上传前查看图片

Question

我需要在使用jquery上传之前显示上传图片,但在Chrome路径中显示如下虚假路径:

C:\fakepath\myImage.jpg

在Firefox中,它只显示文件名:

myImage.jpg

那么我怎样才能在上传之前预览我的图像文件

<input type="file">
<img src="" class="preview" />

如果这是不可能的......那么HTML5呢？

Answer 1

我不知道jQuery函数(抱歉),但HTML5可以实现,大多数浏览器都支持HTML5函数.我在HTML5rocks(1)中找到了一段代码:

<style>
  .thumb {
    height: 75px;
    border: 1px solid #000;
    margin: 10px 5px 0 0;
  }
</style>

<input type="file" id="files" name="files[]" multiple />
<output id="list"></output>

<script>
  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);
</script>

祝好运 :)

(1)HTML5rocks - 阅读文件:http://www.html5rocks.com/en/tutorials/file/dndfiles/