behavior-doorkeeper-tag.js
2ef10fbe5762stable

behavior-doorkeeper-tag.js
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			/**
			* @provides javelin-behavior-doorkeeper-tag
			* @requires javelin-behavior
			* javelin-dom
			* javelin-json
			* javelin-workflow
			* javelin-magical-init
			*/

			JX.behavior('doorkeeper-tag', function(config, statics) {
			statics.tags = (statics.tags \|\| []).concat(config.tags);
			statics.cache = statics.cache \|\| {};

			// NOTE: We keep a cache in the browser of external objects that we've already
			// looked up. This is mostly to keep previews from being flickery messes.

			var load = function() {
			var tags = statics.tags;
			statics.tags = [];

			if (!tags.length) {
			return;
			}

			var have = [];
			var need = [];
			var keys = {};

			var draw = function(tags) {
			for (var ii = 0; ii < tags.length; ii++) {
			try {
			JX.DOM.replace(JX.$(tags[ii].id), JX.$H(tags[ii].markup));
			} catch (ignored) {
			// The tag may have been wiped out of the body by the time the
			// response returns, for whatever reason. That's fine, just don't
			// bother drawing it.
			}
			statics.cache[keys[tags[ii].id]] = tags[ii].markup;
			}
			};

			for (var ii = 0; ii < tags.length; ii++) {
			var key_parts = [];

			key_parts = key_parts.concat(tags[ii].ref);
			key_parts.push(tags[ii].view);

			var tag_key = key_parts.join(' ');

			if (tag_key in statics.cache) {
			have.push(
			{
			id: tags[ii].id,
			markup: statics.cache[tag_key]
			});
			} else {
			need.push(tags[ii]);
			keys[tags[ii].id] = tag_key;
			}
			}

			if (have.length) {
			draw(have);
			}

			if (need.length) {
			var data = {
			tags: JX.JSON.stringify(need)
			};

			new JX.Workflow('/doorkeeper/tags/', data)
			.setHandler(function(r) { draw(r.tags); })
			.start();
			}
			};

			JX.onload(load);
			});