菜鸟学堂在线工具

源代码

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>jQuery Validate 插件 - 动态表单</title>
<link rel="stylesheet" media="screen" href="/assets/jquery-validation-1.14.0/demo/css/screen.css">
<script src="http://edu.jb51.net/assets/jquery-validation-1.14.0/lib/jquery.js"></script>
<script src="http://edu.jb51.net/assets/jquery-validation-1.14.0/dist/jquery.validate.min.js"></script>
<script src="http://edu.jb51.net/assets/jquery-validation-1.14.0/dist/localization/messages_zh.js"></script>
<script type="text/javascript">
// 只用于演示
$.validator.setDefaults({
	submitHandler: function() {
		alert("submitted!");
	}
});
$.validator.messages.max = jQuery.validator.format("Your totals mustn't exceed {0}!");

$.validator.addMethod("quantity", function(value, element) {
	return !this.optional(element) && !this.optional($(element).parent().prev().children("select")[0]);
}, "请选择项目和数量。");

$().ready(function() {
	$("#orderform").validate({
		errorPlacement: function(error, element) {
			error.appendTo( element.parent().next() );
		},
		highlight: function(element, errorClass) {
			$(element).addClass(errorClass).parent().prev().children("select").addClass(errorClass);
		}
	});

var template = jQuery.validator.format($.trim($("#template").val()));
	function addRow() {
		$(template(i++)).appendTo("#orderitems tbody");
	}

var i = 1;
	// 开始时只有一行
	addRow();
	// 点击时添加更多行
	$("#add").click(addRow);

// 检查 quantity 输入框的 keyup 动作，更新 totals 字段
	$("#orderform").validateDelegate("input.quantity", "keyup", function(event) {
		var totals = 0;
		$("#orderitems input.quantity").each(function() {
			totals += +this.value;
		});
		$("#totals").attr("value", totals).valid();
	});

});
</script>
<style type="text/css">
form.cmxform { width: 50em; }
em.error {
  background:url("/try/jquery/plugins/images/unchecked.gif") no-repeat 0px 0px;
  padding-left: 16px;
}
em.success {
  background:url("/try/jquery/plugins/images/checked.gif") no-repeat 0px 0px;
  padding-left: 16px;
}

form.cmxform label.error {
	margin-left: auto;
	width: 250px;
}
form.cmxform input.submit {
	margin-left: 0;
}
em.error { color: black; }
#warning { display: none; }
select.error {
	border: 1px dotted red;
}
</style>
</head>
<body>
<div id="main">
<textarea style="display:none" id="template">
	<tr>
		<td>
			<label>{0}. Item</label>
		</td>
		<td class='type'>
			<select name="item-type-{0}">
				<option value="">请选择...</option>
				<option value="0">Learning jQuery</option>
				<option value="1">jQuery Reference Guide</option>
				<option value="2">jQuery Cookbook</option>
				<option vlaue="3">jQuery In Action</option>
				<option value="4">jQuery For Designers</option>
			</select>
		</td>
		<td class='quantity'>
			<input size='4' class="quantity" min="1" id="item-quantity-{0}" name="item-quantity-{0}" />
		</td>
		<td class='quantity-error'></td>
	</tr>
</textarea>
<form id="orderform" class="cmxform" method="get" action="foo.html">
<h2 id="summary"></h2>
<fieldset>
<legend>动态表单</legend>
<table id="orderitems">
<tbody>
</tbody>
<tfoot>
<tr>
<td colspan="2"><label>总共（最多 25）</label></td>
<td class="totals"><input id="totals" name="totals" value="0" max="25" readonly="readonly" size='4' /></td>
<td class="totals-error"></td>
</tr>
<tr>
<td colspan="2">&nbsp;</td>
<td><input class="submit" type="submit" value="提交"/></td>
</tr>
</tfoot>
</table>
</fieldset>
</form>
<button id="add">向表单添加输入框</button>
<h1 id="warning">您的表单包含大量的错误！请重新输入。</h1>
</div>
</body>
</html>

运行结果 在线运行