HTML input type=file, get the image before submitt

2019-01-07 09:39发布

站内问答 / JavaScript
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I'm building a basic social network and in the registration the user uploads a display image. Basically I wanted to display the image, like a preview on the same page as the form, just after they select it and before the form is submitted.

Is this possible?

7条回答
淡お忘
2楼-- · 2019-01-07 10:42

Here is the complete example for previewing image before it gets upload.

HTML :

<html>
<head>
<link class="jsbin" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1/themes/base/jquery-ui.css" rel="stylesheet" type="text/css" />
<script class="jsbin" src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<script class="jsbin" src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.0/jquery-ui.min.js"></script>
<meta charset=utf-8 />
<title>JS Bin</title>
<!--[if IE]>
<script src="http://goo.gl/r57ze"></script>
<![endif]-->
</head>
<body>
<input type='file' onchange="readURL(this);" />
<img id="blah" src="#" alt="your image" />
</body>
</html>

JavaScript :

function readURL(input) {
  if (input.files && input.files[0]) {
    var reader = new FileReader();
    reader.onload = function (e) {
      $('#blah')
        .attr('src', e.target.result)
        .width(150)
        .height(200);
    };
    reader.readAsDataURL(input.files[0]);
  }
}
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