One of the best features of jQuery AJAX Method is to load data from external website by calling APIs, and get the response in JSON or XML formats. Can be a function created by ''jQuery.validator.format(value)''. Validate elements (except checkboxes/radio buttons) on blur. So to check if at least one of a group of checkboxes is checked: In general, it is a good idea to encapsulate those regular expressions inside their own method. function: This is an optional parameter. jQuery HTML jQuery jQuery jQuery jQuery jQuery CSS jQuery css() jQuery jQuery jQuery jQuery jQuery jQuery jQuery jQuery Ajax jQuery AJAX jQuery load() jQuery get()/post() jQuery The following table lists all the jQuery methods used to handle events. after including validator file define your validation something like this. Introduction to jQuery Validate. show() hide() - Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more. This can be seen in the example below by examining the value of banana. The jQuery click() function accepts one parameter that is the name of the function to run when a click event occurs and it is optional. Some times it could be issue with older version (or not stable version) of JQuery files . Imagine we have the following html control: I am trying to validate html select element using jQuery Validate plugin. It specifies the attach function which is to be executed whenever the click event occurs. jQuery HTML jQuery jQuery jQuery jQuery jQuery CSS jQuery css() jQuery jQuery jQuery jQuery jQuery jQuery jQuery jQuery Ajax jQuery AJAX jQuery load() jQuery get()/post() jQuery you can use jquery validator for that but you need to add jquery.validate.js and jquery.form.js file for that. You are able to create a custom rule and attach it to an element using the data attribute using the syntax data-rule-rulename="true";. I am trying to validate the input for E-Mail via JQuery: My JQuery