hide file input

HTML

<input type="file" id="file" style="display:none;" name="files" />
<output id="list"></output>

CSS

input[type="file"] {
    overflow: hidden;
    width: 6em;
}
.thumb {
    height: 75px;
    border: 1px solid #CCC;
    margin: 10px 5px 0 0;
}

JavaScript

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);