
      <div>
        <label className="error">Please enter the same password again.</label>
      </div>
    );
  }  
  return null;
},

How do I enumerate through a JObject?

The answer did not work for me. I dont know how it got so many votes. Though it helped in pointing me in a direction.

This is the answer that worked for me:

foreach (var x in jobj)
{
    var key = ((JProperty) (x)).Name;
    var jvalue = ((JProperty)(x)).Value ;
}

Java: How can I compile an entire directory structure of code ?

With Bash 4+, you can just enable globstar

shopt -s globstar

and then do

javac **/*.java

How to rotate a div using jQuery

EDIT: Updated for jQuery 1.8

Since jQuery 1.8 browser specific transformations will be added automatically. jsFiddle Demo

var rotation = 0;

jQuery.fn.rotate = function(degrees) {
    $(this).css({'transform' : 'rotate('+ degrees +'deg)'});
    return $(this);
};

$('.rotate').click(function() {
    rotation += 5;
    $(this).rotate(rotation);
});

EDIT: Added code to make it a jQuery function.

For those of you who don't want to read any further, here you go. For more details and examples, read on. jsFiddle Demo.

var rotation = 0;

jQuery.fn.rotate = function(degrees) {
    $(this).css({'-webkit-transform' : 'rotate('+ degrees +'deg)',
                 '-moz-transform' : 'rotate('+ degrees +'deg)',
                 '-ms-transform' : 'rotate('+ degrees +'deg)',
                 'transform' : 'rotate('+ degrees +'deg)'});
    return $(this);
};

$('.rotate').click(function() {
    rotation += 5;
    $(this).rotate(rotation);
});

EDIT: One of the comments on this post mentioned jQuery Multirotation. This plugin for jQuery essentially performs the above function with support for IE8. It may be worth using if you want maximum compatibility or more options. But for minimal overhead, I suggest the above function. It will work IE9+, Chrome, Firefox, Opera, and many others.

Bobby... This is for the people who actually want to do it in the javascript. This may be required for rotating on a javascript callback.

Here is a jsFiddle.

If you would like to rotate at custom intervals, you can use jQuery to manually set the css instead of adding a class. Like this! I have included both jQuery options at the bottom of the answer.

HTML

<div class="rotate">
    <h1>Rotatey text</h1>
</div>

CSS

/* Totally for style */
.rotate {
    background: #F02311;
    color: #FFF;
    width: 200px;
    height: 200px;
    text-align: center;
    font: normal 1em Arial;
    position: relative;
    top: 50px;
    left: 50px;
}

/* The real code */
.rotated {
    -webkit-transform: rotate(45deg);  /* Chrome, Safari 3.1+ */
    -moz-transform: rotate(45deg);  /* Firefox 3.5-15 */
    -ms-transform: rotate(45deg);  /* IE 9 */
    -o-transform: rotate(45deg);  /* Opera 10.50-12.00 */
    transform: rotate(45deg);  /* Firefox 16+, IE 10+, Opera 12.10+ */
}

jQuery

Make sure these are wrapped in $(document).ready

$('.rotate').click(function() {
    $(this).toggleClass('rotated');
});

Custom intervals

var rotation = 0;
$('.rotate').click(function() {
    rotation += 5;
    $(this).css({'-webkit-transform' : 'rotate('+ rotation +'deg)',
                 '-moz-transform' : 'rotate('+ rotation +'deg)',
                 '-ms-transform' : 'rotate('+ rotation +'deg)',
                 'transform' : 'rotate('+ rotation +'deg)'});
});

How can I make a thumbnail <img> show a full size image when clicked?

The

<a href="image2.gif" ><img src="image1.gif"/></a>

technique has always worked for me. I used it to good effect in my Super Bowl diary, but I see that the scripts I used are broken. Once I get them fixed I will edit in the URL.

Excel how to fill all selected blank cells with text

Here's a tricky way to do this - select the cells that you want to replace and in Excel 2010 select F5 to bring up the "goto" box. Hit the "special" button. Select "blanks" - this should select all the cells that are blank. Enter NULL or whatever you want in the formula box and hit ctrl + enter to apply to all selected cells. Easy!

Accessing @attribute from SimpleXML

You can just do:

echo $xml['token'];

How to sort an array of integers correctly

By default, the sort method sorts elements alphabetically. To sort numerically just add a new method which handles numeric sorts (sortNumber, shown below) -

_x000D_

var numArray = [140000, 104, 99];_x000D_
numArray.sort(function(a, b) {_x000D_
  return a - b;_x000D_
});_x000D_
_x000D_
console.log(numArray);

_x000D_

In ES6, you can simplify this with arrow functions:

numArray.sort((a, b) => a - b); // For ascending sort
numArray.sort((a, b) => b - a); // For descending sort

Documentation:

Mozilla Array.prototype.sort() recommends this compare function for arrays that don't contain Infinity or NaN. (Because Inf - Inf is NaN, not 0).

Also examples of sorting objects by key.

Android: How can I validate EditText input?

I have created this library for android where you can validate a material design EditText inside and EditTextLayout easily like this:

    compile 'com.github.TeleClinic:SmartEditText:0.1.0'

then you can use it like this:

<com.teleclinic.kabdo.smartmaterialedittext.CustomViews.SmartEditText
    android:id="@+id/passwordSmartEditText"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    app:setLabel="Password"
    app:setMandatoryErrorMsg="Mandatory field"
    app:setPasswordField="true"
    app:setRegexErrorMsg="Weak password"
    app:setRegexType="MEDIUM_PASSWORD_VALIDATION" />

<com.teleclinic.kabdo.smartmaterialedittext.CustomViews.SmartEditText
    android:id="@+id/ageSmartEditText"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    app:setLabel="Age"
    app:setMandatoryErrorMsg="Mandatory field"
    app:setRegexErrorMsg="Is that really your age :D?"
    app:setRegexString=".*\\d.*" />

Then you can check if it is valid like this:

    ageSmartEditText.check()

For more examples and customization check the repository https://github.com/TeleClinic/SmartEditText

Has Facebook sharer.php changed to no longer accept detailed parameters?

I review your url in use:

https://www.facebook.com/sharer/sharer.php?s=100&p[title]=EXAMPLE&p[summary]=EXAMPLE&p[url]=EXAMPLE&p[images][0]=EXAMPLE

and see this differences:

The sharer URL not is same.
The strings are in different order. ( Do not know if this affects ).

I use this URL string:

http://www.facebook.com/sharer.php?s=100&p[url]=http://www.example.com/&p[images][0]=/images/image.jpg&p[title]=Title&p[summary]=Summary

In the "title" and "summary" section, I use the php function urlencode(); like this:

<?php echo urlencode($detail->title); ?>

And working fine for me.

How do you declare an object array in Java?

Like this

Vehicle[] car = new Vehicle[10];

Mocking static methods with Mockito

To mock static method you should use a Powermock look at: https://github.com/powermock/powermock/wiki/MockStatic. Mockito doesn't provide this functionality.

You can read nice a article about mockito: http://refcardz.dzone.com/refcardz/mockito

Insert line break in wrapped cell via code

Just do Ctrl + Enter inside the text box

How to ftp with a batch file?

If you need to pass variables to the txt file you can create in on the fly and remove after.

This is example is a batch script running as administrator. It creates a zip file using some date & time variables. Then it creates a ftp text file on the fly with some variables. Then it deletes the zip, folder and ftp text file.

set YYYY=%DATE:~10,4%
set MM=%DATE:~4,2%
set DD=%DATE:~7,2%

set HH=%TIME: =0%
set HH=%HH:~0,2%
set MI=%TIME:~3,2%
set SS=%TIME:~6,2%
set FF=%TIME:~9,2%

set dirName=%YYYY%%MM%%DD%
set fileName=%YYYY%%MM%%DD%_%HH%%MI%%SS%.zip

echo %fileName%

"C:\Program Files\7-Zip\7z.exe" a -tzip C:\%dirName%\%fileName% -r "C:\tozip\*.*" -mx5

(
    echo open 198.123.456.789
    echo [email protected]
    echo yourpassword
    echo lcd "C:/%dirName%"
    echo cd  theremotedir
    echo binary
    echo mput *.zip
    echo disconnect
    echo bye
) > C:\ftp.details.txt


cd C:\
FTP -v -i -s:"ftp.details.txt"

del C:\ftp.details.txt /f

How do I remove the height style from a DIV using jQuery?

To reset the height of the div, just try

$("#someDiv").height('auto');

How to create a new figure in MATLAB?

The other thing to be careful about, is to use the clf (clear figure) command when you are starting a fresh plot. Otherwise you may be plotting on a pre-existing figure (not possible with the figure command by itself, but if you do figure(2) there may already be a figure #2), with more than one axis, or an axis that is placed kinda funny. Use clf to ensure that you're starting from scratch:

figure(N);
clf;
plot(something);
...

How to get the filename without the extension in Java?

public static String getFileExtension(String fileName) {
        if (TextUtils.isEmpty(fileName) || !fileName.contains(".") || fileName.endsWith(".")) return null;
        return fileName.substring(fileName.lastIndexOf(".") + 1);
    }

    public static String getBaseFileName(String fileName) {
        if (TextUtils.isEmpty(fileName) || !fileName.contains(".") || fileName.endsWith(".")) return null;
        return fileName.substring(0,fileName.lastIndexOf("."));
    }

How to return a class object by reference in C++?

I will show you some examples:

First example, do not return local scope object, for example:

const string &dontDoThis(const string &s)
{
    string local = s;
    return local;
}

You can't return local by reference, because local is destroyed at the end of the body of dontDoThis.

Second example, you can return by reference:

const string &shorterString(const string &s1, const string &s2)
{
    return (s1.size() < s2.size()) ? s1 : s2;
}

Here, you can return by reference both s1 and s2 because they were defined before shorterString was called.

Third example:

char &get_val(string &str, string::size_type ix)
{
    return str[ix];
}

usage code as below:

string s("123456");
cout << s << endl;
char &ch = get_val(s, 0); 
ch = 'A';
cout << s << endl; // A23456

get_val can return elements of s by reference because s still exists after the call.

Fourth example

class Student
{
public:
    string m_name;
    int age;    

    string &getName();
};

string &Student::getName()
{
    // you can return by reference
    return m_name;
}

string& Test(Student &student)
{
    // we can return `m_name` by reference here because `student` still exists after the call
    return stu.m_name;
}

usage example:

Student student;
student.m_name = 'jack';
string name = student.getName();
// or
string name2 = Test(student);

Fifth example:

class String
{
private:
    char *str_;

public:
    String &operator=(const String &str);
};

String &String::operator=(const String &str)
{
    if (this == &str)
    {
        return *this;
    }
    delete [] str_;
    int length = strlen(str.str_);
    str_ = new char[length + 1];
    strcpy(str_, str.str_);
    return *this;
}

You could then use the operator= above like this:

String a;
String b;
String c = b = a;

data.map is not a function

The right way to iterate over objects is

Object.keys(someObject).map(function(item)...
Object.keys(someObject).forEach(function(item)...;

// ES way
Object.keys(data).map(item => {...});
Object.keys(data).forEach(item => {...});

Read here for details

Remove .php extension with .htaccess

If your url in PHP like http://yourdomain.com/demo.php than comes like http://yourdomain.com/demo

This is all you need:

create file .htaccess

RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
#RewriteRule ^([^\.]+)$ $1.html [NC,L]
RewriteRule ^([^\.]+)$ $1.php [NC,L]

Highlight Anchor Links when user manually scrolls?

You can use Jquery's on method and listen for the scroll event.

Hiding axis text in matplotlib plots

I've colour coded this figure to ease the process.

import matplotlib.pyplot as plt
fig = plt.figure()
ax = fig.add_subplot(111)

You can have full control over the figure using these commands, to complete the answer I've add also the control over the splines:

ax.spines['top'].set_visible(False)
ax.spines['right'].set_visible(False)

# X AXIS -BORDER
ax.spines['bottom'].set_visible(False)
# BLUE
ax.set_xticklabels([])
# RED
ax.set_xticks([])
# RED AND BLUE TOGETHER
ax.axes.get_xaxis().set_visible(False)

# Y AXIS -BORDER
ax.spines['left'].set_visible(False)
# YELLOW
ax.set_yticklabels([])
# GREEN
ax.set_yticks([])
# YELLOW AND GREEN TOGHETHER
ax.axes.get_yaxis().set_visible(False)

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

I just thought that I would add my own, one-liner (even though there are many other useful answers already).

string ipAddress = new WebClient().DownloadString("http://icanhazip.com");

Java get String CompareTo as a comparator object

We can use the String.CASE_INSENSITIVE_ORDER comparator to compare the strings in case insensitive order.

Arrays.binarySearch(someStringArray, "The String to find.",String.CASE_INSENSITIVE_ORDER);

Private properties in JavaScript ES6 classes

class Something {
  constructor(){
    var _property = "test";
    Object.defineProperty(this, "property", {
        get: function(){ return _property}
    });
  }
}

var instance = new Something();
console.log(instance.property); //=> "test"
instance.property = "can read from outside, but can't write";
console.log(instance.property); //=> "test"

Why use a ReentrantLock if one can use synchronized(this)?

From oracle documentation page about ReentrantLock:

A reentrant mutual exclusion Lock with the same basic behaviour and semantics as the implicit monitor lock accessed using synchronized methods and statements, but with extended capabilities.

A ReentrantLock is owned by the thread last successfully locking, but not yet unlocking it. A thread invoking lock will return, successfully acquiring the lock, when the lock is not owned by another thread. The method will return immediately if the current thread already owns the lock.
The constructor for this class accepts an optional fairness parameter. When set true, under contention, locks favor granting access to the longest-waiting thread. Otherwise this lock does not guarantee any particular access order.

ReentrantLock key features as per this article

Ability to lock interruptibly.
Ability to timeout while waiting for lock.
Power to create fair lock.
API to get list of waiting thread for lock.
Flexibility to try for lock without blocking.

You can use ReentrantReadWriteLock.ReadLock, ReentrantReadWriteLock.WriteLock to further acquire control on granular locking on read and write operations.

Have a look at this article by Benjamen on usage of different type of ReentrantLocks

Gradle store on local file system

Many answers are correct! I want to add that you can easily find your download location with

gradle --info build

like described in https://stackoverflow.com/a/54000767/4471199.

New downloaded artifacts will be shown in stdout:

Downloading https://plugins.gradle.org/m2/org/springframework/boot/spring-boot-parent/2.1.7.RELEASE/spring-boot-parent-2.1.7.RELEASE.pom to /tmp/gradle_download551283009937119777bin

In this case, I used the docker image gradle:5.6.2-jdk12. As you can see, the docker container uses /tmp as download location.

Get UIScrollView to scroll to the top

Retrieve specific commit from a remote Git repository

I think 'git ls-remote' ( http://git-scm.com/docs/git-ls-remote ) should do what you want. Without force fetch or pull.

Update value of a nested dictionary of varying depth

I recommend to replace {} by type(v)() in order to propagate object type of any dict subclass stored in u but absent from d. For example, this would preserve types such as collections.OrderedDict:

Python 2:

import collections

def update(d, u):
    for k, v in u.iteritems():
        if isinstance(v, collections.Mapping):
            d[k] = update(d.get(k, type(v)()), v)
        else:
            d[k] = v
    return d

Python 3:

import collections.abc

def update(d, u):
    for k, v in u.items():
        if isinstance(v, collections.abc.Mapping):
            d[k] = update(d.get(k, type(v)()), v)
        else:
            d[k] = v
    return d

Creating a select box with a search option

Full option searchable select box

This also supports Control buttons keyboards such as ArrowDown ArrowUp and Enter keys

_x000D_

function filterFunction(that, event) {_x000D_
    let container, input, filter, li, input_val;_x000D_
    container = $(that).closest(".searchable");_x000D_
    input_val = container.find("input").val().toUpperCase();_x000D_
_x000D_
    if (["ArrowDown", "ArrowUp", "Enter"].indexOf(event.key) != -1) {_x000D_
        keyControl(event, container)_x000D_
    } else {_x000D_
        li = container.find("ul li");_x000D_
        li.each(function (i, obj) {_x000D_
            if ($(this).text().toUpperCase().indexOf(input_val) > -1) {_x000D_
                $(this).show();_x000D_
            } else {_x000D_
                $(this).hide();_x000D_
            }_x000D_
        });_x000D_
_x000D_
        container.find("ul li").removeClass("selected");_x000D_
        setTimeout(function () {_x000D_
            container.find("ul li:visible").first().addClass("selected");_x000D_
        }, 100)_x000D_
    }_x000D_
}_x000D_
_x000D_
function keyControl(e, container) {_x000D_
    if (e.key == "ArrowDown") {_x000D_
_x000D_
        if (container.find("ul li").hasClass("selected")) {_x000D_
            if (container.find("ul li:visible").index(container.find("ul li.selected")) + 1 < container.find("ul li:visible").length) {_x000D_
                container.find("ul li.selected").removeClass("selected").nextAll().not('[style*="display: none"]').first().addClass("selected");_x000D_
            }_x000D_
_x000D_
        } else {_x000D_
            container.find("ul li:first-child").addClass("selected");_x000D_
        }_x000D_
_x000D_
    } else if (e.key == "ArrowUp") {_x000D_
_x000D_
        if (container.find("ul li:visible").index(container.find("ul li.selected")) > 0) {_x000D_
            container.find("ul li.selected").removeClass("selected").prevAll().not('[style*="display: none"]').first().addClass("selected");_x000D_
        }_x000D_
    } else if (e.key == "Enter") {_x000D_
        container.find("input").val(container.find("ul li.selected").text()).blur();_x000D_
        onSelect(container.find("ul li.selected").text())_x000D_
    }_x000D_
_x000D_
    container.find("ul li.selected")[0].scrollIntoView({_x000D_
        behavior: "smooth",_x000D_
    });_x000D_
}_x000D_
_x000D_
function onSelect(val) {_x000D_
    alert(val)_x000D_
}_x000D_
_x000D_
$(".searchable input").focus(function () {_x000D_
    $(this).closest(".searchable").find("ul").show();_x000D_
    $(this).closest(".searchable").find("ul li").show();_x000D_
});_x000D_
$(".searchable input").blur(function () {_x000D_
    let that = this;_x000D_
    setTimeout(function () {_x000D_
        $(that).closest(".searchable").find("ul").hide();_x000D_
    }, 300);_x000D_
});_x000D_
_x000D_
$(document).on('click', '.searchable ul li', function () {_x000D_
    $(this).closest(".searchable").find("input").val($(this).text()).blur();_x000D_
    onSelect($(this).text())_x000D_
});_x000D_
_x000D_
$(".searchable ul li").hover(function () {_x000D_
    $(this).closest(".searchable").find("ul li.selected").removeClass("selected");_x000D_
    $(this).addClass("selected");_x000D_
});

_x000D_

div.searchable {_x000D_
    width: 300px;_x000D_
    float: left;_x000D_
    margin: 0 15px;_x000D_
}_x000D_
_x000D_
.searchable input {_x000D_
    width: 100%;_x000D_
    height: 50px;_x000D_
    font-size: 18px;_x000D_
    padding: 10px;_x000D_
    -webkit-box-sizing: border-box; /* Safari/Chrome, other WebKit */_x000D_
    -moz-box-sizing: border-box; /* Firefox, other Gecko */_x000D_
    box-sizing: border-box; /* Opera/IE 8+ */_x000D_
    display: block;_x000D_
    font-weight: 400;_x000D_
    line-height: 1.6;_x000D_
    color: #495057;_x000D_
    background-color: #fff;_x000D_
    background-clip: padding-box;_x000D_
    border: 1px solid #ced4da;_x000D_
    border-radius: .25rem;_x000D_
    transition: border-color .15s ease-in-out, box-shadow .15s ease-in-out;_x000D_
    background: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 4 5'%3E%3Cpath fill='%23343a40' d='M2 0L0 2h4zm0 5L0 3h4z'/%3E%3C/svg%3E") no-repeat right .75rem center/8px 10px;_x000D_
}_x000D_
_x000D_
.searchable ul {_x000D_
    display: none;_x000D_
    list-style-type: none;_x000D_
    background-color: #fff;_x000D_
    border-radius: 0 0 5px 5px;_x000D_
    border: 1px solid #add8e6;_x000D_
    border-top: none;_x000D_
    max-height: 180px;_x000D_
    margin: 0;_x000D_
    overflow-y: scroll;_x000D_
    overflow-x: hidden;_x000D_
    padding: 0;_x000D_
}_x000D_
_x000D_
.searchable ul li {_x000D_
    padding: 7px 9px;_x000D_
    border-bottom: 1px solid #e1e1e1;_x000D_
    cursor: pointer;_x000D_
    color: #6e6e6e;_x000D_
}_x000D_
_x000D_
.searchable ul li.selected {_x000D_
    background-color: #e8e8e8;_x000D_
    color: #333;_x000D_
}

_x000D_

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>_x000D_
<div class="searchable">_x000D_
    <input type="text" placeholder="search countries" onkeyup="filterFunction(this,event)">_x000D_
    <ul>_x000D_
        <li>Algeria</li>_x000D_
        <li>Bulgaria</li>_x000D_
        <li>Canada</li>_x000D_
        <li>Egypt</li>_x000D_
        <li>Fiji</li>_x000D_
        <li>India</li>_x000D_
        <li>Japan</li>_x000D_
        <li>Iran (Islamic Republic of)</li>_x000D_
        <li>Lao People's Democratic Republic</li>_x000D_
        <li>Micronesia (Federated States of)</li>_x000D_
        <li>Nicaragua</li>_x000D_
        <li>Senegal</li>_x000D_
        <li>Tajikistan</li>_x000D_
        <li>Yemen</li>_x000D_
    </ul>_x000D_
</div>

_x000D_

Get Mouse Position

import java.awt.MouseInfo;
import java.util.concurrent.TimeUnit;

public class Cords {

    public static void main(String[] args) throws InterruptedException {

        //get cords of mouse code, outputs to console every 1/2 second
        //make sure to import and include the "throws in the main method"

        while(true == true)
        {
        TimeUnit.SECONDS.sleep(1/2);
        double mouseX = MouseInfo.getPointerInfo().getLocation().getX();
        double mouseY = MouseInfo.getPointerInfo().getLocation().getY();
        System.out.println("X:" + mouseX);
        System.out.println("Y:" + mouseY);
        //make sure to import 
        }

    }

}

Replacement for "rename" in dplyr

dplyr >= 1.0.0

In addition to dplyr::rename in newer versions of dplyr is rename_with()

rename_with() renames columns using a function.

You can apply a function over a tidy-select set of columns using the .cols argument:

iris %>% 
  dplyr::rename_with(.fn = ~ gsub("^S", "s", .), .cols = where(is.numeric))

    sepal.Length sepal.Width Petal.Length Petal.Width    Species
1            5.1         3.5          1.4         0.2     setosa
2            4.9         3.0          1.4         0.2     setosa
3            4.7         3.2          1.3         0.2     setosa
4            4.6         3.1          1.5         0.2     setosa
5            5.0         3.6          1.4         0.2     setosa

Get changes from master into branch in Git

Scenario :

I created a branch from master say branch-1 and pulled it to my local.
My Friend created a branch from master say branch-2.
He committed some code changes to master.
Now I want to take those changes from master branch to my local branch.

Solution

git stash // to save all existing changes in local branch
git checkout master // Switch to master branch from branch-1
git pull // take changes from the master
git checkout branch-1 // switchback to your own branch
git rebase master // merge all the changes and move you git head  forward
git stash apply // reapply all you saved changes

You can find conflicts on your file after executing "git stash apply". You need to fix it manually and now you are ready to push.

how to use python2.7 pip instead of default pip

as noted here, this is what worked best for me:

sudo apt-get install python3 python3-pip python3-setuptools

sudo update-alternatives --install /usr/bin/python python /usr/bin/python3 10

How can I declare a global variable in Angular 2 / Typescript?

I like the answer of @supercobra, but I would use the const keyword as it is in ES6 already available:

//
// ===== File globals.ts    
//
'use strict';

export const sep='/';
export const version: string="22.2.2";

C - function inside struct

You can pass the struct pointer to function as function argument. It called pass by reference.

If you modify something inside that pointer, the others will be updated to. Try like this:

typedef struct client_t client_t, *pno;
struct client_t
{
        pid_t pid;
        char password[TAM_MAX]; // -> 50 chars
        pno next;
};

pno AddClient(client_t *client)
{
        /* this will change the original client value */
        client.password = "secret";
}

int main()
{
    client_t client;

    //code ..

    AddClient(&client);
}

Is there an equivalent to background-size: cover and contain for image elements?

Assuming you can arrange to have a container element you wish to fill, this appears to work, but feels a bit hackish. In essence, I just use min/max-width/height on a larger area and then scale that area back into the original dimensions.

_x000D_

.container {_x000D_
  width: 800px;_x000D_
  height: 300px;_x000D_
  border: 1px solid black;_x000D_
  overflow:hidden;_x000D_
  position:relative;_x000D_
}_x000D_
.container.contain img {_x000D_
  position: absolute;_x000D_
  left:-10000%; right: -10000%; _x000D_
  top: -10000%; bottom: -10000%;_x000D_
  margin: auto auto;_x000D_
  max-width: 10%;_x000D_
  max-height: 10%;_x000D_
  -webkit-transform:scale(10);_x000D_
  transform: scale(10);_x000D_
}_x000D_
.container.cover img {_x000D_
  position: absolute;_x000D_
  left:-10000%; right: -10000%; _x000D_
  top: -10000%; bottom: -10000%;_x000D_
  margin: auto auto;_x000D_
  min-width: 1000%;_x000D_
  min-height: 1000%;_x000D_
  -webkit-transform:scale(0.1);_x000D_
  transform: scale(0.1);_x000D_
}

_x000D_

<h1>contain</h1>_x000D_
  <div class="container contain">_x000D_
    <img _x000D_
       src="https://www.google.de/logos/doodles/2014/european-parliament-election-2014-day-4-5483168891142144-hp.jpg" _x000D_
       />_x000D_
    <!-- 366x200 -->_x000D_
  </div>_x000D_
  <h1>cover</h1>_x000D_
  <div class="container cover">_x000D_
    <img _x000D_
       src="https://www.google.de/logos/doodles/2014/european-parliament-election-2014-day-4-5483168891142144-hp.jpg" _x000D_
       />_x000D_
    <!-- 366x200 -->_x000D_
  </div>

_x000D_

Better way to sort array in descending order

Sure, You can customize the sort.

You need to give the Sort() a delegate to a comparison method which it will use to sort.

Using an anonymous method:

Array.Sort<int>( array,
delegate(int a, int b)
  {
    return b - a; //Normal compare is a-b
  });

Pull all images from a specified directory and then display them

You can display all image from a folder using simple php script. Suppose folder name “images” and put some image in this folder and then use any text editor and paste this code and run this script. This is php code

    <?php
     $files = glob("images/*.*");
     for ($i=0; $i<count($files); $i++)
      {
        $image = $files[$i];
        $supported_file = array(
                'gif',
                'jpg',
                'jpeg',
                'png'
         );

         $ext = strtolower(pathinfo($image, PATHINFO_EXTENSION));
         if (in_array($ext, $supported_file)) {
            echo basename($image)."<br />"; // show only image name if you want to show full path then use this code // echo $image."<br />";
             echo '<img src="'.$image .'" alt="Random image" />'."<br /><br />";
            } else {
                continue;
            }
          }
       ?>

if you do not check image type then use this code

<?php
$files = glob("images/*.*");
for ($i = 0; $i < count($files); $i++) {
    $image = $files[$i];
    echo basename($image) . "<br />"; // show only image name if you want to show full path then use this code // echo $image."<br />";
    echo '<img src="' . $image . '" alt="Random image" />' . "<br /><br />";

}
?>

Import CSV to mysql table

if you have the ability to install phpadmin there is a import section where you can import csv files to your database there is even a checkbox to set the header to the first line of the file contains the table column names (if this is unchecked, the first line will become part of the data

Sleeping in a batch file

You could use the Windows cscript WSH layer and this wait.js JavaScript file:

if (WScript.Arguments.Count() == 1)
    WScript.Sleep(WScript.Arguments(0)*1000);
else
    WScript.Echo("Usage: cscript wait.js seconds");

How to check if AlarmManager already has an alarm set?

Following up on the comment ron posted, here is the detailed solution. Let's say you have registered a repeating alarm with a pending intent like this:

Intent intent = new Intent("com.my.package.MY_UNIQUE_ACTION");
PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, 
                                      intent, PendingIntent.FLAG_UPDATE_CURRENT);
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(System.currentTimeMillis());
calendar.add(Calendar.MINUTE, 1);

AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), 1000 * 60, pendingIntent);

The way you would check to see if it is active is to:

boolean alarmUp = (PendingIntent.getBroadcast(context, 0, 
        new Intent("com.my.package.MY_UNIQUE_ACTION"), 
        PendingIntent.FLAG_NO_CREATE) != null);

if (alarmUp)
{
    Log.d("myTag", "Alarm is already active");
}

The key here is the FLAG_NO_CREATE which as described in the javadoc: if the described PendingIntent **does not** already exists, then simply return null (instead of creating a new one)

SQLite: How do I save the result of a query as a CSV file?

All the existing answers only work from the sqlite command line, which isn't ideal if you'd like to build a reusable script. Python makes it easy to build a script that can be executed programatically.

import pandas as pd
import sqlite3

conn = sqlite3.connect('your_cool_database.sqlite')

df = pd.read_sql('SELECT * from orders', conn)
df.to_csv('orders.csv', index = False)

You can customize the query to only export part of the sqlite table to the CSV file.

You can also run a single command to export all sqlite tables to CSV files:

for table in c.execute("SELECT name FROM sqlite_master WHERE type='table';").fetchall():
    t = table[0]
    df = pd.read_sql('SELECT * from ' + t, conn)
    df.to_csv(t + '_one_command.csv', index = False)

See here for more info.

How to get my project path?

Your program has no knowledge of where your VS project is, so see get path for my .exe and go ../.. to get your project's path.

How to round up the result of integer division?

I had a similar need where I needed to convert Minutes to hours & minutes. What I used was:

int hrs = 0; int mins = 0;

float tm = totalmins;

if ( tm > 60 ) ( hrs = (int) (tm / 60);

mins = (int) (tm - (hrs * 60));

System.out.println("Total time in Hours & Minutes = " + hrs + ":" + mins);

jquery data selector

Here's a plugin that simplifies life https://github.com/rootical/jQueryDataSelector

Use it like that:

data selector           jQuery selector
  $$('name')              $('[data-name]')
  $$('name', 10)          $('[data-name=10]')
  $$('name', false)       $('[data-name=false]')
  $$('name', null)        $('[data-name]')
  $$('name', {})          Syntax error

How to convert time milliseconds to hours, min, sec format in JavaScript?

This solution uses one function to split milliseconds into a parts object, and another function to format the parts object.

I created 2 format functions, one as you requested, and another that prints a friendly string and considering singular/plural, and includes an option to show milliseconds.

_x000D_

function parseDuration(duration) {_x000D_
  let remain = duration_x000D_
_x000D_
  let days = Math.floor(remain / (1000 * 60 * 60 * 24))_x000D_
  remain = remain % (1000 * 60 * 60 * 24)_x000D_
_x000D_
  let hours = Math.floor(remain / (1000 * 60 * 60))_x000D_
  remain = remain % (1000 * 60 * 60)_x000D_
_x000D_
  let minutes = Math.floor(remain / (1000 * 60))_x000D_
  remain = remain % (1000 * 60)_x000D_
_x000D_
  let seconds = Math.floor(remain / (1000))_x000D_
  remain = remain % (1000)_x000D_
_x000D_
  let milliseconds = remain_x000D_
_x000D_
  return {_x000D_
    days,_x000D_
    hours,_x000D_
    minutes,_x000D_
    seconds,_x000D_
    milliseconds_x000D_
  };_x000D_
}_x000D_
_x000D_
function formatTime(o, useMilli = false) {_x000D_
  let parts = []_x000D_
  if (o.days) {_x000D_
    let ret = o.days + ' day'_x000D_
    if (o.days !== 1) {_x000D_
      ret += 's'_x000D_
    }_x000D_
    parts.push(ret)_x000D_
  }_x000D_
  if (o.hours) {_x000D_
    let ret = o.hours + ' hour'_x000D_
    if (o.hours !== 1) {_x000D_
      ret += 's'_x000D_
    }_x000D_
    parts.push(ret)_x000D_
  }_x000D_
  if (o.minutes) {_x000D_
    let ret = o.minutes + ' minute'_x000D_
    if (o.minutes !== 1) {_x000D_
      ret += 's'_x000D_
    }_x000D_
    parts.push(ret)_x000D_
_x000D_
  }_x000D_
  if (o.seconds) {_x000D_
    let ret = o.seconds + ' second'_x000D_
    if (o.seconds !== 1) {_x000D_
      ret += 's'_x000D_
    }_x000D_
    parts.push(ret)_x000D_
  }_x000D_
  if (useMilli && o.milliseconds) {_x000D_
    let ret = o.milliseconds + ' millisecond'_x000D_
    if (o.milliseconds !== 1) {_x000D_
      ret += 's'_x000D_
    }_x000D_
    parts.push(ret)_x000D_
  }_x000D_
  if (parts.length === 0) {_x000D_
    return 'instantly'_x000D_
  } else {_x000D_
    return parts.join(' ')_x000D_
  }_x000D_
}_x000D_
_x000D_
function formatTimeHMS(o) {_x000D_
  let hours = o.hours.toString()_x000D_
  if (hours.length === 1) hours = '0' + hours_x000D_
_x000D_
  let minutes = o.minutes.toString()_x000D_
  if (minutes.length === 1) minutes = '0' + minutes_x000D_
_x000D_
  let seconds = o.seconds.toString()_x000D_
  if (seconds.length === 1) seconds = '0' + seconds_x000D_
_x000D_
  return hours + ":" + minutes + ":" + seconds_x000D_
}_x000D_
_x000D_
function formatDurationHMS(duration) {_x000D_
  let time = parseDuration(duration)_x000D_
  return formatTimeHMS(time)_x000D_
}_x000D_
_x000D_
function formatDuration(duration, useMilli = false) {_x000D_
  let time = parseDuration(duration)_x000D_
  return formatTime(time, useMilli)_x000D_
}_x000D_
_x000D_
_x000D_
console.log(formatDurationHMS(57742343234))_x000D_
_x000D_
console.log(formatDuration(57742343234))_x000D_
console.log(formatDuration(5423401000))_x000D_
console.log(formatDuration(500))_x000D_
console.log(formatDuration(500, true))_x000D_
console.log(formatDuration(1000 * 30))_x000D_
console.log(formatDuration(1000 * 60 * 30))_x000D_
console.log(formatDuration(1000 * 60 * 60 * 12))_x000D_
console.log(formatDuration(1000 * 60 * 60 * 1))

_x000D_

get UTC time in PHP

$time = time();
$check = $time+date("Z",$time);
echo strftime("%B %d, %Y @ %H:%M:%S UTC", $check);

How do I check CPU and Memory Usage in Java?

From here

    OperatingSystemMXBean operatingSystemMXBean = (OperatingSystemMXBean) ManagementFactory.getOperatingSystemMXBean();
    RuntimeMXBean runtimeMXBean = ManagementFactory.getRuntimeMXBean();
    int availableProcessors = operatingSystemMXBean.getAvailableProcessors();
    long prevUpTime = runtimeMXBean.getUptime();
    long prevProcessCpuTime = operatingSystemMXBean.getProcessCpuTime();
    double cpuUsage;
    try
    {
        Thread.sleep(500);
    }
    catch (Exception ignored) { }

    operatingSystemMXBean = (OperatingSystemMXBean) ManagementFactory.getOperatingSystemMXBean();
    long upTime = runtimeMXBean.getUptime();
    long processCpuTime = operatingSystemMXBean.getProcessCpuTime();
    long elapsedCpu = processCpuTime - prevProcessCpuTime;
    long elapsedTime = upTime - prevUpTime;

    cpuUsage = Math.min(99F, elapsedCpu / (elapsedTime * 10000F * availableProcessors));
    System.out.println("Java CPU: " + cpuUsage);

How to include !important in jquery

If you really need to override css that has !important rules in it, for instance, in a case I ran into recently, overriding a wordpress theme required !important scss rules to break the theme, but since I was transpiling my code with webpack and (I assume this is why --)my css came along in the chain after the transpiled javascript, you can add a separate class rule in your stylesheet that overrides the first !important rule in the cascade, and toggle the heavier-weighted class rather than adjusting css dynamically. Just a thought.

Equivalent of *Nix 'which' command in PowerShell?

I usually just type:

gcm notepad

gcm note*

gcm is the default alias for Get-Command.

On my system, gcm note* outputs:

[27] » gcm note*

CommandType     Name                                                     Definition
-----------     ----                                                     ----------
Application     notepad.exe                                              C:\WINDOWS\notepad.exe
Application     notepad.exe                                              C:\WINDOWS\system32\notepad.exe
Application     Notepad2.exe                                             C:\Utils\Notepad2.exe
Application     Notepad2.ini                                             C:\Utils\Notepad2.ini

You get the directory and the command that matches what you're looking for.

Change Background color (css property) using Jquery

The code below will change the div to blue.

<script>
 $(document).ready(function(){ 
   $("#co").click({
            $("body").css("background-color","blue");
      });
    }); 
</script>
<body>
      <div id="co">hello</div>
</body>

How to convert Double to int directly?

try casting the value

double d = 1.2345;
long l = (long) d;

How can I tell if a VARCHAR variable contains a substring?

CONTAINS is for a Full Text Indexed field - if not, then use LIKE

Center Oversized Image in Div

The width and height are only for example:

parentDiv{
    width: 100px;
    height: 100px;
    position:relative; 
}
innerDiv{
    width: 200px;
    height: 200px;
    position:absolute; 
    margin: auto;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
}

It has to work for you if the left and top of your parent div are not the very top and left of the window of your screen. It works for me.

How do you make a div follow as you scroll?

You can either use the css property Fixed, or if you need something more fine-tuned then you need to use javascript and track the scrollTop property which defines where the user agent's scrollbar location is (0 being at the top ... and x being at the bottom)

.Fixed
{
    position: fixed;
    top: 20px;
}

or with jQuery:

$('#ParentContainer').scroll(function() { 
    $('#FixedDiv').css('top', $(this).scrollTop());
});

Is there a good Valgrind substitute for Windows?

Why not use Valgrind + Wine to debug your Windows app? See http://wiki.winehq.org/Wine_and_Valgrind

(Chromium uses this to check the Windows version for memory errors; see build.chromium.org and look at the experimental or memory waterfalls, and search for wine.)

There's also Dr. Memory, see dynamorio.org/drmemory.html

Excel VBA Loop on columns

Another method to try out. Also select could be replaced when you set the initial column into a Range object. Performance wise it helps.

Dim rng as Range

Set rng = WorkSheets(1).Range("A1") '-- you may change the sheet name according to yours.

'-- here is your loop
i = 1
Do
   '-- do something: e.g. show the address of the column that you are currently in
   Msgbox rng.offset(0,i).Address 
   i = i + 1
Loop Until i > 10

** Two methods to get the column name using column number**

Split()

code

colName = Split(Range.Offset(0,i).Address, "$")(1)

String manipulation:

code

Function myColName(colNum as Long) as String
    myColName = Left(Range(0, colNum).Address(False, False), _ 
    1 - (colNum > 10)) 
End Function

Use StringFormat to add a string to a WPF XAML binding

Here's an alternative that works well for readability if you have the Binding in the middle of the string or multiple bindings:

<TextBlock>
  <Run Text="Temperature is "/>
  <Run Text="{Binding CelsiusTemp}"/>
  <Run Text="°C"/>  
</TextBlock>

<!-- displays: 0°C (32°F)-->
<TextBlock>
  <Run Text="{Binding CelsiusTemp}"/>
  <Run Text="°C"/>
  <Run Text=" ("/>
  <Run Text="{Binding Fahrenheit}"/>
  <Run Text="°F)"/>
</TextBlock>

Getting DOM elements by classname

Update: Xpath version of *[@class~='my-class'] css selector

So after my comment below in response to hakre's comment, I got curious and looked into the code behind Zend_Dom_Query. It looks like the above selector is compiled to the following xpath (untested):

[contains(concat(' ', normalize-space(@class), ' '), ' my-class ')]

So the PHP would be:

$dom = new DomDocument();
$dom->load($filePath);
$finder = new DomXPath($dom);
$classname="my-class";
$nodes = $finder->query("//*[contains(concat(' ', normalize-space(@class), ' '), ' $classname ')]");

Basically, all we do here is normalize the class attribute so that even a single class is bounded by spaces, and the complete class list is bounded in spaces. Then append the class we are searching for with a space. This way we are effectively looking for and find only instances of my-class .

Use an xpath selector?

$dom = new DomDocument();
$dom->load($filePath);
$finder = new DomXPath($dom);
$classname="my-class";
$nodes = $finder->query("//*[contains(@class, '$classname')]");

If it is only ever one type of element you can replace the * with the particular tagname.

If you need to do a lot of this with very complex selector I would recommend Zend_Dom_Query which supports CSS selector syntax (a la jQuery):

$finder = new Zend_Dom_Query($html);
$classname = 'my-class';
$nodes = $finder->query("*[class~=\"$classname\"]");

How to resolve ORA 00936 Missing Expression Error?

Remove the comma?

select /*+USE_HASH( a b ) */ to_char(date, 'MM/DD/YYYY HH24:MI:SS') as LABEL,
ltrim(rtrim(substr(oled, 9, 16))) as VALUE
from rrfh a, rrf b
where ltrim(rtrim(substr(oled, 1, 9))) = 'stata kish' 
and a.xyz = b.xyz

Have a look at FROM

SELECTING from multiple tables You can include multiple tables in the FROM clause by listing the tables with a comma in between each table name

Negation in Python

try instead:

if not os.path.exists(pathName):
    do this

Jquery sortable 'change' event element position

Use update, stop and receive events, check it over here

Jquery Sortable Update Event can called only one time?

Flatten an irregular list of lists

def flatten(xs):
    res = []
    def loop(ys):
        for i in ys:
            if isinstance(i, list):
                loop(i)
            else:
                res.append(i)
    loop(xs)
    return res

Have log4net use application config file for configuration data

Have you tried adding a configsection handler to your app.config? e.g.

<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net"/>

Duplicate and rename Xcode project & associated folders

This answer is the culmination of various other StackOverflow posts and tutorials around the internet brought into one place for my future reference, and to help anyone else who may be facing the same issue. All credit is given for other answers at the end.

Duplicating an Xcode Project

In the Finder, duplicate the project folder to the desired location of your new project. Do not rename the .xcodeproj file name or any associated folders at this stage.
In Xcode, rename the project. Select your project from the navigator pane (left pane). In the Utilities pane (right pane) rename your project, Accept the changes Xcode proposes.
In Xcode, rename the schemes in "Manage Schemes", also rename any targets you may have.
If you're not using the default Bundle Identifier which contains the current PRODUCT_NAME at the end (so will update automatically), then change your Bundle Identifier to the new one you will be using for your duplicated project.

Renaming the source folder

So after following the above steps you should have a duplicated and renamed Xcode project that should build and compile successfully, however your source code folder will still be named as it was in the original project. This doesn't cause any compiler issues, but it's not the clearest file structure for people to navigate in SCM, etc. To rename this folder without breaking all your file links, follow these steps:

In the Finder, rename the source folder. This will break your project, because Xcode won't automatically detect the changes. All of your xcode file listings will lose their links with the actual files, so will all turn red.
In Xcode, click on the virtual folder which you renamed (This will likely be right at the top, just under your actual .xcodeproject) Rename this to match the name in the Finder, this won't fix anything and strictly isn't a required step but it's nice to have the file names matching.
In Xcode, Select the folder you just renamed in the navigation pane. Then in the Utilities pane (far right) click the icon that looks like dark grey folder, just underneath the 'Location' drop down menu. From here, navigate to your renamed folder in the finder and click 'Choose'. This will automagically re-associate all your files, and they should no longer appear red within the Xcode navigation pane.

Icon to click

In your project / targets build settings, search for the old folder name and manually rename any occurrences you find. Normally there is one for the prefix.pch and one for the info.plist, but there may be more.
If you are using any third party libraries (Testflight/Hockeyapp/etc) you will also need to search for 'Library Search Paths' and rename any occurrences of the old file name here too.
Repeat this process for any unit test source code folders your project may contain, the process is identical.

This should allow you to duplicate & rename an xcode project and all associated files without having to manually edit any xcode files, and risk messing things up.

Credits

Many thanks is given to Nick Lockwood, and Pauly Glott for providing the separate answers to this problem.

What is and how to fix System.TypeInitializationException error?

I experienced the System.TypeInitializationException due to a different error in my .NET framework 4 project's app.config. Thank you to pStan for getting me to look at the app.config. My configSections were properly defined. However, an undefined element within one of the sections caused the exception to be thrown.

Bottom line is that problems in the app.config can generated this very misleading TypeInitializationException.

A more meaningful ConfigurationErrorsException can be generated by the same error in the app.config by waiting to access the config values until you are within a method rather than at the class level of the code.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Configuration;
using System.Collections.Specialized;

namespace ConfigTest
{
    class Program
    {
        public static string machinename;
        public static string hostname;
        public static NameValueCollection _AppSettings;

        static void Main(string[] args)
        {
            machinename = System.Net.Dns.GetHostName().ToLower();
            hostname = "abc.com";// System.Net.Dns.GetHostEntry(System.Net.Dns.GetHostName()).HostName.ToLower().Replace(machinename + ".", "");
            _AppSettings = ConfigurationManager.GetSection("domain/" + hostname) as System.Collections.Specialized.NameValueCollection;
        }
    }
}

How can I insert binary file data into a binary SQL field using a simple insert statement?

I believe this would be somewhere close.

INSERT INTO Files
(FileId, FileData)
SELECT 1, * FROM OPENROWSET(BULK N'C:\Image.jpg', SINGLE_BLOB) rs

Something to note, the above runs in SQL Server 2005 and SQL Server 2008 with the data type as varbinary(max). It was not tested with image as data type.

Why is setState in reactjs Async instead of Sync?

Imagine incrementing a counter in some component:

  class SomeComponent extends Component{

    state = {
      updatedByDiv: '',
      updatedByBtn: '',
      counter: 0
    }

    divCountHandler = () => {
      this.setState({
        updatedByDiv: 'Div',
        counter: this.state.counter + 1
      });
      console.log('divCountHandler executed');
    }

    btnCountHandler = () => {
      this.setState({
        updatedByBtn: 'Button',
        counter: this.state.counter + 1
      });
      console.log('btnCountHandler executed');
    }
    ...
    ...
    render(){
      return (
        ...
        // a parent div
        <div onClick={this.divCountHandler}>
          // a child button
          <button onClick={this.btnCountHandler}>Increment Count</button>
        </div>
        ...
      )
    }
  }

There is a count handler attached to both the parent and the child components. This is done purposely so we can execute the setState() twice within the same click event bubbling context, but from within 2 different handlers.

As we would imagine, a single click event on the button would now trigger both these handlers since the event bubbles from target to the outermost container during the bubbling phase.

Therefore the btnCountHandler() executes first, expected to increment the count to 1 and then the divCountHandler() executes, expected to increment the count to 2.

However the count only increments to 1 as you can inspect in React Developer tools.

This proves that react

queues all the setState calls
comes back to this queue after executing the last method in the context(the divCountHandler in this case)
merges all the object mutations happening within multiple setState calls in the same context(all method calls within a single event phase is same context for e.g.) into one single object mutation syntax (merging makes sense because this is why we can update the state properties independently in setState() in the first place)
and passes it into one single setState() to prevent re-rendering due to multiple setState() calls (this is a very primitive description of batching).

Resultant code run by react:

this.setState({
  updatedByDiv: 'Div',
  updatedByBtn: 'Button',
  counter: this.state.counter + 1
})

To stop this behaviour, instead of passing objects as arguments to the setState method, callbacks are passed.

    divCountHandler = () => {
          this.setState((prevState, props) => {
            return {
              updatedByDiv: 'Div',
              counter: prevState.counter + 1
            };
          });
          console.log('divCountHandler executed');
        }

    btnCountHandler = () => {
          this.setState((prevState, props) => {
            return {
              updatedByBtn: 'Button',
              counter: prevState.counter + 1
            };
          });
      console.log('btnCountHandler executed');
    }

After the last method finishes execution and when react returns to process the setState queue, it simply calls the callback for each setState queued, passing in the previous component state.

This way react ensures that the last callback in the queue gets to update the state that all of its previous counterparts have laid hands on.

Python WindowsError: [Error 123] The filename, directory name, or volume label syntax is incorrect:

I had a similar issue while working with Jupyter. I was trying to copy files from one directory to another using copy function of shutil. The problem was that I had forgotten to import the package.(Silly) But instead of python giving import error, it gave this error.

Solved by adding:

from shutil import copy

How to set up datasource with Spring for HikariCP?

May this also can help using configuration file like java class way.

@Configuration
@PropertySource("classpath:application.properties")
public class DataSourceConfig {
    @Autowired
    JdbcConfigProperties jdbc;


    @Bean(name = "hikariDataSource")
    public DataSource hikariDataSource() {
        HikariConfig config = new HikariConfig();
        HikariDataSource dataSource;

        config.setJdbcUrl(jdbc.getUrl());
        config.setUsername(jdbc.getUser());
        config.setPassword(jdbc.getPassword());
        // optional: Property setting depends on database vendor
        config.addDataSourceProperty("cachePrepStmts", "true");
        config.addDataSourceProperty("prepStmtCacheSize", "250");
        config.addDataSourceProperty("prepStmtCacheSqlLimit", "2048");
        dataSource = new HikariDataSource(config);

        return dataSource;
    }
}

How to use it:

@Component
public class Car implements Runnable {
    private static final Logger logger = LoggerFactory.getLogger(AptSommering.class);


    @Autowired
    @Qualifier("hikariDataSource")
    private DataSource hikariDataSource;


}

Inserting image into IPython notebook markdown

If you want to display the image in a Markdown cell then use:

<img src="files/image.png" width="800" height="400">

If you want to display the image in a Code cell then use:

from IPython.display import Image
Image(filename='output1.png',width=800, height=400)

How do you declare string constants in C?

There's one more (at least) road to Rome:

static const char HELLO3[] = "Howdy";

(static — optional — is to prevent it from conflicting with other files). I'd prefer this one over const char*, because then you'll be able to use sizeof(HELLO3) and therefore you don't have to postpone till runtime what you can do at compile time.

The define has an advantage of compile-time concatenation, though (think HELLO ", World!") and you can sizeof(HELLO) as well.

But then you can also prefer const char* and use it across multiple files, which would save you a morsel of memory.

In short — it depends.

How can I format a decimal to always show 2 decimal places?

You can use the string formatting operator as so:

num = 49
x = "%.2f" % num  # x is now the string "49.00"

I'm not sure what you mean by "efficient" -- this is almost certainly not the bottleneck of your application. If your program is running slowly, profile it first to find the hot spots, and then optimize those.

Chart.js v2 hide dataset labels

new Chart('idName', {
      type: 'typeChar',
      data: data,
      options: {
        legend: {
          display: false
        }
      }
    });

How to copy files from host to Docker container?

Copy from container to host dir

docker cp [container-name/id]:./app/[index.js] index.js

(assume you have created a workdir /app in your dockerfile)

Copy from host to container

docker cp index.js [container-name/id]:./app/index.js

How can I read pdf in python?

Try PyPDF2.

There is a good tutorial here: https://automatetheboringstuff.com/chapter13/

Ruby on Rails. How do I use the Active Record .build method in a :belongs to relationship?

@article = user.articles.build(:title => "MainTitle")
@article.save

Removing double quotes from variables in batch file creates problems with CMD environment

I thought I had the solution, but I soon experienced unusual behavior with execution of batch files. Suddenly CMD is no recognizing long path statments. Normal execution of batch file from full path

C:\Documents and Settings\Administrator\My Documents\Txt\batchtest\dataout.bat

returns

'C:\Documents' is not recognized as an internal or external command....

There's your whole problem. CMD doesn't understand spaces inside of filenames from the command line, so it thinks you're trying to pass

and Settings\Administrator\My Documents\Txt\batchtest\dataout.bat

as parameters to the

"C:\Documents"

program.

You need to quote it to run a batch file with spaces in the path:

> "C:\Documents and Settings\Administrator\My Documents\Txt\batchtest\dataout.bat"

would have worked.

How to resolve ORA-011033: ORACLE initialization or shutdown in progress

I had a similar problem when I had installed the 12c database as per Oracle's tutorial . The instruction instructs reader to create a PLUGGABLE DATABASE (pdb).

The problem

sqlplus hr/hr@pdborcl would result in ORACLE initialization or shutdown in progress.

The solution

1. Login as SYSDBA to the dabase :
```
sqlplus SYS/Oracle_1@pdborcl AS SYSDBA
```

Alter database:

alter pluggable database pdborcl open read write;

1. Login again:
```
sqlplus hr/hr@pdborcl
```

That worked for me

Some documentation here

How do I grep recursively?

Throwing my two cents here. As others already mentioned grep -r doesn't work on every platform. This may sound silly but I always use git.

git grep "texthere"

Even if the directory is not staged, I just stage it and use git grep.

How to cin Space in c++?

Using cin's >> operator will drop leading whitespace and stop input at the first trailing whitespace. To grab an entire line of input, including spaces, try cin.getline(). To grab one character at a time, you can use cin.get().

How can I save an image with PIL?

Try removing the . before the .bmp (it isn't matching BMP as expected). As you can see from the error, the save_handler is upper-casing the format you provided and then looking for a match in SAVE. However the corresponding key in that object is BMP (instead of .BMP).

I don't know a great deal about PIL, but from some quick searching around it seems that it is a problem with the mode of the image. Changing the definition of j to:

j = Image.fromarray(b, mode='RGB')

Seemed to work for me (however note that I have very little knowledge of PIL, so I would suggest using @mmgp's solution as s/he clearly knows what they are doing :) ). For the types of mode, I used this page - hopefully one of the choices there will work for you.

How to check queue length in Python

it is simple just use .qsize() example:

a=Queue()
a.put("abcdef")
print a.qsize() #prints 1 which is the size of queue

The above snippet applies for Queue() class of python. Thanks @rayryeng for the update.

for deque from collections we can use len() as stated here by K Z.

System.Threading.Timer in C# it seems to be not working. It runs very fast every 3 second

It is not necessary to stop timer, see nice solution from this post:

"You could let the timer continue firing the callback method but wrap your non-reentrant code in a Monitor.TryEnter/Exit. No need to stop/restart the timer in that case; overlapping calls will not acquire the lock and return immediately."

private void CreatorLoop(object state) 
 {
   if (Monitor.TryEnter(lockObject))
   {
     try
     {
       // Work here
     }
     finally
     {
       Monitor.Exit(lockObject);
     }
   }
 }

Subscript out of bounds - general definition and solution?

I sometimes encounter the same issue. I can only answer your second bullet, because I am not as expert in R as I am with other languages. I have found that the standard for loop has some unexpected results. Say x = 0

for (i in 1:x) {
  print(i)
}

The output is

[1] 1
[1] 0

Whereas with python, for example

for i in range(x):
  print i

does nothing. The loop is not entered.

I expected that if x = 0 that in R, the loop would not be entered. However, 1:0 is a valid range of numbers. I have not yet found a good workaround besides having an if statement wrapping the for loop

TypeError: Invalid dimensions for image data when plotting array with imshow()

There is a (somewhat) related question on StackOverflow:

Showing an image with pylab.imshow()

Here the problem was that an array of shape (nx,ny,1) is still considered a 3D array, and must be squeezed or sliced into a 2D array.

More generally, the reason for the Exception

TypeError: Invalid dimensions for image data

is shown here: matplotlib.pyplot.imshow() needs a 2D array, or a 3D array with the third dimension being of shape 3 or 4!

You can easily check this with (these checks are done by imshow, this function is only meant to give a more specific message in case it's not a valid input):

from __future__ import print_function
import numpy as np

def valid_imshow_data(data):
    data = np.asarray(data)
    if data.ndim == 2:
        return True
    elif data.ndim == 3:
        if 3 <= data.shape[2] <= 4:
            return True
        else:
            print('The "data" has 3 dimensions but the last dimension '
                  'must have a length of 3 (RGB) or 4 (RGBA), not "{}".'
                  ''.format(data.shape[2]))
            return False
    else:
        print('To visualize an image the data must be 2 dimensional or '
              '3 dimensional, not "{}".'
              ''.format(data.ndim))
        return False

In your case:

>>> new_SN_map = np.array([1,2,3])
>>> valid_imshow_data(new_SN_map)
To visualize an image the data must be 2 dimensional or 3 dimensional, not "1".
False

The np.asarray is what is done internally by matplotlib.pyplot.imshow so it's generally best you do it too. If you have a numpy array it's obsolete but if not (for example a list) it's necessary.

In your specific case you got a 1D array, so you need to add a dimension with np.expand_dims()

import matplotlib.pyplot as plt
a = np.array([1,2,3,4,5])
a = np.expand_dims(a, axis=0)  # or axis=1
plt.imshow(a)
plt.show()

or just use something that accepts 1D arrays like plot:

a = np.array([1,2,3,4,5])
plt.plot(a)
plt.show()

Using custom std::set comparator

std::less<> when using custom classes with operator<

If you are dealing with a set of your custom class that has operator< defined, then you can just use std::less<>.

As mentioned at http://en.cppreference.com/w/cpp/container/set/find C++14 has added two new find APIs:

template< class K > iterator find( const K& x );
template< class K > const_iterator find( const K& x ) const;

which allow you to do:

main.cpp

#include <cassert>
#include <set>

class Point {
    public:
        // Note that there is _no_ conversion constructor,
        // everything is done at the template level without
        // intermediate object creation.
        //Point(int x) : x(x) {}
        Point(int x, int y) : x(x), y(y) {}
        int x;
        int y;
};
bool operator<(const Point& c, int x) { return c.x < x; }
bool operator<(int x, const Point& c) { return x < c.x; }
bool operator<(const Point& c, const Point& d) {
    return c.x < d;
}

int main() {
    std::set<Point, std::less<>> s;
    s.insert(Point(1, -1));
    s.insert(Point(2, -2));
    s.insert(Point(0,  0));
    s.insert(Point(3, -3));
    assert(s.find(0)->y ==  0);
    assert(s.find(1)->y == -1);
    assert(s.find(2)->y == -2);
    assert(s.find(3)->y == -3);
    // Ignore 1234, find 1.
    assert(s.find(Point(1, 1234))->y == -1);
}

Compile and run:

g++ -std=c++14 -Wall -Wextra -pedantic -o main.out main.cpp
./main.out

More info about std::less<> can be found at: What are transparent comparators?

Tested on Ubuntu 16.10, g++ 6.2.0.

Twitter Bootstrap - add top space between rows

<div class="row row-padding">

simple code

What's the best CRLF (carriage return, line feed) handling strategy with Git?

Almost four years after asking this question, I have finally found an answer that completely satisfies me!

See the details in github:help's guide to Dealing with line endings.

Git allows you to set the line ending properties for a repo directly using the text attribute in the .gitattributes file. This file is committed into the repo and overrides the core.autocrlf setting, allowing you to ensure consistent behaviour for all users regardless of their git settings.

And thus

The advantage of this is that your end of line configuration now travels with your repository and you don't need to worry about whether or not collaborators have the proper global settings.

Here's an example of a .gitattributes file

# Auto detect text files and perform LF normalization
*        text=auto

*.cs     text diff=csharp
*.java   text diff=java
*.html   text diff=html
*.css    text
*.js     text
*.sql    text

*.csproj text merge=union
*.sln    text merge=union eol=crlf

*.docx   diff=astextplain
*.DOCX   diff=astextplain

# absolute paths are ok, as are globs
/**/postinst* text eol=lf

# paths that don't start with / are treated relative to the .gitattributes folder
relative/path/*.txt text eol=lf

There is a convenient collection of ready to use .gitattributes files for the most popular programming languages. It's useful to get you started.

Once you've created or adjusted your .gitattributes, you should perform a once-and-for-all line endings re-normalization.

Note that the GitHub Desktop app can suggest and create a .gitattributes file after you open your project's Git repo in the app. To try that, click the gear icon (in the upper right corner) > Repository settings ... > Line endings and attributes. You will be asked to add the recommended .gitattributes and if you agree, the app will also perform a normalization of all the files in your repository.

Finally, the Mind the End of Your Line article provides more background and explains how Git has evolved on the matters at hand. I consider this required reading.

You've probably got users in your team who use EGit or JGit (tools like Eclipse and TeamCity use them) to commit their changes. Then you're out of luck, as @gatinueta explained in this answer's comments:

This setting will not satisfy you completely if you have people working with Egit or JGit in your team, since those tools will just ignore .gitattributes and happily check in CRLF files https://bugs.eclipse.org/bugs/show_bug.cgi?id=342372

One trick might be to have them commit their changes in another client, say SourceTree. Our team back then preferred that tool to Eclipse's EGit for many use cases.

Who said software is easy? :-/

XMLHttpRequest Origin null is not allowed Access-Control-Allow-Origin for file:/// to file:/// (Serverless)

You can try putting 'Access-Control-Allow-Origin':'*' in response.writeHead(, {[here]}).

How to read attribute value from XmlNode in C#?

you can loop through all attributes like you do with nodes

foreach (XmlNode item in node.ChildNodes)
{ 
    // node stuff...

    foreach (XmlAttribute att in item.Attributes)
    {
        // attribute stuff
    }
}

Optional Parameters in Go?

You can use a struct which includes the parameters:

type Params struct {
  a, b, c int
}

func doIt(p Params) int {
  return p.a + p.b + p.c 
}

// you can call it without specifying all parameters
doIt(Params{a: 1, c: 9})

Importing files from different folder

You can use importlib to import modules where you want to import a module from a folder using a string like so:

import importlib

scriptName = 'Snake'

script = importlib.import_module('Scripts\\.%s' % scriptName)

This example has a main.py which is the above code then a folder called Scripts and then you can call whatever you need from this folder by changing the scriptName variable. You can then use script to reference to this module. such as if I have a function called Hello() in the Snake module you can run this function by doing so:

script.Hello()

I have tested this in Python 3.6

How to check if object property exists with a variable holding the property name?

For own property :

var loan = { amount: 150 };
if(Object.prototype.hasOwnProperty.call(loan, "amount")) 
{ 
   //will execute
}

Note: using Object.prototype.hasOwnProperty is better than loan.hasOwnProperty(..), in case a custom hasOwnProperty is defined in the prototype chain (which is not the case here), like

var foo = {
      hasOwnProperty: function() {
        return false;
      },
      bar: 'Here be dragons'
    };

// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/hasOwnProperty

To include inherited properties in the finding use the in operator: (but you must place an object at the right side of 'in', primitive values will throw error, e.g. 'length' in 'home' will throw error, but 'length' in new String('home') won't)

const yoshi = { skulk: true };
const hattori = { sneak: true };
const kuma = { creep: true };
if ("skulk" in yoshi) 
    console.log("Yoshi can skulk");

if (!("sneak" in yoshi)) 
    console.log("Yoshi cannot sneak");

if (!("creep" in yoshi)) 
    console.log("Yoshi cannot creep");

Object.setPrototypeOf(yoshi, hattori);

if ("sneak" in yoshi)
    console.log("Yoshi can now sneak");
if (!("creep" in hattori))
    console.log("Hattori cannot creep");

Object.setPrototypeOf(hattori, kuma);

if ("creep" in hattori)
    console.log("Hattori can now creep");
if ("creep" in yoshi)
    console.log("Yoshi can also creep");

// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/in

Note: One may be tempted to use typeof and [ ] property accessor as the following code which doesn't work always ...

var loan = { amount: 150 };

loan.installment = undefined;

if("installment" in loan) // correct
{
    // will execute
}

if(typeof loan["installment"] !== "undefined") // incorrect
{
    // will not execute
}

How to close a Java Swing application from the code

In response to other comments, DISPOSE_ON_CLOSE does not seem to properly exit the application - it only destroys the window, but the application will continue running. If you want to terminate the application use EXIT_ON_CLOSE.

How to know if other threads have finished?

I would suggest looking at the javadoc for Thread class.

You have multiple mechanisms for thread manipulation.

Your main thread could join() the three threads serially, and would then not proceed until all three are done.
Poll the thread state of the spawned threads at intervals.
Put all of the spawned threads into a separate ThreadGroup and poll the activeCount() on the ThreadGroup and wait for it to get to 0.
Setup a custom callback or listener type of interface for inter-thread communication.

I'm sure there are plenty of other ways I'm still missing.

postgresql sequence nextval in schema

The quoting rules are painful. I think you want:

SELECT nextval('foo."SQ_ID"');

to prevent case-folding of SQ_ID.

Call to undefined method mysqli_stmt::get_result

So if the MySQL Native Driver (mysqlnd) driver is not available, and therefore using bind_result and fetch instead of get_result, the code becomes:

include 'conn.php';
$conn = new Connection();
$query = 'SELECT EmailVerified, Blocked FROM users WHERE Email = ? AND SLA = ? AND `Password` = ?';
$stmt = $conn->mysqli->prepare($query);
$stmt->bind_param('sss', $_POST['EmailID'], $_POST['SLA'], $_POST['Password']);
$stmt->execute();
$stmt->bind_result($EmailVerified, $Blocked);
while ($stmt->fetch())
{
   /* Use $EmailVerified and $Blocked */
}
$stmt->close();
$conn->mysqli->close();

How to convert View Model into JSON object in ASP.NET MVC?

@Html.Raw(Json.Encode(object)) can be used to convert the View Modal Object to JSON

Cocoa: What's the difference between the frame and the bounds?

Let me add my 5 cents.

Frame is used by the view's parent view to place it inside the parent view.

Bounds is used by the view itself to place it's own content (like a scroll view does while scrolling). See also clipsToBounds. Bounds also can be used to zoom in/out content of the view.

Analogy:
Frame ~ TV screen
Bounds ~ Camera (zoom, move, rotate)

How to Convert a Text File into a List in Python

Maybe:

crimefile = open(fileName, 'r')
yourResult = [line.split(',') for line in crimefile.readlines()]

how to use LIKE with column name

You're close.

The LIKE operator works with strings (CHAR, NVARCHAR, etc). so you need to concattenate the '%' symbol to the string...

MS SQL Server:

SELECT * FROM table1,table2 WHERE table1.x LIKE table2.y + '%'

Use of LIKE, however, is often slower than other operations. It's useful, powerful, flexible, but has performance considerations. I'll leave those for another topic though :)

EDIT:

I don't use MySQL, but this may work...

SELECT * FROM table1,table2 WHERE table1.x LIKE CONCAT(table2.y, '%')

How to run a JAR file

If you don't want to deal with those details, you can also use the export jar assistants from Eclipse or NetBeans.

What is process.env.PORT in Node.js?

In many environments (e.g. Heroku), and as a convention, you can set the environment variable PORT to tell your web server what port to listen on.

So process.env.PORT || 3000 means: whatever is in the environment variable PORT, or 3000 if there's nothing there.

So you pass that to app.listen, or to app.set('port', ...), and that makes your server able to accept a "what port to listen on" parameter from the environment.

If you pass 3000 hard-coded to app.listen(), you're always listening on port 3000, which might be just for you, or not, depending on your requirements and the requirements of the environment in which you're running your server.

Get the current cell in Excel VB

Try this

Dim app As Excel.Application = Nothing
Dim Active_Cell As Excel.Range = Nothing

Try
            app = CType(Marshal.GetActiveObject("Excel.Application"), Excel.Application)
 Active_Cell = app.ActiveCell

Catch ex As Exception
            MsgBox(ex.Message)
            Exit Sub
        End Try

'             .address will return the cell reference :)

Cloning an array in Javascript/Typescript

Below code might help you to copy the first level objects

let original = [{ a: 1 }, {b:1}]
const copy = [ ...original ].map(item=>({...item}))

so for below case, values remains intact

copy[0].a = 23
console.log(original[0].a) //logs 1 -- value didn't change voila :)

Fails for this case

let original = [{ a: {b:2} }, {b:1}]
const copy = [ ...original ].map(item=>({...item}))
copy[0].a.b = 23;
console.log(original[0].a) //logs 23 -- lost the original one :(

Final advice:

I would say go for lodash cloneDeep API which helps you to copy the objects inside objects completely dereferencing from original one's. This can be installed as a separate module.

Refer documentation: https://github.com/lodash/lodash

Individual Package : https://www.npmjs.com/package/lodash.clonedeep

Creating an R dataframe row-by-row

I've found this way to create dataframe by raw without matrix.

With automatic column name

df<-data.frame(
        t(data.frame(c(1,"a",100),c(2,"b",200),c(3,"c",300)))
        ,row.names = NULL,stringsAsFactors = FALSE
    )

With column name

df<-setNames(
        data.frame(
            t(data.frame(c(1,"a",100),c(2,"b",200),c(3,"c",300)))
            ,row.names = NULL,stringsAsFactors = FALSE
        ), 
        c("col1","col2","col3")
    )

Executing a shell script from a PHP script

Without really knowing the complexity of the setup, I like the sudo route. First, you must configure sudo to permit your webserver to sudo run the given command as root. Then, you need to have the script that the webserver shell_exec's(testscript) run the command with sudo.

For A Debian box with Apache and sudo:

Configure sudo:
- As root, run the following to edit a new/dedicated configuration file for sudo:
```
visudo -f /etc/sudoers.d/Webserver
```
  (or whatever you want to call your file in /etc/sudoers.d/)
- Add the following to the file:
```
www-data ALL = (root) NOPASSWD: <executable_file_path>
```
  where <executable_file_path> is the command that you need to be able to run as root with the full path in its name(say /bin/chown for the chown executable). If the executable will be run with the same arguments every time, you can add its arguments right after the executable file's name to further restrict its use.
  
  For example, say we always want to copy the same file in the /root/ directory, we would write the following:
```
www-data ALL = (root) NOPASSWD: /bin/cp /root/test1 /root/test2
```
Modify the script(testscript):

Edit your script such that sudo appears before the command that requires root privileges(say sudo /bin/chown ... or sudo /bin/cp /root/test1 /root/test2). Make sure that the arguments specified in the sudo configuration file exactly match the arguments used with the executable in this file. So, for our example above, we would have the following in the script:
```
sudo /bin/cp /root/test1 /root/test2
```

If you are still getting permission denied, the script file and it's parent directories' permissions may not allow the webserver to execute the script itself. Thus, you need to move the script to a more appropriate directory and/or change the script and parent directory's permissions to allow execution by www-data(user or group), which is beyond the scope of this tutorial.

Keep in mind:

When configuring sudo, the objective is to permit the command in it's most restricted form. For example, instead of permitting the general use of the cp command, you only allow the cp command if the arguments are, say, /root/test1 /root/test2. This means that cp's arguments(and cp's functionality cannot be altered).

FFMPEG mp4 from http live streaming m3u8 file?

Aergistal's answer works, but I found that converting to mp4 can make some m3u8 videos broken. If you are stuck with this problem, try to convert them to mkv, and convert them to mp4 later.

The permissions granted to user ' are insufficient for performing this operation. (rsAccessDenied)"}

For SQL Reporting Services 2012 - SP1 and SharePoint 2013.

I got the same issue: The permissions granted to user '[AppPoolAccount]' are insufficient for performing this operation.

I went into the service application settings, clicked Key Management, then Change key and had it regenerate the key.

Link to reload current page

For me, the answers previously provided here, were opening a new tab/window (probably because of my browser settings). But i wanted to reload/refresh on the same page. So, the above solutions did not work for me.

However, the good news is, the following (either of two) worked for me.

<a onclick="javascript:window.location.reload();"> refresh</a>
<a onclick="window.location.href=this">refresh</a>

RelativeLayout center vertical

        <RelativeLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_vertical"
        android:layout_marginHorizontal="5dp"
        android:layout_marginBottom="5dp"
        android:background="@drawable/default_button">

        <ImageView
            android:layout_width="20dp"
            android:layout_height="20dp"
            android:layout_alignParentLeft="true"
            android:layout_centerInParent="true"
            android:layout_marginStart="15dp"
            android:src="@drawable/google" />

        <Button
            android:id="@+id/btnGmailLogin"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@null"
            android:paddingHorizontal="15dp"
            android:text="@string/gmail_login_button_text"
            android:textAllCaps="false"
            android:textColor="@color/black" />
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