 	<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
	var popupInstance = null;

<input type="text" id="txtExample" onclick="popup.show(25, 0, 100, 50, this, event);" />
function createCrossBrowserPopup(){
    return new _popup();
}

function _popup() {
    this.wnd = null;
    this.hiddenFrame = null; //workaround for IE 6 - with divs and select (divs are appearing behind select elements)
    this.showHiddenFrame = showHiddenFrame;
    this.displayPopupContainer = displayPopupContainer;
    this.html = "";
    this.setHTML = _setHTML;
    this.show = _show;
    this.hide = _hide;
    this.triggerElementId = null;
    this.blur = null;
}

function _setHTML(html, event) {
    this.html = html;
    if (this.wnd != null) {
        this.wnd.html(this.html);
    }

    if (event != null)
        stopEventPropagation(event, null);
}

/// leftOffset: the left offset of the popup
/// topOffset: the top offset of the popup
/// width: the width of the popup
/// height: the height of the popup
/// element: the element which causes the popup to be opened
/// event: the event which cased the popup to be opened
function _show(leftOffset, topOffset, width, height, element, event) {

         // Hide previous popup if existed
    if (popupInstance != null && element.id != popupInstance.triggerElementId) {
        popupInstance.hide();
        return;
    }

    // if popupInstance != null this means that the same popup was called, makes no sense to create it again
    if (popupInstance == null){
        leftOffset = leftOffset != null ? leftOffset : 0;
        topOffset = topOffset != null ? topOffset : 0;

        this.displayPopupContainer(element, width, height, leftOffset, topOffset);

        //workaround for IE 6 - with divs and select (divs are appearing behind select elements)
        this.showHiddenFrame(element, width, height, leftOffset, topOffset);
        // end of workaround

        setElementsPosition(element, leftOffset, topOffset);

        // save the id, onblur event of the element that fires the popup
        // and also save the instance of this object - for $(document).click and $(window).resize
        this.triggerElementId = element.id;
        this.blur = element.onblur;
        element.onblur = null;
        popupInstance = this;
    }

    stopEventPropagation(event);
}

function _hide() {
    $(".modal_popup_container").hide();
    if (this.triggerElementId != null) {
        // Assign back the blur event (using simple Javascript, not jQuery as it is causing onblur to be fired 2 times) and reset some variables
        $('#' + this.triggerElementId)[0].onblur = this.blur;
        if ($.isFunction(this.blur)) {
            $('#' + this.triggerElementId)[0].onblur();
        }
        else
        if(typeof(this.blur) == 'string')
        {
            var regex = new RegExp('(?=[\w.])this(?!\w)/g');
            eval(this.blur.replace(regex, '$(\'#' + this.triggerElementId + '\')[0]'));
        }

        // reset variables
        this.triggerElementId = null;
        this.blur = null;
        popupInstance = null;
    }
}

function displayPopupContainer(element, width, height, leftOffset, topOffset) {
    if (this.wnd == null) {
        this.wnd = $('<div />');
        this.wnd.addClass('modal_popup_container');
        this.wnd.css({
                'position' : 'absolute',
                'z-index' : '999',
                'margin' : '0'});
    }

    this.wnd.css({ 'width': width, 'height': height });
    this.wnd.html(this.html);
    this.wnd.show();

    var parentElement = $(element).parent();
    $(parentElement).append(this.wnd);
}

function showHiddenFrame(element, width, height, leftOffset, topOffset) {
    if (this.hiddenFrame == null) {
        this.hiddenFrame = $('<iframe />');
        this.hiddenFrame.addClass('modal_popup_container');

        this.hiddenFrame.attr({
            "src": "javascript:'&lt;html&gt;&lt;/html&gt;';",
            "scrolling": "no",
            "frameborder": 0
        });
        this.hiddenFrame.css({
            "position": "absolute",
            "border": "none",
            "display": "block",
            "z-index": "998",
            "margin": "0"
        });
    }

    this.hiddenFrame.css({ "width": width, "height": height });
    this.hiddenFrame.show();

    var parentElement = $(element).parent();
    $(parentElement).append(this.hiddenFrame);
}

function setElementsPosition(element, leftOffset, topOffset) {
    $(".modal_popup_container").position({
        my: "left top",
        at: "left bottom",
        of: $(element),
        offset: leftOffset + " " + topOffset,
        collision: "fit"
    });
}

function stopEventPropagation(event)
{
    // manage FireFox and IE events, check if event was passed, else try and get window.event
    var e = (!event) ? window.event : event;
    // avoid that the current click event propagates up
    if (typeof (e) != "undefined") {
        if (e.stopPropagation)
            e.stopPropagation();
        else e.cancelBubble = true;
    }
}

// hide the popup when user clicks outside it
$(document).click(
    function(event) {
        if ($(event.target).closest('.modal_popup_container').get(0) == null
        && popupInstance != null) {
            popupInstance.hide();
        }
    });

$(window).resize(
    function(event) {
        if (popupInstance != null) {
            popupInstance.hide();
        }
    });
	
	<scriptlanguage="javascript" type="text/javascript">
...
 var popup = createCrossBrowserPopup();
 popup.setHTML("<div style='width:100%; height:100%;
background-color:#AAFFEE;border-width: 2px; border-color: silver; border-style:
solid;' onclick='changePopupHTML();'> test </div>", null);

function changePopupHTML() {
    popup.setHTML("<div style='width:100%; height:100%; background-color:#AA11EE;border-width: 2px; border-color: silver; border-style: solid;'> test222 </div>", null);
}
...

</script>


<input type="text" id="txtExample" onclick="popup.show(25, 0, 100, 50, this, event);" />

created 3 years ago

Javascript Online Compiler

Write, Run & Share Javascript code online using OneCompiler's JS online compiler for free. It's one of the robust, feature-rich online compilers for Javascript language. Getting started with the OneCompiler's Javascript editor is easy and fast. The editor shows sample boilerplate code when you choose language as Javascript and start coding.

About Javascript

Javascript(JS) is a object-oriented programming language which adhere to ECMA Script Standards. Javascript is required to design the behaviour of the web pages.

Key Features

Open-source
Just-in-time compiled language
Embedded along with HTML and makes web pages alive
Originally named as LiveScript.
Executable in both browser and server which has Javascript engines like V8(chrome), SpiderMonkey(Firefox) etc.

Syntax help

STDIN Example

var readline = require('readline');
var rl = readline.createInterface({
  input: process.stdin,
  output: process.stdout,
  terminal: false
});

rl.on('line', function(line){
    console.log("Hello, " + line);
});

variable declaration

Keyword	Description	Scope
var	Var is used to declare variables(old way of declaring variables)	Function or global scope
let	let is also used to declare variables(new way)	Global or block Scope
const	const is used to declare const values. Once the value is assigned, it can not be modified	Global or block Scope

Backtick Strings

Interpolation

let greetings = `Hello ${name}`

Multi line Strings

const msg = `
hello
world!
`

Arrays

An array is a collection of items or values.

Syntax:

let arrayName = [value1, value2,..etc];
// or
let arrayName = new Array("value1","value2",..etc);

Example:

let mobiles = ["iPhone", "Samsung", "Pixel"];

// accessing an array
console.log(mobiles[0]);

// changing an array element
mobiles[3] = "Nokia";

Arrow functions

Arrow Functions helps developers to write code in concise way, it’s introduced in ES6.
Arrow functions can be written in multiple ways. Below are couple of ways to use arrow function but it can be written in many other ways as well.

Syntax:

() => expression

Example:

const numbers = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
const squaresOfEvenNumbers = numbers.filter(ele => ele % 2 == 0)
                                    .map(ele => ele ** 2);
console.log(squaresOfEvenNumbers);

De-structuring

Arrays

let [firstName, lastName] = ['Foo', 'Bar']

Objects

let {firstName, lastName} = {
  firstName: 'Foo',
  lastName: 'Bar'
}

rest(...) operator

 const {
    title,
    firstName,
    lastName,
    ...rest
  } = record;

Spread(...) operator

//Object spread
const post = {
  ...options,
  type: "new"
}
//array spread
const users = [
  ...adminUsers,
  ...normalUsers
]

Functions

function greetings({ name = 'Foo' } = {}) { //Defaulting name to Foo
  console.log(`Hello ${name}!`);
}
 
greet() // Hello Foo
greet({ name: 'Bar' }) // Hi Bar

Loops

1. If:

IF is used to execute a block of code based on a condition.

Syntax

if(condition){
    // code
}

2. If-Else:

Else part is used to execute the block of code when the condition fails.

Syntax

if(condition){
    // code
} else {
    // code
}

3. Switch:

Switch is used to replace nested If-Else statements.

Syntax

switch(condition){
    case 'value1' :
        //code
        [break;]
    case 'value2' :
        //code
        [break;]
    .......
    default :
        //code
        [break;]
}

4. For

For loop is used to iterate a set of statements based on a condition.

for(Initialization; Condition; Increment/decrement){  
//code  
}

5. While

While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.

while (condition) {  
  // code 
}

6. Do-While

Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.

do {  
  // code 
} while (condition);

Classes

ES6 introduced classes along with OOPS concepts in JS. Class is similar to a function which you can think like kind of template which will get called when ever you initialize class.

Syntax:

class className {
  constructor() { ... } //Mandatory Class method
  method1() { ... }
  method2() { ... }
  ...
}

Example:

class Mobile {
  constructor(model) {
    this.name = model;
  }
}

mbl = new Mobile("iPhone");