87

In my code, I am allowing the user to upload an image. Now I want to show this selected image as a preview in this same popup. How can I do it using jQuery?

The following is the input type I am using in my popup window.

HTML code:

<input type="file" name="uploadNewImage">
4

5 回答 5

217

演示

HTML：

 <form id="form1" runat="server">
   <input type='file' id="imgInp" />
   <img id="blah" src="#" alt="your image" />
</form>

jQuery

function readURL(input) {
    if (input.files && input.files[0]) {
        var reader = new FileReader();

        reader.onload = function (e) {
            $('#blah').attr('src', e.target.result);
        }

        reader.readAsDataURL(input.files[0]);
    }
}

$("#imgInp").change(function(){
    readURL(this);
});

参考

于 2013-08-27T05:19:18.050 回答
48

如果您使用的是 HTML5，请尝试以下代码片段

<img id="uploadPreview" style="width: 100px; height: 100px;" />
<input id="uploadImage" type="file" name="myPhoto" onchange="PreviewImage();" />
<script type="text/javascript">

    function PreviewImage() {
        var oFReader = new FileReader();
        oFReader.readAsDataURL(document.getElementById("uploadImage").files[0]);

        oFReader.onload = function (oFREvent) {
            document.getElementById("uploadPreview").src = oFREvent.target.result;
        };
    };

</script>
于 2013-08-27T05:24:18.897 回答
17

您可以使用URL.createObjectURL

    function img_pathUrl(input){
        $('#img_url')[0].src = (window.URL ? URL : webkitURL).createObjectURL(input.files[0]);
    }
#img_url {
  background: #ddd;
  width:100px;
  height: 90px;
  display: block;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<img src="" id="img_url" alt="your image">
<br>
<input type="file" id="img_file" onChange="img_pathUrl(this);">

于 2015-12-15T15:10:31.747 回答
2

只需检查我的脚本，它运行良好：

  function handleFileSelect(evt) {
    var files = evt.target.files; // FileList object

    // Loop through the FileList and render image files as thumbnails.
    for (var i = 0, f; f = files[i]; i++) {

      // Only process image files.
      if (!f.type.match('image.*')) {
        continue;
      }

      var reader = new FileReader();

      // Closure to capture the file information.
      reader.onload = (function(theFile) {
        return function(e) {
          // Render thumbnail.
          var span = document.createElement('span');
          span.innerHTML = ['<img class="thumb" src="', e.target.result,
                            '" title="', escape(theFile.name), '"/>'].join('');
          document.getElementById('list').insertBefore(span, null);
        };
      })(f);

      // Read in the image file as a data URL.
      reader.readAsDataURL(f);
    }
  }

  document.getElementById('files').addEventListener('change', handleFileSelect, false);

#list img{
  width: auto;
  height: 100px;
  margin: 10px ;
}
于 2016-06-15T12:38:00.927 回答
-2

您可以使用 ajax 上传来预览您选择的文件.. http://zurb.com/playground/ajax-upload

于 2013-08-27T05:12:27.163 回答