django ajax selects - Page 494

Safely defining variables for public callback functions in javascript

- by djreed

I am working with the YouTube iFrame API to embed a number of videos on a page. Documentation here: https://developers.google.com/youtube/iframe_api_reference#Requirements In summary, you load the API asynchronously using the following snippet: var tag = document.createElement('script'); tag.src = "http://www.youtube.com/player_api"; var firstScriptTag = document.getElementsByTagName('script')[0]; firstScriptTag.parentNode.insertBefore(tag, firstScriptTag); Once loaded, the API fires the predefined callback function onYouTubePlayerAPIReady. For additional context: I am defining a library file for this in Google Closure. I am providing a namespace: goog.provide('yt.video'); I then use goog.exportSymbol so that the API can find the function. That all works fine. My challenge is that I would like to pass 2 variables to the callback function. Is there any way to do this without defining these 2 variables in the context of the window object? goog.provide('yt.video'); goog.require('goog.dom'); yt.video = function(videos, locales) { this.videos = videos; this.captionLocales = locales; this.init(); }; yt.video.prototype.init = function() { var tag = document.createElement('script'); tag.src = "http://www.youtube.com/player_api"; var firstScriptTag = document.getElementsByTagName('script')[0]; firstScriptTag.parentNode.insertBefore(tag, firstScriptTag); }; /* * Callback function fired when YT API is ready * This is exported using goog.exportSymbol in another file and * is being fired by the API properly. */ yt.video.prototype.onPlayerReady = function(videos, locales) { window.console.log('this :' + this); //logs window window.console.log('this.videos : ' + this.videos); //logs undefined /* * Video settings from Django variable */ for(i=0; i<this.videos.length; i++) { var playerEvents = {}; var embedVars = {}; var el = this.videos[i].el; var playerVid = this.videos[i].vid; var playerWidth = this.videos[i].width; var playerHeight = this.videos[i].height; var captionLocales = this.videos[i].locales; if(this.videos[i].playerVars) var embedVars = this.videos[i].playerVars; } if(this.videos[i].events) { var playerEvents = this.videos[i].events; } /* * Show captions by default */ if(goog.array.indexOf(captionLocales, 'es') >= 0) { embedVars.cc_load_policy = 1; }; new YT.Player(el, { height: playerHeight, width: playerWidth, videoId: playerVid, events: playerEvents, playerVars: embedVars }); }; }; To intialize this, I am currently using the following within a self-executing anonymous function: var videos = [ {"vid": "video_id", "el": "player-1", "width": 640, "height": 390, "locales": ["es", "fr"], "events": {"onStateChange": stateChanged}}, {"vid": "video_id", "el": "player-2", "locales": ["es", "fr"], "width": 640, "height": 390} ]; var locales = ['es']; var videoTemplate = new yt.video(videos, locales);

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