HTML5: Offline upload of images
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| /*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); | |
| }); | |
| }); |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| <!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
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
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.