用JavaScript实现两种功能:1、切换全选/全不选文字;2、根据选中个数更新全选框状态;(实例代码来自view-source:http://www.fgm.cc/learn/lesson2/12.html)
关于反选和统计选中个数的问题解决我还不太懂,有待进一步学习和理解:
<!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>复选框(checkbox)全选/全不选/返选</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 ? "全不选" : "全选" | |
}; | |
//全选/全不选 | |
oInput[0].onclick = function () | |
{ | |
for (var i = 1; i < oInput.length; i++) | |
{ | |
oInput[i].checked = this.checked | |
} | |
isCheckAll() | |
}; | |
//反选 | |
oA.onclick = function () | |
{ | |
for (var i = 1; i < oInput.length; i++) | |
{ | |
oInput[i].checked = !oInput[i].checked | |
} | |
isCheckAll() | |
}; | |
//根据复选个数更新全选框状态 | |
for (var i = 1; i < oInput.length; i++) | |
{ | |
oInput[i].onclick = function () | |
{ | |
isCheckAll() | |
} | |
} | |
} | |
</script> | |
</head> | |
<body> | |
<dl> | |
<dt><input type="checkbox" id="checkAll" /><label>全选</label><a href="javascript:;">反选</a></dt> | |
<dd> | |
<p><input type="checkbox" name="item" /><label>选项(一)</label></p> | |
<p><input type="checkbox" name="item" /><label>选项(二)</label></p> | |
<p><input type="checkbox" name="item" /><label>选项(三)</label></p> | |
<p><input type="checkbox" name="item" /><label>选项(四)</label></p> | |
<p><input type="checkbox" name="item" /><label>选项(五)</label></p> | |
<p><input type="checkbox" name="item" /><label>选项(六)</label></p> | |
<p><input type="checkbox" name="item" /><label>选项(七)</label></p> | |
<p><input type="checkbox" name="item" /><label>选项(八)</label></p> | |
<p><input type="checkbox" name="item" /><label>选项(九)</label></p> | |
<p><input type="checkbox" name="item" /><label>选项(十)</label></p> | |
</dd> | |
</dl> | |
<center>1、切换全选/全不选文字;2、根据选中个数更新全选框状态;</center> | |
</body> | |
</html> | |