Upload multiple photos in batch to Facebook using Javascript SDK - javascript

I can upload single photos via URL to Facebook, but I'm having trouble doing it using batch. I'm getting the (#324) Requires Upload File uncaught exception. I'm ensuring the user is logged in and when I look at the batch payload (batchJson) it looks okay.
To be clear, if I remove all the batch-related setup code and in the FB.api call replace "batch" : batchJson with a single "url": photoUrl the code works.
Here's my code. TIA for any insight on my error:
var message = $("#message-fb").val();
var batchItems = [];
var photoUrl = "";
$(".photo-selected").each(function () {
photoUrl = $(this).data('content');
item = {};
item['method'] = 'POST';
item['relative_url'] = 'me/photos';
item['url'] = encodeURI(photoUrl);
item['caption'] = message;
batchItems.push(item);
});
batchJson = JSON.stringify(batchItems);
alert(batchJson);
FB.getLoginStatus(function (response) {
if (response.status === 'connected') {
// Already logged in and authorized
FB.api(
"/",
"POST",
{
"batch": batchJson
},
function (response) {
if (response && !response.error) {
/* successful upload */
alert('Photos uploaded to Facebook (nl) - ' + JSON.stringify(response));
}
if (response && response.error) {
/* Provide error info during testing */
alert('Sorry, there was a problem uploading your photo to Facebook - ' + JSON.stringify(response));
}
});
} else {
// Need to login and authorize
FB.login(function () {
FB.api(
"/",
"POST",
{
'batch': batchJson
},
function (response) {
if (response && !response.error) {
/* successful upload */
alert('Photos uploaded to Facebook - ' + JSON.stringify(response));
}
if (response && response.error) {
/* Provide error info during testing */
alert('Sorry, there was a problem uploading your photo to Facebook - ' + JSON.stringify(response));
}
});
}, { scope: 'publish_actions' });
}
});
EDIT: Here are the relevant changes using #CBroe's answer:
$(".photo-selected").each(function () {
var photoUrl = $(this).data('content');
var item = {};
item['method'] = 'POST';
item['relative_url'] = 'me/photos';
var itemUrl = encodeURI(photoUrl);
var itemCaption = encodeURIComponent(message);
item['body'] = "caption=" + itemCaption + "&url=" + itemUrl;
batchItems.push(item);
});
batchJson = JSON.stringify(batchItems);

You are sending url and caption parameters on the same “level” as the method and relative_url – they need to be put inside a body property however. And the content of that field has to be encoded the same way an actual POST request via a form would be encoded (so like a URL query string, param1=value1&param2=value2).

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Instamojo also provides for webhooks, which are like silent POSTs in the background and can be used as backups in case redirect urls in front-end fail for some reason. This way if end-users' redirection failed for any reason, the webhook will still receive information in the background which can be used you to update your database for success/failure of transaction. Of course you webserver has to be up and running to receive webhooks notifications. If that's the point of failure, nothing will work :)
The API link I shared has all those details.
Thanks

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AAAFIDJXVUKcBABpW5pcU97CC7sTwdDmJykOKhZAykZC6D8gaTumTsDZBRzCfJ3eqc58R5whIFuGTBnPeeRGmn6N0ccBDLRGNKXJmy5ZCexTvjBqExTmI
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