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Compatible with the latest firefox, chrome and IE javascript image preview implementation code_javascript skills

WBOY
WBOYOriginal
2016-05-16 16:40:131128browse

Javascript implements client-side file selection and then the img tag loads the client-side image to implement image preview.

Test browsers: firefox6, firefox12, chrome 25.0.1364.172 m, IE6-IE10 are all compatible

Safari5.0.4 does not support the FileReader and file.files.item(0).getAsDataURL methods. There is no solution for the time being. You need to upload the file to the server and return the temporary file name and load it with the img tag. I don’t know whether subsequent safari versions support the FileReader object. .

The effect under IE10:

The effect under IE9:

Implementation source code: 

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="content-type" content="txt/html;charset=utf-8" />
<title>javascript实现IE,firefox客户端图片预览</title>
<script>
 //使用IE条件注释来判断是否IE6，通过判断userAgent不一定准确
 if (document.all) document.write('<!--[if lte IE 6]><script type="text/javascript">window.ie6= true<\/script><![endif]-->');
 // var ie6 = /msie 6/i.test(navigator.userAgent);//不推荐，有些系统的ie6 userAgent会是IE7或者IE8
 function change(picId,fileId) {
  var pic = document.getElementById(picId);
  var file = document.getElementById(fileId);
  if(window.FileReader){//chrome,firefox7+,opera,IE10,IE9，IE9也可以用滤镜来实现
   oFReader = new FileReader();
   oFReader.readAsDataURL(file.files[0]);
   oFReader.onload = function (oFREvent) {pic.src = oFREvent.target.result;};  
  }
  else if (document.all) {//IE8-
   file.select();
   var reallocalpath = document.selection.createRange().text//IE下获取实际的本地文件路径
   if (window.ie6) pic.src = reallocalpath; //IE6浏览器设置img的src为本地路径可以直接显示图片
   else { //非IE6版本的IE由于安全问题直接设置img的src无法显示本地图片，但是可以通过滤镜来实现，IE10浏览器不支持滤镜，需要用FileReader来实现，所以注意判断FileReader先
    pic.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod='image',src=\"" + reallocalpath + "\")";
    pic.src = 'data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACH5BAEAAAAALAAAAAABAAEAAAICRAEAOw==';//设置img的src为base64编码的透明图片，要不会显示红xx
   }
  }
  else if (file.files) {//firefox6-
   if (file.files.item(0)) {
    url = file.files.item(0).getAsDataURL();
    pic.src = url;
   }
  }
 }
</script>
</head>
<body>
<form name="form1" enctype="multipart/form-data"><table><tr>
<td> 草图1：</td>
<td >
<input type="file" name="file1" id="file1" onchange="change('pic1','file1')">
</td>
<tr>
<td>草图浏览1：</td>
<td>
<img src="images/px.gif" id="pic1" >
</td></tr><tr>
<td> 草图2：</td>
<td >
<input type="file" name="file2" id="file2" onchange="change('pic2','file2')">
</td>
<tr>
<td>草图浏览2：</td>
<td>
<img src="images/px.gif" id="pic2" >
</td></tr>
</table>
</form>
</body>
</html>

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