Titanium Appcelerator Multi File upload

Question

I'm Developing with Appcelerator SDK 1.6.2 for iOS 4.3

I'm trying to upload multiple files to a server, the problem is the number of files is dynamic and therefore cant be predetermined in the params of the XHR send.

If I pass one file in it works fine but I cant seem to figure out how to pass in many.

I've tried creating an array to hold the media elements but no dice.

var media = [];
for(var i = 0; i < sync.images.length; i++){
     media[i] = Titanium.Filesystem.getFile(sync.images[i].path).read();
}

xhr.send({
    media: media // no workie
//  media: media[1] workie
});

I found this article: http://developer.appcelerator.com/question/123794/multiple-file-upload-in-one-request

that assumes the following code should work:

 xhr.send({      
     'media[]': imageFile.read(),
     'media[]': imageFile2.read()
 });

however i'm uncertain how to obtain this dynamically due to the fact that the number of images transferred can vary

Suggestions would be great

Answer 1

I had this exact problem, and I ended up using the Object.defineProperty method. Here's how your code could be modified:

Change media into an object instead of an array, then iteratively define properties:

var media = {};

for(var i = 0; i < sync.images.length; i++){
    data_blob = Titanium.Filesystem.getFile(sync.images[i].path).read();
    data_key = 'image'+i;
    Object.defineProperty(media, data_key, {value: data_blob, enumerable: true});
}

xhr.send(media);

Here's the mozilla doc for defineProperty:

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/defineProperty?redirectlocale=en-US&redirectslug=JavaScript%2FReference%2FGlobal_Objects%2FObject%2FdefineProperty#Adding_properties_and_default_values