Programs & Examples On #Hexagonal tiles

Tessellating tiles for use as 2d-histogram bins, game boards, etc.

How to display scroll bar onto a html table

Not sure why no one mentioned to just use the built-in sticky header style for elements. Worked great for me.

.tableContainerDiv {
   overflow: auto;
   max-height: 80em;
}
th {
   position: sticky;
   top: 0;
   background: white;
}

Put a min-width on the in @media if you need to make responsive (or similar).

see Table headers position:sticky or Position Sticky and Table Headers

How to truncate float values?

A general and simple function to use:

def truncate_float(number, length):
    """Truncate float numbers, up to the number specified
    in length that must be an integer"""

    number = number * pow(10, length)
    number = int(number)
    number = float(number)
    number /= pow(10, length)
    return number

"echo -n" prints "-n"

To achieve this there are basically two methods which I frequently use:

1. Using the cursor escape character (\c) with echo -e

Example :

for i in {0..10..2}; do
  echo -e "$i \c"              
done
# 0 2 4 6 8 10
  • -e flag enables the Escape characters in the string.
  • \c brings the Cursor back to the current line.

OR

2. Using the printf command

Example:

for ((i = 0; i < 5; ++i)); do
  printf "$i "
done
# 0 1 2 3 4

Center a 'div' in the middle of the screen, even when the page is scrolled up or down?

Quote: I would like to know how to display the div in the middle of the screen, whether user has scrolled up/down.

Change

position: absolute;

To

position: fixed;

W3C specifications for position: absolute and for position: fixed.

What does it mean to "program to an interface"?

It sounds like you understand how interfaces work but are unsure of when to use them and what advantages they offer. Here are a few examples of when an interface would make sense:

// if I want to add search capabilities to my application and support multiple search
// engines such as Google, Yahoo, Live, etc.

interface ISearchProvider
{
    string Search(string keywords);
}

then I could create GoogleSearchProvider, YahooSearchProvider, LiveSearchProvider, etc.

// if I want to support multiple downloads using different protocols
// HTTP, HTTPS, FTP, FTPS, etc.
interface IUrlDownload
{
    void Download(string url)
}

// how about an image loader for different kinds of images JPG, GIF, PNG, etc.
interface IImageLoader
{
    Bitmap LoadImage(string filename)
}

then create JpegImageLoader, GifImageLoader, PngImageLoader, etc.

Most add-ins and plugin systems work off interfaces.

Another popular use is for the Repository pattern. Say I want to load a list of zip codes from different sources

interface IZipCodeRepository
{
    IList<ZipCode> GetZipCodes(string state);
}

then I could create an XMLZipCodeRepository, SQLZipCodeRepository, CSVZipCodeRepository, etc. For my web applications, I often create XML repositories early on so I can get something up and running before the SQL Database is ready. Once the database is ready I write an SQLRepository to replace the XML version. The rest of my code remains unchanged since it runs solely off of interfaces.

Methods can accept interfaces such as:

PrintZipCodes(IZipCodeRepository zipCodeRepository, string state)
{
    foreach (ZipCode zipCode in zipCodeRepository.GetZipCodes(state))
    {
        Console.WriteLine(zipCode.ToString());
    }
}

Please add a @Pipe/@Directive/@Component annotation. Error

You have a typo in the import in your LoginComponent's file

import { Component } from '@angular/Core';

It's lowercase c, not uppercase

import { Component } from '@angular/core';

Laravel csrf token mismatch for ajax POST Request

if you are using jQuery to send AJAX Posts, add this code to all views:

$( document ).on( 'ajaxSend', addLaravelCSRF );

function addLaravelCSRF( event, jqxhr, settings ) {
    jqxhr.setRequestHeader( 'X-XSRF-TOKEN', getCookie( 'XSRF-TOKEN' ) );
}

function getCookie(name) {
    function escape(s) { return s.replace(/([.*+?\^${}()|\[\]\/\\])/g, '\\$1'); };
    var match = document.cookie.match(RegExp('(?:^|;\\s*)' + escape(name) + '=([^;]*)'));
    return match ? match[1] : null;
}

Laravel adds a XSRF cookie to all requests, and we automatically append it to all AJAX requests just before submit.

You may replace getCookie function if there is another function or jQuery plugin to do the same thing.

Find (and kill) process locking port 3000 on Mac

lsof -P | grep ':3000' | awk '{print $2}'

This will give you just the pid, tested on MacOS.

Making a Simple Ajax call to controller in asp.net mvc

Remove the data attribute as you are not POSTING anything to the server (Your controller does not expect any parameters).

And in your AJAX Method you can use Razor and use @Url.Action rather than a static string:

$.ajax({
    url: '@Url.Action("FirstAjax", "AjaxTest")',
    contentType: "application/json; charset=utf-8",
    dataType: "json",
    success: successFunc,
    error: errorFunc
});

From your update:

$.ajax({
    type: "POST",
    url: '@Url.Action("FirstAjax", "AjaxTest")',
    contentType: "application/json; charset=utf-8",
    data: { a: "testing" },
    dataType: "json",
    success: function() { alert('Success'); },
    error: errorFunc
});

Business logic in MVC

A1: Business Logic goes to Model part in MVC. Role of Model is to contain data and business logic. Controller on the other hand is responsible to receive user input and decide what to do.

A2: A Business Rule is part of Business Logic. They have a has a relationship. Business Logic has Business Rules.

Take a look at Wikipedia entry for MVC. Go to Overview where it mentions the flow of MVC pattern.

Also look at Wikipedia entry for Business Logic. It is mentioned that Business Logic is comprised of Business Rules and Workflow.

Difference between Arrays.asList(array) and new ArrayList<Integer>(Arrays.asList(array))

In response to some comments asking questions about the behaviour of Arrays.asList() since Java 8:

    int[] arr1 = {1,2,3};
    /* 
       Arrays are objects in Java, internally int[] will be represented by 
       an Integer Array object which when printed on console shall output
       a pattern such as 
       [I@address for 1-dim int array,
       [[I@address for 2-dim int array, 
       [[F@address for 2-dim float array etc. 
   */
    System.out.println(Arrays.asList(arr1)); 

    /* 
       The line below results in Compile time error as Arrays.asList(int[] array)
       returns List<int[]>. The returned list contains only one element 
       and that is the int[] {1,2,3} 
    */
    // List<Integer> list1 = Arrays.asList(arr1);

    /* 
       Arrays.asList(arr1) is  Arrays$ArrayList object whose only element is int[] array
       so the line below prints [[I@...], where [I@... is the array object.
    */
    System.out.println(Arrays.asList(arr1)); 

    /* 
     This prints [I@..., the actual array object stored as single element 
     in the Arrays$ArrayList object. 
    */
    System.out.println(Arrays.asList(arr1).get(0));

    // prints the contents of array [1,2,3]
    System.out.println(Arrays.toString(Arrays.asList(arr1).get(0)));

    Integer[] arr2 = {1,2,3};
    /* 
     Arrays.asList(arr) is  Arrays$ArrayList object which is 
     a wrapper list object containing three elements 1,2,3.
     Technically, it is pointing to the original Integer[] array 
    */
    List<Integer> list2 = Arrays.asList(arr2);

    // prints the contents of list [1,2,3]
    System.out.println(list2);

How to get full file path from file name?

I know my answer it's too late, but it might helpful to other's
Try,

Void Main()
{
string filename = @"test.txt";
string filePath= AppDomain.CurrentDomain.BaseDirectory + filename ;
Console.WriteLine(filePath);
}

jQuery changing css class to div

$(document).ready(function () {

            $("#divId").toggleClass('cssclassname'); // toggle class
});

**OR**

$(document).ready(function() {
        $("#objectId").click(function() {  // click or other event to change the div class
                $("#divId").toggleClass("cssclassname");     // toggle class
        )}; 
)};

Check if checkbox is NOT checked on click - jQuery

Try this:

if(!$(this).is(':checked'))

demo

Create Setup/MSI installer in Visual Studio 2017

You need to install this extension to Visual Studio 2017/2019 in order to get access to the Installer Projects.

According to the page:

This extension provides the same functionality that currently exists in Visual Studio 2015 for Visual Studio Installer projects. To use this extension, you can either open the Extensions and Updates dialog, select the online node, and search for "Visual Studio Installer Projects Extension," or you can download directly from this page.

Once you have finished installing the extension and restarted Visual Studio, you will be able to open existing Visual Studio Installer projects, or create new ones.

Is it possible to insert HTML content in XML document?

Just put the html tags with there content and add the xmlns attribute with quotes after the equals and in between the quotes is http://www.w3.org/1999/xhtml

text box input height

If you want to increase the height of the input field, you can specify line-height css property for the input field.

input {
    line-height: 2em; // 2em is (2 * default line height)
}

Spring + Web MVC: dispatcher-servlet.xml vs. applicationContext.xml (plus shared security)

<mvc:annotation-driven />
<mvc:default-servlet-handler />
<mvc:resources mapping="/resources/**" location="/resources/" />

<context:component-scan base-package="com.tridenthyundai.ains" />

<bean id="multipartResolver"
    class="org.springframework.web.multipart.commons.CommonsMultipartResolver" />

<bean id="messageSource" 
    class="org.springframework.context.support.ReloadableResourceBundleMessageSource">
    <property name="basename" value="/WEB-INF/messages" />
</bean>

<bean id="viewResolver"
    class="org.springframework.web.servlet.view.InternalResourceViewResolver">

    <property name="prefix">
        <value>/WEB-INF/pages/</value>
    </property>
    <property name="suffix">
        <value>.jsp</value>
    </property>
</bean>

Vertical Alignment of text in a table cell

valign="top" should do the work.

_x000D_
_x000D_
<tr>_x000D_
  <td valign="top">Description</td>_x000D_
</tr>
_x000D_
_x000D_
_x000D_

How to properly add 1 month from now to current date in moment.js

You could try

moment().add(1, 'M').subtract(1, 'day').format('DD-MM-YYYY')

Get root password for Google Cloud Engine VM

I had the same problem. Even after updating the password using sudo passwd it was not working. I had to give "multiple" roles for my user through IAM & Admin Refer Screen Shot on IAM & Admin screen of google cloud

After that i restarted the VM. Then again changed the password and then it worked.

user1@sap-hanaexpress-public-1-vm:~> sudo passwd
New password: 
Retype new password: 
passwd: password updated successfully
user1@sap-hanaexpress-public-1-vm:~> su
Password: 
sap-hanaexpress-public-1-vm:/home/user1 # whoami
root
sap-hanaexpress-public-1-vm:/home/user1 #

How to convert a String to JsonObject using gson library

Note that as of Gson 2.8.6, instance method JsonParser.parse has been deprecated and replaced by static method JsonParser.parseString:

JsonObject jsonObject = JsonParser.parseString(json).getAsJsonObject();

make an html svg object also a clickable link

To accomplish this in all browsers you need to use a combination of @energee, @Richard and @Feuermurmel methods.

<a href="" style="display: block; z-index: 1;">
    <object data="" style="z-index: -1; pointer-events: none;" />
</a>

Adding:

  • pointer-events: none; makes it work in Firefox.
  • display: block; gets it working in Chrome, and Safari.
  • z-index: 1; z-index: -1; makes it work in IE as well.

Check Whether a User Exists

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

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

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

How to programmatically set the SSLContext of a JAX-WS client?

You can move your proxy authentication and ssl staff to soap handler

  port = new SomeService().getServicePort();
  Binding binding = ((BindingProvider) port).getBinding();
  binding.setHandlerChain(Collections.<Handler>singletonList(new ProxyHandler()));

This is my example, do all network ops

  class ProxyHandler implements SOAPHandler<SOAPMessageContext> {
    static class TrustAllHost implements HostnameVerifier {
      public boolean verify(String urlHostName, SSLSession session) {
        return true;
      }
    }

    static class TrustAllCert implements X509TrustManager {
      public java.security.cert.X509Certificate[] getAcceptedIssuers() {
        return null;
      }

      public void checkClientTrusted(java.security.cert.X509Certificate[] certs, String authType) {
      }

      public void checkServerTrusted(java.security.cert.X509Certificate[] certs, String authType) {
      }
    }

    private SSLSocketFactory socketFactory;

    public SSLSocketFactory getSocketFactory() throws Exception {
      // just an example
      if (socketFactory == null) {
        SSLContext sc = SSLContext.getInstance("SSL");
        TrustManager[] trustAllCerts = new TrustManager[] { new TrustAllCert() };
        sc.init(null, trustAllCerts, new java.security.SecureRandom());
        socketFactory = sc.getSocketFactory();
      }

      return socketFactory;
    }

    @Override public boolean handleMessage(SOAPMessageContext msgCtx) {
      if (!Boolean.TRUE.equals(msgCtx.get(MessageContext.MESSAGE_OUTBOUND_PROPERTY)))
        return true;

      HttpURLConnection http = null;

      try {
        SOAPMessage outMessage = msgCtx.getMessage();
        outMessage.setProperty(SOAPMessage.CHARACTER_SET_ENCODING, "UTF-8");
        // outMessage.setProperty(SOAPMessage.WRITE_XML_DECLARATION, true); // Not working. WTF?

        ByteArrayOutputStream message = new ByteArrayOutputStream(2048);
        message.write("<?xml version='1.0' encoding='UTF-8'?>".getBytes("UTF-8"));
        outMessage.writeTo(message);

        String endpoint = (String) msgCtx.get(BindingProvider.ENDPOINT_ADDRESS_PROPERTY);
        URL service = new URL(endpoint);

        Proxy proxy = Proxy.NO_PROXY;
        //Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress("{proxy.url}", {proxy.port}));

        http = (HttpURLConnection) service.openConnection(proxy);
        http.setReadTimeout(60000); // set your timeout
        http.setConnectTimeout(5000);
        http.setUseCaches(false);
        http.setDoInput(true);
        http.setDoOutput(true);
        http.setRequestMethod("POST");
        http.setInstanceFollowRedirects(false);

        if (http instanceof HttpsURLConnection) {
          HttpsURLConnection https = (HttpsURLConnection) http;
          https.setHostnameVerifier(new TrustAllHost());
          https.setSSLSocketFactory(getSocketFactory());
        }

        http.setRequestProperty("Content-Type", "application/soap+xml; charset=utf-8");
        http.setRequestProperty("Content-Length", Integer.toString(message.size()));
        http.setRequestProperty("SOAPAction", "");
        http.setRequestProperty("Host", service.getHost());
        //http.setRequestProperty("Proxy-Authorization", "Basic {proxy_auth}");

        InputStream in = null;
        OutputStream out = null;

        try {
          out = http.getOutputStream();
          message.writeTo(out);
        } finally {
          if (out != null) {
            out.flush();
            out.close();
          }
        }

        int responseCode = http.getResponseCode();
        MimeHeaders responseHeaders = new MimeHeaders();
        message.reset();

        try {
          in = http.getInputStream();
          IOUtils.copy(in, message);
        } catch (final IOException e) {
          try {
            in = http.getErrorStream();
            IOUtils.copy(in, message);
          } catch (IOException e1) {
            throw new RuntimeException("Unable to read error body", e);
          }
        } finally {
          if (in != null)
            in.close();
        }

        for (Map.Entry<String, List<String>> header : http.getHeaderFields().entrySet()) {
          String name = header.getKey();

          if (name != null)
            for (String value : header.getValue())
              responseHeaders.addHeader(name, value);
        }

        SOAPMessage inMessage = MessageFactory.newInstance()
          .createMessage(responseHeaders, new ByteArrayInputStream(message.toByteArray()));

        if (inMessage == null)
          throw new RuntimeException("Unable to read server response code " + responseCode);

        msgCtx.setMessage(inMessage);
        return false;
      } catch (Exception e) {
        throw new RuntimeException("Proxy error", e);
      } finally {
        if (http != null)
          http.disconnect();
      }
    }

    @Override public boolean handleFault(SOAPMessageContext context) {
      return false;
    }

    @Override public void close(MessageContext context) {
    }

    @Override public Set<QName> getHeaders() {
      return Collections.emptySet();
    }
  }

It use UrlConnection, you can use any library you want in handler. Have fun!

store and retrieve a class object in shared preference

You could use GSON, using Gradle Build.gradle :

implementation 'com.google.code.gson:gson:2.8.0'

Then in your code, for example pairs of string/boolean with Kotlin :

        val nestedData = HashMap<String,Boolean>()
        for (i in 0..29) {
            nestedData.put(i.toString(), true)
        }
        val gson = Gson()
        val jsonFromMap = gson.toJson(nestedData)

Adding to SharedPrefs :

        val sharedPrefEditor = context.getSharedPreferences(_prefName, Context.MODE_PRIVATE).edit()
        sharedPrefEditor.putString("sig_types", jsonFromMap)
        sharedPrefEditor.apply()

Now to retrieve data :

val gson = Gson()
val sharedPref: SharedPreferences = context.getSharedPreferences(_prefName, Context.MODE_PRIVATE)
val json = sharedPref.getString("sig_types", "false")
val type = object : TypeToken<Map<String, Boolean>>() {}.type
val map = gson.fromJson(json, type) as LinkedTreeMap<String,Boolean>
for (key in map.keys) {
     Log.i("myvalues", key.toString() + map.get(key).toString())
}

Replace all spaces in a string with '+'

You need to look for some replaceAll option

str = str.replace(/ /g, "+");

this is a regular expression way of doing a replaceAll.

function ReplaceAll(Source, stringToFind, stringToReplace) {
    var temp = Source;
    var index = temp.indexOf(stringToFind);

    while (index != -1) {
        temp = temp.replace(stringToFind, stringToReplace);
        index = temp.indexOf(stringToFind);
    }

    return temp;
}

String.prototype.ReplaceAll = function (stringToFind, stringToReplace) {
    var temp = this;
    var index = temp.indexOf(stringToFind);

    while (index != -1) {
        temp = temp.replace(stringToFind, stringToReplace);
        index = temp.indexOf(stringToFind);
    }

    return temp;

};

How to create json by JavaScript for loop?

If you want a single JavaScript object such as the following:

{ uniqueIDofSelect: "uniqueID", optionValue: "2" }

(where option 2, "Absent", is the current selection) then the following code should produce it:

  var jsObj = null;
  var status = document.getElementsByName("status")[0];
  for (i = 0, i < status.options.length, ++i) {
     if (options[i].selected ) {
        jsObj = { uniqueIDofSelect: status.id, optionValue: options[i].value };
        break;
     }
  }

If you want an array of all such objects (not just the selected one), use michael's code but swap out status.options[i].text for status.id.

If you want a string that contains a JSON representation of the selected object, use this instead:

  var jsonStr = "";
  var status = document.getElementsByName("status")[0];
  for (i = 0, i < status.options.length, ++i) {
     if (options[i].selected ) {
        jsonStr = '{ '
                  + '"uniqueIDofSelect" : '
                  + '"' + status.id + '"'
                  + ", "
                  + '"optionValue" : '
                  + '"'+ options[i].value + '"'
                  + ' }';
        break;
     }
  }

How to initialize a List<T> to a given size (as opposed to capacity)?

Why are you using a List if you want to initialize it with a fixed value ? I can understand that -for the sake of performance- you want to give it an initial capacity, but isn't one of the advantages of a list over a regular array that it can grow when needed ?

When you do this:

List<int> = new List<int>(100);

You create a list whose capacity is 100 integers. This means that your List won't need to 'grow' until you add the 101th item. The underlying array of the list will be initialized with a length of 100.

PHP Array to JSON Array using json_encode();

If you don't specify indexes on your initial array, you get the regular numric ones. Arrays must have some form of unique index

Regular expression that doesn't contain certain string

All you need is a reluctant quantifier:

regex: /aa.*?aa/

aabbabcaabda   => aabbabcaa

aaaaaabda      => aaaa

aabbabcaabda   => aabbabcaa

aababaaaabdaa  => aababaa, aabdaa

You could use negative lookahead, too, but in this case it's just a more verbose way accomplish the same thing. Also, it's a little trickier than gpojd made it out to be. The lookahead has to be applied at each position before the dot is allowed to consume the next character.

/aa(?:(?!aa).)*aa/

As for the approach suggested by Claudiu and finnw, it'll work okay when the sentinel string is only two characters long, but (as Claudiu acknowledged) it's too unwieldy for longer strings.

How to repair a serialized string which has been corrupted by an incorrect byte count length?

Another reason of this problem can be column type of "payload" sessions table. If you have huge data on session, a text column wouldn't be enough. You will need MEDIUMTEXT or even LONGTEXT.

Java 8 forEach with index

There are workarounds but no clean/short/sweet way to do it with streams and to be honest, you would probably be better off with:

int idx = 0;
for (Param p : params) query.bind(idx++, p);

Or the older style:

for (int idx = 0; idx < params.size(); idx++) query.bind(idx, params.get(idx));

Java: Convert String to TimeStamp

DateFormat formatter;
formatter = new SimpleDateFormat("dd/MM/yyyy");
Date date = (Date) formatter.parse(str_date);
java.sql.Timestamp timeStampDate = new Timestamp(date.getTime());

How to display a confirmation dialog when clicking an <a> link?

USING PHP, HTML AND JAVASCRIPT for prompting

Just if someone looking for using php, html and javascript in a single file, the answer below is working for me.. i attached with the used of bootstrap icon "trash" for the link.

<a class="btn btn-danger" href="<?php echo "delete.php?&var=$var"; ?>" onclick="return confirm('Are you sure want to delete this?');"><span class="glyphicon glyphicon-trash"></span></a>

the reason i used php code in the middle is because i cant use it from the beginning..

the code below doesnt work for me:-

echo "<a class='btn btn-danger' href='delete.php?&var=$var' onclick='return confirm('Are you sure want to delete this?');'><span class='glyphicon glyphicon-trash'></span></a>";

and i modified it as in the 1st code then i run as just what i need.. I hope that can i can help someone inneed of my case.

How to force addition instead of concatenation in javascript

The following statement appends the value to the element with the id of response

$('#response').append(total);

This makes it look like you are concatenating the strings, but you aren't, you're actually appending them to the element

change that to

$('#response').text(total);

You need to change the drop event so that it replaces the value of the element with the total, you also need to keep track of what the total is, I suggest something like the following

$(function() {
    var data = [];
    var total = 0;

    $( "#draggable1" ).draggable();
    $( "#draggable2" ).draggable();
    $( "#draggable3" ).draggable();

    $("#droppable_box").droppable({
        drop: function(event, ui) {
        var currentId = $(ui.draggable).attr('id');
        data.push($(ui.draggable).attr('id'));

        if(currentId == "draggable1"){
            var myInt1 = parseFloat($('#MealplanCalsPerServing1').val());
        }
        if(currentId == "draggable2"){
            var myInt2 = parseFloat($('#MealplanCalsPerServing2').val());
        }
        if(currentId == "draggable3"){
            var myInt3 = parseFloat($('#MealplanCalsPerServing3').val());
        }
        if ( typeof myInt1 === 'undefined' || !myInt1 ) {
            myInt1 = parseInt(0);
        }
        if ( typeof myInt2 === 'undefined' || !myInt2){
            myInt2 = parseInt(0);
        }
        if ( typeof myInt3 === 'undefined' || !myInt3){
        myInt3 = parseInt(0);
        }
        total += parseFloat(myInt1 + myInt2 + myInt3);
        $('#response').text(total);
        }
    });

    $('#myId').click(function(event) {
        $.post("process.php", ({ id: data }), function(return_data, status) {
            alert(data);
            //alert(total);
        });
    });
});

I moved the var total = 0; statement out of the drop event and changed the assignment statment from this

total = parseFloat(myInt1 + myInt2 + myInt3);

to this

total += parseFloat(myInt1 + myInt2 + myInt3);

Here is a working example http://jsfiddle.net/axrwkr/RCzGn/

Pass a datetime from javascript to c# (Controller)

The following format should work:

$.ajax({
    type: "POST",
    url: "@Url.Action("refresh", "group")",
    contentType: "application/json; charset=utf-8",
    data: JSON.stringify({ 
        myDate: '2011-04-02 17:15:45'
    }),
    success: function (result) {
        //do something
    },
    error: function (req, status, error) {
        //error                        
    }
});

Func delegate with no return type

... takes no arguments and has a void return type?

If you are writing for System.Windows.Forms, You can also use:

public delegate void MethodInvoker()

Origin <origin> is not allowed by Access-Control-Allow-Origin

Add this to your NodeJS Server below imports:

app.use(function(req, res, next) {
  res.header("Access-Control-Allow-Origin", "*");
  res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
  next();
});

Facebook API - How do I get a Facebook user's profile image through the Facebook API (without requiring the user to "Allow" the application)

To show:

50x50 pixels

<img src="//graph.facebook.com/{{fid}}/picture">

200 pixels width

<img src="//graph.facebook.com/{{fid}}/picture?type=large">

To save (using PHP)

NOTE: Don't use this. See @Foreever's comment below.

$img = file_get_contents('https://graph.facebook.com/'.$fid.'/picture?type=large');
$file = dirname(__file__).'/avatar/'.$fid.'.jpg';
file_put_contents($file, $img);

Where $fid is your user id on Facebook.

NOTE: In case of images marked as "18+" you will need a valid access_token from a 18+ user:

<img src="//graph.facebook.com/{{fid}}/picture?access_token={{access_token}}">

UPDATE 2015:

Graph API v2.0 can't be queried using usernames, you should use userId always.

How do I finish the merge after resolving my merge conflicts?

It may be late. It is Happen because your git HEAD is not updated. this commend would solve that git reset HEAD.

How to remove all numbers from string?

Use some regex like [0-9] or \d:

$words = preg_replace('/\d+/', '', $words );

You might want to read the preg_replace() documentation as this is directly shown there.

Why doesn't calling a Python string method do anything unless you assign its output?

Example for String Methods

Given a list of filenames, we want to rename all the files with extension hpp to the extension h. To do this, we would like to generate a new list called newfilenames, consisting of the new filenames. Fill in the blanks in the code using any of the methods you’ve learned thus far, like a for loop or a list comprehension.

filenames = ["program.c", "stdio.hpp", "sample.hpp", "a.out", "math.hpp", "hpp.out"]
# Generate newfilenames as a list containing the new filenames
# using as many lines of code as your chosen method requires.
newfilenames = []
for i in filenames:
    if i.endswith(".hpp"):
        x = i.replace("hpp", "h")
        newfilenames.append(x)
    else:
        newfilenames.append(i)


print(newfilenames)
# Should be ["program.c", "stdio.h", "sample.h", "a.out", "math.h", "hpp.out"]

Best way to store data locally in .NET (C#)

I recommend XML reader/writer class for files because it is easily serialized.

Serialization in C#

Serialization (known as pickling in python) is an easy way to convert an object to a binary representation that can then be e.g. written to disk or sent over a wire.

It's useful e.g. for easy saving of settings to a file.

You can serialize your own classes if you mark them with [Serializable] attribute. This serializes all members of a class, except those marked as [NonSerialized].

The following is code to show you how to do this:

using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;


namespace ConfigTest
{ [ Serializable() ]

    public class ConfigManager
    {
        private string windowTitle = "Corp";
        private string printTitle = "Inventory";

        public string WindowTitle
        {
            get
            {
                return windowTitle;
            }
            set
            {
                windowTitle = value;
            }
        }

        public string PrintTitle
        {
            get
            {
                return printTitle;
            }
            set
            {
                printTitle = value;
            }
        }
    }
}

You then, in maybe a ConfigForm, call your ConfigManager class and Serialize it!

public ConfigForm()
{
    InitializeComponent();
    cm = new ConfigManager();
    ser = new XmlSerializer(typeof(ConfigManager));
    LoadConfig();
}

private void LoadConfig()
{     
    try
    {
        if (File.Exists(filepath))
        {
            FileStream fs = new FileStream(filepath, FileMode.Open);
            cm = (ConfigManager)ser.Deserialize(fs);
            fs.Close();
        } 
        else
        {
            MessageBox.Show("Could not find User Configuration File\n\nCreating new file...", "User Config Not Found");
            FileStream fs = new FileStream(filepath, FileMode.CreateNew);
            TextWriter tw = new StreamWriter(fs);
            ser.Serialize(tw, cm);
            tw.Close();
            fs.Close();
        }    
        setupControlsFromConfig();
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message);
    }
}

After it has been serialized, you can then call the parameters of your config file using cm.WindowTitle, etc.

How can I add "href" attribute to a link dynamically using JavaScript?

First, try changing <a>Link</a> to <span id=test><a>Link</a></span>.

Then, add something like this in the javascript function that you're calling:

var abc = 'somelink';
document.getElementById('test').innerHTML = '<a href="' + abc + '">Link</a>';

This way the link will look like this:

<a href="somelink">Link</a>

Write to UTF-8 file in Python

@S-Lott gives the right procedure, but expanding on the Unicode issues, the Python interpreter can provide more insights.

Jon Skeet is right (unusual) about the codecs module - it contains byte strings:

>>> import codecs
>>> codecs.BOM
'\xff\xfe'
>>> codecs.BOM_UTF8
'\xef\xbb\xbf'
>>> 

Picking another nit, the BOM has a standard Unicode name, and it can be entered as:

>>> bom= u"\N{ZERO WIDTH NO-BREAK SPACE}"
>>> bom
u'\ufeff'

It is also accessible via unicodedata:

>>> import unicodedata
>>> unicodedata.lookup('ZERO WIDTH NO-BREAK SPACE')
u'\ufeff'
>>> 

In Oracle, is it possible to INSERT or UPDATE a record through a view?

Oracle has two different ways of making views updatable:-

  1. The view is "key preserved" with respect to what you are trying to update. This means the primary key of the underlying table is in the view and the row appears only once in the view. This means Oracle can figure out exactly which underlying table row to update OR
  2. You write an instead of trigger.

I would stay away from instead-of triggers and get your code to update the underlying tables directly rather than through the view.

How to simulate a click with JavaScript?

Here's what I cooked up. It's pretty simple, but it works:

function eventFire(el, etype){
  if (el.fireEvent) {
    el.fireEvent('on' + etype);
  } else {
    var evObj = document.createEvent('Events');
    evObj.initEvent(etype, true, false);
    el.dispatchEvent(evObj);
  }
}

Usage:

eventFire(document.getElementById('mytest1'), 'click');

How to add directory to classpath in an application run profile in IntelliJ IDEA?

Suppose you need only x:target/classes in your classpath. Then you just add this folder to your classpath and %IDEA%\lib\idea_rt.jar. Now it will work. That's it.

List files ONLY in the current directory

You can use os.listdir for this purpose. If you only want files and not directories, you can filter the results using os.path.isfile.

example:

files = os.listdir(os.curdir)  #files and directories

or

files = filter(os.path.isfile, os.listdir( os.curdir ) )  # files only
files = [ f for f in os.listdir( os.curdir ) if os.path.isfile(f) ] #list comprehension version.

Add borders to cells in POI generated Excel File

If you're using the org.apache.poi.ss.usermodel (not HSSF or XSSF) you can use:

style.setBorderBottom(BorderStyle.THIN);
style.setBorderTop(BorderStyle.THIN);
style.setBorderLeft(BorderStyle.THIN);
style.setBorderRight(BorderStyle.THIN);

all the border styles are here at the apache documentation

Visual Studio error "Object reference not set to an instance of an object" after install of ASP.NET and Web Tools 2015

Maybe this helps:

  1. Delete the contents from the following folders:
    1. C:\Users\%userprofile%\AppData\Local\Microsoft\VisualStudio
    2. C:\Users\%userprofile%\AppData\Local\Microsoft\VSCommon
  2. Sometimes, you need to go to:
    1. [x64] C:\Program Files (x86)\Microsoft Visual Studio 14.0\Common7\IDE
    2. [x86] C:\Program Files\Microsoft Visual Studio 14.0\Common7\IDE

and run devenv /resetuserdata.

Expect, that all of your user settings such as Visual Studio layout, linked Microsoft account or start page might disappear.

Reverse of JSON.stringify?

You need to JSON.parse() the string.

_x000D_
_x000D_
var str = '{"hello":"world"}';
try {
  var obj = JSON.parse(str); // this is how you parse a string into JSON 
  document.body.innerHTML += obj.hello;
} catch (ex) {
  console.error(ex);
}
_x000D_
_x000D_
_x000D_

Python: Tuples/dictionaries as keys, select, sort

A dictionary probably isn't what you should be using in this case. A more full featured library would be a better alternative. Probably a real database. The easiest would be sqlite. You can keep the whole thing in memory by passing in the string ':memory:' instead of a filename.

If you do want to continue down this path, you can do it with the extra attributes in the key or the value. However a dictionary can't be the key to a another dictionary, but a tuple can. The docs explain what's allowable. It must be an immutable object, which includes strings, numbers and tuples that contain only strings and numbers (and more tuples containing only those types recursively...).

You could do your first example with d = {('apple', 'red') : 4}, but it'll be very hard to query for what you want. You'd need to do something like this:

#find all apples
apples = [d[key] for key in d.keys() if key[0] == 'apple']

#find all red items
red = [d[key] for key in d.keys() if key[1] == 'red']

#the red apple
redapples = d[('apple', 'red')]

PL/SQL ORA-01422: exact fetch returns more than requested number of rows

It can also be due to a duplicate entry in any of the tables that are used.

Difference between <input type='button' /> and <input type='submit' />

<input type="button" /> buttons will not submit a form - they don't do anything by default. They're generally used in conjunction with JavaScript as part of an AJAX application.

<input type="submit"> buttons will submit the form they are in when the user clicks on them, unless you specify otherwise with JavaScript.

PHP if not statements

For future reference, you can quickly create a truth table to check if it evaluates the way you want... it's kind of like Sudoku.

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

Example:

column 1 is issetaction, column 2 and 3 evaluates !="add","delete" respectively

if($a=add) T && (F && T) => T && F => FALSE

if($a=delete) T && (T && F) => T && F => FALSE

if($a=nothing) T && (T && T) => T && T => TRUE

Spring CrudRepository findByInventoryIds(List<Long> inventoryIdList) - equivalent to IN clause

Yes, that is supported.

Check the documentation provided here for the supported keywords inside method names.

You can just define the method in the repository interface without using the @Query annotation and writing your custom query. In your case it would be as followed:

List<Inventory> findByIdIn(List<Long> ids);

I assume that you have the Inventory entity and the InventoryRepository interface. The code in your case should look like this:

The Entity

@Entity
public class Inventory implements Serializable {

  private static final long serialVersionUID = 1L;

  private Long id;

  // other fields
  // getters/setters

}

The Repository

@Repository
@Transactional
public interface InventoryRepository extends PagingAndSortingRepository<Inventory, Long> {

  List<Inventory> findByIdIn(List<Long> ids);

}

Print values for multiple variables on the same line from within a for-loop

As an additional note, there is no need for the for loop because of R's vectorization.

This:

P <- 243.51
t <- 31 / 365
n <- 365

for (r in seq(0.15, 0.22, by = 0.01))    
     A <- P * ((1 + (r/ n))^ (n * t))
     interest <- A - P
}

is equivalent to:

P <- 243.51
t <- 31 / 365
n <- 365
r <- seq(0.15, 0.22, by = 0.01)
A <- P * ((1 + (r/ n))^ (n * t))
interest <- A - P

Because r is a vector, the expression above containing it is performed for all values of the vector.

What is the printf format specifier for bool?

You can't, but you can print 0 or 1

_Bool b = 1;
printf("%d\n", b);

source

Press TAB and then ENTER key in Selenium WebDriver

In python this work for me

self.set_your_value = "your value"

def your_method_name(self):      
    self.driver.find_element_by_name(self.set_your_value).send_keys(Keys.TAB)`

Importing images from a directory (Python) to list or dictionary

from PIL import Image
import os, os.path

imgs = []
path = "/home/tony/pictures"
valid_images = [".jpg",".gif",".png",".tga"]
for f in os.listdir(path):
    ext = os.path.splitext(f)[1]
    if ext.lower() not in valid_images:
        continue
    imgs.append(Image.open(os.path.join(path,f)))
   

Python list directory, subdirectory, and files

Use os.path.join to concatenate the directory and file name:

for path, subdirs, files in os.walk(root):
    for name in files:
        print(os.path.join(path, name))

Note the usage of path and not root in the concatenation, since using root would be incorrect.


In Python 3.4, the pathlib module was added for easier path manipulations. So the equivalent to os.path.join would be:

pathlib.PurePath(path, name)

The advantage of pathlib is that you can use a variety of useful methods on paths. If you use the concrete Path variant you can also do actual OS calls through them, like changing into a directory, deleting the path, opening the file it points to and much more.

How can I find script's directory?

import os
exec_filepath = os.path.realpath(__file__)
exec_dirpath = exec_filepath[0:len(exec_filepath)-len(os.path.basename(__file__))]

How do I create a Python function with optional arguments?

Try calling it like: obj.some_function( '1', 2, '3', g="foo", h="bar" ). After the required positional arguments, you can specify specific optional arguments by name.

Simple DateTime sql query

You can execute below code

SELECT Time FROM [TableName] where DATEPART(YYYY,[Time])='2018' and DATEPART(MM,[Time])='06' and DATEPART(DD,[Time])='14

How to open a specific port such as 9090 in Google Compute Engine

I had the same problem as you do and I could solve it by following @CarlosRojas instructions with a little difference. Instead of create a new firewall rule I edited the default-allow-internal one to accept traffic from anywhere since creating new rules didn't make any difference.

Query based on multiple where clauses in Firebase

I've written a personal library that allows you to order by multiple values, with all the ordering done on the server.

Meet Querybase!

Querybase takes in a Firebase Database Reference and an array of fields you wish to index on. When you create new records it will automatically handle the generation of keys that allow for multiple querying. The caveat is that it only supports straight equivalence (no less than or greater than).

const databaseRef = firebase.database().ref().child('people');
const querybaseRef = querybase.ref(databaseRef, ['name', 'age', 'location']);

// Automatically handles composite keys
querybaseRef.push({ 
  name: 'David',
  age: 27,
  location: 'SF'
});

// Find records by multiple fields
// returns a Firebase Database ref
const queriedDbRef = querybaseRef
 .where({
   name: 'David',
   age: 27
 });

// Listen for realtime updates
queriedDbRef.on('value', snap => console.log(snap));

How do I uniquely identify computers visiting my web site?

The suggestions to use cookies aside, the only comprehensive set of identifying attributes available to interrogate are contained in the HTTP request header. So it is possible to use some subset of these to create a pseudo-unique identifier for a user agent (i.e., browser). Further, most of this information is possibly already being logged in the so-called "access log" of your web server software by default and, if not, can be easily configured to do so. Then, a utlity could be developed that simply scans the content of this log, creating fingerprints of each request comprised of, say, the IP address and User Agent string, etc. The more data available, even including the contents of specific cookies, adds to the quality of the uniqueness of this fingerprint. Though, as many others have stated already, the HTTP protocol doesn't make this 100% foolproof - at best it can only be a fairly good indicator.

How do I use Maven through a proxy?

Those are caused most likely by 2 issues:

  1. You need to add proxy configuration to your settings.xml. Here's a trick in your username field. Make sure it looks like domain\username. Setting domain there and putting this exact slash is important '\'. You might want to use <![CDATA[]]> tag if your password contains non xml-friendly characters.
  2. I've noticed maven 2.2.0 does not work sometimes through a proxy at all, where 2.2.1 works perfectly fine.

If some of those are omitted - maven could fail with random error messages.

Just hope I've saved somebody from googling around this issue for 6 hours, like I did.

How to set radio button checked as default in radiogroup?

In case for xml attribute its android:checkedButton which takes the id of the RadioButton to be checked.

<RadioGroup
...
...
android:checkedButton="@+id/IdOfTheRadioButtonInsideThatTobeChecked"
... >....</RadioGroup>

PermissionError: [WinError 5] Access is denied python using moviepy to write gif

Sometimes it occurs when some installations are not completed correctly, the process is stuck, or a file is still opened. So, when you try to run the installation again and the installation requires deleting, you can see the aforementioned error. In my case, shutting down the python processes and command prompt utilization helped.

Horizontal line using HTML/CSS

This might be your problem:

height: .05em;

Chrome is a bit funky with decimals, so try a fixed-pixel height:

height: 2px;

sql use statement with variable

Use exec sp_execsql @Sql

Example

DECLARE @sql as nvarchar(100)  
DECLARE @paraDOB datetime  
SET @paraDOB = '1/1/1981'  
SET @sql=N'SELECT * FROM EmpMast WHERE DOB >= @paraDOB'  
exec sp_executesql @sql,N'@paraDOB datetime',@paraDOB

How to export and import environment variables in windows?

Here is my PowerShell method

gci env:* | sort-object name | Where-Object {$_.Name -like "MyApp*"} | Foreach {"[System.Environment]::SetEnvironmentVariable('$($_.Name)', '$($_.Value)', 'Machine')"}

What it does

  1. Scoops up all environment variables
  2. Filters them
  3. Emits the formatted PowerShell needed to recreate them on another machine (assumes all are set at machine level)

So after running this on the source machine, simply transfer output onto the target machine and execute (elevated prompt if setting at machine level)

Reading numbers from a text file into an array in C

change to

fscanf(myFile, "%1d", &numberArray[i]);

Expression must be a modifiable L-value

lvalue means "left value" -- it should be assignable. You cannot change the value of text since it is an array, not a pointer.

Either declare it as char pointer (in this case it's better to declare it as const char*):

const char *text;
if(number == 2) 
    text = "awesome"; 
else 
    text = "you fail";

Or use strcpy:

char text[60];
if(number == 2) 
    strcpy(text, "awesome"); 
else 
    strcpy(text, "you fail");

Reload a DIV without reloading the whole page

try this

<script type="text/javascript">
window.onload = function(){


var auto_refresh = setInterval(
function ()
{
$('.View').html('');
$('.View').load('Small.php').fadeIn("slow");
}, 15000); // refresh every 15000 milliseconds

}
</script>

msvcr110.dll is missing from computer error while installing PHP

I am on a 64 bit system, and I only got this to work after installing both the 32 and 64 bit versions of the redistributable. I did not try the 64 bit version by itself due to the other posters' warnings about using the 32 bit version (and am too lazy to uninstall the 32 bit version now that I have it working), so I don't know if the 32 bit version is needed or not in cases like mine.

Confusing "duplicate identifier" Typescript error message

I ran into a similar problem. Simply moving my tsconfig.json from the root of my project up to a different scope helped. In my project, I moved tsconfig.json from the root up to wwwroot.

Batch file to map a drive when the folder name contains spaces

net use "m:\Server01\my folder" /USER:mynetwork\Administrator "Mypassword" /persistent:yes 

does not work?

Find Nth occurrence of a character in a string

if your interested you can also create string extension methods like so:

     public static int Search(this string yourString, string yourMarker, int yourInst = 1, bool caseSensitive = true)
    {
        //returns the placement of a string in another string
        int num = 0;
        int currentInst = 0;
        //if optional argument, case sensitive is false convert string and marker to lowercase
        if (!caseSensitive) { yourString = yourString.ToLower(); yourMarker = yourMarker.ToLower(); }
        int myReturnValue = -1; //if nothing is found the returned integer is negative 1
        while ((num + yourMarker.Length) <= yourString.Length)
        {
            string testString = yourString.Substring(num, yourMarker.Length);

            if (testString == yourMarker)
            {
                currentInst++;
                if (currentInst == yourInst)
                {
                    myReturnValue = num;
                    break;
                }
            }
            num++;
        }           
       return myReturnValue;
    }

   public static int Search(this string yourString, char yourMarker, int yourInst = 1, bool caseSensitive = true)
    {
        //returns the placement of a string in another string
        int num = 0;
        int currentInst = 0;
        var charArray = yourString.ToArray<char>();
        int myReturnValue = -1;
        if (!caseSensitive)
        {
            yourString = yourString.ToLower();
            yourMarker = Char.ToLower(yourMarker);
        }
        while (num <= charArray.Length)
        {                
            if (charArray[num] == yourMarker)
            {
                currentInst++;
                if (currentInst == yourInst)
                {
                    myReturnValue = num;
                    break;
                }
            }
            num++;
        }
        return myReturnValue;
    }

How can I plot data with confidence intervals?

Here is part of my program related to plotting confidence interval.

1. Generate the test data

ads = 1
require(stats); require(graphics)
library(splines)
x_raw <- seq(1,10,0.1)
y <- cos(x_raw)+rnorm(len_data,0,0.1)
y[30] <- 1.4 # outlier point
len_data = length(x_raw)
N <- len_data
summary(fm1 <- lm(y~bs(x_raw, df=5), model = TRUE, x =T, y = T))
ht <-seq(1,10,length.out = len_data)
plot(x = x_raw, y = y,type = 'p')
y_e <- predict(fm1, data.frame(height = ht))
lines(x= ht, y = y_e)

Result

enter image description here

2. Fitting the raw data using B-spline smoother method

sigma_e <- sqrt(sum((y-y_e)^2)/N)
print(sigma_e)
H<-fm1$x
A <-solve(t(H) %*% H)
y_e_minus <- rep(0,N)
y_e_plus <- rep(0,N)
y_e_minus[N]
for (i in 1:N)
{
    tmp <-t(matrix(H[i,])) %*% A %*% matrix(H[i,])
    tmp <- 1.96*sqrt(tmp)
    y_e_minus[i] <- y_e[i] - tmp
    y_e_plus[i] <- y_e[i] + tmp
}
plot(x = x_raw, y = y,type = 'p')
polygon(c(ht,rev(ht)),c(y_e_minus,rev(y_e_plus)),col = rgb(1, 0, 0,0.5), border = NA)
#plot(x = x_raw, y = y,type = 'p')
lines(x= ht, y = y_e_plus, lty = 'dashed', col = 'red')
lines(x= ht, y = y_e)
lines(x= ht, y = y_e_minus, lty = 'dashed', col = 'red')

Result

enter image description here

JavaScript hashmap equivalent

Hash your objects yourself manually, and use the resulting strings as keys for a regular JavaScript dictionary. After all, you are in the best position to know what makes your objects unique. That's what I do.

Example:

var key = function(obj){
  // Some unique object-dependent key
  return obj.totallyUniqueEmployeeIdKey; // Just an example
};

var dict = {};

dict[key(obj1)] = obj1;
dict[key(obj2)] = obj2;

This way you can control indexing done by JavaScript without heavy lifting of memory allocation, and overflow handling.

Of course, if you truly want the "industrial-grade solution", you can build a class parameterized by the key function, and with all the necessary API of the container, but … we use JavaScript, and trying to be simple and lightweight, so this functional solution is simple and fast.

The key function can be as simple as selecting right attributes of the object, e.g., a key, or a set of keys, which are already unique, a combination of keys, which are unique together, or as complex as using some cryptographic hashes like in DojoX encoding, or DojoX UUID. While the latter solutions may produce unique keys, personally I try to avoid them at all costs, especially, if I know what makes my objects unique.

Update in 2014: Answered back in 2008 this simple solution still requires more explanations. Let me clarify the idea in a Q&A form.

Your solution doesn't have a real hash. Where is it???

JavaScript is a high-level language. Its basic primitive (Object) includes a hash table to keep properties. This hash table is usually written in a low-level language for efficiency. Using a simple object with string keys we use an efficiently implemented hash table without any efforts on our part.

How do you know they use a hash?

There are three major ways to keep a collection of objects addressable by a key:

  • Unordered. In this case to retrieve an object by its key we have to go over all keys stopping when we find it. On average it will take n/2 comparisons.
  • Ordered.
    • Example #1: a sorted array — doing a binary search we will find our key after ~log2(n) comparisons on average. Much better.
    • Example #2: a tree. Again it'll be ~log(n) attempts.
  • Hash table. On average, it requires a constant time. Compare: O(n) vs. O(log n) vs. O(1). Boom.

Obviously JavaScript objects use hash tables in some form to handle general cases.

Do browser vendors really use hash tables???

Really.

Do they handle collisions?

Yes. See above. If you found a collision on unequal strings, please do not hesitate to file a bug with a vendor.

So what is your idea?

If you want to hash an object, find what makes it unique and use it as a key. Do not try to calculate a real hash or emulate hash tables — it is already efficiently handled by the underlying JavaScript object.

Use this key with JavaScript's Object to leverage its built-in hash table while steering clear of possible clashes with default properties.

Examples to get you started:

  • If your objects include a unique user name — use it as a key.
  • If it includes a unique customer number — use it as a key.
    • If it includes unique government-issued numbers like US SSNs, or a passport number, and your system doesn't allow duplicates — use it as a key.
  • If a combination of fields is unique — use it as a key.
    • US state abbreviation + driver license number makes an excellent key.
    • Country abbreviation + passport number is an excellent key too.
  • Some function on fields, or a whole object, can return a unique value — use it as a key.

I used your suggestion and cached all objects using a user name. But some wise guy is named "toString", which is a built-in property! What should I do now?

Obviously, if it is even remotely possible that the resulting key will exclusively consists of Latin characters, you should do something about it. For example, add any non-Latin Unicode character you like at the beginning or at the end to un-clash with default properties: "#toString", "#MarySmith". If a composite key is used, separate key components using some kind of non-Latin delimiter: "name,city,state".

In general, this is the place where we have to be creative and select the easiest keys with given limitations (uniqueness, potential clashes with default properties).

Note: unique keys do not clash by definition, while potential hash clashes will be handled by the underlying Object.

Why don't you like industrial solutions?

IMHO, the best code is no code at all: it has no errors, requires no maintenance, easy to understand, and executes instantaneously. All "hash tables in JavaScript" I saw were >100 lines of code, and involved multiple objects. Compare it with: dict[key] = value.

Another point: is it even possible to beat a performance of a primordial object written in a low-level language, using JavaScript and the very same primordial objects to implement what is already implemented?

I still want to hash my objects without any keys!

We are in luck: ECMAScript 6 (released in June 2015) defines map and set.

Judging by the definition, they can use an object's address as a key, which makes objects instantly distinct without artificial keys. OTOH, two different, yet identical objects, will be mapped as distinct.

Comparison breakdown from MDN:

Objects are similar to Maps in that both let you set keys to values, retrieve those values, delete keys, and detect whether something is stored at a key. Because of this (and because there were no built-in alternatives), Objects have been used as Maps historically; however, there are important differences that make using a Map preferable in certain cases:

  • The keys of an Object are Strings and Symbols, whereas they can be any value for a Map, including functions, objects, and any primitive.
  • The keys in Map are ordered while keys added to object are not. Thus, when iterating over it, a Map object returns keys in order of insertion.
  • You can get the size of a Map easily with the size property, while the number of properties in an Object must be determined manually.
  • A Map is an iterable and can thus be directly iterated, whereas iterating over an Object requires obtaining its keys in some fashion and iterating over them.
  • An Object has a prototype, so there are default keys in the map that could collide with your keys if you're not careful. As of ES5 this can be bypassed by using map = Object.create(null), but this is seldom done.
  • A Map may perform better in scenarios involving frequent addition and removal of key pairs.

How can I use mySQL replace() to replace strings in multiple records?

This will help you.

UPDATE play_school_data SET title= REPLACE(title, "&#39;", "'") WHERE title = "Elmer&#39;s Parade";

Result:

title = Elmer's Parade

How to include js and CSS in JSP with spring MVC

you need declare resources in dispatcher servelet file.below is two declarations

<mvc:annotation-driven />
<mvc:resources location="/resources/" mapping="/resources/**" />

Send a file via HTTP POST with C#

Using .NET 4.5 (or .NET 4.0 by adding the Microsoft.Net.Http package from NuGet) there is an easier way to simulate form requests. Here is an example:

private async Task<System.IO.Stream> Upload(string actionUrl, string paramString, Stream paramFileStream, byte [] paramFileBytes)
{
    HttpContent stringContent = new StringContent(paramString);
    HttpContent fileStreamContent = new StreamContent(paramFileStream);
    HttpContent bytesContent = new ByteArrayContent(paramFileBytes);
    using (var client = new HttpClient())
    using (var formData = new MultipartFormDataContent())
    {
        formData.Add(stringContent, "param1", "param1");
        formData.Add(fileStreamContent, "file1", "file1");
        formData.Add(bytesContent, "file2", "file2");
        var response = await client.PostAsync(actionUrl, formData);
        if (!response.IsSuccessStatusCode)
        {
            return null;
        }
        return await response.Content.ReadAsStreamAsync();
    }
}

checking if number entered is a digit in jquery

With jQuery's validation plugin you could do something like this, assuming that the form is called form and the value to validate is called nrInput

$("form").validate({
            errorElement: "div",
            errorClass: "error-highlight",
            onblur: true,
            onsubmit: true,
            focusInvalid: true,
            rules:{
                'nrInput': {
                    number: true,
                    required: true
                }
            });

This also handles decimal values.

Fastest way to list all primes below N

This is the way you can compare with others.

# You have to list primes upto n
nums = xrange(2, n)
for i in range(2, 10):
    nums = filter(lambda s: s==i or s%i, nums)
print nums

So simple...

Add floating point value to android resources/values

If you have simple floats that you control the range of, you can also have an integer in the resources and divide by the number of decimal places you need straight in code.

So something like this

<integer name="strokeWidth">356</integer>

is used with 2 decimal places

this.strokeWidthFromResources = resources_.getInteger(R.integer.strokeWidth);    
circleOptions.strokeWidth((float) strokeWidthFromResources/ 100);

and that makes it 3.56f

Not saying this is the most elegant solution but for simple projects, it's convenient.

Prevent HTML5 video from being downloaded (right-click saved)?

@Clayton-Graul had what I was looking for, except I needed the CoffeeScript version for a site using AngularJS. Just in case you need that too, here's what you put in the AngularJS controller in question:

    # This is how to we do JQuery ready() dom stuff
    $ ->
        # let's hide those annoying download video options.
        # of course anyone who knows how can still download
        # the video, but hey... more power to 'em.
        $('#my-video').bind 'contextmenu', -> 
            false

"strange things are afoot at the circle k" (it's true)

Remove part of string after "."

You just need to escape the period:

a <- c("NM_020506.1","NM_020519.1","NM_001030297.2","NM_010281.2","NM_011419.3", "NM_053155.2")

gsub("\\..*","",a)
[1] "NM_020506"    "NM_020519"    "NM_001030297" "NM_010281"    "NM_011419"    "NM_053155" 

How to use XPath in Python?

You can use:

PyXML:

from xml.dom.ext.reader import Sax2
from xml import xpath
doc = Sax2.FromXmlFile('foo.xml').documentElement
for url in xpath.Evaluate('//@Url', doc):
  print url.value

libxml2:

import libxml2
doc = libxml2.parseFile('foo.xml')
for url in doc.xpathEval('//@Url'):
  print url.content

Javascript : array.length returns undefined

Objects don't have a .length property.

A simple solution if you know you don't have to worry about hasOwnProperty checks, would be to do this:

Object.keys(data).length;

If you have to support IE 8 or lower, you'll have to use a loop, instead:

var length= 0;
for(var key in data) {
    if(data.hasOwnProperty(key)){
        length++;
    }
}

What is the effect of encoding an image in base64?

Here's a really helpful overview of when to base64 encode and when not to by David Calhoun.

Basic answer = gzipped base64 encoded files will be roughly comparable in file size to standard binary (jpg/png). Gzip'd binary files will have a smaller file size.

Takeaway = There's some advantage to encoding and gzipping your UI icons, etc, but unwise to do this for larger images.

How do I download a package from apt-get without installing it?

Don't forget the option "-o", which lets you download anywhere you want, although you have to create "archives", "lock" and "partial" first (the command prints what's needed).

apt-get install -d -o=dir::cache=/tmp whateveryouwant

Static way to get 'Context' in Android?

According to this source you can obtain your own Context by extending ContextWrapper

public class SomeClass extends ContextWrapper {

    public SomeClass(Context base) {
      super(base);
    }

    public void someMethod() {
        // notice how I can use "this" for Context
        // this works because this class has it's own Context just like an Activity or Service
        startActivity(this, SomeRealActivity.class);

        //would require context too
        File cacheDir = getCacheDir();
    }
}

JavaDoc for ContextWrapper

Proxying implementation of Context that simply delegates all of its calls to another Context. Can be subclassed to modify behavior without changing the original Context.

log4j:WARN No appenders could be found for logger in web.xml

In my case the solution was easy. You don't need to declare anything in your web.xml.

Because your project is a web application, the config file should be on WEB-INF/classes after deployment. I advise you to create a Java resource folder (src/main/resources) to do that (best pratice). Another approach is to put the config file in your src/main/java.

Beware with the configuration file name. If you are using XML, the file name is log4j.xml, otherwise log4j.properties.

Loading an image to a <img> from <input file>

_x000D_
_x000D_
$('document').ready(function () {
    $("#imgload").change(function () {
        if (this.files && this.files[0]) {
            var reader = new FileReader();
            reader.onload = function (e) {
                $('#imgshow').attr('src', e.target.result);
            }
            reader.readAsDataURL(this.files[0]);
        }
    });
});
_x000D_
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="file" id="imgload" >
<img src="#" id="imgshow" align="left">
_x000D_
_x000D_
_x000D_

That works for me in jQuery.

concatenate char array in C

in rare cases when you can't use strncat, strcat or strcpy. And you don't have access to <string.h> so you can't use strlen. Also you maybe don't even know the size of the char arrays and you still want to concatenate because you got only pointers. Well, you can do old school malloc and count characters yourself like..

char *combineStrings(char* inputA, char* inputB) {
    size_t len = 0, lenB = 0;
    while(inputA[len] != '\0') len++;
    while(inputB[lenB] != '\0') lenB++;
    char* output = malloc(len+lenB);
    sprintf((char*)output,"%s%s",inputA,inputB);
    return output;
}

It just needs #include <stdio.h> which you will have most likely included already

Can not get a simple bootstrap modal to work

Also,

If you're running your page from Visual Studio and have installed the bootstrap package you need to make sure of two things

  1. That you've also gotten the Bootsrap Modal Dialog package (very important)
  2. You've added it to bundle.config if you're using bundling.

How to Get a Specific Column Value from a DataTable?

As per the title of the post I just needed to get all values from a specific column. Here is the code I used to achieve that.

    public static IEnumerable<T> ColumnValues<T>(this DataColumn self)
    {
        return self.Table.Select().Select(dr => (T)Convert.ChangeType(dr[self], typeof(T)));
    }

When is it acceptable to call GC.Collect?

The short answer is: never!

document.getElementById().value doesn't set the value

The only case I could imagine is, that you run this on a webkit browser like Chrome or Safari and your return value in responseText, contains a string value.

In that constelation, the value cannot be displayed (it would get blank)

Example: http://jsfiddle.net/BmhNL/2/


My point here is, that I expect a wrong/double encoded string value. Webkit browsers are more strict on the type = number. If there is "only" a white-space issue, you can try to implicitly call the Number() constructor, like

document.getElementById("points").value = +request.responseText;

Does C have a string type?

There is no string type in C. You have to use char arrays.

By the way your code will not work ,because the size of the array should allow for the whole array to fit in plus one additional zero terminating character.

ORA-01861: literal does not match format string

Just before executing the query: alter session set NLS_DATE_FORMAT = "DD.MM.YYYY HH24:MI:SS"; or whichever format you are giving the information to the date function. This should fix the ORA error

Update query with PDO and MySQL

Your update syntax is incorrect. Please check Update Syntax for the correct syntax.

$sql = "UPDATE `access_users` set `contact_first_name` = :firstname,  `contact_surname` = :surname, `contact_email` = :email, `telephone` = :telephone";

Creating a simple login form

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
   <head>
      <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
      <title>Login Page</title>
      <style>
         /* Basics */
         html, body {
         width: 100%;
         height: 100%;
         font-family: "Helvetica Neue", Helvetica, sans-serif;
         color: #444;
         -webkit-font-smoothing: antialiased;
         background: #f0f0f0;
         }
         #container {
         position: fixed;
         width: 340px;
         height: 280px;
         top: 50%;
         left: 50%;
         margin-top: -140px;
         margin-left: -170px;
         background: #fff;
         border-radius: 3px;
         border: 1px solid #ccc;
         box-shadow: 0 1px 2px rgba(0, 0, 0, .1);
         }
         form {
         margin: 0 auto;
         margin-top: 20px;
         }
         label {
         color: #555;
         display: inline-block;
         margin-left: 18px;
         padding-top: 10px;
         font-size: 14px;
         }
         p a {
         font-size: 11px;
         color: #aaa;
         float: right;
         margin-top: -13px;
         margin-right: 20px;
         -webkit-transition: all .4s ease;
         -moz-transition: all .4s ease;
         transition: all .4s ease;
         }
         p a:hover {
         color: #555;
         }
         input {
         font-family: "Helvetica Neue", Helvetica, sans-serif;
         font-size: 12px;
         outline: none;
         }
         input[type=text],
         input[type=password] ,input[type=time]{
         color: #777;
         padding-left: 10px;
         margin: 10px;
         margin-top: 12px;
         margin-left: 18px;
         width: 290px;
         height: 35px;
         border: 1px solid #c7d0d2;
         border-radius: 2px;
         box-shadow: inset 0 1.5px 3px rgba(190, 190, 190, .4), 0 0 0 5px #f5f7f8;
         -webkit-transition: all .4s ease;
         -moz-transition: all .4s ease;
         transition: all .4s ease;
         }
         input[type=text]:hover,
         input[type=password]:hover,input[type=time]:hover {
         border: 1px solid #b6bfc0;
         box-shadow: inset 0 1.5px 3px rgba(190, 190, 190, .7), 0 0 0 5px #f5f7f8;
         }
         input[type=text]:focus,
         input[type=password]:focus,input[type=time]:focus {
         border: 1px solid #a8c9e4;
         box-shadow: inset 0 1.5px 3px rgba(190, 190, 190, .4), 0 0 0 5px #e6f2f9;
         }
         #lower {
         background: #ecf2f5;
         width: 100%;
         height: 69px;
         margin-top: 20px;
         box-shadow: inset 0 1px 1px #fff;
         border-top: 1px solid #ccc;
         border-bottom-right-radius: 3px;
         border-bottom-left-radius: 3px;
         }
         input[type=checkbox] {
         margin-left: 20px;
         margin-top: 30px;
         }
         .check {
         margin-left: 3px;
         font-size: 11px;
         color: #444;
         text-shadow: 0 1px 0 #fff;
         }
         input[type=submit] {
         float: right;
         margin-right: 20px;
         margin-top: 20px;
         width: 80px;
         height: 30px;
         font-size: 14px;
         font-weight: bold;
         color: #fff;
         background-color: #acd6ef; /*IE fallback*/
         background-image: -webkit-gradient(linear, left top, left bottom, from(#acd6ef), to(#6ec2e8));
         background-image: -moz-linear-gradient(top left 90deg, #acd6ef 0%, #6ec2e8 100%);
         background-image: linear-gradient(top left 90deg, #acd6ef 0%, #6ec2e8 100%);
         border-radius: 30px;
         border: 1px solid #66add6;
         box-shadow: 0 1px 2px rgba(0, 0, 0, .3), inset 0 1px 0 rgba(255, 255, 255, .5);
         cursor: pointer;
         }
         input[type=submit]:hover {
         background-image: -webkit-gradient(linear, left top, left bottom, from(#b6e2ff), to(#6ec2e8));
         background-image: -moz-linear-gradient(top left 90deg, #b6e2ff 0%, #6ec2e8 100%);
         background-image: linear-gradient(top left 90deg, #b6e2ff 0%, #6ec2e8 100%);
         }
         input[type=submit]:active {
         background-image: -webkit-gradient(linear, left top, left bottom, from(#6ec2e8), to(#b6e2ff));
         background-image: -moz-linear-gradient(top left 90deg, #6ec2e8 0%, #b6e2ff 100%);
         background-image: linear-gradient(top left 90deg, #6ec2e8 0%, #b6e2ff 100%);
         }
      </style>
   </head>
   <body>
      <!-- Begin Page Content -->
      <div id="container">
         <form action="login_process.php" method="post">
            <label for="loginmsg" style="color:hsla(0,100%,50%,0.5); font-family:"Helvetica Neue",Helvetica,sans-serif;"><?php  echo @$_GET['msg'];?></label>
            <label for="username">Username:</label>
            <input type="text" id="username" name="username">
            <label for="password">Password:</label>
            <input type="password" id="password" name="password">
            <div id="lower">
               <input type="checkbox"><label class="check" for="checkbox">Keep me logged in</label>
               <input type="submit" value="Login">
            </div>
            <!--/ lower-->
         </form>
      </div>
      <!--/ container-->
      <!-- End Page Content -->
   </body>
</html>

Getting "The remote certificate is invalid according to the validation procedure" when SMTP server has a valid certificate

The answer I have finally found is that the SMTP service on the server is not using the same certificate as https.

The diagnostic steps I had read here make the assumption they use the same certificate and every time I've tried this in the past they have done and the diagnostic steps are exactly what I've done to solve the problem several times.

In this case those steps didn't work because the certificates in use were different, and the possibility of this is something I had never come across.

The solution is either to export the actual certificate from the server and then install it as a trusted certificate on my machine, or to get a different valid/trusted certificate for the SMTP service on the server. That is currently with our IT department who administer the servers to decide which they want to do.

How to generate javadoc comments in Android Studio

Here is an example of a JavaDoc comment from Oracle:

/**
 * Returns an Image object that can then be painted on the screen. 
 * The url argument must specify an absolute {@link URL}. The name
 * argument is a specifier that is relative to the url argument. 
 * <p>
 * This method always returns immediately, whether or not the 
 * image exists. When this applet attempts to draw the image on
 * the screen, the data will be loaded. The graphics primitives 
 * that draw the image will incrementally paint on the screen. 
 *
 * @param  url  an absolute URL giving the base location of the image
 * @param  name the location of the image, relative to the url argument
 * @return      the image at the specified URL
 * @see         Image
 */
 public Image getImage(URL url, String name) {
        try {
            return getImage(new URL(url, name));
        } catch (MalformedURLException e) {
            return null;
        }
 }

The basic format can be auto generated in either of the following ways:

  • Position the cursor above the method and type /** + Enter
  • Position the cursor on the method name and press Alt + Enter > click Add JavaDoc enter image description here

How to get jQuery dropdown value onchange event

If you have simple dropdown like:

<select name="status" id="status">
    <option value="1">Active</option>
    <option value="0">Inactive</option>
</select>

Then you can use this code for getting value:

$(function(){

 $("#status").change(function(){
     var status = this.value;
     alert(status);
   if(status=="1")
     $("#icon_class, #background_class").hide();// hide multiple sections
  });

});

Cannot start MongoDB as a service

make sure to open the command line with "run as administrator" rights in the right click before typing the entire mongod things

PHP Session timeout

<?php 
session_start();

if (time()<$_SESSION['time']+10){
$_SESSION['time'] = time();
echo "welcome old user";
}

else{
session_destroy();
session_start();
$_SESSION['time'] = time();
echo "welcome new user";
}
?>

Given a view, how do I get its viewController?

To get reference to UIViewController having UIView, you could make extension of UIResponder (which is super class for UIView and UIViewController), which allows to go up through the responder chain and thus reaching UIViewController (otherwise returning nil).

extension UIResponder {
    func getParentViewController() -> UIViewController? {
        if self.nextResponder() is UIViewController {
            return self.nextResponder() as? UIViewController
        } else {
            if self.nextResponder() != nil {
                return (self.nextResponder()!).getParentViewController()
            }
            else {return nil}
        }
    }
}

//Swift 3
extension UIResponder {
    func getParentViewController() -> UIViewController? {
        if self.next is UIViewController {
            return self.next as? UIViewController
        } else {
            if self.next != nil {
                return (self.next!).getParentViewController()
            }
            else {return nil}
        }
    }
}

let vc = UIViewController()
let view = UIView()
vc.view.addSubview(view)
view.getParentViewController() //provide reference to vc

Is it ok to scrape data from Google results?

Google thrives on scraping websites of the world...so if it was "so illegal" then even Google won't survive ..of course other answers mention ways of mitigating IP blocks by Google. One more way to explore avoiding captcha could be scraping at random times (dint try) ..Moreover, I have a feeling, that if we provide novelty or some significant processing of data then it sounds fine at least to me...if we are simply copying a website.. or hampering its business/brand in some way...then it is bad and should be avoided..on top of it all...if you are a startup then no one will fight you as there is no benefit.. but if your entire premise is on scraping even when you are funded then you should think of more sophisticated ways...alternative APIs..eventually..Also Google keeps releasing (or depricating) fields for its API so what you want to scrap now may be in roadmap of new Google API releases..

Appending an id to a list if not already present in a string

7 years later, allow me to give a one-liner solution by building on a previous answer. You could do the followwing:

numbers = [1, 2, 3]

to Add [3, 4, 5] into numbers without repeating 3, do the following:

numbers = list(set(numbers + [3, 4, 5]))

This results in 4 and 5 being added to numbers as in [1, 2, 3, 4, 5]

Explanation:

Now let me explain what happens, starting from the inside of the set() instruction, we took numbers and added 3, 4, and 5 to it which makes numbers look like [1, 2, 3, 3, 4, 5]. Then, we took that ([1, 2, 3, 3, 4, 5]) and transformed it into a set which gets rid of duplicates, resulting in the following {1, 2, 3, 4, 5}. Now since we wanted a list and not a set, we used the function list() to make that set ({1, 2, 3, 4, 5}) into a list, resulting in [1, 2, 3, 4, 5] which we assigned to the variable numbers

This, I believe, will work for all types of data in a list, and objects as well if done correctly.

Simple way to convert datarow array to datatable

DataTable dataTable = new DataTable();
dataTable = OldDataTable.Tables[0].Clone();
foreach(DataRow dr in RowData.Tables[0].Rows)
{
 DataRow AddNewRow = dataTable.AddNewRow();
 AddNewRow.ItemArray = dr.ItemArray;
 dataTable.Rows.Add(AddNewRow);
}

Return a "NULL" object if search result not found

If you want a NULL return value you need to use pointers instead of references.

References can't themselves be NULL.

(Note to the future comment posters: Yes you can have the address of a reference be NULL if you really really try to).

See my answer here for a list of differences between references and pointers.

Disable future dates in jQuery UI Datepicker

Yes, datepicker supports max date property.

 $("#datepickeraddcustomer").datepicker({  
             dateFormat: "yy-mm-dd",  
             maxDate: new Date()  
        });

Ruby on Rails generates model field:type - what are the options for field:type?

There are lots of data types you can mention while creating model, some examples are:

:primary_key, :string, :text, :integer, :float, :decimal, :datetime, :timestamp, :time, :date, :binary, :boolean, :references

syntax:

field_type:data_type

CURL to access a page that requires a login from a different page

My answer is a mod of some prior answers from @JoeMills and @user.

  1. Get a cURL command to log into server:

    • Load login page for website and open Network pane of Developer Tools
      • In firefox, right click page, choose 'Inspect Element (Q)' and click on Network tab
    • Go to login form, enter username, password and log in
    • After you have logged in, go back to Network pane and scroll to the top to find the POST entry. Right click and choose Copy -> Copy as CURL
    • Paste this to a text editor and try this in command prompt to see if it works
      • Its possible that some sites have hardening that will block this type of login spoofing that would require more steps below to bypass.
  2. Modify cURL command to be able to save session cookie after login

    • Remove the entry -H 'Cookie: <somestuff>'
    • Add after curl at beginning -c login_cookie.txt
    • Try running this updated curl command and you should get a new file 'login_cookie.txt' in the same folder
  3. Call a new web page using this new cookie that requires you to be logged in

    • curl -b login_cookie.txt <url_that_requires_log_in>

I have tried this on Ubuntu 20.04 and it works like a charm.

Disabled form inputs do not appear in the request

I find this works easier. readonly the input field, then style it so the end user knows it's read only. inputs placed here (from AJAX for example) can still submit, without extra code.

<input readonly style="color: Grey; opacity: 1; ">

How to delete row based on cell value

The easiest way to do this would be to use a filter.

You can either filter for any cells in column A that don't have a "-" and copy / paste, or (my more preferred method) filter for all cells that do have a "-" and then select all and delete - Once you remove the filter, you're left with what you need.

Hope this helps.

How do I get the SQLSRV extension to work with PHP, since MSSQL is deprecated?

Download Microsoft Drivers for PHP for SQL Server. Extract the files and use one of:

File                             Thread Safe         VC Bulid
php_sqlsrv_53_nts_vc6.dll           No                  VC6
php_sqlsrv_53_nts_vc9.dll           No                  VC9
php_sqlsrv_53_ts_vc6.dll            Yes                 VC6
php_sqlsrv_53_ts_vc9.dll            Yes                 VC9

You can see the Thread Safety status in phpinfo().

Add the correct file to your ext directory and the following line to your php.ini:

extension=php_sqlsrv_53_*_vc*.dll

Use the filename of the file you used.

As Gordon already posted this is the new Extension from Microsoft and uses the sqlsrv_* API instead of mssql_*

Update:
On Linux you do not have the requisite drivers and neither the SQLSERV Extension.
Look at Connect to MS SQL Server from PHP on Linux? for a discussion on this.

In short you need to install FreeTDS and YES you need to use mssql_* functions on linux. see update 2

To simplify things in the long run I would recommend creating a wrapper class with requisite functions which use the appropriate API (sqlsrv_* or mssql_*) based on which extension is loaded.

Update 2: You do not need to use mssql_* functions on linux. You can connect to an ms sql server using PDO + ODBC + FreeTDS. On windows, the best performing method to connect is via PDO + ODBC + SQL Native Client since the PDO + SQLSRV driver can be incredibly slow.

How do you append to a file?

You can also do it with print instead of write:

with open('test.txt', 'a') as f:
    print('appended text', file=f)

If test.txt doesn't exist, it will be created...

What are Keycloak's OAuth2 / OpenID Connect endpoints?

Following link Provides JSON document describing metadata about the Keycloak

/auth/realms/{realm-name}/.well-known/openid-configuration

Following information reported with Keycloak 6.0.1 for master realm

{  
   "issuer":"http://localhost:8080/auth/realms/master",
   "authorization_endpoint":"http://localhost:8080/auth/realms/master/protocol/openid-connect/auth",
   "token_endpoint":"http://localhost:8080/auth/realms/master/protocol/openid-connect/token",
   "token_introspection_endpoint":"http://localhost:8080/auth/realms/master/protocol/openid-connect/token/introspect",
   "userinfo_endpoint":"http://localhost:8080/auth/realms/master/protocol/openid-connect/userinfo",
   "end_session_endpoint":"http://localhost:8080/auth/realms/master/protocol/openid-connect/logout",
   "jwks_uri":"http://localhost:8080/auth/realms/master/protocol/openid-connect/certs",
   "check_session_iframe":"http://localhost:8080/auth/realms/master/protocol/openid-connect/login-status-iframe.html",
   "grant_types_supported":[  
      "authorization_code",
      "implicit",
      "refresh_token",
      "password",
      "client_credentials"
   ],
   "response_types_supported":[  
      "code",
      "none",
      "id_token",
      "token",
      "id_token token",
      "code id_token",
      "code token",
      "code id_token token"
   ],
   "subject_types_supported":[  
      "public",
      "pairwise"
   ],
   "id_token_signing_alg_values_supported":[  
      "PS384",
      "ES384",
      "RS384",
      "HS256",
      "HS512",
      "ES256",
      "RS256",
      "HS384",
      "ES512",
      "PS256",
      "PS512",
      "RS512"
   ],
   "userinfo_signing_alg_values_supported":[  
      "PS384",
      "ES384",
      "RS384",
      "HS256",
      "HS512",
      "ES256",
      "RS256",
      "HS384",
      "ES512",
      "PS256",
      "PS512",
      "RS512",
      "none"
   ],
   "request_object_signing_alg_values_supported":[  
      "PS384",
      "ES384",
      "RS384",
      "ES256",
      "RS256",
      "ES512",
      "PS256",
      "PS512",
      "RS512",
      "none"
   ],
   "response_modes_supported":[  
      "query",
      "fragment",
      "form_post"
   ],
   "registration_endpoint":"http://localhost:8080/auth/realms/master/clients-registrations/openid-connect",
   "token_endpoint_auth_methods_supported":[  
      "private_key_jwt",
      "client_secret_basic",
      "client_secret_post",
      "client_secret_jwt"
   ],
   "token_endpoint_auth_signing_alg_values_supported":[  
      "RS256"
   ],
   "claims_supported":[  
      "aud",
      "sub",
      "iss",
      "auth_time",
      "name",
      "given_name",
      "family_name",
      "preferred_username",
      "email"
   ],
   "claim_types_supported":[  
      "normal"
   ],
   "claims_parameter_supported":false,
   "scopes_supported":[  
      "openid",
      "address",
      "email",
      "microprofile-jwt",
      "offline_access",
      "phone",
      "profile",
      "roles",
      "web-origins"
   ],
   "request_parameter_supported":true,
   "request_uri_parameter_supported":true,
   "code_challenge_methods_supported":[  
      "plain",
      "S256"
   ],
   "tls_client_certificate_bound_access_tokens":true,
   "introspection_endpoint":"http://localhost:8080/auth/realms/master/protocol/openid-connect/token/introspect"
}

Checking if a variable is initialized

By default, no you can't know if a variable (or pointer) has or hasn't been initialized. However, since everyone else is telling you the "easy" or "normal" approach, I'll give you something else to think about. Here's how you could keep track of something like that (no, I personally would never do this, but perhaps you have different needs than me).

class MyVeryCoolInteger
{
public:
    MyVeryCoolInteger() : m_initialized(false) {}

    MyVeryCoolInteger& operator=(const int integer)
    {
        m_initialized = true;
        m_int = integer;
        return *this;
    }

    int value()
    {
        return m_int;
    }

    bool isInitialized()
    {
        return m_initialized;
    }

private:
    int m_int;
    bool m_initialized;
};

How to integrate Dart into a Rails app

If you run pub build --mode=debug the build directory contains the application without symlinks. The Dart code should be retained when --mode=debug is used.

Here is some discussion going on about this topic too Dart and it's place in Rails Assets Pipeline

Can CSS force a line break after each word in an element?

Try using white-space: pre-line;. It creates a line-break wherever a line-break appears in the code, but ignores the extra whitespace (tabs and spaces etc.).

First, write your words on separate lines in your code:

<div>Short
Word</div>

Then apply the style to the element containing the words.

div { white-space: pre-line; }

Be careful though, every line break in the code inside the element will create a line break. So writing the following will result in an extra line break before the first word and after the last word:

<div>
    Short
    Word
</div>

There's a great article on CSS Tricks explaining the other white-space attributes.

calling java methods in javascript code

Java is a server side language, whereas javascript is a client side language. Both cannot communicate. If you have setup some server side script using Java you could use AJAX on the client in order to send an asynchronous request to it and thus invoke any possible Java functions. For example if you use jQuery as js framework you may take a look at the $.ajax() method. Or if you wanted to do it using plain javascript, here's a tutorial.

Jackson how to transform JsonNode to ArrayNode without casting?

Yes, the Jackson manual parser design is quite different from other libraries. In particular, you will notice that JsonNode has most of the functions that you would typically associate with array nodes from other API's. As such, you do not need to cast to an ArrayNode to use. Here's an example:

JSON:

{
    "objects" : ["One", "Two", "Three"]
}

Code:

final String json = "{\"objects\" : [\"One\", \"Two\", \"Three\"]}";

final JsonNode arrNode = new ObjectMapper().readTree(json).get("objects");
if (arrNode.isArray()) {
    for (final JsonNode objNode : arrNode) {
        System.out.println(objNode);
    }
}

Output:

"One"
"Two"
"Three"

Note the use of isArray to verify that the node is actually an array before iterating. The check is not necessary if you are absolutely confident in your datas structure, but its available should you need it (and this is no different from most other JSON libraries).

Get decimal portion of a number with JavaScript

n = Math.floor(x);
remainder = x % 1;

select from one table, insert into another table oracle sql query

You will get useful information from here.

SELECT ticker
INTO quotedb
FROM tickerdb;

How to change JFrame icon

Unfortunately, the above solution did not work for Jython Fiji plugin. I had to use getProperty to construct the relative path dynamically.

Here's what worked for me:

import java.lang.System.getProperty;
import javax.swing.JFrame;
import javax.swing.ImageIcon;

frame = JFrame("Test")
icon = ImageIcon(getProperty('fiji.dir') + '/path/relative2Fiji/icon.png')
frame.setIconImage(icon.getImage());
frame.setVisible(True)

Toolbar overlapping below status bar

Just set this to v21/styles.xml file

 <item name="android:windowDrawsSystemBarBackgrounds">true</item>
 <item name="android:statusBarColor">@color/colorPrimaryDark</item>

and be sure

 <item name="android:windowTranslucentStatus">false</item>

How can I wait for a thread to finish with .NET?

Add

t1.Join();    // Wait until thread t1 finishes

after you start it, but that won't accomplish much as it's essentialy the same result as running on the main thread!

I can highly recommended reading Joe Albahari's Threading in C# free e-book, if you want to gain an understanding of threading in .NET.

Oracle PL/SQL - How to create a simple array variable?

You could just declare a DBMS_SQL.VARCHAR2_TABLE to hold an in-memory variable length array indexed by a BINARY_INTEGER:

DECLARE
   name_array dbms_sql.varchar2_table;
BEGIN
   name_array(1) := 'Tim';
   name_array(2) := 'Daisy';
   name_array(3) := 'Mike';
   name_array(4) := 'Marsha';
   --
   FOR i IN name_array.FIRST .. name_array.LAST
   LOOP
      -- Do something
   END LOOP;
END;

You could use an associative array (used to be called PL/SQL tables) as they are an in-memory array.

DECLARE
   TYPE employee_arraytype IS TABLE OF employee%ROWTYPE
        INDEX BY PLS_INTEGER;
   employee_array employee_arraytype;
BEGIN
   SELECT *
     BULK COLLECT INTO employee_array
     FROM employee
    WHERE department = 10;
   --
   FOR i IN employee_array.FIRST .. employee_array.LAST
   LOOP
      -- Do something
   END LOOP;
END;

The associative array can hold any make up of record types.

Hope it helps, Ollie.

Hide horizontal scrollbar on an iframe?

If you are allowed to change the code of the document inside your iframe and that content is visible only using its parent window, simply add the following CSS in your iframe:

body {
    overflow:hidden;
}

Here a very simple example:

http://jsfiddle.net/u5gLoav9/

This solution allow you to:

  • Keep you HTML5 valid as it does not need scrolling="no" attribute on the iframe (this attribute in HTML5 has been deprecated).

  • Works on the majority of browsers using CSS overflow:hidden

  • No JS or jQuery necessary.

Notes:

To disallow scroll-bars horizontally, use this CSS instead:

overflow-x: hidden;

How to listen state changes in react.js?

It's been a while but for future reference: the method shouldComponentUpdate() can be used.

An update can be caused by changes to props or state. These methods are called in the following order when a component is being re-rendered:

static getDerivedStateFromProps() 
shouldComponentUpdate() 
render()
getSnapshotBeforeUpdate() 
componentDidUpdate()

ref: https://reactjs.org/docs/react-component.html

How to list all the files in android phone by using adb shell?

just to add the full command:

adb shell ls -R | grep filename

this is actually a pretty fast lookup on Android

How to use auto-layout to move other views when a view is hidden?

For the Googlers: building on Max's answer, to solve the padding issue that many have noticed I simply increased the height of the label and used that height as the separator instead of actual padding. This idea could be expanded for any scenario with containing views.

Here's a simple example:

IB Screenshot

In this case, I map the height of the Author label to an appropriate IBOutlet:

@property (retain, nonatomic) IBOutlet NSLayoutConstraint* authorLabelHeight;

and when I set the height of the constraint to 0.0f, we preserve the "padding", because the Play button's height allows for it.

"Register" an .exe so you can run it from any command line in Windows

The best way to do this is just install the .EXE file into the windows/system32 folder. that way you can run it from any location. This is the same place where .exe's like ping can be found

How to replace existing value of ArrayList element in Java

Use the set method to replace the old value with a new one.

list.set( 2, "New" );

MySQL - how to front pad zip code with "0"?

Store your zipcodes as CHAR(5) instead of a numeric type, or have your application pad it with zeroes when you load it from the DB. A way to do it with PHP using sprintf():

echo sprintf("%05d", 205); // prints 00205
echo sprintf("%05d", 1492); // prints 01492

Or you could have MySQL pad it for you with LPAD():

SELECT LPAD(zip, 5, '0') as zipcode FROM table;

Here's a way to update and pad all rows:

ALTER TABLE `table` CHANGE `zip` `zip` CHAR(5); #changes type
UPDATE table SET `zip`=LPAD(`zip`, 5, '0'); #pads everything

What online brokers offer APIs?

As of this posting it looks like TradeKing is working on an API. Not sure what the future of it is though.

Perl: Use s/ (replace) and return new string

If you have Perl 5.14 or greater, you can use the /r option with the substitution operator to perform non-destructive substitution:

print "bla: ", $myvar =~ s/a/b/r, "\n";

In earlier versions you can achieve the same using a do() block with a temporary lexical variable, e.g.:

print "bla: ", do { (my $tmp = $myvar) =~ s/a/b/; $tmp }, "\n";

unique() for more than one variable

How about using unique() itself?

df <- data.frame(yad = c("BARBIE", "BARBIE", "BAKUGAN", "BAKUGAN"),
                 per = c("AYLIK",  "AYLIK",  "2 AYLIK", "2 AYLIK"),
                 hmm = 1:4)

df
#       yad     per hmm
# 1  BARBIE   AYLIK   1
# 2  BARBIE   AYLIK   2
# 3 BAKUGAN 2 AYLIK   3
# 4 BAKUGAN 2 AYLIK   4

unique(df[c("yad", "per")])
#       yad     per
# 1  BARBIE   AYLIK
# 3 BAKUGAN 2 AYLIK

Does Java have an exponential operator?

To do this with user input:

public static void getPow(){
    Scanner sc = new Scanner(System.in);
    System.out.println("Enter first integer: ");    // 3
    int first = sc.nextInt();
    System.out.println("Enter second integer: ");    // 2
    int second = sc.nextInt();
    System.out.println(first + " to the power of " + second + " is " + 
        (int) Math.pow(first, second));    // outputs 9

Can I apply multiple background colors with CSS3?

You can only use one color but as many images as you want, here is the format:

background: [ <bg-layer> , ]* <final-bg-layer>

<bg-layer> = <bg-image> || <bg-position> [ / <bg-size> ]? || <repeat-style> || <attachment> || <box>{1,2}

<final-bg-layer> = <bg-image> || <bg-position> [ / <bg-size> ]? || <repeat-style> || <attachment> || <box>{1,2} || <background-color>

or background: url(image1.png) center bottom no-repeat, url(image2.png) left top no-repeat;

If you need more colors, make an image of a solid color and use it. I know it’s not what you want to hear, but I hope it helps.

The format is from http://www.css3.info/preview/multiple-backgrounds/

Using reCAPTCHA on localhost

As of January 2nd, 2021, Google posted these two keys for testing in this article.

I'd like to run automated tests with reCAPTCHA. What should I do? For reCAPTCHA v3, create a separate key for testing environments. Scores may not be accurate as reCAPTCHA v3 relies on seeing real traffic.

For reCAPTCHA v2, use the following test keys. You will always get No CAPTCHA and all verification requests will pass.

Site key: 6LeIxAcTAAAAAJcZVRqyHh71UMIEGNQ_MXjiZKhI
Secret key: 6LeIxAcTAAAAAGG-vFI1TnRWxMZNFuojJ4WifJWe

The reCAPTCHA widget will show a warning message to ensure it's not used for production traffic.

The generated emails went into spam the first time I used the keys.

Bootstrap 3 Styled Select dropdown looks ugly in Firefox on OS X

Actualy you can do almost everything with dropdown field, and it will looks the same on every browser, take a look at code example

select.custom {
  background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg%20version%3D%221.1%22%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20xmlns%3Axlink%3D%22http%3A%2F%2Fwww.w3.org%2F1999%2Fxlink%22%20x%3D%220px%22%20y%3D%220px%22%20fill%3D%22%23555555%22%20%0A%09%20width%3D%2224px%22%20height%3D%2224px%22%20viewBox%3D%22-261%20145.2%2024%2024%22%20style%3D%22enable-background%3Anew%20-261%20145.2%2024%2024%3B%22%20xml%3Aspace%3D%22preserve%22%3E%0A%3Cpath%20d%3D%22M-245.3%2C156.1l-3.6-6.5l-3.7%2C6.5%20M-252.7%2C159l3.7%2C6.5l3.6-6.5%22%2F%3E%0A%3C%2Fsvg%3E");
  padding-right: 25px;
  background-repeat: no-repeat;
  background-position: right center;
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
}

select.custom::-ms-expand {
  display: none;
}

https://jsfiddle.net/x76j455z/10/

How to know user has clicked "X" or the "Close" button?

How to detect if the form closed by click on X button or by calling Close() in code?

You cannot rely on close reason of the form closing event args, because if the user click X button on title bar or close the form using Alt + F4 or use system menu to close the form or the form get closed by calling Close() method, all all above cases, the close reason will be Closed by User which is not desired result.

To distinguish if the form closed by X button or by Close method, you can use either of the following options:

  • Handle WM_SYSCOMMAND and check for SC_CLOSE and set a flag.
  • Check the StackTrace to see if any of the frames contain Close method call.

Example 1 - Handle WM_SYSCOMMAND

public bool ClosedByXButtonOrAltF4 {get; private set;}
private const int SC_CLOSE = 0xF060;
private const int WM_SYSCOMMAND = 0x0112;
protected override void WndProc(ref Message msg)
{
    if (msg.Msg == WM_SYSCOMMAND && msg.WParam.ToInt32() == SC_CLOSE)
        ClosedByXButtonOrAltF4 = true;
    base.WndProc(ref msg);
}
protected override void OnShown(EventArgs e)
{
    ClosedByXButtonOrAltF4 = false;
}   
protected override void OnFormClosing(FormClosingEventArgs e)
{
    if (ClosedByXButtonOrAltF4)
        MessageBox.Show("Closed by X or Alt+F4");
    else
        MessageBox.Show("Closed by calling Close()");
}

Example 2 - Checking StackTrace

protected override void OnFormClosing(FormClosingEventArgs e)
{
    if (new StackTrace().GetFrames().Any(x => x.GetMethod().Name == "Close"))
        MessageBox.Show("Closed by calling Close()");
    else
        MessageBox.Show("Closed by X or Alt+F4");
}

HTML tag <a> want to add both href and onclick working

You already have what you need, with a minor syntax change:

<a href="www.mysite.com" onclick="return theFunction();">Item</a>

<script type="text/javascript">
    function theFunction () {
        // return true or false, depending on whether you want to allow the `href` property to follow through or not
    }
</script>

The default behavior of the <a> tag's onclick and href properties is to execute the onclick, then follow the href as long as the onclick doesn't return false, canceling the event (or the event hasn't been prevented)

how to hide a vertical scroll bar when not needed

Add this class in .css class

.scrol  { 
font: bold 14px Arial; 
border:1px solid black; 
width:100% ; 
color:#616D7E; 
height:20px; 
overflow:scroll; 
overflow-y:scroll;
overflow-x:hidden;
}

and use the class in div. like here.

<div> <p class = "scrol" id = "title">-</p></div>

I have attached image , you see the out put of the above code enter image description here

"Stack overflow in line 0" on Internet Explorer

I don't know what to tell you, but the same problem occured with jQuery table sorting and SEARCH. When there is nothing left in the table, where you are searching a string for example, you get this error too. Even in Google Analytics this error occurs often.

How to update a pull request from forked repo?

Updating a pull request in GitHub is as easy as committing the wanted changes into existing branch (that was used with pull request), but often it is also wanted to squash the changes into single commit:

git checkout yourbranch
git rebase -i origin/master

# Edit command names accordingly
  pick   1fc6c95 My pull request
  squash 6b2481b Hack hack - will be discarded
  squash dd1475d Also discarded

git push -f origin yourbranch

...and now the pull request contains only one commit.


Related links about rebasing:

CSS Disabled scrolling

I use iFrame to insert the content from another page and CSS mentioned above is NOT working as expected. I have to use the parameter scrolling="no" even if I use HTML 5 Doctype

Is there an easy way to add a border to the top and bottom of an Android View?

So I wanted to do something slightly different: a border on the bottom ONLY, to simulate a ListView divider. I modified Piet Delport's answer and got this:

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
   <item>
      <shape 
        android:shape="rectangle">
            <solid android:color="@color/background_trans_light" />    

        </shape>
   </item>

    <!-- this mess is what we have to do to get a bottom border only. -->
   <item android:top="-2dp"
         android:left="-2dp"
         android:right="-2dp"
         android:bottom="1px"> 
      <shape 
        android:shape="rectangle">    
            <stroke android:width="1dp" android:color="@color/background_trans_mid" />
            <solid android:color="@null" />
        </shape>
   </item>

</layer-list>

Note using px instead of dp to get exactly 1 pixel divider (some phone DPIs will make a 1dp line disappear).

How can I escape double quotes in XML attributes values?

A double quote character (") can be escaped as &quot;, but here's the rest of the story...

Double quote character must be escaped in this context:

  • In XML attributes delimited by double quotes:

    <EscapeNeeded name="Pete &quot;Maverick&quot; Mitchell"/>
    

Double quote character need not be escaped in most contexts:

  • In XML textual content:

    <NoEscapeNeeded>He said, "Don't quote me."</NoEscapeNeeded>
    
  • In XML attributes delimited by single quotes ('):

    <NoEscapeNeeded name='Pete "Maverick" Mitchell'/>
    

    Similarly, (') require no escaping if (") are used for the attribute value delimiters:

    <NoEscapeNeeded name="Pete 'Maverick' Mitchell"/>
    

See also

SQL Query to fetch data from the last 30 days?

select status, timeplaced 
from orders 
where TIMEPLACED>'2017-06-12 00:00:00' 

REST vs JSON-RPC?

Wrong question: imposes a manichean that not exist!

You can use JSON-RPC with "less verb" (no method) and preserve the minimal standardization necessary for sendo id, parameters, error codes and warning messages. The JSON-RPC standard not say "you can't be REST", only say how to pack basic information.

"REST JSON-RPC" exists! is REST with "best practices", for minimal information packing, with simple and solid contracts.


Example

(from this answer and didactic context)

When dealing with REST, it generally helps to start by thinking in terms of resources. In this case, the resource is not just "bank account" but it is a transaction of that bank account... But JSON-RPC not obligates the "method" parameter, all are encoded by "path" of the endpoint.

  • REST Deposit with POST /Bank/Account/John/Transaction with JSON request {"jsonrpc": "2.0", "id": 12, "params": {"currency":"USD","amount":10}}.
    The JSON response can be something as {"jsonrpc": "2.0", "result": "sucess", "id": 12}

  • REST Withdraw with POST /Bank/Account/John/Transaction ... similar.

  • ... GET /Bank/Account/John/Transaction/12345@13 ... This could return a JSON record of that exact transaction (e.g. your users generally want a record of debits and credits on their account). Something as {"jsonrpc": "2.0", "result": {"debits":[...],"credits":[...]}, "id": 13}. The convention about (REST) GET request can include encode of id by "@id", so not need to send any JSON, but still using JSON-RPC in the response pack.

How do I download a file using VBA (without Internet Explorer)

This solution is based from this website: http://social.msdn.microsoft.com/Forums/en-US/bd0ee306-7bb5-4ce4-8341-edd9475f84ad/excel-2007-use-vba-to-download-save-csv-from-url

It is slightly modified to overwrite existing file and to pass along login credentials.

Sub DownloadFile()

Dim myURL As String
myURL = "https://YourWebSite.com/?your_query_parameters"

Dim WinHttpReq As Object
Set WinHttpReq = CreateObject("Microsoft.XMLHTTP")
WinHttpReq.Open "GET", myURL, False, "username", "password"
WinHttpReq.send

If WinHttpReq.Status = 200 Then
    Set oStream = CreateObject("ADODB.Stream")
    oStream.Open
    oStream.Type = 1
    oStream.Write WinHttpReq.responseBody
    oStream.SaveToFile "C:\file.csv", 2 ' 1 = no overwrite, 2 = overwrite
    oStream.Close
End If

End Sub

Best practices for Storyboard login screen, handling clearing of data upon logout

In Xcode 7 you can have multiple storyBoards. It will be better if you can keep the Login flow in a separate storyboard.

This can be done using SELECT VIEWCONTROLLER > Editor > Refactor to Storyboard

And here is the Swift version for setting a view as the RootViewContoller-

    let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
    appDelegate.window!.rootViewController = newRootViewController

    let rootViewController: UIViewController = UIStoryboard(name: "Main", bundle: nil).instantiateViewControllerWithIdentifier("LoginViewController")

Getting unique values in Excel by using formulas only

You can also do it this way.

Create the following named ranges:

nList = the list of original values
nRow = ROW(nList)-ROW(OFFSET(nList,0,0,1,1))+1
nUnique = IF(COUNTIF(OFFSET(nList,nRow,0),nList)=0,COUNTIF(nList, "<"&nList),"")

With these 3 named ranges you can generate the ordered list of unique values with the formula below. It will be sorted in ascending order.

IFERROR(INDEX(nList,MATCH(SMALL(nUnique,ROW()-?),nUnique,0)),"")

You will need to substitute the row number of the cell just above the first element of your unique ordered list for the '?' character.

eg. If your unique ordered list begins in cell B5 then the formula will be:

IFERROR(INDEX(nList,MATCH(SMALL(nUnique,ROW()-4),nUnique,0)),"")

Installation failed with message Invalid File

Delete the Intermediate folder after then run the project is working fine actually that APK builds to another system. Go to app/build/intermediates.

How do I hide the status bar in a Swift iOS app?

You really should implement prefersStatusBarHidden on your view controller(s):

Swift 3 and later

override var prefersStatusBarHidden: Bool {
    return true
}

JSONDecodeError: Expecting value: line 1 column 1

If you look at the output you receive from print() and also in your Traceback, you'll see the value you get back is not a string, it's a bytes object (prefixed by b):

b'{\n  "note":"This file    .....

If you fetch the URL using a tool such as curl -v, you will see that the content type is

Content-Type: application/json; charset=utf-8

So it's JSON, encoded as UTF-8, and Python is considering it a byte stream, not a simple string. In order to parse this, you need to convert it into a string first.

Change the last line of code to this:

info = json.loads(js.decode("utf-8"))

localhost refused to connect Error in visual studio

rebooting the machine was the only thing that worked for me

List of strings to one string

I would go with option A:

String.Join(String.Empty, los.ToArray());

My reasoning is because the Join method was written for that purpose. In fact if you look at Reflector, you'll see that unsafe code was used to really optimize it. The other two also WORK, but I think the Join function was written for this purpose, and I would guess, the most efficient. I could be wrong though...

As per @Nuri YILMAZ without .ToArray(), but this is .NET 4+:

String.Join(String.Empty, los);

Getting "Lock wait timeout exceeded; try restarting transaction" even though I'm not using a transaction

Late to the party (as usual) however my issue was the fact that I wrote some bad SQL (being a novice) and several processes had a lock on the record(s) <-- not sure the appropriate verbiage. I ended up having to just: SHOW PROCESSLIST and then kill the IDs using KILL <id>

SQL Server : How to test if a string has only digit characters

The selected answer does not work.

declare @str varchar(50)='79D136'
select 1 where @str NOT LIKE '%[^0-9]%'

I don't have a solution but know of this potential pitfall. The same goes if you substitute the letter 'D' for 'E' which is scientific notation.

Rounded corners for <input type='text' /> using border-radius.htc for IE

    border-bottom-color: #b3b3b3;
    border-bottom-left-radius: 3px;
    border-bottom-right-radius: 3px;
    border-bottom-style: solid;
    border-bottom-width: 1px;
    border-left-color: #b3b3b3;
    border-left-style: solid;
    border-left-width: 1px;
    border-right-color: #b3b3b3;
    border-right-style: solid;
    border-right-width: 1px;
    border-top-color: #b3b3b3;
    border-top-left-radius: 3px;
    border-top-right-radius: 3px;
    border-top-style: solid;
    border-top-width: 1px;

...Who cares IE6 we are in 2011 upgrade and wake up please!

How to create a localhost server to run an AngularJS project

cd <your project folder> (where your angularjs's deployable code is there)

sudo npm install serve -g

serve

You can hit your page at

localhost:3000 or IPaddress:3000

collapse cell in jupyter notebook

There are many answers to this question, all of which I feel are not satisfactory (some more than others), of the many extensions - code folding, folding by headings etc etc. None do what I want in simple and effective way. I am literally amazed that a solution has not been implemented (as it has for Jupyter Lab).

In fact, I was so dissatisfied that I have developed a very simple notebook extension that can expand/collapse the code in a notebook cell, while keeping it executable.

The GitHub repository: https://github.com/BenedictWilkinsAI/cellfolding

Below is a small demo of what the extension does:

Simply double clicking left of the code cell will collapse it to a single line:

Double clicking again will expand the cell.

The extension can be installed easily with pip:

pip install nbextension-cellfolding
jupyter nbextension install --py cellfolding --user
jupyter nbextension enable --py cellfolding --user 

and is also compatible with nbextension configurator. I hope that people will find this useful!

Failure [INSTALL_FAILED_INVALID_APK]

I had this problem on android Studio because in my Debug build i've added version name suffix -DEBUG and the - was the problem.

Try to only have letters, numbers and dots on your version names and application ids

Selecting/excluding sets of columns in pandas

Another option, without dropping or filtering in a loop:

import numpy as np
import pandas as pd

# Create a dataframe with columns A,B,C and D
df = pd.DataFrame(np.random.randn(100, 4), columns=list('ABCD'))

# include the columns you want
df[df.columns[df.columns.isin(['A', 'B'])]]

# or more simply include columns:
df[['A', 'B']]

# exclude columns you don't want
df[df.columns[~df.columns.isin(['C','D'])]]

# or even simpler since 0.24
# with the caveat that it reorders columns alphabetically 
df[df.columns.difference(['C', 'D'])]

Reading output of a command into an array in Bash

Here is an example. Imagine that you are going to put the files and directory names (under the current folder) to an array and count its items. The script would be like;

my_array=( `ls` )
my_array_length=${#my_array[@]}
echo $my_array_length

Or, you can iterate over this array by adding the following script:

for element in "${my_array[@]}"
do
   echo "${element}"
done

Please note that this is the core concept and the input is considered to be sanitized before, i.e. removing extra characters, handling empty Strings, and etc. (which is out of the topic of this thread).

Can't bind to 'routerLink' since it isn't a known property

In the current component's module import RouterModule.

Like:-

import {RouterModule} from '@angular/router';
@NgModule({
   declarations:[YourComponents],
   imports:[RouterModule]

...

It helped me.

Swift 2: Call can throw, but it is not marked with 'try' and the error is not handled

You have to catch the error just as you're already doing for your save() call and since you're handling multiple errors here, you can try multiple calls sequentially in a single do-catch block, like so:

func deleteAccountDetail() {
    let entityDescription = NSEntityDescription.entityForName("AccountDetail", inManagedObjectContext: Context!)
    let request = NSFetchRequest()
    request.entity = entityDescription

    do {
        let fetchedEntities = try self.Context!.executeFetchRequest(request) as! [AccountDetail]

        for entity in fetchedEntities {
            self.Context!.deleteObject(entity)
        }

        try self.Context!.save()
    } catch {
        print(error)
    }
}

Or as @bames53 pointed out in the comments below, it is often better practice not to catch the error where it was thrown. You can mark the method as throws then try to call the method. For example:

func deleteAccountDetail() throws {
    let entityDescription = NSEntityDescription.entityForName("AccountDetail", inManagedObjectContext: Context!)
    let request = NSFetchRequest()

    request.entity = entityDescription

    let fetchedEntities = try Context.executeFetchRequest(request) as! [AccountDetail]

    for entity in fetchedEntities {
        self.Context!.deleteObject(entity)
    }

    try self.Context!.save()
}

How do you search an amazon s3 bucket?

Not a technical answer, but I have built an application which allows for wildcard search: https://bucketsearch.net/

It will asynchronously index your bucket and then allow you to search the results.

It's free to use (donationware).

How can I add a line to a file in a shell script?

This doesn't use sed, but using >> will append to a file. For example:

echo 'one, two, three' >> testfile.csv

Edit: To prepend to a file, try something like this:

echo "text"|cat - yourfile > /tmp/out && mv /tmp/out yourfile

I found this through a quick Google search.

ASP.NET MVC Dropdown List From SelectList

Try this, just an example:

u.UserTypeOptions = new SelectList(new[]
    {
        new { ID="1", Name="name1" },
        new { ID="2", Name="name2" },
        new { ID="3", Name="name3" },
    }, "ID", "Name", 1);

Or

u.UserTypeOptions = new SelectList(new List<SelectListItem>
    {
        new SelectListItem { Selected = true, Text = string.Empty, Value = "-1"},
        new SelectListItem { Selected = false, Text = "Homeowner", Value = "2"},
        new SelectListItem { Selected = false, Text = "Contractor", Value = "3"},
    },"Value","Text");

Declaration of Methods should be Compatible with Parent Methods in PHP

I faced this problem while trying to extend an existing class from GitHub. I'm gonna try to explain myself, first writing the class as I though it should be, and then the class as it is now.

What I though

namespace mycompany\CutreApi;

use mycompany\CutreApi\ClassOfVendor;

class CutreApi extends \vendor\AwesomeApi\AwesomeApi
{
   public function whatever(): ClassOfVendor
   {
        return new ClassOfVendor();
   }
}

What I've finally done

namespace mycompany\CutreApi;

use \vendor\AwesomeApi\ClassOfVendor;

class CutreApi extends \vendor\AwesomeApi\AwesomeApi
{
   public function whatever(): ClassOfVendor
   {
        return new \mycompany\CutreApi\ClassOfVendor();
   }
}

So seems that this errror raises also when you're using a method that return a namespaced class, and you try to return the same class but with other namespace. Fortunately I have found this solution, but I do not fully understand the benefit of this feature in php 7.2, for me it is normal to rewrite existing class methods as you need them, including the redefinition of input parameters and / or even behavior of the method.

One downside of the previous aproach, is that IDE's could not recognise the new methods implemented in \mycompany\CutreApi\ClassOfVendor(). So, for now, I will go with this implementation.

Currently done

namespace mycompany\CutreApi;

use mycompany\CutreApi\ClassOfVendor;

class CutreApi extends \vendor\AwesomeApi\AwesomeApi
{
   public function getWhatever(): ClassOfVendor
   {
        return new ClassOfVendor();
   }
}

So, instead of trying to use "whatever" method, I wrote a new one called "getWhatever". In fact both of them are doing the same, just returning a class, but with diferents namespaces as I've described before.

Hope this can help someone.

Update UI from Thread in Android

The most simplest solution I have seen to supply a short execution to the UI thread is via the post() method of a view. This is needed since UI methods are not re-entrant. The method for this is:

package android.view;

public class View;

public boolean post(Runnable action);

The post() method corresponds to the SwingUtilities.invokeLater(). Unfortunately I didn't find something simple that corresponds to the SwingUtilities.invokeAndWait(), but one can build the later based on the former with a monitor and a flag.

So what you save by this is creating a handler. You simply need to find your view and then post on it. You can find your view via findViewById() if you tend to work with id-ed resources. The resulting code is very simple:

/* inside your non-UI thread */

view.post(new Runnable() {
        public void run() {
            /* the desired UI update */
        }
    });
}

Note: Compared to SwingUtilities.invokeLater() the method View.post() does return a boolean, indicating whether the view has an associated event queue. Since I used the invokeLater() resp. post() anyway only for fire and forget, I did not check the result value. Basically you should call post() only after onAttachedToWindow() has been called on the view.

Best Regards

Unexpected 'else' in "else" error

You need to rearrange your curly brackets. Your first statement is complete, so R interprets it as such and produces syntax errors on the other lines. Your code should look like:

if (dsnt<0.05) {
  wilcox.test(distance[result=='nt'],distance[result=='t'],alternative=c("two.sided"),paired=TRUE)
} else if (dst<0.05) {
  wilcox.test(distance[result=='nt'],distance[result=='t'],alternative=c("two.sided"),paired=TRUE)
} else {
  t.test(distance[result=='nt'],distance[result=='t'],alternative=c("two.sided"),paired=TRUE)       
} 

To put it more simply, if you have:

if(condition == TRUE) x <- TRUE
else x <- FALSE

Then R reads the first line and because it is complete, runs that in its entirety. When it gets to the next line, it goes "Else? Else what?" because it is a completely new statement. To have R interpret the else as part of the preceding if statement, you must have curly brackets to tell R that you aren't yet finished:

if(condition == TRUE) {x <- TRUE
 } else {x <- FALSE}

JavaScript: set dropdown selected item based on option text

You can loop through the select_obj.options. There's a #text method in each of the option object, which you can use to compare to what you want and set the selectedIndex of the select_obj.

How do I ignore an error on 'git pull' about my local changes would be overwritten by merge?

I got the same error-message executed the
:PluginUpdate command from the vim editors command-line

"Please commit your changes or stash them before you merge"

1. just physically removed the folder contained the plugins form the

rm -rf ~/.vim/bundle/plugin-folder/

2. and reinstalled it form the vim commandline,
:PluginInstall!
because my ~/.vimrc contained the instructions to build the plugin to that destination:

enter image description here

this created the proper folder,
and got new package into that folder ~./.vim/bundle/reinstalled-plugins-folder
The "!" signs (due to the unsuccessful PluginUpdate command) were changed
to "+" signs, and after that worked the PluginUpdate command to.

java calling a method from another class

You're very close. What you need to remember is when you're calling a method from another class you need to tell the compiler where to find that method.

So, instead of simply calling addWord("someWord"), you will need to initialise an instance of the WordList class (e.g. WordList list = new WordList();), and then call the method using that (i.e. list.addWord("someWord");.

However, your code at the moment will still throw an error there, because that would be trying to call a non-static method from a static one. So, you could either make addWord() static, or change the methods in the Words class so that they're not static.

My bad with the above paragraph - however you might want to reconsider ProcessInput() being a static method - does it really need to be?

How to select only the first rows for each unique value of a column?

to get every unique value from your customer table, use

SELECT DISTINCT CName FROM customertable;

more in-depth of w3schools: https://www.w3schools.com/sql/sql_distinct.asp

Update or Insert (multiple rows and columns) from subquery in PostgreSQL

OMG Ponies's answer works perfectly, but just in case you need something more complex, here is an example of a slightly more advanced update query:

UPDATE table1 
SET col1 = subquery.col2,
    col2 = subquery.col3 
FROM (
    SELECT t2.foo as col1, t3.bar as col2, t3.foobar as col3 
    FROM table2 t2 INNER JOIN table3 t3 ON t2.id = t3.t2_id
    WHERE t2.created_at > '2016-01-01'
) AS subquery
WHERE table1.id = subquery.col1;

Min / Max Validator in Angular 2 Final

I've added a max validation to amd's great answer.

import { Directive, Input, forwardRef } from '@angular/core'
import { NG_VALIDATORS, Validator, AbstractControl, Validators } from '@angular/forms'

/*
 * This is a wrapper for [min] and [max], used to work with template driven forms
 */

@Directive({
  selector: '[min]',
  providers: [{ provide: NG_VALIDATORS, useExisting: MinNumberValidator, multi: true }]
})
export class MinNumberValidator implements Validator {

  @Input() min: number;

  validate(control: AbstractControl): { [key: string]: any } {
    return Validators.min(this.min)(control)
  }
}

@Directive({
  selector: '[max]',
  providers: [{ provide: NG_VALIDATORS, useExisting: MaxNumberValidator, multi: true }]
})
export class MaxNumberValidator implements Validator {

  @Input() max: number;

  validate(control: AbstractControl): { [key: string]: any } {
    return Validators.max(this.max)(control)
  }
}

setTimeout or setInterval?

Both setInterval and setTimeout return a timer id that you can use to cancel the execution, that is, before the timeouts are triggered. To cancel you call either clearInterval or clearTimeout like this:

var timeoutId = setTimeout(someFunction, 1000);
clearTimeout(timeoutId);
var intervalId = setInterval(someFunction, 1000),
clearInterval(intervalId);

Also, the timeouts are automatically cancelled when you leave the page or close the browser window.

Specifying maxlength for multiline textbox

$('#txtInput').attr('maxLength', 100);

Uses of Action delegate in C#

I used the action delegate like this in a project once:

private static Dictionary<Type, Action<Control>> controldefaults = new Dictionary<Type, Action<Control>>() { 
            {typeof(TextBox), c => ((TextBox)c).Clear()},
            {typeof(CheckBox), c => ((CheckBox)c).Checked = false},
            {typeof(ListBox), c => ((ListBox)c).Items.Clear()},
            {typeof(RadioButton), c => ((RadioButton)c).Checked = false},
            {typeof(GroupBox), c => ((GroupBox)c).Controls.ClearControls()},
            {typeof(Panel), c => ((Panel)c).Controls.ClearControls()}
    };

which all it does is store a action(method call) against a type of control so that you can clear all the controls on a form back to there defaults.

How to Truncate a string in PHP to the word closest to a certain number of characters?

This will return the first 200 characters of words:

preg_replace('/\s+?(\S+)?$/', '', substr($string, 0, 201));

Does "git fetch --tags" include "git fetch"?

In most situations, git fetch should do what you want, which is 'get anything new from the remote repository and put it in your local copy without merging to your local branches'. git fetch --tags does exactly that, except that it doesn't get anything except new tags.

In that sense, git fetch --tags is in no way a superset of git fetch. It is in fact exactly the opposite.

git pull, of course, is nothing but a wrapper for a git fetch <thisrefspec>; git merge. It's recommended that you get used to doing manual git fetching and git mergeing before you make the jump to git pull simply because it helps you understand what git pull is doing in the first place.

That being said, the relationship is exactly the same as with git fetch. git pull is the superset of git pull --tags.

Tree view of a directory/folder in Windows?

tree /f /a

About

The Windows command tree /f /a produces a tree of the current folder and all files & folders contained within it in ASCII format.

The output can be redirected to a text file using the > parameter.

Method

For Windows 8.1 or Windows 10, follow these steps:

  1. Navigate into the folder in file explorer.
  2. Press Shift, right-click mouse, and select "Open command window here".
  3. Type tree /f /a > tree.txt and press Enter.
  4. Open the new tree.txt file in your favourite text editor/viewer.

Note: Windows 7, Vista, XP and earlier users can type cmd in the run command box in the start menu for a command window.