使用 FileReader 讓網頁圖片上傳前預覽

From: http://stackoverflow.com/questions/4459379/preview-an-image-before-it-is-uploaded

Please take a look at the sample JS code below:

JS code with jQuery:

<script type="text/javascript">
        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]);
            }
        }
    </script>

and the associated HTML:

<body>
    <form id="form1" runat="server">
        <input type='file' onchange="readURL(this);" />
        <img id="blah" src="#" alt="your image" />
    </form>
</body>

 

參考:FileReader

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