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JS 图片上传预览

112330 JS | 2015-1-18

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


<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title></title>
</head>
<body>
<div id="divPreview">
      <img id="imgHeadPhoto" src="C:\Users\Kenny\Desktop\temp\guaguaka.gif"   alt="" />
</div>
<input type="file" onchange="PreviewImage(this,'imgHeadPhoto','divPreview')" size="20"/>

<script type="text/javascript">
//js本地图片预览，兼容ie[6-9]、火狐、Chrome17+、Opera11+、Maxthon3
function PreviewImage(fileObj,imgPreviewId,divPreviewId){
    var allowExtention=".jpg,.bmp,.gif,.png";//允许上传文件的后缀名document.getElementById("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){//HTML5实现预览，兼容chrome、火狐7+等
            if(window.FileReader){
                var reader = new FileReader(); 
                reader.onload = function(e){
                    document.getElementById(imgPreviewId).setAttribute("src",e.target.result);
                }  
                reader.readAsDataURL(fileObj.files[0]);
            }else if(browserVersion.indexOf("SAFARI")>-1){
                alert("不支持Safari6.0以下浏览器的图片预览!");
            }
        }else if (browserVersion.indexOf("MSIE")>-1){
            if(browserVersion.indexOf("MSIE 6")>-1){//ie6
                document.getElementById(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.getElementById(divPreviewId+"New");
                if(newPreview==null){
                    newPreview =document.createElement("div");
                    newPreview.setAttribute("id",divPreviewId+"New");
                    newPreview.style.width = document.getElementById(imgPreviewId).width+"px";
                    newPreview.style.height = document.getElementById(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.getElementById(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.getElementById(imgPreviewId).setAttribute("src",fileObj.files[0].getAsDataURL());
            }else{//firefox7.0+                    
                document.getElementById(imgPreviewId).setAttribute("src",window.URL.createObjectURL(fileObj.files[0]));
            }
        }else{
            document.getElementById(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>
</html>


该方法在实际使用中，在APP上发现存在问题，相关问题请参考：JS图片上传预览 Android上的问题 http://javacui.com/javascript/381.html。 


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