js checkbox的一些操作

checkbox全选：

function checkAll() 
{ 
	var str = 'KEY';
	var a = document.getElementsByName(str);  
	var n = a.length; 
	for (var i=0; i<n; i++) 
	a[i].checked = window.event.srcElement.checked; 
}

function checkItem() 
{ 
	var str = 'ALL';
	var e = window.event.srcElement; 
	var all = eval("document.all."+ str); 
	if (e.checked) 
	{ 
		var a = document.getElementsByName(e.name); 
		all.checked = true;  
		for (var i=0; i<a.length; i++) 
		{ 
			if (!a[i].checked)
			{ 
				all.checked = false; break;
			} 
		}
	} 
	else 
		all.checked = false; 
}

选中值合并成一个字符串

function toDel(){
	var c ="确认删除？";
	var url;0
  	var boxes = document.getElementsByName("KEY");
    var groupTypeId = new Array();
    var num = 0;
    for (var i = 0; i < boxes.length; i++)
    {
    if (boxes[i].checked)
    {
    	 groupTypeId[num] = boxes[i].value;
  	     num++;
    }
	}
    if(groupTypeId.length<1){
		alert('请至少选中一条员工记录！');
		return;
  	    }
    if(confirm(c)){
    var ids = groupTypeId.join('_');
		url = '<%=_base%>/qy/message.do?method=del&ids='+ids;  
		window.open(url,"","width=660,height=600,status=no,toolbar=no,menubar=no,location=no,scrollbars=yes,depended=yes,z-look=yes,top=150,left=200");
    }
  	}