点击“全选”按钮时选中所有的“多选框”如何实现？

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>全选与反选</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<script language="javascript">
// --列头全选框被单击---
function ChkAllClick(sonName, cbAllId){
    var arrSon = document.getElementsByName(sonName);
var cbAll = document.getElementById(cbAllId);
var tempState=cbAll.checked;
for(i=0;i<arrSon.length;i++) {
  if(arrSon[i].checked!=tempState)
           arrSon[i].click();
}
}// --子项复选框被单击---
function ChkSonClick(sonName, cbAllId) {
var arrSon = document.getElementsByName(sonName);
var cbAll = document.getElementById(cbAllId);
for(var i=0; i<arrSon.length; i++) {
     if(!arrSon[i].checked) {
     cbAll.checked = false;
     return;
     }
}
cbAll.checked = true;
}// --反选被单击---
function ChkOppClick(sonName){
var arrSon = document.getElementsByName(sonName);
for(i=0;i<arrSon.length;i++) {
  arrSon[i].click();
}
}
</script>
</head><body>
<form name="form1" method="post" action="">
<table width="500" border="1">
  <tr bgcolor="#FFFF66">
    <td>
      <INPUT name="chkAll" id="chkAll" title="全选" onClick="ChkAllClick('chkSon','chkAll')" type="checkbox" />全选</td>
    <td align="center">复选框全选示例 </td>
    <td> </td>
    <td> </td>
  </tr>
  <tr>
    <td><INPUT name="chkSon" id="chkSon1" type="checkbox"  value='1' onclick="ChkSonClick('chkSon','chkAll')" />1</td>
    <td> 作用： </td>
    <td> </td>
    <td> </td>
  </tr>
  <tr>
    <td><INPUT name="chkSon" id="chkSon2" type="checkbox"  value='2' onclick="ChkSonClick('chkSon','chkAll')" />2</td>
    <td> a.单击列头复选框全选或全不选子项 </td>
    <td> </td>
    <td> </td>
  </tr>
  <tr>
    <td><INPUT name="chkSon" id="chkSon3" type="checkbox"  value='3' onclick="ChkSonClick('chkSon','chkAll')" />3</td>
    <td> b.只要有一个子项没有选中，则取消列头的选中状态 </td>
    <td> </td>
    <td> </td>
  </tr>
  <tr>
    <td><INPUT name="chkSon" id="chkSon4" type="checkbox"  value='4' onclick="ChkSonClick('chkSon','chkAll')" />4</td>
    <td> c.当所有子项目选中时，列头复选框自动置为选中状态 </td>
    <td> </td>
    <td> </td>
  </tr>
  <tr>
    <td><INPUT name="chkSon" id="chkSon5" type="checkbox"  value='5' onclick="ChkSonClick('chkSon','chkAll')" />5</td>
    <td> </td>
    <td> </td>
    <td> </td>
  </tr>
  <tr>
    <td><INPUT name="chkSon" id="chkSon6" type="checkbox"  value='6' onclick="ChkSonClick('chkSon','chkAll')" />6</td>
    <td> </td>
    <td> </td>
    <td> </td>
  </tr>
  <tr>
    <td><INPUT name="chkSon" id="chkSon7" type="checkbox"  value='7' onclick="ChkSonClick('chkSon','chkAll')" />7</td>
    <td> </td>
    <td> </td>
    <td> </td>
  </tr>
  <tr>
    <td><INPUT name="chkSon" id="chkSon8" type="checkbox"  value='8' onclick="ChkSonClick('chkSon','chkAll')" />8</td>
    <td> </td>
    <td> </td>
    <td> </td>
  </tr>
  <tr>
    <td><INPUT name="chkSon" id="chkSon9" type="checkbox"  value='9' onclick="ChkSonClick('chkSon','chkAll')" />9</td>
    <td> </td>
    <td> </td>
    <td> </td>
  </tr>
  <tr>
    <td><INPUT name="chkSon" id="chkSon10" type="checkbox"  value='10' onclick="ChkSonClick('chkSon','chkAll')" />10</td>
    <td>d.将复选框反过来选</td>
    <td> </td>
    <td> </td>
  </tr>
  <tr bgcolor="#66FFFF">
    <td><INPUT name="chkOpposite" id="chkOpposite" title="反选" onClick="ChkOppClick('chkSon')" type="checkbox" />反选</td>
    <td align="center">反选示例</td>
    <td> </td>
    <td> </td>
  </tr>
</table>
</form>
</body>
</html>
楼主这个一搜一大堆js 全选。
<!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>无标题文档</title>
<script type="text/javascript">
window.onload = function() {
  document.getElementById('btn').onclick = function() {
  var obj = document.getElementsByTagName('input'); //获取文档中所有的input元素
  for (var i = 0; i < obj.length; i ++) {
  if (obj[i].type == 'checkbox') {
  obj[i].checked = true; //设置复选框元素对象的checked属性值为true就能勾选该复选框；false即为取消选择
  }
  }
  }
}
</script>
</head><body>
<form>
<input type="checkbox" />1<br />
    <input type="checkbox" />2<br />
    <input type="button" id="btn" value="全选" />
</form>
</body>
</html>

调试易

点击“全选”按钮时选中所有的“多选框”如何实现？

解决方案 »