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Form Validation Snippets: Email Validation with jQuery

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[前端(javascript) 所属分类 前端(javascript) | 发布者 店小二03 | 时间 2017 | 作者 红领巾 ] 0人收藏点击收藏

With jQuery, it’s possible to write code that executes client-side validations for your forms and input fields. A common validation to make is to check whether or not an email address that’s entered into an email field is actually a valid email address (or at least in valid email address format). The following is a great snippet to use to perform your own client side email input validation without having to use a plugin:

(function ($) {

$.fn.validateEmail = function () { return this.each(function () { var $this = $(this); $this.change(function () { var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/; if ($this.val() == "") { $this.removeClass("badEmail").removeClass("goodEmail") }else if(reg.test($this.val()) == false) { $this.removeClass("goodEmail"); $this.addClass("badEmail"); }else{ $this.removeClass("badEmail"); $this.addClass("goodEmail"); } }); }); }; })(jQuery);

The snippet above assigns the class “goodEmail” to a submission that’s in email format ( example@example.example ) and “badEmail” to submissions that aren’t, and if the .badEmail class is applied to the submission, it won’t be validated and the form will not submit.

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