Programs & Examples On #Fusebox

Fusebox is a coding methodology for application development centered around the use of switch statements and naming conventions to organize code.

Handling InterruptedException in Java

What are you trying to do?

The InterruptedException is thrown when a thread is waiting or sleeping and another thread interrupts it using the interrupt method in class Thread. So if you catch this exception, it means that the thread has been interrupted. Usually there is no point in calling Thread.currentThread().interrupt(); again, unless you want to check the "interrupted" status of the thread from somewhere else.

Regarding your other option of throwing a RuntimeException, it does not seem a very wise thing to do (who will catch this? how will it be handled?) but it is difficult to tell more without additional information.

Transpose a range in VBA

You do not need to do this. Here is how to create a co-variance method:

Alternatively you can use statistical analysis package that Excel has.

Python ImportError: No module named wx

I had the same problem for a PyMOL plugin that required the wx module, though I installed wxpython by downloading its package from here (Unofficial Windows Binaries for Python Extension Packages) and installing it with the command:

pip install .\wxPython-

For some reason it gave me that error, for which I uninstalled it with:

pip uninstall wxPython

and then I downloaded it from here (wxPython 4.0.0a1) and reinstalled:

pip install .\wxPython-4.0.0a1-cp27-cp27m-win_amd64.whl

The error at this point has not been presented anymore.

Conflict with dependency ''. Resolved versions for app (23.1.0) and test app (23.0.1) differ

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

androidTestCompile('', {
    exclude group: '', module: 'support-annotations'

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

How to suspend/resume a process in Windows?

Without any external tool you can simply accomplish this on Windows 7 or 8, by opening up the Resource monitor and on the CPU or Overview tab right clicking on the process and selecting Suspend Process. The Resource monitor can be started from the Performance tab of the Task manager.

Check if two lists are equal

Use SequenceEqual to check for sequence equality because Equals method checks for reference equality.

var a = ints1.SequenceEqual(ints2);

Or if you don't care about elements order use Enumerable.All method:

var a = ints1.All(ints2.Contains);

The second version also requires another check for Count because it would return true even if ints2 contains more elements than ints1. So the more correct version would be something like this:

var a = ints1.All(ints2.Contains) && ints1.Count == ints2.Count;

In order to check inequality just reverse the result of All method:

var a = !ints1.All(ints2.Contains)

Make a nav bar stick

$(document).ready(function() {_x000D_
  $(window).scroll(function () {_x000D_
      //if you hard code, then use console_x000D_
      //.log to determine when you want the _x000D_
      //nav bar to stick.  _x000D_
    if ($(window).scrollTop() > 280) {_x000D_
    if ($(window).scrollTop() < 281) {_x000D_
html, body {_x000D_
 height: 4000px;_x000D_
.navbar-fixed {_x000D_
    top: 0;_x000D_
    z-index: 100;_x000D_
  position: fixed;_x000D_
    width: 100%;_x000D_
#body_div {_x000D_
 top: 0;_x000D_
 position: relative;_x000D_
    height: 200px;_x000D_
    background-color: green;_x000D_
#banner {_x000D_
 width: 100%;_x000D_
 height: 273px;_x000D_
    background-color: gray;_x000D_
 overflow: hidden;_x000D_
#nav_bar {_x000D_
 border: 0;_x000D_
 background-color: #202020;_x000D_
 border-radius: 0px;_x000D_
 margin-bottom: 0;_x000D_
    height: 30px;_x000D_
.nav_links {_x000D_
    margin: 0;_x000D_
.nav_links li {_x000D_
 display: inline-block;_x000D_
    margin-top: 4px;_x000D_
.nav_links li a {_x000D_
 padding: 0 15.5px;_x000D_
 color: #3498db;_x000D_
 text-decoration: none;_x000D_
<script src=""></script>_x000D_
<div id="banner">_x000D_
     <h2>put what you want here</h2>_x000D_
     <p>just adjust javascript size to match this window</p>_x000D_
  <nav id='nav_bar'>_x000D_
    <ul class='nav_links'>_x000D_
      <li><a href="url">Nav Bar</a></li>_x000D_
      <li><a href="url">Sign In</a></li>_x000D_
      <li><a href="url">Blog</a></li>_x000D_
      <li><a href="url">About</a></li>_x000D_
<div id='body_div'>_x000D_
    <p style='margin: 0; padding-top: 50px;'>and more stuff to continue scrolling here</p>_x000D_

javascript, is there an isObject function like isArray?

In jQuery there is $.isPlainObject() method for that:

Description: Check to see if an object is a plain object (created using "{}" or "new Object").

How can I create a Java 8 LocalDate from a long Epoch time in Milliseconds?

Timezones and stuff aside, a very simple alternative to new Date(startDateLong) could be LocalDate.ofEpochDay(startDateLong / 86400000L)

Is it a bad practice to use an if-statement without curly braces?

Personally I use the first style only throw an exception or return from a method prematurely. Like argument Checking at the beginning of a function, because in these cases, rarely do I have have more than one thing to do, and there is never an else.


if (argument == null)
    throw new ArgumentNullException("argument");

if (argument < 0)
    return false;

Otherwise I use the second style.

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

Use the dateFormat option

        $("#to").datepicker({ dateFormat: 'yy-mm-dd' });
        $("#from").datepicker({ dateFormat: 'yy-mm-dd' }).bind("change",function(){
            var minValue = $(this).val();
            minValue = $.datepicker.parseDate("yy-mm-dd", minValue);
            $("#to").datepicker( "option", "minDate", minValue );

Demo at

Insert Data Into Tables Linked by Foreign Key

You can do it in one sql statement for existing customers, 3 statements for new ones. All you have to do is be an optimist and act as though the customer already exists:

insert into "order" (customer_id, price) values \
((select customer_id from customer where name = 'John'), 12.34);

If the customer does not exist, you'll get an sql exception which text will be something like:

null value in column "customer_id" violates not-null constraint

(providing you made customer_id non-nullable, which I'm sure you did). When that exception occurs, insert the customer into the customer table and redo the insert into the order table:

insert into customer(name) values ('John');
insert into "order" (customer_id, price) values \
((select customer_id from customer where name = 'John'), 12.34);

Unless your business is growing at a rate that will make "where to put all the money" your only real problem, most of your inserts will be for existing customers. So, most of the time, the exception won't occur and you'll be done in one statement.

Put a Delay in Javascript

If you're okay with ES2017, await is good:

const DEF_DELAY = 1000;

function sleep(ms) {
  return new Promise(resolve => setTimeout(resolve, ms || DEF_DELAY));

await sleep(100);

Note that the await part needs to be in an async function:

//IIAFE (immediately invoked async function expression)
  //Do some stuff
  await sleep(100);
  //Do some more stuff

How to watch for form changes in Angular

I thought about using the (ngModelChange) method, then thought about the FormBuilder method, and finally settled on a variation of Method 3. This saves decorating the template with extra attributes and automatically picks up changes to the model - reducing the possibility of forgetting something with Method 1 or 2.

Simplifying Method 3 a bit...

oldPerson = JSON.parse(JSON.stringify(this.person));

ngDoCheck(): void {
    if (JSON.stringify(this.person) !== JSON.stringify(this.oldPerson)) {
        this.oldPerson = JSON.parse(JSON.stringify(this.person));

You could add a timeout to only call doSomething() after x number of milliseconds to simulate debounce.

oldPerson = JSON.parse(JSON.stringify(this.person));

ngDoCheck(): void {
    if (JSON.stringify(this.person) !== JSON.stringify(this.oldPerson)) {
        if (timeOut) clearTimeout(timeOut);
        let timeOut = setTimeout(this.doSomething(), 2000);
        this.oldPerson = JSON.parse(JSON.stringify(this.person));

Corrupt jar file

Also, make sure that the java version used at runtime is an equivalent or later version than the java used during compilation

Using WGET to run a cronjob PHP

you can just use this code to hit the script using cron job using cpanel:


How to find the installed pandas version


pip  list

You should get a list of packages (including panda) and their versions, e.g.:

beautifulsoup4 (4.5.1)
cycler (0.10.0)
jdcal (1.3)
matplotlib (1.5.3)
numpy (1.11.1)
openpyxl (2.2.0b1)
pandas (0.18.1)
pip (8.1.2)
pyparsing (2.1.9)
python-dateutil (2.2)
python-nmap (0.6.1)
pytz (2016.6.1)
requests (2.11.1)
setuptools (20.10.1)
six (1.10.0)
SQLAlchemy (1.0.15)
xlrd (1.0.0)

Using GPU from a docker container?

Regan's answer is great, but it's a bit out of date, since the correct way to do this is avoid the lxc execution context as Docker has dropped LXC as the default execution context as of docker 0.9.

Instead it's better to tell docker about the nvidia devices via the --device flag, and just use the native execution context rather than lxc.


These instructions were tested on the following environment:

  • Ubuntu 14.04
  • CUDA 6.5
  • AWS GPU instance.

Install nvidia driver and cuda on your host

See CUDA 6.5 on AWS GPU Instance Running Ubuntu 14.04 to get your host machine setup.

Install Docker

$ sudo apt-key adv --keyserver hkp:// --recv-keys 36A1D7869245C8950F966E92D8576A8BA88D21E9
$ sudo sh -c "echo deb docker main > /etc/apt/sources.list.d/docker.list"
$ sudo apt-get update && sudo apt-get install lxc-docker

Find your nvidia devices

ls -la /dev | grep nvidia

crw-rw-rw-  1 root root    195,   0 Oct 25 19:37 nvidia0 
crw-rw-rw-  1 root root    195, 255 Oct 25 19:37 nvidiactl
crw-rw-rw-  1 root root    251,   0 Oct 25 19:37 nvidia-uvm

Run Docker container with nvidia driver pre-installed

I've created a docker image that has the cuda drivers pre-installed. The dockerfile is available on dockerhub if you want to know how this image was built.

You'll want to customize this command to match your nvidia devices. Here's what worked for me:

 $ sudo docker run -ti --device /dev/nvidia0:/dev/nvidia0 --device /dev/nvidiactl:/dev/nvidiactl --device /dev/nvidia-uvm:/dev/nvidia-uvm tleyden5iwx/ubuntu-cuda /bin/bash

Verify CUDA is correctly installed

This should be run from inside the docker container you just launched.

Install CUDA samples:

$ cd /opt/nvidia_installers
$ ./ -noprompt -cudaprefix=/usr/local/cuda-6.5/

Build deviceQuery sample:

$ cd /usr/local/cuda/samples/1_Utilities/deviceQuery
$ make
$ ./deviceQuery   

If everything worked, you should see the following output:

deviceQuery, CUDA Driver = CUDART, CUDA Driver Version = 6.5, CUDA Runtime Version = 6.5, NumDevs =    1, Device0 = GRID K520
Result = PASS

How to List All Redis Databases?

Or you can just run the following command and you will see all databases of the Redis instance without firing up redis-cli:

$ redis-cli INFO | grep ^db

Remove credentials from Git

You can remove the line credential.helper=!github --credentials from the following file C:\Program Files\Git\mingw64\etc\gitconfig in order to remove the credentials for git

ActiveX component can't create object

It's also worth checking that you've got "Enable 32-bit Applications" set to True in the advanced settings of the DefaultAppPool within IIS.

Can I prevent text in a div block from overflowing?

!! Hard coded tradoff ahead !! Depending on the surrounding code and the screen resolution this could lead to different / unwanted behaviour

If hidden overflow is out of the question and correct hyphenation is needed you could use the soft hyphen HTML entity where you want the word / text to break. This way you are able to predetermine a breaking point manually.


The hyphen will only appear when the word needs to break to not overflow its surrounding container.


<div class="container">

Result if the container is wide enough and the text would not overflow the container:


Result if the container is to small and the text would actually overflow the container:


  background-color: green;_x000D_
  max-width: 30px;_x000D_
Example 1 - container to small => text overflows container:_x000D_
<div class="container">_x000D_
Example 2 - using soft hyphen => text breaks at predetermined break point:_x000D_
<div class="container">_x000D_
Example 3 - using soft hyphen => text still overflowing because the text before the soft hyphen is to long:_x000D_
<div class="container">_x000D_

Further information:

Merging arrays with the same keys

$arr1 = array(
   "0" => array("fid" => 1, "tid" => 1, "name" => "Melon"),
   "1" => array("fid" => 1, "tid" => 4, "name" => "Tansuozhe"),
   "2" => array("fid" => 1, "tid" => 6, "name" => "Chao"),
   "3" => array("fid" => 1, "tid" => 7, "name" => "Xi"),
   "4" => array("fid" => 2, "tid" => 9, "name" => "Xigua")

if you want to convert this array as following:

$arr2 = array(
   "0" => array(
          "0" => array("fid" => 1, "tid" => 1, "name" => "Melon"),
          "1" => array("fid" => 1, "tid" => 4, "name" => "Tansuozhe"),
          "2" => array("fid" => 1, "tid" => 6, "name" => "Chao"),
          "3" => array("fid" => 1, "tid" => 7, "name" => "Xi")

    "1" => array(
          "0" =>array("fid" => 2, "tid" => 9, "name" => "Xigua")

so, my answer will be like this:

$outer_array = array();
$unique_array = array();
foreach($arr1 as $key => $value)
    $inner_array = array();

    $fid_value = $value['fid'];
    if(!in_array($value['fid'], $unique_array))
            array_push($unique_array, $fid_value);
            array_push($inner_array, $value);
            $outer_array[$fid_value] = $inner_array;

            array_push($outer_array[$fid_value], $value);


hope this answer will help somebody sometime.

What is the difference between lower bound and tight bound?

Θ-notation (theta notation) is called tight-bound because it's more precise than O-notation and Ω-notation (omega notation).

If I were lazy, I could say that binary search on a sorted array is O(n2), O(n3), and O(2n), and I would be technically correct in every case. That's because O-notation only specifies an upper bound, and binary search is bounded on the high side by all of those functions, just not very closely. These lazy estimates would be useless.

Θ-notation solves this problem by combining O-notation and Ω-notation. If I say that binary search is Θ(log n), that gives you more precise information. It tells you that the algorithm is bounded on both sides by the given function, so it will never be significantly faster or slower than stated.

How do I get the serial key for Visual Studio Express?

I believe that if you download the offline ISO image file, and use that to install Visual Studio Express, you won't have to register.

Go here and find the link that says "All - Offline Install ISO image file". Click on it to expand it, select your language, and then click "Download".

Otherwise, it's possible that online registration is simply down for a while, as the error message indicates. You have 30 days before it expires, so give it a few days before starting to panic.

Proper way to get page content

I've answered my own question. Call apply_filter and there you go.

$post = get_post($id); 
$content = apply_filters('the_content', $post->post_content); 
echo $content;  

How to get primary key column in Oracle?

Save the following script as something like findPK.sql.

set verify off
accept TABLE_NAME char prompt 'Table name>'

SELECT cols.column_name
FROM all_constraints cons NATURAL JOIN all_cons_columns cols
WHERE cons.constraint_type = 'P' AND table_name = UPPER('&TABLE_NAME');

It can then be called using


Twitter Bootstrap scrollable table rows and fixed header

<table class="table table-striped table-condensed table-hover rsk-tbl vScrollTHead">
                <th>Risk Element</th>
                <th>Risk Value</th>
<div class="vScrollTable">
            <table class="table table-striped table-condensed table-hover rsk-tbl vScrollTBody">
                <tr class="">
                    <td>Jewellery business</td>

                </tr><tr class="">
                    <td>none-governmental organizations</td>


.vScrollTHead {


having two tables for head and body worked for me

Calculate correlation with cor(), only for numerical columns

For numerical data you have the solution. But it is categorical data, you said. Then life gets a bit more complicated...

Well, first : The amount of association between two categorical variables is not measured with a Spearman rank correlation, but with a Chi-square test for example. Which is logic actually. Ranking means there is some order in your data. Now tell me which is larger, yellow or red? I know, sometimes R does perform a spearman rank correlation on categorical data. If I code yellow 1 and red 2, R would consider red larger than yellow.

So, forget about Spearman for categorical data. I'll demonstrate the chisq-test and how to choose columns using combn(). But you would benefit from a bit more time with Agresti's book :

X <- rep(c("A","B"),20)
Y <- sample(c("C","D"),40,replace=T)

# I don't use Yates continuity correction

#Let's make a matrix with tons of columns

Data <-

# You want to select which columns to use
columns <- c(3,7,11,24)
vars <- names(Data)[columns]

# say you need to know which ones are associated with each other.
out <-  apply( combn(columns,2),2,function(x){

out <- cbind(,2))),out)

Then you should get :

> out
   V1  V2       out
1  V3  V7 0.8116733
2  V3 V11 0.1096903
3  V3 V24 0.1653670
4  V7 V11 0.3629871
5  V7 V24 0.4947797
6 V11 V24 0.7259321

Where V1 and V2 indicate between which variables it goes, and "out" gives the p-value for association. Here all variables are independent. Which you would expect, as I created the data at random.

Finding common rows (intersection) in two Pandas dataframes

If I understand you correctly, you can use a combination of Series.isin() and DataFrame.append():

In [80]: df1
   rating  user_id
0       2  0x21abL
1       1  0x21abL
2       1   0xdafL
3       0  0x21abL
4       4  0x1d14L
5       2  0x21abL
6       1  0x21abL
7       0   0xdafL
8       4  0x1d14L
9       1  0x21abL

In [81]: df2
   rating      user_id
0       2      0x1d14L
1       1    0xdbdcad7
2       1      0x21abL
3       3      0x21abL
4       3      0x21abL
5       1  0x5734a81e2
6       2      0x1d14L
7       0       0xdafL
8       0      0x1d14L
9       4  0x5734a81e2

In [82]: ind = df2.user_id.isin(df1.user_id) & df1.user_id.isin(df2.user_id)

In [83]: ind
0     True
1    False
2     True
3     True
4     True
5    False
6     True
7     True
8     True
9    False
Name: user_id, dtype: bool

In [84]: df1[ind].append(df2[ind])
   rating  user_id
0       2  0x21abL
2       1   0xdafL
3       0  0x21abL
4       4  0x1d14L
6       1  0x21abL
7       0   0xdafL
8       4  0x1d14L
0       2  0x1d14L
2       1  0x21abL
3       3  0x21abL
4       3  0x21abL
6       2  0x1d14L
7       0   0xdafL
8       0  0x1d14L

This is essentially the algorithm you described as "clunky", using idiomatic pandas methods. Note the duplicate row indices. Also, note that this won't give you the expected output if df1 and df2 have no overlapping row indices, i.e., if

In [93]: df1.index & df2.index
Out[93]: Int64Index([], dtype='int64')

In fact, it won't give the expected output if their row indices are not equal.

"Too many values to unpack" Exception

That exception means that you are trying to unpack a tuple, but the tuple has too many values with respect to the number of target variables. For example: this work, and prints 1, then 2, then 3

def returnATupleWithThreeValues():
    return (1,2,3)
a,b,c = returnATupleWithThreeValues()
print a
print b
print c

But this raises your error

def returnATupleWithThreeValues():
    return (1,2,3)
a,b = returnATupleWithThreeValues()
print a
print b


Traceback (most recent call last):
  File "", line 3, in ?
    a,b = returnATupleWithThreeValues()
ValueError: too many values to unpack

Now, the reason why this happens in your case, I don't know, but maybe this answer will point you in the right direction.

Error retrieving parent for item: No resource found that matches the given name '@android:style/TextAppearance.Holo.Widget.ActionBar.Title'

This happens because in r6 it shows an error when you try to extend private styles.

Refer to this link

running a command as a super user from a python script

To run a command as root, and pass it the password at the command prompt, you could do it as so:

import subprocess
from getpass import getpass

ls = "sudo -S ls -al".split()
cmd =
    ls, stdout=subprocess.PIPE, input=getpass("password: "), encoding="ascii",

For your example, probably something like this:

import subprocess
from getpass import getpass

restart_apache = "sudo /usr/sbin/apache2ctl restart".split()
proc =
    input=getpass("password: "),

How to properly validate input values with React.JS?

I recently spent a week studying lot of solutions to validate my forms in an app. I started with all the most stared one but I couldn't find one who was working as I was expected. After few days, I became quite frustrated until i found a very new and amazing plugin:

The developper is very responsive and his solution, after my research, merit to become the most stared one from my perspective. I hope it could help and you'll appreciate.

Call a function after previous function is complete

Specify an anonymous callback, and make function1 accept it:

    if (condition == 'true'){
        function1(someVariable, function() {
    else {

function function1(param, callback) { stuff

Angular2 - Focusing a textbox on component load

I didn't have much luck with many of these solutions on all browsers. This is the solution that worked for me.

For router changes: => {
    setTimeout(() => {
        if (this.searchElement) {
    }, 1);

Then ngAfterViewInit() for the onload scenario.

Where does Android app package gets installed on phone

System apps installed /system/app/ or /system/priv-app. Other apps can be installed in /data/app or /data/preload/.

Connect to your android mobile with USB and run the following commands. You will see all the installed packages.

$ adb shell 

$ pm list packages -f

Python function pointer

It's much nicer to be able to just store the function itself, since they're first-class objects in python.

import mypackage

myfunc = mypackage.mymodule.myfunction
myfunc(parameter1, parameter2)

But, if you have to import the package dynamically, then you can achieve this through:

mypackage = __import__('mypackage')
mymodule = getattr(mypackage, 'mymodule')
myfunction = getattr(mymodule, 'myfunction')

myfunction(parameter1, parameter2)

Bear in mind however, that all of that work applies to whatever scope you're currently in. If you don't persist them somehow, you can't count on them staying around if you leave the local scope.

IntelliJ IDEA 13 uses Java 1.5 despite setting to 1.7

First, you need to change the "project bytecode version" under File > Settings, Compiler > Java Compiler

Second, do a full rebuild.

List file names based on a filename pattern and file content?

find /folder -type f -mtime -90 | grep -E "(.txt|.php|.inc|.root|.gif)" | xargs ls -l > WWWlastActivity.log

Responding with a JSON object in Node.js (converting object/array to JSON string)

in express there may be application-scoped JSON formatters.

after looking at express\lib\response.js, I'm using this routine:

function writeJsonPToRes(app, req, res, obj) {
    var replacer = app.get('json replacer');
    var spaces = app.get('json spaces');
    res.set('Content-Type', 'application/json');
    var partOfResponse = JSON.stringify(obj, replacer, spaces)
        .replace(/\u2028/g, '\\u2028')
        .replace(/\u2029/g, '\\u2029');
    var callback = req.query[app.get('jsonp callback name')];
    if (callback) {
        if (Array.isArray(callback)) callback = callback[0];
        res.set('Content-Type', 'text/javascript');
        var cb = callback.replace(/[^\[\]\w$.]/g, '');
        partOfResponse = 'typeof ' + cb + ' === \'function\' && ' + cb + '(' + partOfResponse + ');\n';

Removing NA in dplyr pipe

I don't think desc takes an na.rm argument... I'm actually surprised it doesn't throw an error when you give it one. If you just want to remove NAs, use na.omit (base) or tidyr::drop_na:

outcome.df %>%
  na.omit() %>%
  group_by(Hospital, State) %>%
  arrange(desc(HeartAttackDeath)) %>%

outcome.df %>%
  drop_na() %>%
  group_by(Hospital, State) %>%
  arrange(desc(HeartAttackDeath)) %>%

If you only want to remove NAs from the HeartAttackDeath column, filter with, or use tidyr::drop_na:

outcome.df %>%
  filter(! %>%
  group_by(Hospital, State) %>%
  arrange(desc(HeartAttackDeath)) %>%

outcome.df %>%
  drop_na(HeartAttackDeath) %>%
  group_by(Hospital, State) %>%
  arrange(desc(HeartAttackDeath)) %>%

As pointed out at the dupe, complete.cases can also be used, but it's a bit trickier to put in a chain because it takes a data frame as an argument but returns an index vector. So you could use it like this:

outcome.df %>%
  filter(complete.cases(.)) %>%
  group_by(Hospital, State) %>%
  arrange(desc(HeartAttackDeath)) %>%

How to zip a file using cmd line?

Not exactly zipping, but you can compact files in Windows with the compact command:

compact /c /s:<directory or file>

And to uncompress:

compact /u /s:<directory or file>

NOTE: These commands only mark/unmark files or directories as compressed in the file system. They do not produces any kind of archive (like zip, 7zip, rar, etc.)

Extract a substring according to a pattern

If you are using data.table then tstrsplit() is a natural choice:

tstrsplit(string, ":")[[2]]
[1] "E001" "E002" "E003"

jQuery + client-side template = "Syntax error, unrecognized expression"

I guess your template is starting with a space or a tab.

You can use jQuery like that:


or parse the string to remove spaces of the beginning:

$(modal_template_html.replace(/^[ \t]+/gm, ''));

How do you run a js file using npm scripts?

You should use npm run-script build or npm build <project_folder>. More info here:

Anyway to prevent the Blue highlighting of elements in Chrome when clicking quickly?

I'm running Chrome version 60 and none of the previous CSS answers worked.

I found that Chrome was adding the blue highlight via the outline style. Adding the following CSS fixed it for me:

:focus {
    outline: none !important;

user authentication libraries for node.js?

A different take on authentication is Passwordless, a token-based authentication module for express that circumvents the inherent problem of passwords [1]. It's fast to implement, doesn't require too many forms, and offers better security for the average user (full disclosure: I'm the author).

[1]: Passwords are Obsolete

Get the Query Executed in Laravel 3/4

Using the query log doesnt give you the actual RAW query being executed, especially if there are bound values. This is the best approach to get the raw sql:


or more involved:

$query = Article::whereIn('author_id', [1,2,3])->orderBy('published', 'desc')->toSql();

Correct way to find max in an Array in Swift

With Swift 1.2 (and maybe earlier) you now need to use:

let nums = [1, 6, 3, 9, 4, 6];
let numMax = nums.reduce(Int.min, combine: { max($0, $1) })

For working with Double values I used something like this:

let nums = [1.3, 6.2, 3.6, 9.7, 4.9, 6.3];
let numMax = nums.reduce(-Double.infinity, combine: { max($0, $1) })

Disable automatic sorting on the first column when using jQuery DataTables

If any of other solution doesn't fix it, try to override the styles to hide the sort togglers:

.sorting_asc:after, .sorting_desc:after {
  content: "";

TypeError: 'float' object is not callable

You have forgotten a * between -3.7 and (prof[x]).


for x in range(len(prof)):
    PB = 2.25 * (1 - math.pow(math.e, (-3.7 * (prof[x])/2.25))) * (math.e, (0/2.25)))

Also, there seems to be missing an ( as I count 6 times ( and 7 times ), and I think (math.e, (0/2.25)) is missing a function call (probably math.pow, but thats just a wild guess).

AngularJS $location not changing the path

Instead of $location.path(...) to change or refresh the page, I used the service $window. In Angular this service is used as interface to the window object, and the window object contains a property location which enables you to handle operations related to the location or URL stuff.

For example, with window.location you can assign a new page, like this:


Or refresh it, like this:


It worked for me. It's a little bit different from you expect but works for the given goal.

How to remove duplicate values from an array in PHP

function arrayUnique($myArray)
    $newArray = Array();
    if (is_array($myArray))
        foreach($myArray as $key=>$val)
            if (is_array($val))
                $val2 = arrayUnique($val);
                $val2 = $val;
            if (!empty($val2))
                $newArray[$key] = $val2;
    return ($newArray);

function deleteEmpty($myArray)
    $retArray= Array();
    foreach($myArray as $key=>$val)
        if (($key<>"") && ($val<>""))
            $retArray[$key] = $val;
    return $retArray;

how to fire event on file select

Do whatever you want to do after the file loads successfully.just after the completion of your file processing set the value of file control to blank the .change() will always be called even the file name changes or not. like for example you can do this thing and worked for me like charm

  $('#myFile').change(function () {
    LoadFile("myFile");//function to do processing of file.
    $('#myFile').val('');// set the value to empty of myfile control.

Case-insensitive search in Rails model

In postgres:

 user = User.find(:first, :conditions => ['username ~* ?', "regedarek"])

BSTR to std::string (std::wstring) and vice versa

There is a c++ class called _bstr_t. It has useful methods and a collection of overloaded operators.

For example, you can easily assign from a const wchar_t * or a const char * just doing _bstr_t bstr = L"My string"; Then you can convert it back doing const wchar_t * s = bstr.operator const wchar_t *();. You can even convert it back to a regular char const char * c = bstr.operator char *(); You can then just use the const wchar_t * or the const char * to initialize a new std::wstring oe std::string.

What does the "map" method do in Ruby?

Map is a part of the enumerable module. Very similar to "collect" For Example:

  Class Car

    attr_accessor :name, :model, :year

    Def initialize (make, model, year)
      @make, @model, @year = make, model, year


  list = []
  list <<"Honda", "Accord", 2016)
  list <<"Toyota", "Camry", 2015)
  list <<"Nissan", "Altima", 2014)

  p {|p| p.model}

Map provides values iterating through an array that are returned by the block parameters.

SQL Last 6 Months

.... where yourdate_column > DATE_SUB(now(), INTERVAL 6 MONTH)

Why am I seeing "TypeError: string indices must be integers"?

data is a dict object. So, iterate over it like this:

Python 2

for key, value in data.iteritems():
    print key, value

Python 3

for key, value in data.items():
    print(key, value)

How to convert an XML file to nice pandas dataframe?

You can easily use xml (from the Python standard library) to convert to a pandas.DataFrame. Here's what I would do (when reading from a file replace xml_data with the name of your file or file object):

import pandas as pd
import xml.etree.ElementTree as ET
import io

def iter_docs(author):
    author_attr = author.attrib
    for doc in author.iter('document'):
        doc_dict = author_attr.copy()
        doc_dict['data'] = doc.text
        yield doc_dict

xml_data = io.StringIO(u'''\
<author type="XXX" language="EN" gender="xx" feature="xx" web="">
    <documents count="N">
        <document KEY="e95a9a6c790ecb95e46cf15bee517651" web=""><![CDATA[A large text with lots of strings and punctuations symbols [...]
        <document KEY="bc360cfbafc39970587547215162f0db" web=""><![CDATA[A large text with lots of strings and punctuations symbols [...]
        <document KEY="19e71144c50a8b9160b3f0955e906fce" web=""><![CDATA[A large text with lots of strings and punctuations symbols [...]
        <document KEY="21d4af9021a174f61b884606c74d9e42" web=""><![CDATA[A large text with lots of strings and punctuations symbols [...]
        <document KEY="28a45eb2460899763d709ca00ddbb665" web=""><![CDATA[A large text with lots of strings and punctuations symbols [...]
        <document KEY="a0c0712a6a351f85d9f5757e9fff8946" web=""><![CDATA[A large text with lots of strings and punctuations symbols [...]
        <document KEY="626726ba8d34d15d02b6d043c55fe691" web=""><![CDATA[A large text with lots of strings and punctuations symbols [...]
        <document KEY="2cb473e0f102e2e4a40aa3006e412ae4" web=""><![CDATA[A large text with lots of strings and punctuations symbols [...] [...]

etree = ET.parse(xml_data) #create an ElementTree object 
doc_df = pd.DataFrame(list(iter_docs(etree.getroot())))

If there are multiple authors in your original document or the root of your XML is not an author, then I would add the following generator:

def iter_author(etree):
    for author in etree.iter('author'):
        for row in iter_docs(author):
            yield row

and change doc_df = pd.DataFrame(list(iter_docs(etree.getroot()))) to doc_df = pd.DataFrame(list(iter_author(etree)))

Have a look at the ElementTree tutorial provided in the xml library documentation.

Can constructors throw exceptions in Java?

Yes, constructors are allowed to throw exceptions.

However, be very wise in choosing what exceptions they should be - checked exceptions or unchecked. Unchecked exceptions are basically subclasses of RuntimeException.

In almost all cases (I could not come up with an exception to this case), you'll need to throw a checked exception. The reason being that unchecked exceptions (like NullPointerException) are normally due to programming errors (like not validating inputs sufficiently).

The advantage that a checked exception offers is that the programmer is forced to catch the exception in his instantiation code, and thereby realizes that there can be a failure to create the object instance. Of course, only a code review will catch the poor programming practice of swallowing an exception.

String contains another string

You can use .indexOf():

if(str.indexOf(substr) > -1) {


How to check if android checkbox is checked within its onClick method (declared in XML)?

You can try this code:

public void itemClicked(View v) {
 //code to check if this checkbox is checked!
   // code inside if

Add a new line to a text file in MS-DOS

echo Hello, > file.txt
echo.       >>file.txt
echo world  >>file.txt

and you can always run:

wordpad file.txt

on any version of Windows.

On Windows 2000 and above you can do:

( echo Hello, & echo. & echo world ) > file.txt

Another way of showing a message for a small amount of text is to create file.vbs containing:

Msgbox "Hello," & vbCrLf & vbCrLf & "world", 0, "Message"

Call it with

cscript /nologo file.vbs

Or use wscript if you don't need it to wait until they click OK.

The problem with the message you're writing is that the vertical bar (|) is the "pipe" operator. You'll need to escape it by using ^| instead of |.

P.S. it's spelled Pwned.

Getting Google+ profile picture url with user_id

Google had changed their policy so the old way for getting the Google profile image will not work now, which was

New Way for doing this is


That will give the Google profile image url in json format as given below

Response :

         "url": ""

More parameters can be found to send with URL which you may need from here

For more detail you can also check the given question where I have answered for same type of problem How to get user image through user id in Google plus?

Stretch child div height to fill parent that has dynamic height

You can do it easily with a bit of jQuery

  var parentHeight = $("#parentDiv").parent().height();

What does the 'static' keyword do in a class?

A field can be assigned to either the class or an instance of a class. By default fields are instance variables. By using static the field becomes a class variable, thus there is one and only one clock. If you make a changes in one place, it's visible everywhere. Instance varables are changed independently of one another.

How do I create a transparent Activity on Android?

For dialog activity I use this:


But you also need to set your main View in the activity to invisible. Otherwise the background will be invisible while all views in it will be visible.

Can I install/update WordPress plugins without providing FTP access?

Here is a simple method.

Execute following commands.

This will enable your mod_rewrite module for Apache

$sudo a2enmod rewrite

This Command will change the owner of the folder to www-data

$sudo chown -R www-data [Wordpress Folder Location]

After You executing above commands you can install any themes without FTP.

PostgreSQL JOIN data from 3 tables

Something like:

select, t2.image_id, t3.path
from table1 t1 inner join table2 t2 on t1.person_id = t2.person_id
inner join table3 t3 on t2.image_id=t3.image_id

How to reload the current route with the angular 2 router

subscribe to route parameter changes

    // parent param listener ie: "/:id"
    this.route.params.subscribe(params => {
        // do something on parent param change
        let parent_id = params['id']; // set slug

    // child param listener ie: "/:id/:id"
    this.route.firstChild.params.subscribe(params => {
        // do something on child param change
        let child_id = params['id'];

What to return if Spring MVC controller method doesn't return value?

you can return void, then you have to mark the method with @ResponseStatus(value = HttpStatus.OK) you don't need @ResponseBody

@RequestMapping(value = "/updateSomeData" method = RequestMethod.POST)
@ResponseStatus(value = HttpStatus.OK)
public void updateDataThatDoesntRequireClientToBeNotified(...) {

Only get methods return a 200 status code implicity, all others you have do one of three things:

  • Return void and mark the method with @ResponseStatus(value = HttpStatus.OK)
  • Return An object and mark it with @ResponseBody
  • Return an HttpEntity instance

Image scaling causes poor quality in firefox/internet explorer but not chrome

Seems Chrome downscaling is best but the real question is why use such a massive image on the web if you use show is so massively scaled down? Downloadtimes as seen on the test page above are terrible. Especially for responsive websites a certain amount of scaling makes sense, actually more a scale up than scale down though. But never in such a (sorry pun) scale.

Seems this is more a theoretical problem which Chrome seems to deal with nicely but actually should not happen and actually should not be used in practice IMHO.

Android- create JSON Array and JSON Object

You can create a a method and pass paramters to it and get the json as a response.

  private JSONObject jsonResult(String Name,int id, String curriculum) throws JSONException {
        JSONObject json = null;
        json = new JSONObject("{\"" + "Name" + "\":" + "\"" + Name+ "\""
            + "," + "\"" + "Id" + "\":" + id + "," + "\"" + "Curriculum"
            + "\":" + "\"" + curriculum+ "\"" + "}");
        return json;

I hope this will help you.

JavaScript - Replace all commas in a string

Just for fun:

var mystring = "this,is,a,test"  
var newchar = '|'
mystring = mystring.split(',').join(newchar);

Use querystring variables in MVC controller

Here is what I came up with. I was having major problems with this and believe I am in MVC 6 now but this may be helpful to someone even myself in the future..

//The issue was that Reqest.Form Request.Querystring and Request not working in MVC the solution is to use Context.Request.Form and also making sure the form has been submitted otherwise null reference or context issue bug will show up.

     if(Context.Request.ContentLength != null)
         String StartDate = Context.Request.Form["StartMonth"].ToString();
         String EndMonth = Context.Request.Form["EndMonth"].ToString();
        // Vendor


Install opencv for Python 3.3

I know this is an old thread, but just in case anyone is looking, here is how I got it working on El Capitan:

brew install opencv3 --with-python3

and wait a while for it to finish.

Then run the following as necessary:

brew unlink opencv

Then run the following as the final step:

brew ln opencv3 --force

Now you should be able to run import cv2 no problem in a python 3.x script.

VB.NET - If string contains "value1" or "value2"

Here is the alternative solution to check whether a particular string contains some predefined string. It uses IndexOf Function:

'this is your string
Dim strMyString As String = "aaSomethingbb"

'if your string contains these strings
Dim TargetString1 As String = "Something"
Dim TargetString2 As String = "Something2"

If strMyString.IndexOf(TargetString1) <> -1 Or strMyString.IndexOf(TargetString2) <> -1 Then

End If

NOTE: This solution has been tested with Visual Studio 2010.

C# - Multiple generic types in one list

public abstract class Metadata

// extend abstract Metadata class
public class Metadata<DataType> : Metadata where DataType : struct
    private DataType mDataType;

Split string in Lua?

Here is my really simple solution. Use the gmatch function to capture strings which contain at least one character of anything other than the desired separator. The separator is **any* whitespace (%s in Lua) by default:

function mysplit (inputstr, sep)
        if sep == nil then
                sep = "%s"
        local t={}
        for str in string.gmatch(inputstr, "([^"..sep.."]+)") do
                table.insert(t, str)
        return t


Selecting all text in HTML text input when clicked

Well this is normal activity for a TextBox.

Click 1 - Set focus

Click 2/3 (double click) - Select text

You could set focus on the TextBox when the page first loads to reduce the "select" to a single double-click event.

Writing to a file in a for loop

It's preferable to use context managers to close the files automatically

with open("new.txt", "r"), open('xyz.txt', 'w') as textfile, myfile:
    for line in textfile:
        var1, var2 = line.split(",");

Can you have multiline HTML5 placeholder text in a <textarea>?

On most (see details below) browsers, editing the placeholder in javascript allows multiline placeholder. As it has been said, it's not compliant with the specification and you shouldn't expect it to work in the future (edit: it does work).

This example replaces all multiline textarea's placeholder.

var textAreas = document.getElementsByTagName('textarea');, function(elem) {
    elem.placeholder = elem.placeholder.replace(/\\n/g, '\n');
<textarea class="textAreaMultiline" 
          placeholder="Hello, \nThis is multiline example \n\nHave Fun"
          rows="5" cols="35"></textarea>

JsFiddle snippet.

Expected result

Expected result

Based on comments it seems some browser accepts this hack and others don't.
This is the results of tests I ran (with browsertshots and browserstack)

  • Chrome: >= 35.0.1916.69
  • Firefox: >= 35.0 (results varies on platform)
  • IE: >= 10
  • KHTML based browsers: 4.8
  • Safari: No (tested = Safari 8.0.6 Mac OS X 10.8)
  • Opera: No (tested <= 15.0.1147.72)

Fused with theses statistics, this means that it works on about 88.7% of currently (Oct 2015) used browsers.

Update: Today, it works on at least 94.4% of currently (July 2018) used browsers.

Multipart forms from C# client

Building on dnolans example, this is the version I could actually get to work (there were some errors with the boundary, encoding wasn't set) :-)

To send the data:

HttpWebRequest oRequest = null;
oRequest = (HttpWebRequest)HttpWebRequest.Create("");
oRequest.ContentType = "multipart/form-data; boundary=" + PostData.boundary;
oRequest.Method = "POST";
PostData pData = new PostData();
Encoding encoding = Encoding.UTF8;
Stream oStream = null;

/* ... set the parameters, read files, etc. IE:
   pData.Params.Add(new PostDataParam("email", "[email protected]", PostDataParamType.Field));
   pData.Params.Add(new PostDataParam("fileupload", "filename.txt", "filecontents" PostDataParamType.File));

byte[] buffer = encoding.GetBytes(pData.GetPostData());

oRequest.ContentLength = buffer.Length;

oStream = oRequest.GetRequestStream();
oStream.Write(buffer, 0, buffer.Length);

HttpWebResponse oResponse = (HttpWebResponse)oRequest.GetResponse();

The PostData class should look like:

public class PostData
    // Change this if you need to, not necessary
    public static string boundary = "AaB03x";

    private List<PostDataParam> m_Params;

    public List<PostDataParam> Params
        get { return m_Params; }
        set { m_Params = value; }

    public PostData()
        m_Params = new List<PostDataParam>();

    /// <summary>
    /// Returns the parameters array formatted for multi-part/form data
    /// </summary>
    /// <returns></returns>
    public string GetPostData()
        StringBuilder sb = new StringBuilder();
        foreach (PostDataParam p in m_Params)
            sb.AppendLine("--" + boundary);

            if (p.Type == PostDataParamType.File)
                sb.AppendLine(string.Format("Content-Disposition: file; name=\"{0}\"; filename=\"{1}\"", p.Name, p.FileName));
                sb.AppendLine("Content-Type: application/octet-stream");
                sb.AppendLine(string.Format("Content-Disposition: form-data; name=\"{0}\"", p.Name));

        sb.AppendLine("--" + boundary + "--");

        return sb.ToString();

public enum PostDataParamType

public class PostDataParam
    public PostDataParam(string name, string value, PostDataParamType type)
        Name = name;
        Value = value;
        Type = type;

    public PostDataParam(string name, string filename, string value, PostDataParamType type)
        Name = name;
        Value = value;
        FileName = filename;
        Type = type;

    public string Name;
    public string FileName;
    public string Value;
    public PostDataParamType Type;

Determine number of pages in a PDF file

Docotic.Pdf library may be used to accomplish the task.

Here is sample code:

PdfDocument document = new PdfDocument();
int pageCount = document.PageCount;

The library will parse as little as possible so performance should be ok.

Disclaimer: I work for Bit Miracle.

Prompt Dialog in Windows Forms

Based on the work of Bas Brekelmans above, I have also created two derivations -> "input" dialogs that allow you to receive from the user both a text value and a boolean (TextBox and CheckBox):

public static class PromptForTextAndBoolean
    public static string ShowDialog(string caption, string text, string boolStr)
        Form prompt = new Form();
        prompt.Width = 280;
        prompt.Height = 160;
        prompt.Text = caption;
        Label textLabel = new Label() { Left = 16, Top = 20, Width = 240, Text = text };
        TextBox textBox = new TextBox() { Left = 16, Top = 40, Width = 240, TabIndex = 0, TabStop = true };
        CheckBox ckbx = new CheckBox() { Left = 16, Top = 60, Width = 240, Text = boolStr };
        Button confirmation = new Button() { Text = "Okay!", Left = 16, Width = 80, Top = 88, TabIndex = 1, TabStop = true };
        confirmation.Click += (sender, e) => { prompt.Close(); };
        prompt.AcceptButton = confirmation;
        prompt.StartPosition = FormStartPosition.CenterScreen;
        return string.Format("{0};{1}", textBox.Text, ckbx.Checked.ToString());

...and text along with a selection of one of multiple options (TextBox and ComboBox):

public static class PromptForTextAndSelection
    public static string ShowDialog(string caption, string text, string selStr)
        Form prompt = new Form();
        prompt.Width = 280;
        prompt.Height = 160;
        prompt.Text = caption;
        Label textLabel = new Label() { Left = 16, Top = 20, Width = 240, Text = text };
        TextBox textBox = new TextBox() { Left = 16, Top = 40, Width = 240, TabIndex = 0, TabStop = true };
        Label selLabel = new Label() { Left = 16, Top = 66, Width = 88, Text = selStr };
        ComboBox cmbx = new ComboBox() { Left = 112, Top = 64, Width = 144 };
        cmbx.Items.Add("Dark Grey");
        Button confirmation = new Button() { Text = "In Ordnung!", Left = 16, Width = 80, Top = 88, TabIndex = 1, TabStop = true };
        confirmation.Click += (sender, e) => { prompt.Close(); };
        prompt.AcceptButton = confirmation;
        prompt.StartPosition = FormStartPosition.CenterScreen;
        return string.Format("{0};{1}", textBox.Text, cmbx.SelectedItem.ToString());

Both require the same usings:

using System;
using System.Windows.Forms;

Call them like so:

Call them like so:

PromptForTextAndBoolean.ShowDialog("Jazz", "What text should accompany the checkbox?", "Allow Scat Singing"); 

PromptForTextAndSelection.ShowDialog("Rock", "What should the name of the band be?", "Beret color to wear");

How can I add a vertical scrollbar to my div automatically?

You have to add max-height property.

    max-height: 150px;_x000D_
    overflow-y: scroll;_x000D_
<div class="ScrollStyle">_x000D_
  Scrollbar Test!<br/>_x000D_
  Scrollbar Test!<br/>_x000D_
  Scrollbar Test!<br/>_x000D_
  Scrollbar Test!<br/>_x000D_
  Scrollbar Test!<br/>_x000D_
  Scrollbar Test!<br/>_x000D_
  Scrollbar Test!<br/>_x000D_
  Scrollbar Test!<br/>_x000D_
  Scrollbar Test!<br/>_x000D_
  Scrollbar Test!<br/>_x000D_

Neither BindingResult nor plain target object for bean name available as request attr

I have encountered this problem as well. Here is my solution:

Below is the error while running a small Spring Application:-

*HTTP Status 500 - 
type Exception report
description The server encountered an internal error () that prevented it from fulfilling this request.
org.apache.jasper.JasperException: An exception occurred processing JSP page /WEB-INF/jsp/employe.jsp at line 12
9: <form:form method="POST" commandName="command"  action="/SpringWeb/addEmploye">
10:    <table>
11:     <tr>
12:         <td><form:label path="name">Name</form:label></td>
13:         <td><form:input path="name" /></td>
14:     </tr>
15:     <tr>
root cause 
java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name 'command' available as request attribute<init>(
note The full stack trace of the root cause is available in the Apache Tomcat/7.0.26 logs.*

In order to resolve this issue you need to do the following in the controller class:-

  1. Change the import package from "import org.springframework.web.portlet.ModelAndView;" to "import org.springframework.web.servlet.ModelAndView;"...
  2. Recompile and run the code... the problem should get resolved.

Close a MessageBox after several seconds

I did it like this

var owner = new Form { TopMost = true };
Task.Delay(30000).ContinueWith(t => {
owner.Invoke(new Action(()=>
      if (!owner.IsDisposed)
var dialogRes =  MessageBox.Show(owner, msg, "Info", MessageBoxButtons.YesNo, MessageBoxIcon.Information);

How to open a new tab using Selenium WebDriver

Almost all answers here are out of date.

(Ruby examples)

WebDriver now has support for opening tabs:

browser = Selenium::WebDriver.for :chrome
new_tab = browser.manage.new_window

Will open a new tab. Opening a window has actually become the non-standard case:


The tab or window will not automatically be focussed. To switch to it:

browser.switch_to.window new_tab

Visual Studio Code pylint: Unable to import 'protorpc'

I resolve this error by below step :

1 : first of all write this code in terminal :

...$ which python3

2 : Then :

"python.pythonPath": "/users/bin/python",


Python: Get the first character of the first string in a list?

Indexing in python starting from 0. You wrote [1:] this would not return you a first char in any case - this will return you a rest(except first char) of string.

If you have the following structure:

mylist = ['base', 'sample', 'test']

And want to get fist char for the first one string(item):

>>> b

If all first chars:

[x[0] for x in myList]
>>> ['b', 's', 't']    

If you have a text:

text = 'base sample test'
>>> b

Android SDK installation doesn't find JDK

I spent a little over an hour trying just about every option presented. I eventually figured out that I had a lot of stale entries for software that I had uninstalled. I deleted all the registry nodes that had any stale data (pointed to the wrong directory). This included the

[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\JavaSoft\Java Runtime Environment]


[HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Runtime Environment]

entries as a JRE included in the JDK.

I also got rid of all the JAVA entries in my environmental variables. I guess I blame it on bad uninstallers that do not clean up after themselves.

How can I make directory writable?

Execute at Admin privilege using sudo in order to avoid permission denied (Unable to change file mode) error.

sudo chmod 777 <directory location>

Enter key press behaves like a Tab in Javascript

I reworked the OPs solution into a Knockout binding and thought I'd share it. Thanks very much :-)

Here's a Fiddle

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "">
<html xmlns="" >
    <script src="" type="text/javascript"></script>
    <script src="" type="text/javascript"></script>


    <div data-bind="nextFieldOnEnter:true">
        <input type="text" />
        <input type="text" />
          <option value="volvo">Volvo</option>
          <option value="saab">Saab</option>
          <option value="mercedes">Mercedes</option>
          <option value="audi">Audi</option>
        <input type="text" />
        <input type="text" />

    <script type="text/javascript">
    ko.bindingHandlers.nextFieldOnEnter = {
        init: function(element, valueAccessor, allBindingsAccessor) {
            $(element).on('keydown', 'input, select', function (e) {
                var self = $(this)
                , form = $(element)
                  , focusable
                  , next
                if (e.keyCode == 13) {
                    focusable = form.find('input,a,select,button,textarea').filter(':visible');
                    var nextIndex = focusable.index(this) == focusable.length -1 ? 0 : focusable.index(this) + 1;
                    next = focusable.eq(nextIndex);
                    return false;


GUI-based or Web-based JSON editor that works like property explorer

Generally when I want to create a JSON or YAML string, I start out by building the Perl data structure, and then running a simple conversion on it. You could put a UI in front of the Perl data structure generation, e.g. a web form.

Converting a structure to JSON is very straightforward:

use strict;
use warnings;
use JSON::Any;

my $data = { arbitrary structure in here };
my $json_handler = JSON::Any->new(utf8=>1);
my $json_string = $json_handler->objToJson($data);

UINavigationBar custom back button without title

Set back button item title as empty String.

[self.navigationController.navigationBar.backItem setTitle:@""];

swift UITableView set rowHeight

func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
            var height:CGFloat = CGFloat()
            if indexPath.row == 1 {
                height = 150
            else {
                height = 50

            return height

Xcode 'CodeSign error: code signing is required'

Another possibility - When you Build for Archive make sure your Archive choice in your scheme is set for Distribution, not Release.

Go to Product -> Edit Scheme This brings up a new dialog.

Select Archive on the left. Make sure the build configuration is Distribution.

Counting the number of files in a directory using Java

Ah... the rationale for not having a straightforward method in Java to do that is file storage abstraction: some filesystems may not have the number of files in a directory readily available... that count may not even have any meaning at all (see for example distributed, P2P filesystems, fs that store file lists as a linked list, or database-backed filesystems...). So yes,

new File(<directory path>).list().length

is probably your best bet.

C++ compile error: has initializer but incomplete type

You need this include:

#include <sstream>

Bootstrap 3 modal vertical position center

This is responsive code and also open with different size in mobile view please check once.

.modal {
  text-align: center;
  padding: 0!important;

.modal:before {
  content: '';
  display: inline-block;
  height: 20%;
  vertical-align: middle;
  margin-right: -4px;

.modal-dialog {
  display: inline-block;
  text-align: left;
  vertical-align: middle;

Where to place JavaScript in an HTML file?

Putting the javascript at the top would seem neater, but functionally, its better to go after the HTML. That way, your javascript won't run and try to reference HTML elements before they are loaded. This sort of problem often only becomes apparent when you load the page over an actual internet connection, especially a slow one.

You could also try to dynamically load the javascript by adding a header element from other javascript code, although that only makes sense if you aren't using all of the code all the time.

How to make a round button?

For a round button create a shape:

<?xml version="1.0" encoding="utf-8"?>

    android:color="#FFFFFF" />

<solid android:color="#ffee82ee" />

    android:topRightRadius="45dp" />

use it as a background of your button link

ajax jquery simple get request

It seems to me, this is a cross-domain issue since you're not allowed to make a request to a different domain.

You have to find solutions to this problem: - Use a proxy script, running on your server that will forward your request and will handle the response sending it to the browser Or - The service you're making the request should have JSONP support. This is a cross-domain technique. You might want to read this

Configuring angularjs with eclipse IDE

With current Angular 4 and 5 versions, there is an IDE for that.

Go to eclipse market place any search for 'Angular'. You will see the IDE and install it.

enter image description here

After that restart eclipse and follow the welcome messages to choose preferences.

How to start using eclipse with angular projects?

Considering you already have angular project and you want to import it into eclipse.

go to file > import > choose Angular Project

enter image description here

and It would be better to have your projects in a separate working set so that you will not confuse it with other kind of (like java)projects.

With Angular IDE You will have a terminal window too.

To open this type terminal in eclipse search box(quick access) on the top right corner.

enter image description here

How to set up fixed width for <td>?

Use d-flex instead of row for "tr" in Bootstrap 4

The thing is that "row" class takes more width then the parent container, which introduces issues.

<table class="table">_x000D_
    <tr class="d-flex">_x000D_
      <td class="col-sm-8">Hello</td>_x000D_
      <td class="col-sm-4">World</td>_x000D_
    <tr class="d-flex">_x000D_
      <td class="col-sm-8">8 columns</td>_x000D_
      <td class="col-sm-4">4 columns</td>_x000D_

Git: How to squash all commits on branch

Based on reading several Stackoverflow questions and answers on squashing, I think this is a good one liner to squash all commits on a branch:

git reset --soft $(git merge-base master YOUR_BRANCH) && git commit -am "YOUR COMMIT MESSAGE" && git rebase -i master

This is assuming master is the base branch.

How do I mount a host directory as a volume in docker compose

Checkout their documentation

From the looks of it you could do the following on your docker-compose.yml

    - ./:/app

Where ./ is the host directory, and /app is the target directory for the containers.

Previous documentation source now leads to version history, you'll have to select the version of compose you're using and look for the reference.

For the lazy – v3 / v2 / v1

Side note: Syntax remains the same for all versions as of this edit

Start new Activity and finish current one in Android?

FLAG_ACTIVITY_NO_HISTORY when starting the activity you wish to finish after the user goes to another one.

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

The answer of @PaulDixon is completely wrong, because it removes the printable extended ASCII characters 128-255! has been partially corrected. I don't know why he still wants to delete 128-255 from a 127 chars 7-bit ASCII set as it does not have the extended ASCII characters.

But finally it was important not to delete 128-255 because for example chr(128) (\x80) is the euro sign in 8-bit ASCII and many UTF-8 fonts in Windows display a euro sign and Android regarding my own test.

And it will kill many UTF-8 characters if you remove the ASCII chars 128-255 from an UTF-8 string (probably the starting bytes of a multi-byte UTF-8 character). So don't do that! They are completely legal characters in all currently used file systems. The only reserved range is 0-31.

Instead use this to delete the non-printable characters 0-31 and 127:

$string = preg_replace('/[\x00-\x1F\x7F]/', '', $string);

It works in ASCII and UTF-8 because both share the same control set range.

The fastest slower¹ alternative without using regular expressions:

$string = str_replace(array(
    // control characters
    chr(0), chr(1), chr(2), chr(3), chr(4), chr(5), chr(6), chr(7), chr(8), chr(9), chr(10),
    chr(11), chr(12), chr(13), chr(14), chr(15), chr(16), chr(17), chr(18), chr(19), chr(20),
    chr(21), chr(22), chr(23), chr(24), chr(25), chr(26), chr(27), chr(28), chr(29), chr(30),
    // non-printing characters
), '', $string);

If you want to keep all whitespace characters \t, \n and \r, then remove chr(9), chr(10) and chr(13) from this list. Note: The usual whitespace is chr(32) so it stays in the result. Decide yourself if you want to remove non-breaking space chr(160) as it can cause problems.

¹ Tested by @PaulDixon and verified by myself.

Refresh Fragment at reload

You cannot reload the fragment while it is attached to an Activity, where you get "Fragment Already Added" exception.

So the fragment has to be first detached from its activity and then attached. All can be done using the fluent api in one line:


Update: This is to incorporate the changes made to API 26 and above:

FragmentTransaction transaction = mActivity.getFragmentManager()
                if (Build.VERSION.SDK_INT >= 26) {

For more description of the update please see

How to resolve compiler warning 'implicit declaration of function memset'

Try to add next define at start of your .c file:

#define _GNU_SOURCE

It helped me with pipe2 function.

C++, how to declare a struct in a header file

Try this new source :


#include <iostream>

struct Student {
    std::string lastName;
    std::string firstName;


#include "student.h"

struct Student student;

How to make function decorators and chain them together?

How can I make two decorators in Python that would do the following?

You want the following function, when called:

def say():
    return "Hello"

To return:


Simple solution

To most simply do this, make decorators that return lambdas (anonymous functions) that close over the function (closures) and call it:

def makeitalic(fn):
    return lambda: '<i>' + fn() + '</i>'

def makebold(fn):
    return lambda: '<b>' + fn() + '</b>'

Now use them as desired:

def say():
    return 'Hello'

and now:

>>> say()

Problems with the simple solution

But we seem to have nearly lost the original function.

>>> say
<function <lambda> at 0x4ACFA070>

To find it, we'd need to dig into the closure of each lambda, one of which is buried in the other:

>>> say.__closure__[0].cell_contents
<function <lambda> at 0x4ACFA030>
>>> say.__closure__[0].cell_contents.__closure__[0].cell_contents
<function say at 0x4ACFA730>

So if we put documentation on this function, or wanted to be able to decorate functions that take more than one argument, or we just wanted to know what function we were looking at in a debugging session, we need to do a bit more with our wrapper.

Full featured solution - overcoming most of these problems

We have the decorator wraps from the functools module in the standard library!

from functools import wraps

def makeitalic(fn):
    # must assign/update attributes from wrapped function to wrapper
    # __module__, __name__, __doc__, and __dict__ by default
    @wraps(fn) # explicitly give function whose attributes it is applying
    def wrapped(*args, **kwargs):
        return '<i>' + fn(*args, **kwargs) + '</i>'
    return wrapped

def makebold(fn):
    def wrapped(*args, **kwargs):
        return '<b>' + fn(*args, **kwargs) + '</b>'
    return wrapped

It is unfortunate that there's still some boilerplate, but this is about as simple as we can make it.

In Python 3, you also get __qualname__ and __annotations__ assigned by default.

So now:

def say():
    """This function returns a bolded, italicized 'hello'"""
    return 'Hello'

And now:

>>> say
<function say at 0x14BB8F70>
>>> help(say)
Help on function say in module __main__:

say(*args, **kwargs)
    This function returns a bolded, italicized 'hello'


So we see that wraps makes the wrapping function do almost everything except tell us exactly what the function takes as arguments.

There are other modules that may attempt to tackle the problem, but the solution is not yet in the standard library.

Set an environment variable in git bash

Creating a .bashrc file in your home directory also works. That way you don't have to copy your .bash_profile every time you install a new version of git bash.

Location Services not working in iOS 8

- (void)viewDidLoad
    [super viewDidLoad];
    self.locationManager = [[CLLocationManager alloc] init];
    self.locationManager.delegate = self;
    if([self.locationManager respondsToSelector:@selector(requestAlwaysAuthorization)]){
        NSUInteger code = [CLLocationManager authorizationStatus];
        if (code == kCLAuthorizationStatusNotDetermined && ([self.locationManager respondsToSelector:@selector(requestAlwaysAuthorization)] || [self.locationManager respondsToSelector:@selector(requestWhenInUseAuthorization)])) {
            // choose one request according to your business.
            if([[NSBundle mainBundle] objectForInfoDictionaryKey:@"NSLocationAlwaysUsageDescription"]){
                [self.locationManager requestAlwaysAuthorization];
            } else if([[NSBundle mainBundle] objectForInfoDictionaryKey:@"NSLocationWhenInUseUsageDescription"]) {
                [self.locationManager  requestWhenInUseAuthorization];
            } else {
                NSLog(@"Info.plist does not contain NSLocationAlwaysUsageDescription or NSLocationWhenInUseUsageDescription");
    [self.locationManager startUpdatingLocation];

>  #pragma mark - CLLocationManagerDelegate

    - (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error
        NSLog(@"didFailWithError: %@", error);
        UIAlertView *errorAlert = [[UIAlertView alloc]
                                   initWithTitle:@"Error" message:@"Failed to Get Your Location" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
        [errorAlert show];
    - (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
        NSLog(@"didUpdateToLocation: %@", newLocation);
        CLLocation *currentLocation = newLocation;
        if (currentLocation != nil) {
            longitudeLabel.text = [NSString stringWithFormat:@"%.8f", currentLocation.coordinate.longitude];
            latitudeLabel.text = [NSString stringWithFormat:@"%.8f", currentLocation.coordinate.latitude];

In iOS 8 you need to do two extra things to get location working: Add a key to your Info.plist and request authorization from the location manager asking it to start. There are two Info.plist keys for the new location authorization. One or both of these keys is required. If neither of the keys are there, you can call startUpdatingLocation but the location manager won’t actually start. It won’t send a failure message to the delegate either (since it never started, it can’t fail). It will also fail if you add one or both of the keys but forget to explicitly request authorization. So the first thing you need to do is to add one or both of the following keys to your Info.plist file:

  • NSLocationWhenInUseUsageDescription
  • NSLocationAlwaysUsageDescription

Both of these keys take a string

which is a description of why you need location services. You can enter a string like “Location is required to find out where you are” which, as in iOS 7, can be localized in the InfoPlist.strings file.

enter image description here

How to get data from Magento System Configuration

Magento 1.x

(magento 2 example provided below)

sectionName, groupName and fieldName are present in etc/system.xml file of the module.

PHP Syntax:


From within an editor in the admin, such as the content of a CMS Page or Static Block; the description/short description of a Catalog Category, Catalog Product, etc.

{{config path="sectionName/groupName/fieldName"}}

For the "Within an editor" approach to work, the field value must be passed through a filter for the {{ ... }} contents to be parsed out. Out of the box, Magento will do this for Category and Product descriptions, as well as CMS Pages and Static Blocks. However, if you are outputting the content within your own custom view script and want these variables to be parsed out, you can do so like this:

    $example = Mage::getModel('identifier/name')->load(1);
    $filter  = Mage::getModel('cms/template_filter');
    echo $filter->filter($example->getData('field'));

Replacing identifier/name with the a appropriate values for the model you are loading, and field with the name of the attribute you want to output, which may contain {{ ... }} occurrences that need to be parsed out.

Magento 2.x

From any Block class that extends \Magento\Framework\View\Element\AbstractBlock


Any other PHP class:

If the class (and none of it's parent's) does not inject \Magento\Framework\App\Config\ScopeConfigInterface via the constructor, you'll have to add it to your class.

// ... Remaining class definition above...

 * @var \Magento\Framework\App\Config\ScopeConfigInterface
protected $_scopeConfig;

 * Constructor
public function __construct(
    \Magento\Framework\App\Config\ScopeConfigInterface $scopeConfig
    // ...any other injected classes the class depends on...
) {
  $this->_scopeConfig = $scopeConfig;
  // Remaining constructor logic...

// ...remaining class definition below...

Once you have injected it into your class, you can now fetch store configuration values with the same syntax example given above for block classes.

Note that after modifying any class's __construct() parameter list, you may have to clear your generated classes as well as dependency injection directory: var/generation & var/di

can you host a private repository for your organization to use with npm?

A little late to the party, but NodeJS (as of ~Nov 14 I guess) supports corporate NPM repositories - you can find out more on their official site.

From a cursory glance it would appear that npmE allows fall-through mirroring of the NPM repository - that is, it will look up packages in the real NPM repository if it can't find one on your internal one. Seems very useful!

npm Enterprise is an on-premises solution for securely sharing and distributing JavaScript modules within your organization, from the team that maintains npm and the public npm registry. It's designed for teams that need:

easy internal sharing of private modules better control of development and deployment workflow stricter security around deploying open-source modules compliance with legal requirements to host code on-premises npmE is private npm

npmE is an npm registry that works with the same standard npm client you already use, but provides the features needed by larger organizations who are now enthusiastically adopting node. It's built by npm, Inc., the sponsor of the npm open source project and the host of the public npm registry.

Unfortunately, it's not free. You can get a trial, but it is commerical software. This is the not so great bit for solo developers, but if you're a solo developer, you have GitHub :-)

Convert char array to string use C

You're saying you have this:

char array[20]; char string[100];

And you'd like to have this:

string[0]= "178.9"; // where it was stored 178.9 position [0]

You can't have that. A char holds 1 character. That's it. A "string" in C is an array of characters followed by a sentinel character (NULL terminator).

Now if you want to copy the first x characters out of array to string you can do that with memcpy():

memcpy(string, array, x);
string[x] = '\0'; 

When 1 px border is added to div, Div size increases, Don't want to do that

You can do some fancy things with inset shadows. Example to put a border on the bottom of an element without changing its size:

.bottom-border {
  box-shadow:inset 0px -3px 0px #000;

Quick way to clear all selections on a multiselect enabled <select> with jQuery?

In javascript,

You can use the list of all options of multiselect dropdown which will be an Array.Then loop through it to make Selected attributes as false in each Objects.

for(var i=0;i<list.length;i++)

Getting an attribute value in xml element

Below is the code to do it in vtd-xml. It basically queries the XML with the XPath of "/xml/item/@name."

import com.ximpleware.*;

public class getAttrs{

   public static void main(String[] s) throws VTDException{
         VTDGen vg = new VTDGen();
         if (!vg.parseFile("input.xml",false)) // turn off namespace
         VTDNav vn = vg.getNav();
         AutoPilot ap =  new AutoPilot(vn);
         int i=0;
         while( (i=ap.evalXPath())!=-1){
              System.out.println(" item name is ===>"+vn.toString(i+1)); 

Laravel 5.5 ajax call 419 (unknown status)

Use this in the head section:

<meta name="csrf-token" content="{{ csrf_token() }}">

and get the csrf token in ajax:

  headers: {
    'X-CSRF-TOKEN': $('meta[name="csrf-token"]').attr('content')

Please refer Laravel Documentation csrf_token

How can I check if a checkbox is checked?

Use this below simple code:

<input type="checkbox" id="check">_x000D_
<a href="#" onclick="check()">click</a>_x000D_
<button onclick="check()">_x000D_
 function check() {_x000D_
      if (document.getElementById('check').checked) {_x000D_
        } else {_x000D_
            alert("You didn't check it! Let me check it for you.");_x000D_

python: How do I know what type of exception occurred?

You can start as Lauritz recommended, with:

except Exception as ex:

and then just to print ex like so:

    #your try code here
except Exception as ex:
    print ex

pyplot scatter plot marker size

This can be a somewhat confusing way of defining the size but you are basically specifying the area of the marker. This means, to double the width (or height) of the marker you need to increase s by a factor of 4. [because A = WH => (2W)(2H)=4A]

There is a reason, however, that the size of markers is defined in this way. Because of the scaling of area as the square of width, doubling the width actually appears to increase the size by more than a factor 2 (in fact it increases it by a factor of 4). To see this consider the following two examples and the output they produce.

# doubling the width of markers
x = [0,2,4,6,8,10]
y = [0]*len(x)
s = [20*4**n for n in range(len(x))]


enter image description here

Notice how the size increases very quickly. If instead we have

# doubling the area of markers
x = [0,2,4,6,8,10]
y = [0]*len(x)
s = [20*2**n for n in range(len(x))]


enter image description here

Now the apparent size of the markers increases roughly linearly in an intuitive fashion.

As for the exact meaning of what a 'point' is, it is fairly arbitrary for plotting purposes, you can just scale all of your sizes by a constant until they look reasonable.

Hope this helps!

Edit: (In response to comment from @Emma)

It's probably confusing wording on my part. The question asked about doubling the width of a circle so in the first picture for each circle (as we move from left to right) it's width is double the previous one so for the area this is an exponential with base 4. Similarly the second example each circle has area double the last one which gives an exponential with base 2.

However it is the second example (where we are scaling area) that doubling area appears to make the circle twice as big to the eye. Thus if we want a circle to appear a factor of n bigger we would increase the area by a factor n not the radius so the apparent size scales linearly with the area.

Edit to visualize the comment by @TomaszGandor:

This is what it looks like for different functions of the marker size:

Exponential, Square, or Linear size

x = [0,2,4,6,8,10,12,14,16,18]
s_exp = [20*2**n for n in range(len(x))]
s_square = [20*n**2 for n in range(len(x))]
s_linear = [20*n for n in range(len(x))]
plt.scatter(x,[1]*len(x),s=s_exp, label='$s=2^n$', lw=1)
plt.scatter(x,[0]*len(x),s=s_square, label='$s=n^2$')
plt.scatter(x,[-1]*len(x),s=s_linear, label='$s=n$')
plt.legend(loc='center left', bbox_to_anchor=(1.1, 0.5), labelspacing=3)

How to embed images in html email

I would strongly recommend using a library like PHPMailer to send emails.
It's easier and handles most of the issues automatically for you.

Regarding displaying embedded (inline) images, here's what's on their documentation:

Inline Attachments

There is an additional way to add an attachment. If you want to make a HTML e-mail with images incorporated into the desk, it's necessary to attach the image and then link the tag to it. For example, if you add an image as inline attachment with the CID my-photo, you would access it within the HTML e-mail with <img src="cid:my-photo" alt="my-photo" />.

In detail, here is the function to add an inline attachment:

$mail->AddEmbeddedImage(filename, cid, name);
//By using this function with this example's value above, results in this code:
$mail->AddEmbeddedImage('my-photo.jpg', 'my-photo', 'my-photo.jpg ');

To give you a more complete example of how it would work:

$mail = new PHPMailer(true); // the true param means it will throw exceptions on     errors, which we need to catch

$mail->IsSMTP(); // telling the class to use SMTP

try {
  $mail->Host       = ""; // SMTP server
  $mail->Port       = 25;                    // set the SMTP port
  $mail->SetFrom('[email protected]', 'First Last');
  $mail->AddAddress('[email protected]', 'John Doe');
  $mail->Subject = 'PHPMailer Test';

  $mail->AddEmbeddedImage("rocks.png", "my-attach", "rocks.png");
  $mail->Body = 'Your <b>HTML</b> with an embedded Image: <img src="cid:my-attach"> Here is an image!';

  $mail->AddAttachment(''); // this is a regular attachment (Not inline)
  echo "Message Sent OK<p></p>\n";
} catch (phpmailerException $e) {
  echo $e->errorMessage(); //Pretty error messages from PHPMailer
} catch (Exception $e) {
  echo $e->getMessage(); //Boring error messages from anything else!


Regarding your comment, you asked how to send HTML email with embedded images, so I gave you an example of how to do that.
The library I told you about can send emails using a lot of methods other than SMTP.
Take a look at the PHPMailer Example page for other examples.

One way or the other, if you don't want to send the email in the ways supported by the library, you can (should) still use the library to build the message, then you send it the way you want.

For example:

You can replace the line that send the email:


With this:

$mime_message = $mail->CreateBody(); //Retrieve the message content
echo $mime_message; // Echo it to the screen or send it using whatever method you want

Hope that helps. Let me know if you run into trouble using it.

Can jQuery read/write cookies to a browser?

A new jQuery plugin for cookie retrieval and manipulation with binding for forms, etc:

How to implement a SQL like 'LIKE' operator in java?

public static boolean like(String toBeCompare, String by){
    if(by != null){
        if(toBeCompare != null){
            if(by.startsWith("%") && by.endsWith("%")){
                int index = toBeCompare.toLowerCase().indexOf(by.replace("%", "").toLowerCase());
                if(index < 0){
                    return false;
                } else {
                    return true;
            } else if(by.startsWith("%")){
                return toBeCompare.endsWith(by.replace("%", ""));
            } else if(by.endsWith("%")){
                return toBeCompare.startsWith(by.replace("%", ""));
            } else {
                return toBeCompare.equals(by.replace("%", ""));
        } else {
            return false;
    } else {
        return false;

may be help you

Moment.js - How to convert date string into date?

Sweet and Simple!

Dec 4, 2020 4:58 PM


moment.locale();         // en
moment().format('LT');   // 4:59 PM
moment().format('LTS');  // 4:59:47 PM
moment().format('L');    // 12/08/2020
moment().format('l');    // 12/8/2020
moment().format('LL');   // December 8, 2020
moment().format('ll');   // Dec 8, 2020
moment().format('LLL');  // December 8, 2020 4:59 PM
moment().format('lll');  // Dec 8, 2020 4:59 PM
moment().format('LLLL'); // Tuesday, December 8, 2020 4:59 PM
moment().format('llll'); // Tue, Dec 8, 2020 4:59 PM

No appenders could be found for logger(log4j)?

The solution on this site worked for me I now see no warnings at all from log4j

I put this in a file that I put in src/main/resources

# This sets the global logging level and specifies the appenders
log4j.rootLogger=INFO, theConsoleAppender

# settings for the console appender
log4j.appender.theConsoleAppender.layout.ConversionPattern=%-4r [%t] %-5p %c %x - %m%n

JQuery Number Formatting

module.exports = function number_format (number, decimals, decPoint, thousandsSep) { // eslint-disable-enter code hereline camelcase
  //  discuss at:
  // original by: Jonas Raoni Soares Silva (
  // improved by: Kevin van Zonneveld (
  // improved by: davook
  // improved by: Brett Zamir (
  // improved by: Brett Zamir (
  // improved by: Theriault (
  // improved by: Kevin van Zonneveld (
  // bugfixed by: Michael White (
  // bugfixed by: Benjamin Lupton
  // bugfixed by: Allan Jensen (
  // bugfixed by: Howard Yeend
  // bugfixed by: Diogo Resende
  // bugfixed by: Rival
  // bugfixed by: Brett Zamir (
  //  revised by: Jonas Raoni Soares Silva (
  //  revised by: Luke Smith (
  //    input by: Kheang Hok Chin (
  //    input by: Jay Klehr
  //    input by: Amir Habibi (
  //    input by: Amirouche
  //   example 1: number_format(1234.56)
  //   returns 1: '1,235'
  //   example 2: number_format(1234.56, 2, ',', ' ')
  //   returns 2: '1 234,56'
  //   example 3: number_format(1234.5678, 2, '.', '')
  //   returns 3: '1234.57'
  //   example 4: number_format(67, 2, ',', '.')
  //   returns 4: '67,00'
  //   example 5: number_format(1000)
  //   returns 5: '1,000'
  //   example 6: number_format(67.311, 2)
  //   returns 6: '67.31'
  //   example 7: number_format(1000.55, 1)
  //   returns 7: '1,000.6'
  //   example 8: number_format(67000, 5, ',', '.')
  //   returns 8: '67.000,00000'
  //   example 9: number_format(0.9, 0)
  //   returns 9: '1'
  //  example 10: number_format('1.20', 2)
  //  returns 10: '1.20'
  //  example 11: number_format('1.20', 4)
  //  returns 11: '1.2000'
  //  example 12: number_format('1.2000', 3)
  //  returns 12: '1.200'
  //  example 13: number_format('1 000,50', 2, '.', ' ')
  //  returns 13: '100 050.00'
  //  example 14: number_format(1e-8, 8, '.', '')
  //  returns 14: '0.00000001'

  number = (number + '').replace(/[^0-9+\-Ee.]/g, '')
  var n = !isFinite(+number) ? 0 : +number
  var prec = !isFinite(+decimals) ? 0 : Math.abs(decimals)
  var sep = (typeof thousandsSep === 'undefined') ? ',' : thousandsSep
  var dec = (typeof decPoint === 'undefined') ? '.' : decPoint
  var s = ''

  var toFixedFix = function (n, prec) {
    if (('' + n).indexOf('e') === -1) {
      return +(Math.round(n + 'e+' + prec) + 'e-' + prec)
    } else {
      var arr = ('' + n).split('e')
      var sig = ''
      if (+arr[1] + prec > 0) {
        sig = '+'
      return (+(Math.round(+arr[0] + 'e' + sig + (+arr[1] + prec)) + 'e-' + prec)).toFixed(prec)

  // @todo: for IE parseFloat(0.55).toFixed(0) = 0;
  s = (prec ? toFixedFix(n, prec).toString() : '' + Math.round(n)).split('.')
  if (s[0].length > 3) {
    s[0] = s[0].replace(/\B(?=(?:\d{3})+(?!\d))/g, sep)
  if ((s[1] || '').length < prec) {
    s[1] = s[1] || ''
    s[1] += new Array(prec - s[1].length + 1).join('0')

  return s.join(dec)

How to make canvas responsive

this seems to be working :

  border: solid 1px blue; 

Can I run a 64-bit VMware image on a 32-bit machine?

If you have 32-bit hardware, no, you cannot run a 64-bit guest OS. "VMware software does not emulate an instruction set for different hardware not physically present".

However, QEMU can emulate a 64-bit processor, so you could convert the VMWare machine and run it with this

From this 2008-era blog post (mirrored by

$ cd /path/to/vmware/guestos
$ for i in \`ls *[0-9].vmdk\`; do qemu-img convert -f vmdk $i -O raw {i/vmdk/raw};done
$ cat *.raw >> guestos.img

To run it,

qemu -m 256 -hda guestos.img

The downside? Most of us runs VMware without preallocation space for the virtual disk. So, when we make a conversion from VMware to QEMU, the raw file will be the total space WITH preallocation. I am still testing with -f qcow format will it solve the problem or not. Such as:

for i in `ls *[0-9].vmdk`; do qemu-img convert -f vmdk $i -O qcow ${i/vmdk/qcow}; done && cat *.qcow >> debian.img

mysql_connect(): The mysql extension is deprecated and will be removed in the future: use mysqli or PDO instead

Simply put, you need to rewrite all of your database connections and queries.

You are using mysql_* functions which are now deprecated and will be removed from PHP in the future. So you need to start using MySQLi or PDO instead, just as the error notice warned you.

A basic example of using PDO (without error handling):

$db = new PDO('mysql:host=localhost;dbname=testdb;charset=utf8', 'username', 'password');
$result = $db->exec("INSERT INTO table(firstname, lastname) VAULES('John', 'Doe')");
$insertId = $db->lastInsertId();

A basic example of using MySQLi (without error handling):

$db = new mysqli($DBServer, $DBUser, $DBPass, $DBName);
$result = $db->query("INSERT INTO table(firstname, lastname) VAULES('John', 'Doe')");

Here's a handy little PDO tutorial to get you started. There are plenty of others, and ones about the PDO alternative, MySQLi.

"inappropriate ioctl for device"

I tried the following code that seemed to work:

if(open(my $FILE, "<File.txt")) {
    print "$_";}
} else {
    print "File could not be opened or did not exists\n";

Rounding to 2 decimal places in SQL

This works too. The below statement rounds to two decimal places.

SELECT ROUND(92.258,2) from dual;

Java Program to test if a character is uppercase/lowercase/number/vowel

This may not be what you are looking for but I thought you oughta know the real way to do this. You can use the java.lang.Character class's isUpperCase() to find aout about the case of the character. You can use isDigit() to differentiate between the numbers and letters(This is just FYI :) ). You can then do a toUpperCase() and then do the switch for vowels. This will improve your code quality.

What is the difference between signed and unsigned variables?

unsigned is used when ur value must be positive, no negative value here, if signed for int range -32768 to +32767 if unsigned for int range 0 to 65535

Convert an int to ASCII character

This will only work for int-digits 0-9, but your question seems to suggest that might be enough.

It works by adding the ASCII value of char '0' to the integer digit.

int i=6;
char c = '0'+i;  // now c is '6'

For example:

'0'+0 = '0'
'0'+1 = '1'
'0'+2 = '2'
'0'+3 = '3'


It is unclear what you mean, "work for alphabets"? If you want the 5th letter of the alphabet:

int i=5;
char c = 'A'-1 + i; // c is now 'E', the 5th letter.

Note that because in C/Ascii, A is considered the 0th letter of the alphabet, I do a minus-1 to compensate for the normally understood meaning of 5th letter.

Adjust as appropriate for your specific situation.
(and test-test-test! any code you write)

How to download and save an image in Android

Try this

                    Bitmap bmp = null;
                    URL url = new URL("Your_URL");
                    URLConnection conn = url.openConnection();
                    bmp = BitmapFactory.decodeStream(conn.getInputStream());
                    File f = new File(Environment.getExternalStorageDirectory(),System.currentTimeMillis() + ".jpg");
                    Bitmap bitmap = bmp;
                    ByteArrayOutputStream bos = new ByteArrayOutputStream();
                    bitmap.compress(Bitmap.CompressFormat.PNG, 0 /*ignored for PNG*/, bos);
                    byte[] bitmapdata = bos.toByteArray();
                    FileOutputStream fos = new FileOutputStream(f);
                    Log.e(TAG, "imagepath: "+f );
                catch (Exception e)

setTimeout or setInterval?

The setInterval makes it easier to cancel future execution of your code. If you use setTimeout, you must keep track of the timer id in case you wish to cancel it later on.

var timerId = null;
function myTimeoutFunction()
    timerId = setTimeout(myTimeoutFunction, 1000);


// later on...


function myTimeoutFunction()

var timerId = setInterval(myTimeoutFunction, 1000);

// later on...

Rebase array keys after unsetting elements

Use array_splice rather than unset:

$array = array(1,2,3,4,5);
foreach($array as $i => $info)
  if($info == 1 || $info == 2)
    array_splice($array, $i, 1);


Working sample here.

Add item to array in VBScript

Arrays are not very dynamic in VBScript. You'll have to use the ReDim Preserve statement to grow the existing array so it can accommodate an extra item:

ReDim Preserve yourArray(UBound(yourArray) + 1)
yourArray(UBound(yourArray)) = "Watermelons"

Add 10 seconds to a Date

I have a couple of new variants

  1. var t = new Date( + 10000);
  2. var t = new Date(+new Date() + 10000);

Shell Script — Get all files modified after <date>

well under linux try reading man page of the find command

man find

something like this should

 find . -type f -mtime -7 -print -exec cat {} \; | tar cf - | gzip -9

and you have it

.NET / C# - Convert char[] to string

char[] characters;
string s = new string(characters);

How to fetch FetchType.LAZY associations with JPA and Hibernate in a Spring Controller

You will have to make an explicit call on the lazy collection in order to initialize it (common practice is to call .size() for this purpose). In Hibernate there is a dedicated method for this (Hibernate.initialize()), but JPA has no equivalent of that. Of course you will have to make sure that the invocation is done, when the session is still available, so annotate your controller method with @Transactional. An alternative is to create an intermediate Service layer between the Controller and the Repository that could expose methods which initialize lazy collections.


Please note that the above solution is easy, but results in two distinct queries to the database (one for the user, another one for its roles). If you want to achieve better performace add the following method to your Spring Data JPA repository interface:

public interface PersonRepository extends JpaRepository<Person, Long> {

    @Query("SELECT p FROM Person p JOIN FETCH p.roles WHERE = (:id)")
    public Person findByIdAndFetchRolesEagerly(@Param("id") Long id);


This method will use JPQL's fetch join clause to eagerly load the roles association in a single round-trip to the database, and will therefore mitigate the performance penalty incurred by the two distinct queries in the above solution.

Simplest way to form a union of two lists

If it is a list, you can also use AddRange method.

var listB = new List<int>{3, 4, 5};  
var listA = new List<int>{1, 2, 3, 4, 5};

listA.AddRange(listB); // listA now has elements of listB also.

If you need new list (and exclude the duplicate), you can use Union

  var listB = new List<int>{3, 4, 5};  
  var listA = new List<int>{1, 2, 3, 4, 5};
  var listFinal = listA.Union(listB);

If you need new list (and include the duplicate), you can use Concat

  var listB = new List<int>{3, 4, 5};  
  var listA = new List<int>{1, 2, 3, 4, 5};
  var listFinal = listA.Concat(listB);

If you need common items, you can use Intersect.

var listB = new List<int>{3, 4, 5};  
var listA = new List<int>{1, 2, 3, 4};  
var listFinal = listA.Intersect(listB); //3,4

Create a 3D matrix

Create a 3D matrix

A = zeros(20, 10, 3);   %# Creates a 20x10x3 matrix

Add a 3rd dimension to a matrix

B = zeros(4,4);  
C = zeros(size(B,1), size(B,2), 4);  %# New matrix with B's size, and 3rd dimension of size 4
C(:,:,1) = B;                        %# Copy the content of B into C's first set of values

zeros is just one way of making a new matrix. Another could be A(1:20,1:10,1:3) = 0 for a 3D matrix. To confirm the size of your matrices you can run: size(A) which gives 20 10 3.

There is no explicit bound on the number of dimensions a matrix may have.

Error: Generic Array Creation

You can't create arrays with a generic component type.

Create an array of an explicit type, like Object[], instead. You can then cast this to PCB[] if you want, but I don't recommend it in most cases.

PCB[] res = (PCB[]) new Object[list.size()]; /* Not type-safe. */

If you want type safety, use a collection like java.util.List<PCB> instead of an array.

By the way, if list is already a java.util.List, you should use one of its toArray() methods, instead of duplicating them in your code. This doesn't get your around the type-safety problem though.

&& (AND) and || (OR) in IF statements

Java has 5 different boolean compare operators: &, &&, |, ||, ^

& and && are "and" operators, | and || "or" operators, ^ is "xor"

The single ones will check every parameter, regardless of the values, before checking the values of the parameters. The double ones will first check the left parameter and its value and if true (||) or false (&&) leave the second one untouched. Sound compilcated? An easy example should make it clear:

Given for all examples:

 String aString = null;


 if (aString != null & aString.equals("lala"))

Both parameters are checked before the evaluation is done and a NullPointerException will be thrown for the second parameter.

 if (aString != null && aString.equals("lala"))

The first parameter is checked and it returns false, so the second paramter won't be checked, because the result is false anyway.

The same for OR:

 if (aString == null | !aString.equals("lala"))

Will raise NullPointerException, too.

 if (aString == null || !aString.equals("lala"))

The first parameter is checked and it returns true, so the second paramter won't be checked, because the result is true anyway.

XOR can't be optimized, because it depends on both parameters.

Android splash screen image sizes to fit all devices

I have searched the best and the simplest answer to make 9-patch image. Now to make the 9 patch image is the easiest task.

From you can make a 9-patch image for all the resolutions - XHDPI,HDPI,MDPI,LDPI in just one click.

What is "loose coupling?" Please provide examples

I'll use Java as an example. Let's say we have a class that looks like this:

public class ABC
   public void doDiskAccess() {...}

When I call the class, I'll need to do something like this:

ABC abc = new ABC();

abc. doDiskAccess();

So far, so good. Now let's say I have another class that looks like this:

public class XYZ
   public void doNetworkAccess() {...}

It looks exactly the same as ABC, but let's say it works over the network instead of on disk. So now let's write a program like this:

if(config.isNetwork()) new XYZ().doNetworkAccess();
else new ABC().doDiskAccess();

That works, but it's a bit unwieldy. I could simplify this with an interface like this:

public interface Runnable
    public void run();

public class ABC implements Runnable
   public void run() {...}

public class XYZ implements Runnable
   public void run() {...}

Now my code can look like this:

Runnable obj = config.isNetwork() ? new XYZ() : new ABC();;

See how much cleaner and simpler to understand that is? We've just understood the first basic tenet of loose coupling: abstraction. The key from here is to ensure that ABC and XYZ do not depend on any methods or variables of the classes that call them. That allows ABC and XYZ to be completely independent APIs. Or in other words, they are "decoupled" or "loosely coupled" from the parent classes.

But what if we need communication between the two? Well, then we can use further abstractions like an Event Model to ensure that the parent code never needs to couple with the APIs you have created.

Javascript Equivalent to C# LINQ Select

Since you're using knockout, you should consider using the knockout utility function arrayMap() and it's other array utility functions.

Here's a listing of array utility functions and their equivalent LINQ methods:

arrayFilter() -> Where()
arrayFirst() -> First()
arrayForEach() -> (no direct equivalent)
arrayGetDistictValues() -> Distinct()
arrayIndexOf() -> IndexOf()
arrayMap() -> Select()
arrayPushAll() -> (no direct equivalent)
arrayRemoveItem() -> (no direct equivalent)
compareArrays() -> (no direct equivalent)

So what you could do in your example is this:

var mapped = ko.utils.arrayMap(selectedFruits, function (fruit) {

If you want a LINQ like interface in javascript, you could use a library such as linq.js which offers a nice interface to many of the LINQ methods.

var mapped = Enumerable.From(selectedFruits)
    .Select("$.id") // 1 of 3 different ways to specify a selector function

Load text file as strings using numpy.loadtxt()

Use genfromtxt instead. It's a much more general method than loadtxt:

import numpy as np
print np.genfromtxt('col.txt',dtype='str')

Using the file col.txt:

foo bar
cat dog
man wine

This gives:

[['foo' 'bar']
 ['cat' 'dog']
 ['man' 'wine']]

If you expect that each row has the same number of columns, read the first row and set the attribute filling_values to fix any missing rows.

Eclipse will not open due to environment variables

First uninstall all java software like JRE 7 or JRE 6 or JDK ,then open the following path :


Then click on Edit button and paste the following text to Variable_Value and click OK.

C:\Program Files\Common Files\Microsoft Shared\Windows Live;C:\Program Files (x86)\Common Files\Microsoft Shared\Windows Live;%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem;%SYSTEMROOT%\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\Microsoft SQL Server\90\Tools\binn\;C:\Program Files (x86)\Common Files\Roxio Shared\DLLShared\;C:\Program Files (x86)\Windows Live\Shared;C:\Program Files (x86)\Microsoft SQL Server\100\Tools\Binn\VSShell\Common7\IDE\;C:\Program Files (x86)\Microsoft SQL Server\100\Tools\Binn\;C:\Program Files\Microsoft SQL Server\100\Tools\Binn\;C:\Program Files (x86)\Microsoft SQL Server\100\DTS\Binn\

Now go to this url and click on Windows Offline and click on run and start again eclipse.

Enjoy it!

Email address validation using ASP.NET MVC data type attributes

As per the above this will fix server side validation of an Email Address:

[Display(Name = "Email address")]
[Required(ErrorMessage = "The email address is required")]
[EmailAddress(ErrorMessage = "Invalid Email Address")]
public string Email { get; set; }


If you are using JQuery client side validation you should know that the Email validates differently server side (model validation) to client side (JQuery validation). In that test@example (a top level domain email address) would fail server side but would validate fine on the client side.

To fix this disparity you can override the default client side email validation as follows:

$ = function (value, element) {
    return this.optional(element) || /^[a-z0-9._]+@[a-z]+\.[a-z.]+/.test(value);

Catch multiple exceptions at once?

Not in C# unfortunately, as you'd need an exception filter to do it and C# doesn't expose that feature of MSIL. VB.NET does have this capability though, e.g.

Catch ex As Exception When TypeOf ex Is FormatException OrElse TypeOf ex Is OverflowException

What you could do is use an anonymous function to encapsulate your on-error code, and then call it in those specific catch blocks:

Action onError = () => WebId = Guid.Empty;
    // something
catch (FormatException)
catch (OverflowException)

How to find out client ID of component for ajax update/render? Cannot find component with expression "foo" referenced from "bar"

Try change update="insTable:display" to update="display". I believe you cannot prefix the id with the form ID like that.

What is the purpose of XSD files?

An XSD is a formal contract that specifies how an XML document can be formed. It is often used to validate an XML document, or to generate code from.

How to store a datetime in MySQL with timezone info

I once also faced such an issue where i needed to save data which was used by different collaborators and i ended up storing the time in unix timestamp form which represents the number of seconds since january 1970 which is an integer format. Example todays date and time in tanzania is Friday, September 13, 2019 9:44:01 PM which when store in unix timestamp would be 1568400241

Now when reading the data simply use something like php or any other language and extract the date from the unix timestamp. An example with php will be

echo date('m/d/Y', 1568400241);

This makes it easier even to store data with other collaborators in different locations. They can simply convert the date to unix timestamp with their own gmt offset and store it in a integer format and when outputting this simply convert with a

Using two values for one switch case statement

JEP 354: Switch Expressions (Preview) in JDK-13 and JEP 361: Switch Expressions (Standard) in JDK-14 will extend the switch statement so it can be used as an expression.

Now you can:

  • directly assign variable from switch expression,
  • use new form of switch label (case L ->):

    The code to the right of a "case L ->" switch label is restricted to be an expression, a block, or (for convenience) a throw statement.

  • use multiple constants per case, separated by commas,
  • and also there are no more value breaks:

    To yield a value from a switch expression, the break with value statement is dropped in favor of a yield statement.

So the demo from one of the answers might look like this:

public class SwitchExpression {

  public static void main(String[] args) {
      int month = 9;
      int year = 2018;
      int numDays = switch (month) {
        case 1, 3, 5, 7, 8, 10, 12 -> 31;
        case 4, 6, 9, 11 -> 30;
        case 2 -> {
          if (java.time.Year.of(year).isLeap()) {
            System.out.println("Wow! It's leap year!");
            yield 29;
          } else {
            yield 28;
        default -> {
          System.out.println("Invalid month.");
          yield 0;
      System.out.println("Number of Days = " + numDays);

.rar, .zip files MIME Type

In a linked question, there's some Objective-C code to get the mime type for a file URL. I've created a Swift extension based on that Objective-C code to get the mime type:

import Foundation
import MobileCoreServices

extension URL {
    var mimeType: String? {
        guard self.pathExtension.count != 0 else {
            return nil

        let pathExtension = self.pathExtension as CFString
        if let preferredIdentifier = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, pathExtension, nil) {
            guard let mimeType = UTTypeCopyPreferredTagWithClass(preferredIdentifier.takeRetainedValue(), kUTTagClassMIMEType) else {
                return nil
            return mimeType.takeRetainedValue() as String

        return nil

CSS selector for a checked radio button's label


This only worked for me because our existing generated html was wacky, generating labels along with radios and giving them both checked attribute.

Never mind, and big ups for Brilliand for bringing it up!

If your label is a sibling of a checkbox (which is usually the case), you can use the ~ sibling selector, and a label[for=your_checkbox_id] to address it... or give the label an id if you have multiple labels (like in this example where I use labels for buttons)

Came here looking for the same - but ended up finding my answer in the docs.

a label element with checked attribute can be selected like so:

label[checked] {

I know it's an old question, but maybe it helps someone out there :)

Bad Request - Invalid Hostname IIS7

I'm not sure if this was your problem but for anyone that's trying to access his web application from his machine and having this problem:

Make sure you're connecting to (a.k.a localhost) and not to your external IP address.

Your URL should be something like http://localhost:8181/ or and not http://YourExternalIPaddress:8181/.

Additional information:
The reason this works is because your firewall may block your own request. It can be a firewall on your OS and it can be (the usual) your router.

When you connect to your external IP address, you connect to you from the internet, as if you were a stranger (or a hacker).
However when you connect to your localhost, you connect locally as yourself and the block is obviously not needed (& avoided altogether).

Accessing members of items in a JSONArray with Java

An org.json.JSONArray is not iterable.
Here's how I process elements in a net.sf.json.JSONArray:

    JSONArray lineItems = jsonObject.getJSONArray("lineItems");
    for (Object o : lineItems) {
        JSONObject jsonLineItem = (JSONObject) o;
        String key = jsonLineItem.getString("key");
        String value = jsonLineItem.getString("value");

Works great... :)

How do I wrap text in a pre tag?

The following helped me:

pre {
    white-space: normal;
    word-wrap: break-word;


When to use HashMap over LinkedList or ArrayList and vice-versa

The downfall of ArrayList and LinkedList is that when iterating through them, depending on the search algorithm, the time it takes to find an item grows with the size of the list.

The beauty of hashing is that although you sacrifice some extra time searching for the element, the time taken does not grow with the size of the map. This is because the HashMap finds information by converting the element you are searching for, directly into the index, so it can make the jump.

Long story short... LinkedList: Consumes a little more memory than ArrayList, low cost for insertions(add & remove) ArrayList: Consumes low memory, but similar to LinkedList, and takes extra time to search when large. HashMap: Can perform a jump to the value, making the search time constant for large maps. Consumes more memory and takes longer to find the value than small lists.

DETERMINISTIC, NO SQL, or READS SQL DATA in its declaration and binary logging is enabled

Try setting the definer for the function!

So instead of

CREATE FUNCTION get_pet_owner

you will write something akin to

CREATE DEFINER=procadmin@% FUNCTION get_pet_owner

which ought to work if the user prodacmin has rights to create functions/procedures.

In my case the function worked when generated through MySQL Workbench but did not work when run directly as an SQL script. Making the changes above fixed the problem.

NSDictionary - Need to check whether dictionary contains key-value pair or not

Just ask it for the objectForKey:@"b". If it returns nil, no object is set at that key.

if ([xyz objectForKey:@"b"]) {
    NSLog(@"There's an object set for key @\"b\"!");
} else {
    NSLog(@"No object set for key @\"b\"");

Edit: As to your edited second question, it's simply NSUInteger mCount = [xyz count];. Both of these answers are documented well and easily found in the NSDictionary class reference ([1] [2]).

How to concatenate strings in twig

Also a little known feature in Twig is string interpolation:

{{ "http://#{}" }}

How to convert String object to Boolean Object?

Well, as now in Jan, 2018, the best way for this is to use apache's BooleanUtils.toBoolean.

This will convert any boolean like string to boolean, e.g. Y, yes, true, N, no, false, etc.

Really handy!

How do I pass along variables with XMLHTTPRequest

Following is correct way:"GET","getuser.php?fname="+abc ,true);

How do I vertically align text in a paragraph?

User vertical-align: middle; along with text-align: center property

<!DOCTYPE html>
.center {
  border: 3px solid green;
  text-align: center;

.center p {
  display: inline-block;
  vertical-align: middle;

<p>In this example, we use the line-height property with a value that is equal to the height property to center the div element:</p>

<div class="center">
  <p>I am vertically and horizontally centered.</p>


How to get ID of the last updated row in MySQL?

Query :

$sqlQuery = "UPDATE 
            set_name = 'value' 
            where_name = 'name'
        LIMIT 1;";

PHP function:

function updateAndGetId($sqlQuery)
    mysql_query(str_replace("SET", "SET id = LAST_INSERT_ID(id),", $sqlQuery));
    return mysql_insert_id();

It's work for me ;)

Node.js Web Application examples/tutorials

The closest thing is likely Dav Glass's experimental work using node.js, express and YUI3. Basically, he explains how YUI3 is used to render markup on the server side, then sent to the client where binding to event and data occurs. The beauty is YUI3 is used as-is on both the client and the server. Makes a lot of sense. The one big issue is there is not yet a production ready server-side DOM library.


How do I hide anchor text without hiding the anchor?

Wrap the text in a span and set visibility:hidden; Visibility hidden will hide the element but it will still take up the same space on the page (conversely display: none removes it from the page as well).

applying css to specific li class

You have specified different colors for the li elements but it is being overridden by the specified color in the a within the li. Remove color: #C1C1C1; style from a element and it should work.

How do I count unique items in field in Access query?

Try this

SELECT Count(*) AS N

Read this for more info.

Why doesn't Mockito mock static methods?

I seriously do think that it is code smell if you need to mock static methods, too.

  • Static methods to access common functionality? -> Use a singleton instance and inject that
  • Third party code? -> Wrap it into your own interface/delegate (and if necessary make it a singleton, too)

The only time this seems overkill to me, is libs like Guava, but you shouldn't need to mock this kind anyway cause it's part of the logic... (stuff like Iterables.transform(..))
That way your own code stays clean, you can mock out all your dependencies in a clean way, and you have an anti corruption layer against external dependencies. I've seen PowerMock in practice and all the classes we needed it for were poorly designed. Also the integration of PowerMock at times caused serious problems

PS: Same holds for private methods, too. I don't think tests should know about the details of private methods. If a class is so complex that it tempts to mock out private methods, it's probably a sign to split up that class...

Convert bytes to bits in python

Here how to do it using format()

print "bin_signedDate : ", ''.join(format(x, '08b') for x in bytevector)

It is important the 08b . That means it will be a maximum of 8 leading zeros be appended to complete a byte. If you don't specify this then the format will just have a variable bit length for each converted byte.

how to hide <li> bullets in navigation menu and footer links BUT show them for listing items

You can style li elements differently based on their class, their id or their ancestor elements:

li { /* styles all li elements*/
    list-style-type: none;

#ParentListID li { /* styles the li elements that have an ancestor element
                      of id="ParentListID" */
    list-style-type: bullet;

li.className { /* styles li elements of class="className" */
    list-style-type: bullet;

Or, to use the ancestor elements:

#navigationContainerID li { /* specifically styles the li elements with an ancestor of
                               id="navigationContainerID" */
    list-style-type: none;

li { /* then styles all other li elements that don't have that ancestor element */
    list-style-type: bullet;

How to kill all processes matching a name?

try kill -s 9 `ps -ef |grep "Nov 11" |grep -v grep | awk '{print $2}'` To kill processes of November 11 or kill -s 9 `ps -ef |grep amarok|grep -v grep | awk '{print $2}'` To kill processes that contain the word amarok

how to convert a string to an array in php

here, Use explode() function to convert string into array, by a string

click here to know more about explode()

$str = "this is string";
$delimiter = ' ';  // use any string / character by which, need to split string into Array
$resultArr = explode($delimiter, $str);  

Output :

    [0] => "this",
    [1] => "is",
    [2] => "string "

it is same as the requirements:


The Android emulator is not starting, showing "invalid command-line parameter"

I started Task Manager, made sure adb.exe is closed (it locks some files)

Create the folder C:\Android Moved folder + all files from C:\Program Files\android-sdk to C:\Android

Edited C:\Documents and Settings\All Users\Start Menu\Programs\Android SDK Tools shortcuts.

I considered uninstalling the SDK and re-installing, but for the life of me, where does it store the temp files?? I don't want to re-download the platforms, samples and doco that I have added to the SDK.

Extract Data from PDF and Add to Worksheet

I know this is an old issue but I just had to do this for a project at work, and I am very surprised that nobody has thought of this solution yet: Just open the .pdf with Microsoft word.

The code is a lot easier to work with when you are trying to extract data from a .docx because it opens in Microsoft Word. Excel and Word play well together because they are both Microsoft programs. In my case, the file of question had to be a .pdf file. Here's the solution I came up with:

  1. Choose the default program to open .pdf files to be Microsoft Word
  2. The first time you open a .pdf file with word, a dialogue box pops up claiming word will need to convert the .pdf into a .docx file. Click the check box in the bottom left stating "do not show this message again" and then click OK.
  3. Create a macro that extracts data from a .docx file. I used MikeD's Code as a resource for this.
  4. Tinker around with the MoveDown, MoveRight, and Find.Execute methods to fit the need of your task.

Yes you could just convert the .pdf file to a .docx file but this is a much simpler solution in my opinion.

What reference do I need to use Microsoft.Office.Interop.Excel in .NET?

1.Download and install: Microsoft Office Developer Tools

2.Add references from:

C:\Program Files (x86)\Microsoft Visual Studio 11.0\Visual Studio Tools for Office\PIA\Office15

Built in Python hash() function

This is the hash function that Google uses in production for python 2.5:

def c_mul(a, b):
  return eval(hex((long(a) * b) & (2**64 - 1))[:-1])

def py25hash(self):
  if not self:
    return 0 # empty
  value = ord(self[0]) << 7
  for char in self:
    value = c_mul(1000003, value) ^ ord(char)
  value = value ^ len(self)
  if value == -1:
    value = -2
  if value >= 2**63:
    value -= 2**64
  return value

iptables LOG and DROP in one rule

for china GFW:

sudo iptables -I INPUT -s -p tcp --tcp-flags RST RST -j DROP
sudo iptables -I INPUT -s -p tcp --tcp-flags RST RST -j LOG --log-prefix "drop rst"

sudo iptables -I INPUT -s -p tcp --tcp-flags RST RST -j DROP
sudo iptables -I INPUT -s -p tcp --tcp-flags RST RST -j LOG --log-prefix "drop rst"

sudo iptables -I INPUT -s -p tcp --tcp-flags RST RST -j DROP
sudo iptables -I INPUT -s -p tcp --tcp-flags RST RST -j LOG --log-prefix "drop rst"

Why are primes important in cryptography?

Here is a very simple and common example.

The RSA encryption algorithm which is commonly used in secure commerce web sites, is based on the fact that it is easy to take two (very large) prime numbers and multiply them, while it is extremely hard to do the opposite - meaning: take a very large number, given which it has only two prime factors, and find them.

How to read line by line of a text area HTML tag

This works without needing jQuery:

var textArea = document.getElementById("my-text-area");
var arrayOfLines = textArea.value.split("\n"); // arrayOfLines is array where every element is string of one line

How to clear or stop timeInterval in angularjs?

When you want to create interval store promise to variable:

var p = $interval(function() { ... },1000);

And when you want to stop / clear the interval simply use:


mysql count group by having

One way would be to use a nested query:

SELECT count(*)
   SELECT COUNT(Genre) AS count
   FROM movies
   HAVING (count = 4)
) AS x

The inner query gets all the movies that have exactly 4 genres, then outer query counts how many rows the inner query returned.