js实现图片上传前的预览,实现完美兼容Firefox3,IE6,IE7,IE8和IE9的显示问题

 1 <script type="text/javascript" language="javascript">
 2 function PreviewImg(imgFile){
 3      document.getElementById("idImg").style.display = "none";//隐藏初始化图片的显示,让过滤器显示
 4      var newPreview=document.getElementById("newPreview");
 5      remove(newPreview);
 6      
 7      var imgDiv=document.createElement("div");
 8      document.body.appendChild(imgDiv);
 9      imgDiv.style.filter="progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale)";
10      imgDiv.filters.item("DXImageTransform.Microsoft.AlphaImageLoader").src=imgFile.target.value;
11         var img_object = document.getElementById("engineroom_layout_addr");
12         img_object.style.display = "inline";
13         img_object.src = addrObject.value;
14         if (!img_object.width || img_object.width > 300) {
15             imgDiv.style.width = "300px";
16         }
17         if (!img_object.height || img_object.height > 200) {
18             imgDiv.style.height = "200px";
19         }
20         addrObject.style.display = "none";
21      //imgDiv.style.width="320px";
22      //imgDiv.style.height="127px";
23      newPreview.appendChild(imgDiv);
24      
25 }
26 //使用removeChild从文档中删除DOM节点
27 function remove(obj) {
28     var test = obj;
29     var children = test.childNodes;
30     for (i = 0; i < children.length; i++) {
31         test.removeChild(children[i]);
32     }
33 }
34 </script>

 1 <div style="padding:5px;margin-left: -5px">
 2         <table border="0" style="width:94%;border-collapse:collapse;background:#fff;"  title="无显示帮助：第一步：工具-- Internet选项-- 安全-- 自定义级别;第二步：向下拖，一直看到“将文件上载到服务器时包含本地目录路径”;第三步：选择启用。">
 3             <tr>
 4                 <th style="background-color:#f0f0f0; height:20px;padding:5px;border:1px solid #ccc;font-weight: bolder;text-align: center;" width="40%">选择图片</th>
 5                 <th style="background-color:#f0f0f0; height:20px;padding:5px;border:1px solid #ccc;font-weight: bolder;text-align: center;" width="70%">预览图</th>
 6             </tr>
 7             <tr>
 8                 <td style="padding:5px;border:1px solid #ccc;"><INPUT id=engineroom_layout_addr class=inputbox name=engineroom_layout_addr/></td>
 9                 <td align="center" style="padding:5px;border:1px solid #ccc;"><img id="idImg" style="display:none"/><div id="newPreview"></div></td>
10             </tr>
11         </table>
12         <script type="text/javascript">
13             var addrObject = document.getElementById("engineroom_layout_addr");
14             addrObject.style.display = "none";//把机房显示输入框隐藏
15             Ext.get(‘file_engineroom_layout_addr‘).on(‘change‘,function(obj){
16                 //crmsUtil.previewImg(obj.target,"idImg",300,200);//只适用于IE6
17                 PreviewImg(obj);
18             });
19             if(addrObject.value != ‘‘){
20                 var img_object = document.getElementById("idImg");
21                 img_object.style.display = "inline";
22                 img_object.src = addrObject.value;
23                 if (!img_object.width || img_object.width > 300) {
24                     img_object.width = 300;
25                 }
26                 if (!img_object.height || img_object.height > 200) {
27                     img_object.height = 200;
28                 }
29             }
30         </script>
31         </div>