jquery validate
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>jquery validate</title>
<script src="http://static.runoob.com/assets/jquery-validation-1.14.0/lib/jquery.js"></script>
<script src="http://static.runoob.com/assets/jquery-validation-1.14.0/dist/jquery.validate.min.js"></script>
<script src="http://static.runoob.com/assets/jquery-validation-1.14.0/dist/localization/messages_zh.js"></script>
<script>
//拦截表单提交事件,执行完自定义代码后再提交表单内容
$.validator.setDefaults({
//（Validation插件success和submitHandler两个方法区别
success：当表单元素验证成功时执行，对于同一个表单元素，由于onkeyup、onfocusout、onsubmit等事件都会触发验证，所以本方法可能会多次执行；
submitHandler：当表单验证成功并提交时执行，存在此方法时表单只能在此方法内部执行form.submit()才能提交，可理解成它替代了表单的onsubmit方法；
）
submitHandler: function() {
alert("提交事件!");
}
});
$().ready(function() {
// 提交时验证表单
var validator = $("#form1").validate({
//错误配置
errorPlacement: function(error, element) {
// Append error within linked label
$( element )
.closest( "form" )
.find( "label[for='" + element.attr( "id" ) + "']" )
.append( error );
},
errorElement: "span",
messages: {
user: {
required: " (必需字段)",
minlength: " (不能少于 3 个字母)"
},
password: {
required: " (必需字段)",
minlength: " (字母不能少于 5 个且不能大于 12 个)",
maxlength: " (字母不能少于 5 个且不能大于 12 个)"
}
}
});
$(".cancel").click(function() {
validator.resetForm();
});
});
</script>
<style>
.error{
color:red;
}
</style>
</head>
<body>
<form method="get" class="cmxform" id="form1" action="">
<fieldset>
<legend>登录框</legend>
<p>
<label for="user">用户名</label>
<input id="user" name="user" required minlength="3">
</p>
<p>
<label for="password">密码</label>
<input id="password" type="password" maxlength="12" name="password" required minlength="5">
</p>
<p>
<input class="submit" type="submit" value="Login">
</p>
</fieldset>
</form>
</body>
</html>
效果图：
详细教程：http://www.runoob.com/jquery/jquery-plugin-validate.html
