mirror of
https://github.com/Erreur32/html5demos.git
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112 lines
3.6 KiB
HTML
112 lines
3.6 KiB
HTML
<title>Drag and drop, automatic upload</title>
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<style>
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#holder { border: 10px dashed #ccc; width: 300px; min-height: 300px; margin: 20px auto;}
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#holder.hover { border: 10px dashed #0c0; }
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#holder img { display: block; margin: 10px auto; }
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#holder p { margin: 10px; font-size: 14px; }
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meter { width: 100%; }
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meter:after { content: '%'; }
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.fail { background: #c00; padding: 2px; color: #fff; }
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[hidden] { display: none !important;}
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</style>
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<article>
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<div id="holder">
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</div>
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<p id="upload" hidden><label>Drag & drop not supported, but you can still upload via this input field:<br><input type="file"></label></p>
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<p id="filereader">File API & FileReader API not supported</p>
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<p id="formdata">XHR2's FormData is not supported</p>
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<p id="progress">XHR2's upload progress isn't supported</p>
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<p>Upload progress: <meter id="uploadprogress" min="0" max="100" value="0">0</meter></p>
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<p>Drag an image from your desktop on to the drop zone above to see the browser both render the preview, but also upload automatically to this server.</p>
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</article>
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<script>
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var holder = document.getElementById('holder'),
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tests = {
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filereader: typeof FileReader != 'undefined',
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dnd: 'draggable' in document.createElement('span'),
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formdata: !!window.FormData,
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progress: "upload" in new XMLHttpRequest
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},
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support = {
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filereader: document.getElementById('filereader'),
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formdata: document.getElementById('formdata'),
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progress: document.getElementById('progress')
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},
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acceptedTypes = {
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'image/png': true,
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'image/jpeg': true,
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'image/gif': true
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},
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progress = document.getElementById('uploadprogress'),
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fileupload = document.getElementById('upload');
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"filereader formdata progress".split(' ').forEach(function (api) {
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if (tests[api] === false) {
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support[api].className = 'fail';
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} else {
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support[api].hidden = true;
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}
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});
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function previewfile(file) {
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if (tests.filereader === true && acceptedTypes[file.type] === true) {
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var reader = new FileReader();
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reader.onload = function (event) {
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var image = new Image();
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image.src = event.target.result;
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image.width = 250; // a fake resize
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holder.appendChild(image);
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};
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reader.readAsDataURL(file);
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} else {
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holder.innerHTML += '<p>Uploaded ' + file.name + ' ' + (file.fileSize ? (file.fileSize/1024|0) + 'K' : '');
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console.log(file);
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}
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}
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function readfiles(files) {
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debugger;
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var formData = tests.formdata ? new FormData() : null;
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for (var i = 0; i < files.length; i++) {
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if (tests.formdata) formData.append('file', files[i]);
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previewfile(files[i]);
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}
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// now post a new XHR request
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if (tests.formdata) {
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var xhr = new XMLHttpRequest();
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xhr.open('POST', '/devnull.php');
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xhr.onload = function() {
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progress.value = progress.innerHTML = 100;
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};
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if (tests.progress) {
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xhr.upload.onprogress = function (event) {
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if (event.lengthComputable) {
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var complete = (event.loaded / event.total * 100 | 0);
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progress.value = progress.innerHTML = complete;
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}
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}
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}
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xhr.send(formData);
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}
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}
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if (tests.dnd) {
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holder.ondragover = function () { this.className = 'hover'; return false; };
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holder.ondragend = function () { this.className = ''; return false; };
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holder.ondrop = function (e) {
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this.className = '';
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e.preventDefault();
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readfiles(e.dataTransfer.files);
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}
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} else {
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fileupload.hidden = false;
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fileupload.querySelector('input').onchange = function () {
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readfiles(this.files);
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};
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}
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</script> |