本地图片预览JS实现-优快云博客

本文链接：https://blog.youkuaiyun.com/adelyspace/article/details/119757053

注明：原文地址http://www.cnblogs.com/slyzly/articles/2411940.html，本人感谢作者

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<-html>

<-head>

<-title> New Document </title>

<-meta name="Generator" content="EditPlus">

<-meta name="Author" content="">

<-meta name="Keywords" content="">

<-meta name="Description" content="">

<-/head>

<-script type="text/javascript">

//js本地图片预览，兼容ie[6-9]、火狐、Chrome17+、Opera11+、Maxthon3、360浏览器

function PreviewImage(fileObj,imgPreviewId,divPreviewId){

var allowExtention=".jpg,.bmp,.gif,.png";//允许上传文件的后缀名document.getElementByIdx_x("hfAllowPicSuffix").value;

var extention=fileObj.value.substring(fileObj.value.lastIndexOf(".")+1).toLowerCase();

var browserVersion= window.navigator.userAgent.toUpperCase();

if(allowExtention.indexOf(extention)>-1){

if(fileObj.files){//兼容chrome、火狐7+、360浏览器5.5+等，应该也兼容ie10，HTML5实现预览

if(window.FileReader){

var reader = new FileReader();

reader.onload = function(e){

document.getElementByIdx_x(imgPreviewId).setAttribute("src",e.target.result);

}

reader.readAsDataURL(fileObj.files[0]);

}else if(browserVersion.indexOf("SAFARI")>-1){

alert("不支持Safari浏览器6.0以下版本的图片预览!");

}

}else if (browserVersion.indexOf("MSIE")>-1){//ie、360低版本预览

if(browserVersion.indexOf("MSIE 6")>-1){//ie6

document.getElementByIdx_x(imgPreviewId).setAttribute("src",fileObj.value);

}else{//ie[7-9]

fileObj.select();

if(browserVersion.indexOf("MSIE 9")>-1)

fileObj.blur();//不加上document.selection.createRange().text在ie9会拒绝访问

var newPreview =document.getElementByIdx_x(divPreviewId+"New");

if(newPreview==null){

newPreview =document_createElement_x("div");

newPreview.setAttribute("id",divPreviewId+"New");

newPreview.style.width = document.getElementByIdx_x(imgPreviewId).width+"px";

newPreview.style.height = document.getElementByIdx_x(imgPreviewId).height+"px";

newPreview.style.border="solid 1px #d2e2e2";

}

newPreview.style.filter="progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod='scale',src='" + document.selection.createRange().text + "')";

var tempDivPreview=document.getElementByIdx_x(divPreviewId);

tempDivPreview.parentNode.insertBefore(newPreview,tempDivPreview);

tempDivPreview.style.display="none";

}

}else if(browserVersion.indexOf("FIREFOX")>-1){//firefox

var firefoxVersion= parseFloat(browserVersion.toLowerCase().match(/firefox\/([\d.]+)/)[1]);

if(firefoxVersion<7){//firefox7以下版本

document.getElementByIdx_x(imgPreviewId).setAttribute("src",fileObj.files[0].getAsDataURL());

}else{//firefox7.0+

document.getElementByIdx_x(imgPreviewId).setAttribute("src",window.URL.createObjectURL(fileObj.files[0]));

}

}else{

document.getElementByIdx_x(imgPreviewId).setAttribute("src",fileObj.value);

}

}else{

alert("仅支持"+allowExtention+"为后缀名的文件!");

fileObj.value="";//清空选中文件

if(browserVersion.indexOf("MSIE")>-1){

fileObj.select();

document.selection.clear();

}

fileObj.outerHTML=fileObj.outerHTML;

}

</script>

<-body>

<-div id="divPreview">

<-img id="imgHeadPhoto" src="Images/Headphoto/noperson.jpg" style="width: 160px; height: 170px;border: solid 1px #d2e2e2;" alt="" />

<-/div>

<-input ID="fuHeadPhoto" type="text" onchange="PreviewImage(this,'imgHeadPhoto','divPreview')" size="20" />

<-/body>

<-/html>

图片本地预览，浏览器兼容