Facebook Post To Feed functionality for Javascript with data attribute overrides

post_to_feed.js

/*global $:false */
/*global FB:false */

function postToFeed(sourceObj) {

	// using code from https://developers.facebook.com/docs/reference/dialogs/feed/

	// calling the API ...
	var obj = {
		method: 'feed',
		link: '{url}',
		picture: '{photo.png}',
		name: '{site_name}',
		caption: '{site_caption}',
		description: '{site_description}'
	};

	// check for optional overrides to obj
	var props = ['description','link','picture'];
	var getProp = function(propname,src){
		return $(src).attr('data-facebook-' + propname);
	};
	var setProp = function(propname,propvalue){
		if(propvalue !== undefined){
			if(propvalue !== ''){
				obj[propname] = propvalue;
				return true;
			}
		}
		return false;
	};
	for (var i = 0; i < props.length; i+= 1) {
		setProp(props[i],getProp(props[i], sourceObj));
	}

	function callback(response) {
		// handle response
		// document.getElementById('msg').innerHTML = "Post ID: " + response['post_id'];
	}

	FB.ui(obj, callback);
	return false;
}


// Initialization of ui elements

// Facebook post functionality
FB.init({appId: "{app_id}", status: true, cookie: true});
$('.facebook-icon').on('click.fbshare',function(){
	postToFeed(this);
});

Requires FB api