javascript基础

[fp_Rock]

<script type="text/javascript">
function $(id){
	return document.getElementById(id);
}
window.onload = function() {
	$("insertRow").onclick = function() {
		
		alert("ok");
		//var rowIndex1 = document.all("addordel").length;
		var rowIndex1 = document.getElementsByTagName("li").length;
		alert(rowIndex1);
		if(rowIndex1 >= 5){
			alert('一次最多能上传5个文件');
			return false;
		}
		var obj=document.getElementsByName("addordel")[0].cloneNode(true);	
		//document.all("change").appendChild(obj);
		$("change").appendChild(obj);//动态添加的文件上传选项（问题：因为没有重新加载页面所以无法触发click事件！）
		event.returnValue = false;

	}
}
</script>
<div style=" background-image:url(images/upfile.gif); background-position:left; background-repeat:no-repeat; width: 95%; height:43px;"> </div>
<hr style=" width: 95%; border:1px #597ecf solid;"  />
<div style=" width: 95%; height:25px; background-color: #FFFFCC; border: 1px #FFFF66; line-height: 25px; text-align:center; color:#ff0000;"> 上传文件限制：100M</div>
<form method="post" enctype="multipart/form-data" action="?act=upfile">
<ul id="change">
<li id="addordel"><input id="upname[]" name="upname[]" type="file" style=" width: 200px; background-color:#f0f0f0; " /> 
<select id="foundtype[]" name="foundtype[]">
<?php
	$typesql = "select genrename from tb_uptype";
	$typearr = $conne->getRowsArray($typesql);
	$conne->close_rst();
	foreach($typearr as $value){
?>
		<option value="<?php echo $value['genrename']; ?>"><?php echo $value['genrename']; ?></option>
<?php
	}
?>
</select> 
<select id="ispub[]" name="ispub[]">
	<option value="0" selected="selected">不公开</option>
	<option value="1">公开</option>
</select> 
<button id="delRow" style=" border: 1px #CCCCCC solid; background-color:#f0f0f0;">删除</button> <button id="insertRow"  style=" border: 1px #cccccc solid; background-color: #f0f0f0;">增加</button> </li>
</ul>
<input id="upbtn" name="upbtn" type="submit" value="上传" onClick="return chkfile()" style=" background-color:#f0f0f0; border: 1px #CCCCCC solid;" />
</form>

问题：动态添加的文件上传选项后因为没有重新加载页面所以无法触发click事件怎么解决。

[scscms太阳光]

你看看jquery live函数吧，动态加载的也可绑定事件