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CORS (Cross-origin resource sharing) helps in making Javascript based AJAX request from one domain to another, requesting domain is different from the domain where the request is made. This type of request is by default forbidden at the browser level and if this type of requet is made without proper settings, they will result in some origin security policy error. ... Read More »

Integrating Facebook Login Facebook login is considered as one of the most preferable way for authenticating users. This approach is also very convenient for the users as Facebook has very deep reach among users. This post will illustrate as to how to integrate Facebook login as a way of authenticating users. We will be using Javascript SDK provided by Facebook. ... Read More »

jQuery load/parse JSON response jQuery.parseJSON( json ); Takes a well-formed JSON string and returns the resulting JavaScript value, probably object or array of objects. Passing in a malformed JSON string results in a JavaScript exception being thrown. For example, the following are all invalid JSON strings: “{test: 1}” (test does not have double quotes around it). “{‘test’: 1}” (‘test’ is ... Read More »

Prevent Safari/any browser loading from cache when back button is clicked This problem is caused by back-forward cache. It saves complete state of page when user navigates away. When user navigates back with back button, page is loaded from cache very quickly. This is different from normal cache which only caches HTML code. This kind of situation arises mainly with ... Read More »

jQuery detecting scroll- scroll reaching to the bottom of page Detecting scroll and executing login based on scrolling has important significance in web development like implementing pagination, where more data gets loaded when user scrolls near the bottom of page. So, first basic question arises as to how to detect scroll. window.onscroll = function(ev) { //execute your logic here } ... Read More »

How to detect selected checkbox/radio elements in jQuery Mobile Framework Well! detecting checked OR radio elements seems no difficult task as far as JQuery is concerned. But here I will discuss some small points (which may fill your knowledge gaps) and finally will provide a fully tested jQuery code that detects checked OR radio elements for jQuery mobile framework. First ... Read More »

URL shortening using Google API Sometimes we need to share a long URL or we need to tweet them. But because of the length of the URL we are not able to do so. Google provides a service using which we can convert our long URL and squeezes them to fewer character URL. This service of Google is also known ... Read More »

XSS (cross-site scripting)is the most prevalent web application security flaw. XSS flaws occur when an application includes user supplied data in a page sent to the browser without properly validating or escaping that content. Detection of most XSS flaws is fairly easy via testing or code analysis. How Do I Prevent ‘Cross-Site Scripting (XSS)’? HTML escaping Escaping of Input Escaping ... Read More »

In this tutorial, we will learn how to create a J2EE Web Application project with Apache Maven, imports it into the Eclipse IDE, and package the Java project into a war file. Tools used : Maven 3.2.5 (For how to install, click here) Eclipse (Kepler Release) JDK 7 A. Create a Java Project from Maven Template In a terminal (*uix ... Read More »

Cross Domain jQuery AJAX request AJAX Requests are only possible if port, protocol and domain of sender and receiver are equal, means that the following below listed requests won’t work- Requesting https://serverA.com/a.php from http://serverA.com/b.php Requesting http://subdomain.serverA.com from http://serverA.com Requesting http://serverA.com:5000 from http://serverA.com Here in this tutorial we will cover the ways to handle this restriction. First lets look at the ... Read More »