js本地图片预览 

 1 <div id="divPreview">
 2      <img id="imgHeadPhoto" src="Images/Headphoto/noperson.jpg" style="width: 160px; height: 170px;border: solid 1px #d2e2e2;" alt="" />
 3 </div>
 4 <input type="file" id="fuHeadPhoto" onchange="PreviewImage(this,'imgHeadPhoto','divPreview')">
 5 <script type="text/javascript">
 6 //js本地图片预览，兼容ie[6-9]、火狐、Chrome17+、Opera11+、Maxthon3、360浏览器
 7 function PreviewImage(fileObj,imgPreviewId,divPreviewId){
 8     var allowExtention=".jpg,.bmp,.gif,.png";//允许上传文件的后缀名document.getElementById("hfAllowPicSuffix").value;
 9     var extention=fileObj.value.substring(fileObj.value.lastIndexOf(".")+1).toLowerCase();            
10     var browserVersion= window.navigator.userAgent.toUpperCase();
11     if(allowExtention.indexOf(extention)>-1){ 
12         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
13             if(window.FileReader){
14                 var reader = new FileReader(); 
15                 reader.onload = function(e){
16                     document.getElementById(imgPreviewId).setAttribute("src",e.target.result);
17                 }  
18                 reader.readAsDataURL(fileObj.files[0]);
19             }else if(browserVersion.indexOf("SAFARI")>-1){
20                 alert("不支持Safari浏览器6.0以下版本的图片预览!");
21             }
22         }else if (browserVersion.indexOf("MSIE")>-1){//ie、360低版本预览
23             if(browserVersion.indexOf("MSIE 6")>-1){//ie6
24                 document.getElementById(imgPreviewId).setAttribute("src",fileObj.value);
25             }else{//ie[7-9]
26                 fileObj.select();
27                 if(browserVersion.indexOf("MSIE 9")>-1)
28                     fileObj.blur();//不加上document.selection.createRange().text在ie9会拒绝访问
29                 var newPreview =document.getElementById(divPreviewId+"New");
30                 if(newPreview==null){
31                     newPreview =document.createElement("div");
32                     newPreview.setAttribute("id",divPreviewId+"New");
33                     newPreview.style.width = document.getElementById(imgPreviewId).width+"px";
34                     newPreview.style.height = document.getElementById(imgPreviewId).height+"px";
35                     newPreview.style.border="solid 1px #d2e2e2";
36                 }
37                 newPreview.style.filter="progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod='scale',src='" + document.selection.createRange().text + "')";                            
38                 var tempDivPreview=document.getElementById(divPreviewId);
39                 tempDivPreview.parentNode.insertBefore(newPreview,tempDivPreview);
40                 tempDivPreview.style.display="none";                    
41             }
42         }else if(browserVersion.indexOf("FIREFOX")>-1){//firefox
43             var firefoxVersion= parseFloat(browserVersion.toLowerCase().match(/firefox\/([\d.]+)/)[1]);
44             if(firefoxVersion<7){//firefox7以下版本
45                 document.getElementById(imgPreviewId).setAttribute("src",fileObj.files[0].getAsDataURL());
46             }else{//firefox7.0+                    
47                 document.getElementById(imgPreviewId).setAttribute("src",window.URL.createObjectURL(fileObj.files[0]));
48             }
49         }else{
50             document.getElementById(imgPreviewId).setAttribute("src",fileObj.value);
51         }         
52     }else{
53         alert("仅支持"+allowExtention+"为后缀名的文件!");
54         fileObj.value="";//清空选中文件
55         if(browserVersion.indexOf("MSIE")>-1){                        
56             fileObj.select();
57             document.selection.clear();
58         }                
59         fileObj.outerHTML=fileObj.outerHTML;
60     }
61 }
62 </script>

 

posted @ 2013-11-07 15:56  幻星宇  阅读(805)  评论(0)    收藏  举报