`

checkbox 多选

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title> New Document </title>
<meta name="Generator" content="EditPlus">
<meta name="Author" content="">
<meta name="Keywords" content="">
<meta name="Description" content="">
<script language="JavaScript">
<!--
var ii = 0;
function boxnum(){
    var box = document.getElementsByName("c");    
    for(var i=0;i<box.length;i++){
        box[i].onclick = function chk(){        
        if(this.checked && ii <= 5) ii += 1;
        if(! this.checked) ii -= 1;
        if(ii>5){ ii -=1; this.checked = false;alert('最多不能超多5个主营项目!请重新选择!');}
    }
    }
    
}
window.onload = boxnum;
//-->
</script>
</head>

<body>
<table cellspacing="0" border="1" width="200" >
    <tr>
        <td><input type="checkbox" name="c"></td>
        <td><input type="checkbox" name="c"></td>
        <td><input type="checkbox" name="c"></td>
    </tr>
    <tr>
        <td><input type="checkbox" name="c"></td>
        <td><input type="checkbox" name="c"></td>
        <td><input type="checkbox" name="c"></td>
    </tr>
</body>
</html>



第二种方法



<!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=gb2312" />
<title>无标题文档</title>
<script>

function boxnum(obj){
    
}

function checknum(){
var e,srcE
  e=window.event?window.event:e; 
  srcE=e.srcElement?e.srcElement:e.target; 
  if(!srcE)return; 
if(String(srcE.tagName).toLowerCase()!="input"||String(srcE.type).toLowerCase()!="checkbox")return;
var box = document.form1.elements['checkbox3'];
    var ii = 0
    for(var i=0;i<box.length;i++){
        if(box[i].checked){ii++;}
    }
    if(ii>5){
        alert('最多不能超多5个主营项目!请重新选择!');
        srcE.checked=false;
                }
}
document.onkeydown=document.onchange=document.onclick=checknum; 
</script>
</head>

<body>
<form id="form1" name="form1" method="post" action="">
  <table width="520" height="221" border="1">
    <tr>
      <td><label>
        <input type="checkbox" name="checkbox3" value="checkboxa" />
       1  
       <input type="checkbox" name="checkbox3" value="checkboxaa" />
       2
        <input type="checkbox" name="checkbox3" value="checkboxaaa" />
        3
        <input type="checkbox" name="checkbox3" value="checkboxaaaa" />
        4
        <input type="checkbox" name="checkbox3" value="checkboxcv" />
        5
        <input type="checkbox" name="checkbox3" value="checkboxcvb" />
        6
        <input type="checkbox" name="checkbox3" value="checkboxcvbcvb" />
        7
        <input type="checkbox" name="checkbox3" value="checkboxcvbcvbcv" />
        8
        <input type="checkbox" name="checkbox3" value="checcvb" />
        9
        <input type="checkbox" name="checkbox3" value="checvb" />
        10
        <input type="checkbox" name="checkbox3" value="chcvbox" />
        <input type="checkbox" name="checkbox3" value="chcvbcvbox" />
        <input type="checkbox" name="checkbox3" value="ccvbcvbcvox" />
      </label></td>
      <td> </td>
      <td> </td>
    </tr>
    <tr>
      <td><input type="button" name="Submit" value="按钮" onclick="boxnum('checkbox3')" /></td>
      <td> </td>
      <td> </td>
    </tr>
    <tr>
      <td> </td>
      <td> </td>
      <td> </td>
    </tr>
  </table>
</form>
</body>
</html>

第三种方法



<form method="post" action="" name="form1" id="form1">
    <input type="checkbox" name="a" />
    <input type="checkbox" name="a" />
    <input type="checkbox" name="a" />
    <input type="checkbox" name="a" />
    <input type="checkbox" name="a" />
    <input type="checkbox" name="a" />
    <input type="checkbox" name="a" />
    <input type="checkbox" name="a" />
    <input type="checkbox" name="a" />
</form>
<script language="javascript" type="text/javascript">
    var m_count = 0;
    document.getElementById("form1").onclick = function(e){
        ele = (document.all)?window.event.srcElement:e.target;
        if (ele.nodeName.toLowerCase()=="input" && ele.type.toLowerCase()=="checkbox" && ele.checked)
            m_count++;
        if (ele.nodeName.toLowerCase()=="input" && ele.type.toLowerCase()=="checkbox" && !ele.checked)
            m_count--;
        if(m_count>5){
            m_count--;
            alert("最多不能超多5个主营项目!");
            return false;
        }
        return true;
    }
</script>

  protected void chkAll_CheckedChanged(object sender, EventArgs e)
    {
        try
        {
            foreach (Control ctrl in Page.Form.Controls)
            {
                if (ctrl is System.Web.UI.WebControls.CheckBox)
                {
                    ((CheckBox)ctrl).Checked = chkAll.Checked;                   
                }
            }
        }
        catch (Exception ex)
        {
            throw ex;
        }
    }
var   isChecked=true  
  function   chALl()  
  {  
  o   =   document.getElementsByTagName("INPUT")  
  for(i=0;i<o.length;i++)  
  if(o[i].type=="checkbox")   o[i].checked=isChecked  
  isChecked=!isChecked  
  }

本文出处,http://www.cnblogs.com/hqbird/archive/2008/10/13/1309636.html
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