/*删除已经添加的附件项*/
function removeChild(parent,child,tip)
{
var i=parent.getAttribute("count");
if(isIE())
{
var id=parseInt(child.getAttribute("id"));
parent.removeChild(child);
parent.removeChild(tip);
i--;
/*
var tipAry=new Array();
var inputAry=new Array();
for(j=0;j<parent.childNodes.length;j++)
{
var node=parent.childNodes[j];
if(node.nodeType==1)
{
if(node.getAttribute("idi"))
{
inputAry.push(node);
}
else if(node.getAttribute("idt"))
{
tipAry.push(node);
}
}
}
for(j=0;j<tipAry.length;j++)
{
var position=getPosition(tipAry[j]);
inputAry[j].style.top=position.top+"px";
inputAry[j].style.left=position.left+"px";
}
*/
var tipAry=rePlaceInput(parent);
if(i==0)
{
tipAry[i].innerHTML="添加一个附件";
}
}
else
{
parent.removeChild(child);
i--;
if(i==0)
{
tip.innerHTML="添加一个附件";
}
}
parent.setAttribute("count",i);
}
/* 添加移除项 */
function getRemove(form,node,tip)
{
var text="移除";
var span=document.createElement("span");
span.style.cssText="font:10px Arial;color:#00f;text-decoration:underline;";
span.innerHTML=text;
span.onclick=function(){removeChild(form,node,tip);}
return span;
}
/* firefox下的文件选择框 */
function createFirefoxInput(form,inputIndex)
{
var i=inputIndex?inputIndex:0;
var tip=i==0?getFirefoxTip(form):form.lastChild;
if(i==0)
{
form.appendChild(tip);
}
else
{
var inputDiv=document.createElement("div");
var input=document.createElement("input");
input.setAttribute("type","file");
input.setAttribute("name","file_"+i);
input.onchange=function(){
}
inputDiv.appendChild(input);
inputDiv.appendChild(getRemove(form,inputDiv,tip));
form.insertBefore(inputDiv,tip);
form.setAttribute("count",i);
tip.innerHTML="再添加一个附件";
}
}
/* firefox下的初始化函数 */
function initFirefox()
{
var form=document.forms['uploadForm'];
createFirefoxInput(form);
}
/* 获取指定元素在页面的位置 */
function getPosition(obj)
{
var top=0,left=0;
while(obj.offsetParent)
{
top+=obj.offsetTop;
left+=obj.offsetLeft;
obj=obj.offsetParent;
}
return {top:top,left:left};
}
/* IE下的附件添加提示 */
function getIeTip(form)
{
var str=parseInt(form.getAttribute("count"))>=0?"再添加一个附件":"添加一个附件";
var cssStr="font:12px Arial;color:#00f;text-decoration:underline";
var tipDiv=document.createElement("div");
tipDiv.style.cssText=cssStr;
tipDiv.innerHTML=str;
return tipDiv;
}
/*IE下的文件按选择显示*/
function updateIeInput(input,tip)
{
var parent=input.parentNode;
parent.style.zIndex=-2;
tip.style.textDecoration="none";
tip.style.color="#000000";
tip.style.fontWeight="bold";
tip.innerHTML=input.value;
tip.appendChild(getRemove(input.form,parent,tip));
}
/*创建IE下的文件选择框*/
function createIeInput(form,inputIndex)
{
var i=inputIndex?inputIndex:0;
var tip=getIeTip(form);
tip.setAttribute("idt",i)
form.appendChild(tip);
var inputDiv=document.createElement("div");
var input=document.createElement("input");
input.setAttribute("type","file");
input.setAttribute("name","file_"+i);
input.style.cssText="width:0";
input.onchange=function(){
createIeInput(this.form,parseInt(this.form.getAttribute("count"))+1);
updateIeInput(this,tip);
rePlaceInput(this.form);
}
inputDiv.appendChild(input);
inputDiv.setAttribute("idi",i);
var position=getPosition(tip);
inputDiv.style.cssText="position:absolute;top:"+position.top+"px;left:"+position.left+"px;filter:alpha(opacity=0);z-index:2";
form.appendChild(inputDiv);
form.setAttribute("count",i);
}
/* 重新置位*/
function rePlaceInput(parent)
{
var tipAry=new Array();
var inputAry=new Array();
for(j=0;j<parent.childNodes.length;j++)
{
var node=parent.childNodes[j];
if(node.nodeType==1)
{
if(node.getAttribute("idi"))
{
inputAry.push(node);
}
else if(node.getAttribute("idt"))
{
tipAry.push(node);
}
}
}
for(j=0;j<tipAry.length;j++)
{
var position=getPosition(tipAry[j]);
inputAry[j].style.top=position.top+"px";
inputAry[j].style.left=position.left+"px";
}
return tipAry;
}
/*初始化IE*/
function initIE()
{
var form=document.forms["uploadForm"];
createIeInput(form);
window.onresize=function(){
rePlaceInput(form);
}
}
/* 初始化 */
function init()
{
if(isIE())
{
initIE();
}
else
{
initFirefox();
}
}
</script>
</HEAD>
<BODY onload="init()">
<form name="uploadForm" action="/upload.do" target="upload" enctype="multipart/form-data" method="post">
</form>
<iframe name="upload" style="display:none"></iframe>
</BODY></HTML>
