jquery-validation JQ 表单验证

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jquery-validation是一款前端验证js插件，可以验证必填字段、邮件、URL、数字范围等，在表单中应用非常广泛。

官方网站 https://jqueryvalidation.org/

下载地址:https://github.com/jquery-validation/jquery-validation/releases/tag/1.19.0

技术图片

把页面下拉到底,选择第一个下载

引入关键JS

<script src="../lib/jquery.js"></script>
<script src="../dist/jquery.validate.js"></script>

引入中文支持JS

<script src="js/messages_zh.js"></script>

表单代码 关键:required 表示必填字段

<form class="cmxform" id="commentForm" method="get" action="">
		<fieldset>
			<legend>请提供您的姓名、电子邮件地址（不会发布）和评论</legend>
			<p>
				<label for="cname">姓名</label>
				<input id="cname" name="name" minlength="2" type="text" required>
			</p>
			<p>
				<label for="cemail">邮件地址</label>
				<input id="cemail" type="email" name="email" required>
			</p>
			<p>
				<label for="curl">URL</label>
				<input id="curl" type="url" name="url">
			</p>
			<p>
				<label for="ccomment">你的评论</label>
				<textarea id="ccomment" name="comment" required></textarea>
			</p>
			<p>
				<input class="submit" type="submit" value="提交">
			</p>
		</fieldset>
	</form>

完整代码

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="utf-8">
	<title>jQuery validation plug-in - main demo</title>
	<link rel="stylesheet" href="css/screen.css">
	<script src="../lib/jquery.js"></script>
	<script src="../dist/jquery.validate.js"></script>
	<script src="js/messages_zh.js"></script>
	<script>
	$.validator.setDefaults(
		submitHandler: function() 
			alert("submitted!");
		
	);

	$().ready(function() 
		// validate the comment form when it is submitted
		$("#commentForm").validate();

		// validate signup form on keyup and submit
		$("#signupForm").validate(
			rules: 
				firstname: "required",
				lastname: "required",
				username: 
					required: true,
					minlength: 2
				,
				password: 
					required: true,
					minlength: 5
				,
				confirm_password: 
					required: true,
					minlength: 5,
					equalTo: "#password"
				,
				email: 
					required: true,
					email: true
				,
				topic: 
					required: "#newsletter:checked",
					minlength: 2
				,
				agree: "required"
			,
			messages: 
				firstname: "Please enter your firstname",
				lastname: "Please enter your lastname",
				username: 
					required: "Please enter a username",
					minlength: "Your username must consist of at least 2 characters"
				,
				password: 
					required: "Please provide a password",
					minlength: "Your password must be at least 5 characters long"
				,
				confirm_password: 
					required: "Please provide a password",
					minlength: "Your password must be at least 5 characters long",
					equalTo: "Please enter the same password as above"
				,
				email: "Please enter a valid email address",
				agree: "Please accept our policy",
				topic: "Please select at least 2 topics"
			
		);

		// propose username by combining first- and lastname
		$("#username").focus(function() 
			var firstname = $("#firstname").val();
			var lastname = $("#lastname").val();
			if (firstname && lastname && !this.value) 
				this.value = firstname + "." + lastname;
			
		);

		//code to hide topic selection, disable for demo
		var newsletter = $("#newsletter");
		// newsletter topics are optional, hide at first
		var inital = newsletter.is(":checked");
		var topics = $("#newsletter_topics")[inital ? "removeClass" : "addClass"]("gray");
		var topicInputs = topics.find("input").attr("disabled", !inital);
		// show when newsletter is checked
		newsletter.click(function() 
			topics[this.checked ? "removeClass" : "addClass"]("gray");
			topicInputs.attr("disabled", !this.checked);
		);
	);
	</script>
	<style>
	#commentForm 
		width: 500px;
	
	#commentForm label 
		width: 250px;
	
	#commentForm label.error, #commentForm input.submit 
		margin-left: 253px;
	
	#signupForm 
		width: 670px;
	
	#signupForm label.error 
		margin-left: 10px;
		width: auto;
		display: inline;
	
	#newsletter_topics label.error 
		display: none;
		margin-left: 103px;
	
	#main
	padding: 10px 10px 10px 10px;
	
	</style>
</head>
<body>
<div id="main">
	<form class="cmxform" id="commentForm" method="get" action="">
		<fieldset>
			<legend>请提供您的姓名、电子邮件地址（不会发布）和评论</legend>
			<p>
				<label for="cname">姓名</label>
				<input id="cname" name="name" minlength="2" type="text" required>
			</p>
			<p>
				<label for="cemail">邮件地址</label>
				<input id="cemail" type="email" name="email" required>
			</p>
			<p>
				<label for="curl">URL</label>
				<input id="curl" type="url" name="url">
			</p>
			<p>
				<label for="ccomment">你的评论</label>
				<textarea id="ccomment" name="comment" required></textarea>
			</p>
			<p>
				<input class="submit" type="submit" value="提交">
			</p>
		</fieldset>
	</form>
	<div>
</body>
</html>

　　技术图片

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