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jQuery表單驗證功能執行個體，jquery表單一實例
本文執行個體講述了jQuery表單驗證功能。分享給大家供大家參考。具體如下：
這裡使用jquery實現的表單驗證效果，以Ajax方式驗證你的表單是否填寫正確，如果驗證不通過，會將表單元素背景變成紅色，並給出提示資訊，簡單實用，jquery表單驗證功能已經有很多了，本款表單驗證特效看上去更簡單，不懂Ajax的朋友，或許直接套用即可實現無重新整理表單驗證功能。
運行效果如下：
線上示範地址如下：
http://demo.jb51.net/js/2015/jquery-table-form-check-codes/
具體代碼如下：
<!DOCTYPE html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>jQuery表單驗證</title><style type="text/css">body, input, textarea { font-size:12px; line-height:18px; font-family:Verdana, Geneva, sans-serif;}input {width:200px;}.submit {width:120px;}#error { color:red; font-size:10px; display:none;}.needsfilled { background:red; color:white;}</style><script type="text/javascript" src="jquery-1.6.2.min.js"></script><script type="text/javascript">$(document).ready(function(){ // Place ID's of all required fields here. required = ["name", "email", "message"]; // If using an ID other than #email or #error then replace it here email = $("#email"); errornotice = $("#error"); // The text to show up within a field when it is incorrect emptyerror = "Please fill out this field."; emailerror = "Please enter a valid e-mail."; $("#theform").submit(function(){ //Validate required fields for (i=0;i<required.length;i++) { var input = $('#'+required[i]); if ((input.val() == "") || (input.val() == emptyerror)) { input.addClass("needsfilled"); input.val(emptyerror); errornotice.fadeIn(750); } else { input.removeClass("needsfilled"); } } // Validate the e-mail. if (!/^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/.test(email.val())) { email.addClass("needsfilled"); email.val(emailerror); } //if any inputs on the page have the class 'needsfilled' the form will not submit if ($(":input").hasClass("needsfilled")) { return false; } else { errornotice.hide(); return true; } }); // Clears any fields in the form when the user clicks on them $(":input").focus(function(){ if ($(this).hasClass("needsfilled") ) { $(this).val(""); $(this).removeClass("needsfilled"); } });}); </script></head><body><form action="mail.php" id="theform" name="theform" method="post"> <p><label for="name">Name</label><br /><input id="name" type="text" value="" name="name" /></p> <p><label for="email">E-mail</label><br /><input id="email" type="text" value="" name="email" /></p> <p><label for="message">Message</label><br /><textarea id="message" rows="7" cols="30" name="message"></textarea></p> <p><input class="submit" type="submit" name="submit" value="Submit Form" /></p> <p id="error">表單中有錯誤資訊！</p></form></body></html>
希望本文所述對大家的jquery程式設計有所協助。
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