上传之前先预览一张图片

Question

I want to be able to preview a file (image) before it is uploaded. The preview action should be executed all in the browser without using Ajax to upload the image.

How can I do this?

转载于:https://stackoverflow.com/questions/4459379/preview-an-image-before-it-is-uploaded

Answer 1

Please take a look at the sample code below:

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);
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form id="form1" runat="server">
  <input type='file' id="imgInp" />
  <img id="blah" src="#" alt="your image" />
</form>

Also, you can try this sample here.

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