用JavaScript實現兩種功能：一、切換全選/全不選文字；二、根據選中個數更新全選框狀態；（實例代碼來自view-source:http://www.fgm.cc/learn/lesson2/12

時間 2019-11-13

標籤 javascript 實現兩種功能切換全選全不文字根據選中個數更新狀態實例代碼來自 view source http www.fgm.cc www fgm learn lesson2 lesson 欄目 JavaScript 简体版

原文原文鏈接

關於反選和統計選中個數的問題解決我還不太懂，有待進一步學習和理解：javascript

	<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
	<html xmlns="http://www.w3.org/1999/xhtml">
	<head>
	<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
	<title>複選框（checkbox）全選/全不選/返選</title>
	<style>
	body,dl,dt,dd,p{margin:0;padding:0;}
	body{font-family:Tahoma;font-size:12px;}
	label,input,a{vertical-align:middle;}
	label{padding:0 10px 0 5px;}
	a{color:#09f;text-decoration:none;}
	a:hover{color:red;}
	dl{width:120px;margin:10px auto;padding:10px 5px;border:1px solid #666;border-radius:5px;background:#fafafa;}
	dt{padding-bottom:10px;border-bottom:1px solid #666;}
	dt label{font-weight:700;}
	p{margin-top:10px;}
	</style>
	<script type="text/javascript">
	window.onload = function ()
	{
	var oA = document.getElementsByTagName("a")[0];
	var oInput = document.getElementsByTagName("input");
	var oLabel = document.getElementsByTagName("label")[0];
	var isCheckAll = function ()
	{
	for (var i = 1, n = 0; i < oInput.length; i++)
	{
	oInput[i].checked && n++
	}
	oInput[0].checked = n == oInput.length - 1;
	oLabel.innerHTML = oInput[0].checked ? "全不選" : "全選"
	};
	//全選/全不選
	oInput[0].onclick = function ()
	{
	for (var i = 1; i < oInput.length; i++)
	{
	oInput[i].checked = this.checked
	}
	isCheckAll()
	};
	//反選
	oA.onclick = function ()
	{
	for (var i = 1; i < oInput.length; i++)
	{
	oInput[i].checked = !oInput[i].checked
	}
	isCheckAll()
	};
	//根據複選個數更新全選框狀態
	for (var i = 1; i < oInput.length; i++)
	{
	oInput[i].onclick = function ()
	{
	isCheckAll()
	}
	}
	}
	</script>
	</head>
	<body>
	<dl>
	<dt><input type="checkbox" id="checkAll" /><label>全選</label><a href="javascript:;">反選</a></dt>
	<dd>
	<p><input type="checkbox" name="item" /><label>選項（一）</label></p>
	<p><input type="checkbox" name="item" /><label>選項（二）</label></p>
	<p><input type="checkbox" name="item" /><label>選項（三）</label></p>
	<p><input type="checkbox" name="item" /><label>選項（四）</label></p>
	<p><input type="checkbox" name="item" /><label>選項（五）</label></p>
	<p><input type="checkbox" name="item" /><label>選項（六）</label></p>
	<p><input type="checkbox" name="item" /><label>選項（七）</label></p>
	<p><input type="checkbox" name="item" /><label>選項（八）</label></p>
	<p><input type="checkbox" name="item" /><label>選項（九）</label></p>
	<p><input type="checkbox" name="item" /><label>選項（十）</label></p>
	</dd>
	</dl>
	<center>一、切換全選/全不選文字；二、根據選中個數更新全選框狀態；</center>
	</body>
	</html>