In JavaScript, you can check whether a variable is undefined or null or blank or has a value defined in it. In JavaScript, ‘undefined’ means a variable has been declared but has not been assigned a value yet, such as: var a; console.log(a); //shows undefined console.log(typeof a); //shows undefined ‘null’ is an assignment value. This […]
Front-end web development with ReactJS remained a hot trend in 2020 and is continuing its popularity till now. According to Statista, it is the most used framework among developers worldwide in 2021. If you also prefer ReactJS over other frameworks, enjoy this article; it covers various methods to implement conditional rendering in ReactJS to help […]
jQuery parseJSON() takes a well formed JSON string and then returns the resulting JavaScript value. Prior to jQuery 1.9 version, $.parseJSON returned null value rather than throwing an error if this was passed an empty string, null, or undefined, even though those are not valid JSON. Here are some basic things about JSON: JSON is […]
Using jQuery abort() you can cancel a running AJAX request forcefully before it ends as this hits several times within a short time period. This is usually in cases where the user might perform an action, based on AJAX request several times within a short time period. For example, There is a auto-complete functionality for […]
MySQL LEFT JOIN allows you to get result set from two or more tables for certain matches. Suppose you have two tables i.e. A and B. So if you join A to B using left join then all rows from the A tables will be displayed with matches a row from the B table. Example […]