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How to use Javascript localStorage to retain values of HTML input elements on Page Refresh? localStorage in Javascript is used to retain the values of the HTML input elements on the page refresh. setItem() and getItem() methods are used to set and get the data from the localStorage. clear() method is used to clear the data from the localStorage. Suppose I have following 2 textboxes and buttons in my HTML page.  <input type="text" id="text1" value="" /> <button type="button" id="myButton1" onclick="myButtonClicked('text1')">Click Me</button> <input type="text" id="text2" value="" /> <button type="button" id="myButton2" onclick="myButtonClicked('text2')">Click Me</button> I fill some data in each textbox. Now when I refresh the page, the data is lost. I want to retain that data on the page refresh. I will use localStor...

How to call both Javascript function with PHP file on the click on HTML link? Recently, I was trying to implement logout functionality while working with PHP website. I had put logout logic in logout.php file and I was calling that file on the click of logout link like following: <a href="logout.php">Logout</a> This was working fine. But later on I realised that I also have to clear localstorage maintained by using Javascript before logging out the user. So, I had to call the javascript function that clears the localstorage before calling the logout.php file.  Javascript function for clearing the localstorage: function ClearMyLocalStorage() { localStorage.clear(); } I investigated two approaches to accomplish my task. Approach 1: <a href="logout.php" onclick="ClearMyLocalStorage()"> Approach 2: <a href="javascript:;" onclick="ClearMyLocalStorage();">Logout</a> And in your function you have to write like fu...

How to change InnerHTML of all the HTML Buttons in one go using jQuery? Suppose, I have 5 buttons on my page. How can I change the innerHTML of the buttons in one go using jQuery? I want that buttons having text "Clicked" should get changed to "Click me" when Change InnerHTML button is clicked. I will use jQuery to solve this problem. Refer the following example. <!DOCTYPE html> <html lang="en"> <head> <script type="text/javascript"> function ChangeInnerHTML() { //Iterate all the buttons with innerHTML = "Clicked" in the DOM and set them to "Click me". } </script> </head> <body> <button type="button" id="myButton1">Click me</button> <button type="button" id="myButton2">Clicked</button> <button type="button" id="myButton3">Click me</button> <button type="bu...

How to return value from child window to parent window using window.open in Javascript? It is very easy to return a value from a child window to parent window which has been opened from parent window using window.open method in Javascript. In many scenarios, it is possible to do some calculations on the child window and parent window need the result of that calculations to perform some task. So, let's try to resolve this problem. In Parent Window I have following Javascript function which will open a child window named childWin. I also have a function which will catch the value returned by the child window. function openChildWin()  {        var childWin = window.open("childWin.html", "_blank", "height=400, width=550, status=yes, toolbar=no, menubar=no, location=no,addressbar=no);  } function setValue(val1)  {    //you can use the value here which has been returned by your child window } ChildWin.html page Following is my childWin HTML page. T...

How to pass a Javascript Array to PHP file using AJAX and JSON? I have an array in javascript and I need to pass this array to a PHP by using AJAX call to that PHP file. I will get this array in PHP file and assign this javascript array to PHP array. Then I will find out the count of that PHP array elements and return it back to the javascript. I will convert JS array in JSON format by JSON.stringify. This is a very simple example on how to pass javascript array to PHP asynchronously. You can perform a lot of operations on this array which you have passed to PHP file but for simplicity I am just returning its count. Let's have a look at the following code snippet. Javascript Array var myJSArray = new Array("Saab","Volvo","BMW"); ProcessAJAXRequest() function wil pass JS array to PHP file using AJAX request and will show count of array elements returned by PHP file. function ProcessAJAXRequest() {     $.ajax     ({         type: "POST",   ...

AngularJS vs Ember vs Backbone: Which Javascript Framework to choose for Front-end Web Development? I have tried to compare three most widely used Javascript frameworks like AngularJS, Ember and Backbone in terms of their performance, model mutation, template engine, testability, easy to learn and implement etc. Which javascript framework to choose for front-end web development is mainly decided by the nature of your application, what functionalities do you want to achieve in your application and your hold on the Javascript framework. Let's try to understand the difference between the various features of AngularJS, Ember and Backbone. 1. Templates Backbone: In backbone, you can choose your own template engine, no matter whether it’s String or DOM based. Usually people prefer handlebars.js, a string-based template library. Ember: It uses built-in string-based templates (mandatory). Arguments in favor of string-based templates include “it’s faster” (debatable) and “theoretically, t...

Basic AngularJS Interview Questions and Answers for Front-end Web Developers AngularJS is widely known Javascript framework. If you are a front-end web developer preparing for AngularJS interview, following basic AngularJS interview questions and answers might help you little bit. Before going to AngularJS interview, you should know basic concepts and architecture of AngularJS, key features of AngularJS, how AngularJS is different from jQuery or other Javascript frameworks etc. Following basic AngularJS interview questions and answers will give you little insight of these concepts. 1. Why is this project called "AngularJS"? Why is the namespace called "ng"? Because HTML has Angular brackets and "ng" sounds like "Angular". 2. Is AngularJS a library, framework, plugin or a browser extension? AngularJS fits the definition of a framework the best, even though it's much more lightweight than a typical framework and that's why many confuse it w...

AngularJS vs jQuery: Difference between AngularJS and jQuery: Never mix up AngularJS and jQuery code AngularJS and jQuery are the Javascript frameworks and are different with each other, so never mix up the AngularJS and jQuery code in your project. Use only one Javascript framework at a time. If you are starting a new project, must consider AngularJS over jQuery. If you are a experienced jQuery developer, then you have to invest some time to work in AngularJS way. There are a lot of difference between AngularJS and jQuery. 1. Web designing approach in jQuery and AngularJS In jQuery, you design a page, and then you make it dynamic. This is because jQuery was designed for augmentation and has grown incredibly from that simple premise. But in AngularJS, you must start from the ground up with your architecture in mind. Instead of starting by thinking "I have this piece of the DOM and I want to make it do X", you have to start with what you want to accomplish, then go about desig...