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http://*.com/questions/14069421/show-an-image-preview-before-upload
<input type="file" id="files" />
<img id="image" /> <script type="text/javascript">
document.getElementById("files").onchange = function () {
var reader = new FileReader(); reader.onload = function (e) {
// get loaded data and render thumbnail.
document.getElementById("image").src = e.target.result;
}; // read the image file as a data URL.
reader.readAsDataURL(this.files[0]);
};
</script>
https://developer.mozilla.org/en-US/docs/Web/API/FileReader/readAsDataURL
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="Generator" content="EditPlus®">
<meta name="Author" content="">
<meta name="Keywords" content="">
<meta name="Description" content="">
<title>Document</title>
</head>
<body>
<input id="browse" type="file" onchange="previewFiles()" multiple>
<div id="preview"></div> </body>
</html> <script type="text/javascript">
<!-- function previewFiles() { var preview = document.querySelector('#preview');
var files = document.querySelector('input[type=file]').files; function readAndPreview(file) { // Make sure `file.name` matches our extensions criteria
if ( /\.(jpe?g|png|gif)$/i.test(file.name) ) {
var reader = new FileReader(); reader.addEventListener("load", function () {
var image = new Image();
image.height = 100;
image.title = file.name;
image.src = this.result;
preview.appendChild( image );
}, false); reader.readAsDataURL(file);
} } if (files) {
[].forEach.call(files, readAndPreview);
} } //-->
</script>