[GitHub] [cordova-plugin-file] maksymov commented on issue #364: Large file save freeze app for seconds

[GitBox <gi...@apache.org>]

maksymov commented on issue #364: Large file save freeze app for seconds
URL: https://github.com/apache/cordova-plugin-file/issues/364#issuecomment-612796542
 
 
   I have `<input type='file'>` in my form. Now I want to save selected file in `LocalFileSystem.PERSISTENT`.
   
   My code for that:
   
   ```javascript
   self.requestFileSystem(LocalFileSystem.PERSISTENT, 0, function (fs) {
     fs.root.getFile(file_name, { create: true, exclusive: false }, function (fileEntry) {
       var reader = new FileReader();
       reader.onloadend = function () {
         fileEntry.createWriter(function (fileWriter) {
           fileWriter.onwriteend = function () {};
           fileWriter.onerror = function (e) {};
           dataObj = new Blob([reader.result], { type: 'text/plain' });
           // freeze here
           fileWriter.write(dataObj);
           postMessage('ok');
         });
       };
       reader.readAsDataURL($(file_id)[0].files[0]);
     }, onErrorCreateFile);
   }, onErrorLoadFs);
   ```
   
   But this code freeze my UI on device (ios, android) up to 10 seconds when file is 30MB. I discovered the world of **Web Workers**, but there is no access to `LocalFileSystem`.
   
   How can I save selected file (`<input type='file'>`) to my `LocalFileSystem` without UI freezes?

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