实现图片的上传

HTML布局：

<label for="thumbnail" class="col-md-3 control-label">缩略图</label>
<div class="col-md-6">
 <input type="file" class="form-control" id="thumbnail" name="thumbnail">
</div>

jquery方式，IE不支持，但IE会获得绝对的上传路径信息：

function getObjectURL(file) {
 var url = null ;
 if (window.createObjectURL!=undefined) { // basic
 url = window.createObjectURL(file) ;
 } else if (window.URL!=undefined) { // mozilla(firefox)
 url = window.URL.createObjectURL(file) ;
 } else if (window.webkitURL!=undefined) { // webkit or chrome
 url = window.webkitURL.createObjectURL(file) ;
 }
 return url ;
}
 
$('#thumbnail').change(function() {
 var eImg = $('<img />');
 eImg.attr('src', getObjectURL($(this)[0].files[0])); // 或 this.files[0] this->input
 $(this).after(eImg);});

image.png

网上找一份可用的代码非常不易，经过不断的筛选总结才得出兼容所有的文件上传显示

HTML布局

<form action='' method='post' name='myform'>
 <input type='file' id='iptfileupload' onchange='show()' value='' />
 <img src='1.jpg' alt='' id='img' />
</form>

JS代码：

<script type="text/javascript">
 function getPath(obj,fileQuery,transImg) {
 
  var imgSrc = '', imgArr = [], strSrc = '' ;
 
  if(window.navigator.userAgent.indexOf("MSIE")>=1){ // IE浏览器判断
  if(obj.select){
   obj.select();
   var path=document.selection.createRange().text;
   alert(path) ;
   obj.removeAttribute("src");
   imgSrc = fileQuery.value ;
   imgArr = imgSrc.split('.') ;
   strSrc = imgArr[imgArr.length - 1].toLowerCase() ;
   if(strSrc.localeCompare('jpg') === 0 || strSrc.localeCompare('jpeg') === 0 || strSrc.localeCompare('gif') === 0 || strSrc.localeCompare('png') === 0){
   obj.setAttribute("src",transImg);
   obj.style.filter=
    "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='"+path+"', sizingMethod='scale');"; // IE通过滤镜的方式实现图片显示
   }else{
   //try{
   throw new Error('File type Error! please image file upload..'); 
   //}catch(e){
   // alert('name: ' + e.name + 'message: ' + e.message) ;
   //}
   }
  }else{
   // alert(fileQuery.value) ;
   imgSrc = fileQuery.value ;
   imgArr = imgSrc.split('.') ;
   strSrc = imgArr[imgArr.length - 1].toLowerCase() ;
   if(strSrc.localeCompare('jpg') === 0 || strSrc.localeCompare('jpeg') === 0 || strSrc.localeCompare('gif') === 0 || strSrc.localeCompare('png') === 0){
   obj.src = fileQuery.value ;
   }else{
   //try{
   throw new Error('File type Error! please image file upload..') ;
   //}catch(e){
   // alert('name: ' + e.name + 'message: ' + e.message) ;
   //}
   }
 
  }
 
  } else{
  var file =fileQuery.files[0];
  var reader = new FileReader();
  reader.onload = function(e){
 
   imgSrc = fileQuery.value ;
   imgArr = imgSrc.split('.') ;
   strSrc = imgArr[imgArr.length - 1].toLowerCase() ;
   if(strSrc.localeCompare('jpg') === 0 || strSrc.localeCompare('jpeg') === 0 || strSrc.localeCompare('gif') === 0 || strSrc.localeCompare('png') === 0){
   obj.setAttribute("src", e.target.result) ;
   }else{
   //try{
   throw new Error('File type Error! please image file upload..') ;
   //}catch(e){
   // alert('name: ' + e.name + 'message: ' + e.message) ;
   //}
   }
 
   // alert(e.target.result); 
  }
  reader.readAsDataURL(file);
  }
 }
 
 function show(){
  //以下即为完整客户端路径
  var file_img=document.getElementById("img"),
  iptfileupload = document.getElementById('iptfileupload') ;
  getPath(file_img,iptfileupload,file_img) ;
 }
 </script>