javascript checkboxの全選と全部選択しません.

1413 ワード


   <html>
	<head>
		<title></title>
		<script type="text/javascript">
		function checkAll(){
				for (var i = 0; i < document.getElementsByName("checkItem").length; i++) {
			   document.getElementsByName("checkItem")[i].checked = document.getElementById("all").checked;
			  }
			}
		</script>
	</head>
	<body>
		<form>
		<table >
		<tr>
			<td><input type="checkbox" name="all" id="all" onclick="checkAll()"/>Select All</td>
		</tr>
		<tr>
			<td><input type="checkbox" name="checkItem" value="value1"/></td>
		</tr>
		<tr>
			<td><input type="checkbox" name="checkItem" value="value2"/></td>
		</tr>
		<tr>
			<td><input type="checkbox" name="checkItem" value="value3"/></td>
		</tr>
		<tr>
			<td><input type="checkbox" name="checkItem" value="value4"/></td>
		</tr>
		<table >
		</form>
	</body>
</html>