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[jQuery Validation Plugin](https://jqueryvalidation.org/) - Form validation made easy ================================ [](https://github.com/jquery-validation/jquery-validation/releases/latest) [](https://travis-ci.org/jquery-validation/jquery-validation) [](https://david-dm.org/jquery-validation/jquery-validation#info=devDependencies) [](https://www.jsdelivr.com/package/npm/jquery-validation) The jQuery Validation Plugin provides drop-in validation for your existing forms, while making all kinds of customizations to fit your application really easy. ## Getting Started ### Downloading the prebuilt files Prebuilt files can be downloaded from https://jqueryvalidation.org/ ### Downloading the latest changes The unreleased development files can be obtained by: 1. [Downloading](https://github.com/jquery-validation/jquery-validation/archive/master.zip) or Forking this repository 2. [Setup the build](CONTRIBUTING.md#build-setup) 3. Run `grunt` to create the built files in the "dist" directory ### Including it on your page Include jQuery and the plugin on a page. Then select a form to validate and call the `validate` method. ```html <form> <input required> </form> <script src="jquery.js"></script> <script src="jquery.validate.js"></script> <script> $("form").validate(); </script> ``` Alternatively include jQuery and the plugin via requirejs in your module. ```js define(["jquery", "jquery.validate"], function( $ ) { $("form").validate(); }); ``` For more information on how to setup a rules and customizations, [check the documentation](https://jqueryvalidation.org/documentation/). ## Reporting issues and contributing code See the [Contributing Guidelines](CONTRIBUTING.md) for details. **IMPORTANT NOTE ABOUT EMAIL VALIDATION**. As of version 1.12.0 this plugin is using the same regular expression that the [HTML5 specification suggests for browsers to use](https://html.spec.whatwg.org/multipage/forms.html#valid-e-mail-address). We will follow their lead and use the same check. If you think the specification is wrong, please report the issue to them. If you have different requirements, consider [using a custom method](https://jqueryvalidation.org/jQuery.validator.addMethod/). In case you need to adjust the built-in validation regular expression patterns, please [follow the documentation](https://jqueryvalidation.org/jQuery.validator.methods/). **IMPORTANT NOTE ABOUT REQUIRED METHOD**. As of version 1.14.0 this plugin stops trimming white spaces from the value of the attached element. If you want to achieve the same result, you can use the [`normalizer`](https://jqueryvalidation.org/normalizer/) that can be used to transform the value of an element before validation. This feature was available since `v1.15.0`. In other words, you can do something like this: ``` js $("#myForm").validate({ rules: { username: { required: true, // Using the normalizer to trim the value of the element // before validating it. // // The value of `this` inside the `normalizer` is the corresponding // DOMElement. In this example, `this` references the `username` element. normalizer: function(value) { return $.trim(value); } } } }); ``` ## License Copyright &copy; Jörn Zaefferer<br> Licensed under the MIT license.