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HTML5: Offline upload of images
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| /*global $ */ | |
| $(function () { | |
| 'use strict'; | |
| var SIZE = 100 * 1024 * 1024; // 100 MB | |
| var errorFct = function (e) { | |
| console.error(e); | |
| }; | |
| var getFileSystem = function (successFct) { | |
| navigator.webkitPersistentStorage.requestQuota(SIZE, function () { | |
| window.webkitRequestFileSystem(window.PERSISTENT, SIZE, successFct, errorFct); | |
| }, errorFct); | |
| }; | |
| var createTempName = function () { | |
| return 'temp.name.dummy.jpg'; | |
| }; | |
| var addToSyncQueue = function (filename) { | |
| // adding to sync queue | |
| console.log('Adding to queue', filename); | |
| }; | |
| var showImage = function (fileName) { | |
| var src = 'filesystem:' + window.location.origin + '/persistent/' + fileName; | |
| var img = $('<img />').attr('src', src); | |
| $('.js-image-container').append(img); | |
| }; | |
| var readImage = function (fileName, successFct) { | |
| getFileSystem(function (fileSystem) { | |
| fileSystem.root.getFile(fileName, {}, function (fileEntry) { | |
| fileEntry.file(successFct, errorFct); | |
| }, errorFct); | |
| } | |
| ); | |
| }; | |
| var writeSuccessFull = function () { | |
| addToSyncQueue(fileName); | |
| showImage(fileName); | |
| }; | |
| function writeImage(fileName, file) { | |
| getFileSystem(function (fileSystem) { | |
| fileSystem.root.getFile(fileName, {create: true}, function (fileEntry) { | |
| fileEntry.createWriter(function (fileWriter) { | |
| fileWriter.onwriteend = writeSuccessFull; | |
| fileWriter.onerror = errorFct; | |
| fileWriter.write(file); | |
| }, errorFct); | |
| }); | |
| }); | |
| } | |
| $(document).on('change', '.js-image-upload', function (event) { | |
| var file = event.target.files[0]; | |
| var fileName = createTempName(file); | |
| writeImage(fileName, file); | |
| }); | |
| }); |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script> | |
| <script src="application.js"></script> | |
| <title></title> | |
| </head> | |
| <body> | |
| <input type="file" accept="image/*" class="js-image-upload"/> | |
| <div class="js-image-container"></div> | |
| </body> | |
| </html> |
Hello Nice Article.
What can i do for deleting the image
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Hey Johannes, great work mate! I only just found this via your blog post, have been looking for a solution like this for sites/apps running entirely offline via a USB (for long-distance users with no internet connection). Really good work.
Only enhancement I could suggest is if we were able to serve the image file as a thumbnail, so there's a visual representation instead of a filename. If I get time I'll try it myself and fork it.