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behavior-transaction-comment-form.js
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			/**
			* @provides javelin-behavior-phabricator-transaction-comment-form
			* @requires javelin-behavior
			* javelin-dom
			* javelin-util
			* javelin-request
			* phabricator-shaped-request
			*/

			JX.behavior('phabricator-transaction-comment-form', function(config) {

			var form = JX.$(config.formID);

			var getdata = function() {
			var obj = JX.DOM.convertFormToDictionary(form);
			obj.__preview__ = 1;
			return obj;
			};

			var onresponse = function(response) {
			var panel = JX.$(config.panelID);
			if (!response.xactions.length) {
			JX.DOM.hide(panel);
			} else {
			JX.DOM.setContent(
			JX.$(config.timelineID),
			[
			JX.$H(response.spacer),
			JX.$H(response.xactions.join(response.spacer))
			]);
			JX.DOM.show(panel);
			}
			};

			if (config.showPreview) {
			var request = new JX.PhabricatorShapedRequest(
			config.actionURI,
			onresponse,
			getdata);
			var trigger = JX.bind(request, request.trigger);
			JX.DOM.listen(form, 'keydown', null, trigger);
			var always_trigger = function() {
			new JX.Request(config.actionURI, onresponse)
			.setData(getdata())
			.send();
			};
			JX.DOM.listen(form, 'shouldRefresh', null, always_trigger);

			request.start();
			}
			});