behavior-watch-anchor.js
da3a97240044stable

behavior-watch-anchor.js
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			/**
			* @provides javelin-behavior-phabricator-watch-anchor
			* @requires javelin-behavior
			* javelin-stratcom
			* javelin-dom
			* javelin-vector
			*/

			JX.behavior('phabricator-watch-anchor', function() {

			var highlighted;

			function highlight() {
			highlighted && JX.DOM.alterClass(highlighted, 'anchor-target', false);
			try {
			highlighted = JX.$('anchor-' + window.location.hash.replace('#', ''));
			} catch (ex) {
			highlighted = null;
			}
			highlighted && JX.DOM.alterClass(highlighted, 'anchor-target', true);
			}

			// Defer invocation so other listeners can update the document.
			function defer_highlight() {
			setTimeout(highlight, 0);
			}

			// In some cases, we link to an anchor but the anchor target ajaxes in
			// later. If it pops in within the first few seconds, jump to it.
			function try_anchor(anchor) {
			try {
			// If the anchor exists, assume the browser handled the jump.
			JX.$(anchor);
			defer_highlight();
			} catch (e) {
			var n = 50;
			var try_anchor_again = function () {
			try {
			window.scrollTo(0, JX.$V(JX.$(anchor)).y - 60);
			defer_highlight();
			} catch (e) {
			if (n--) {
			setTimeout(try_anchor_again, 100);
			}
			}
			};
			try_anchor_again();
			}
			}

			JX.Stratcom.listen('hashchange', null, try_anchor);

			var anchor = window.location.hash.replace('#', '');
			if (anchor) {
			try_anchor(anchor);
			}

			});