JavaScript 实现图片待下传预览
日期：2014-05-16 浏览次数：20493 次
JavaScript 实现图片待上传预览
<html>
<head></head>
<title>img preview</title>
<body onload="initImg()">
<form name="form5" id="form5" method="post" action="#">
<input type="hidden" name="num" id="num" value="0"/>
<input type="hidden" name="delImgId" id="delImgId"/>
<input type="file" name="file5" id="file5" onchange="preview5()"/> <br>
</form>
<div>
<span id="delImgButton" style="width:150px;height:20px;display:none;"><a href="#" onClick="delImg()">删除图片</a></span>
</div>
<input type="button" value="imgValue" onclick="imgV()">
</body>
</html>[/code="html"]
<html>
<head></head>
<script type="text/javascript">
function preview5(){
document.getElementById("delImgButton").style.display = "none";
var x = document.getElementById("file5");
if(!x || !x.value) return;
var patn = /\.jpg$|\.jpeg$|\.gif$|\.bmp$/i;
if(patn.test(x.value)){
var imgType = checkImgType(x.value);
var num = document.getElementById("num").value;
if(num==3){
alert("最多只能上传 3 张图片");return;
}
num++;
document.getElementById("num").value = num;
var img = "img"+num;
var y = document.getElementById(img);
if(y){
y.src = "file://localhost/" + x.value;
}else{
var imgObject=document.createElement("img");
imgObject.setAttribute("src","file://localhost/"+x.value);
imgObject.setAttribute("width","180");
imgObject.setAttribute("height","140");
imgObject.setAttribute("id",img);
imgObject.setAttribute("value",x.value);
var delSpan = document.getElementById("delImgButton");
//imgObject.setAttribute("onmouseover",function(){delSpan.style.display ="block"})
imgObject.setAttribute("onclick",function(){delSpan.style.display ="block";document.getElementById("delImgId").value=this.id;})
document.getElementById("form5").appendChild(imgObject);
}
}else{
alert("您选择的似乎不是图像文件。");
}
}
function checkImgType(img){
var jpgPatn = /\.jpg$|\.JPG$/i;
var jpegPatn = /\.jpeg$|\.JPEG$/i;
var gifPatn = /\.gif$|\.GIF$/i;
var bmpPatn = /\.bmp$|\.BMP$/i;
if(jpgPatn.test(img)){
return "jpg";
}else if(jpegPatn.test(img)){
return "jpeg";
}else if(gifPatn.test(img)){
return "gif";
}else if(bmpPatn.test(img)){
return "bmp";
}
}
function initImg(){
document.getElementById("num").value = 0 ;
}
function delImg(){
var imgId = document.getElementById("delImgId").value;
var remImgObjcet = document.getElementById(imgId);
document.getElementById("delImgButton").style.display = "none";
document.getElementById("form5").removeChild(remImgObjcet);
var returnId = imgId.substring(imgId.length,imgId.length-1);
document.getElementById("num").value = parseInt(returnId)-1;
}
function imgV(){
var i = document.getElementById("img1").value;
alert(i);
}
</script> <title>img preview</title>
<body onload="initImg()">
<form name="form5" id="form5" method="post" action="#">
<input type="hidden" name="num" id="num" value="0"/>
<input type="hidden" name="delImgId" id="delImgId"/>
<input type="file" name="file5" id="file5" onchange="preview5()"/> <br>
</form>
<div>
<span id="delImgButton" style="width:150px;height:20px;display:none;"><a href="#" onClick="delImg()">删除图片</a></span>
</div>
<input type="button" value="imgValue" onclick="imgV()">
</body>
</html>[/code="html"]
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