behavior-watch-anchor.js
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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() {
	var anchor = window.location.hash.replace('#', '');
	try {
	// If the anchor exists, assume the browser handled the jump.
	if (anchor) {
	JX.$(anchor);
	}
	defer_highlight();
	} catch (e) {
	var n = 50;
	var try_anchor_again = function () {
	try {
	var node = JX.$(anchor);
	var pos = JX.Vector.getPosWithScroll(node);
	JX.DOM.scrollToPosition(0, pos.y - 60);
	defer_highlight();
	} catch (e) {
	if (n--) {
	setTimeout(try_anchor_again, 100);
	}
	}
	};
	try_anchor_again();
	}
	}

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

	});