DOM.js
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Created: Mon, Nov 4, 21:17

DOM.js
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	/**
	* @requires javelin-magical-init
	* javelin-install
	* javelin-util
	* javelin-vector
	* javelin-stratcom
	* @provides javelin-dom
	*
	* @javelin-installs JX.$
	* @javelin-installs JX.$N
	* @javelin-installs JX.$H
	*
	* @javelin
	*/


	/**
	* Select an element by its "id" attribute, like ##document.getElementById()##.
	* For example:
	*
	* var node = JX.$('some_id');
	*
	* This will select the node with the specified "id" attribute:
	*
	* LANG=HTML
	* <div id="some_id">...</div>
	*
	* If the specified node does not exist, @{JX.$()} will throw an exception.
	*
	* For other ways to select nodes from the document, see @{JX.DOM.scry()} and
	* @{JX.DOM.find()}.
	*
	* @param string "id" attribute to select from the document.
	* @return Node Node with the specified "id" attribute.
	*/
	JX.$ = function(id) {

	if (__DEV__) {
	if (!id) {
	JX.$E('Empty ID passed to JX.$()!');
	}
	}

	var node = document.getElementById(id);
	if (!node \|\| (node.id != id)) {
	if (__DEV__) {
	if (node && (node.id != id)) {
	JX.$E(
	'JX.$("'+id+'"): '+
	'document.getElementById() returned an element without the '+
	'correct ID. This usually means that the element you are trying '+
	'to select is being masked by a form with the same value in its '+
	'"name" attribute.');
	}
	}
	JX.$E("JX.$('" + id + "') call matched no nodes.");
	}

	return node;
	};

	/**
	* Upcast a string into an HTML object so it is treated as markup instead of
	* plain text. See @{JX.$N} for discussion of Javelin's security model. Every
	* time you call this function you potentially open up a security hole. Avoid
	* its use wherever possible.
	*
	* This class intentionally supports only a subset of HTML because many browsers
	* named "Internet Explorer" have awkward restrictions around what they'll
	* accept for conversion to document fragments. Alter your datasource to emit
	* valid HTML within this subset if you run into an unsupported edge case. All
	* the edge cases are crazy and you should always be reasonably able to emit
	* a cohesive tag instead of an unappendable fragment.
	*
	* You may use @{JX.$H} as a shortcut for creating new JX.HTML instances:
	*
	* JX.$N('div', {}, some_html_blob); // Treat as string (safe)
	* JX.$N('div', {}, JX.$H(some_html_blob)); // Treat as HTML (unsafe!)
	*
	* @task build String into HTML
	* @task nodes HTML into Nodes
	*/
	JX.install('HTML', {

	construct : function(str) {
	if (str instanceof JX.HTML) {
	this._content = str._content;
	return;
	}

	if (__DEV__) {
	if ((typeof str !== 'string') && (!str \|\| !str.match)) {
	JX.$E(
	'new JX.HTML(<empty?>): ' +
	'call initializes an HTML object with an empty value.');
	}

	var tags = ['legend', 'thead', 'tbody', 'tfoot', 'column', 'colgroup',
	'caption', 'tr', 'th', 'td', 'option'];
	var evil_stuff = new RegExp('^\\s*<(' + tags.join('\|') + ')\\b', 'i');
	var match = str.match(evil_stuff);
	if (match) {
	JX.$E(
	'new JX.HTML("<' + match[1] + '>..."): ' +
	'call initializes an HTML object with an invalid partial fragment ' +
	'and can not be converted into DOM nodes. The enclosing tag of an ' +
	'HTML content string must be appendable to a document fragment. ' +
	'For example, <table> is allowed but <tr> or <tfoot> are not.');
	}

	var really_evil = /<script\b/;
	if (str.match(really_evil)) {
	JX.$E(
	'new JX.HTML("...<script>..."): ' +
	'call initializes an HTML object with an embedded script tag! ' +
	'Are you crazy?! Do NOT do this!!!');
	}

	var wont_work = /<object\b/;
	if (str.match(wont_work)) {
	JX.$E(
	'new JX.HTML("...<object>..."): ' +
	'call initializes an HTML object with an embedded <object> tag. IE ' +
	'will not do the right thing with this.');
	}

	// TODO(epriestley): May need to deny <option> more broadly, see
	// http://support.microsoft.com/kb/829907 and the whole mess in the
	// heavy stack. But I seem to have gotten away without cloning into the
	// documentFragment below, so this may be a nonissue.
	}

	this._content = str;
	},

	members : {
	_content : null,
	/**
	* Convert the raw HTML string into a DOM node tree.
	*
	* @task nodes
	* @return DocumentFragment A document fragment which contains the nodes
	* corresponding to the HTML string you provided.
	*/
	getFragment : function() {
	var wrapper = JX.$N('div');
	wrapper.innerHTML = this._content;
	var fragment = document.createDocumentFragment();
	while (wrapper.firstChild) {
	// TODO(epriestley): Do we need to do a bunch of cloning junk here?
	// See heavy stack. I'm disconnecting the nodes instead; this seems
	// to work but maybe my test case just isn't extensive enough.
	fragment.appendChild(wrapper.removeChild(wrapper.firstChild));
	}
	return fragment;
	},

	/**
	* Convert the raw HTML string into a single DOM node. This only works
	* if the element has a single top-level element. Otherwise, use
	* @{method:getFragment} to get a document fragment instead.
	*
	* @return Node Single node represented by the object.
	* @task nodes
	*/
	getNode : function() {
	var fragment = this.getFragment();
	if (__DEV__) {
	if (fragment.childNodes.length < 1) {
	JX.$E('JX.HTML.getNode(): Markup has no root node!');
	}
	if (fragment.childNodes.length > 1) {
	JX.$E('JX.HTML.getNode(): Markup has more than one root node!');
	}
	}
	return fragment.firstChild;
	}

	}
	});


	/**
	* Build a new HTML object from a trustworthy string. JX.$H is a shortcut for
	* creating new JX.HTML instances.
	*
	* @task build
	* @param string A string which you want to be treated as HTML, because you
	* know it is from a trusted source and any data in it has been
	* properly escaped.
	* @return JX.HTML HTML object, suitable for use with @{JX.$N}.
	*/
	JX.$H = function(str) {
	return new JX.HTML(str);
	};


	/**
	* Create a new DOM node with attributes and content.
	*
	* var link = JX.$N('a');
	*
	* This creates a new, empty anchor tag without any attributes. The equivalent
	* markup would be:
	*
	* LANG=HTML
	* <a />
	*
	* You can also specify attributes by passing a dictionary:
	*
	* JX.$N('a', {name: 'anchor'});
	*
	* This is equivalent to:
	*
	* LANG=HTML
	* <a name="anchor" />
	*
	* Additionally, you can specify content:
	*
	* JX.$N(
	* 'a',
	* {href: 'http://www.javelinjs.com'},
	* 'Visit the Javelin Homepage');
	*
	* This is equivalent to:
	*
	* LANG=HTML
	* <a href="http://www.javelinjs.com">Visit the Javelin Homepage</a>
	*
	* If you only want to specify content, you can omit the attribute parameter.
	* That is, these calls are equivalent:
	*
	* JX.$N('div', {}, 'Lorem ipsum...'); // No attributes.
	* JX.$N('div', 'Lorem ipsum...') // Same as above.
	*
	* Both are equivalent to:
	*
	* LANG=HTML
	* <div>Lorem ipsum...</div>
	*
	* Note that the content is treated as plain text, not HTML. This means it is
	* safe to use untrusted strings:
	*
	* JX.$N('div', '<script src="evil.com" />');
	*
	* This is equivalent to:
	*
	* LANG=HTML
	* <div><script src="evil.com" /></div>
	*
	* That is, the content will be properly escaped and will not create a
	* vulnerability. If you want to set HTML content, you can use @{JX.HTML}:
	*
	* JX.$N('div', JX.$H(some_html));
	*
	* This is potentially unsafe, so make sure you understand what you're
	* doing. You should usually avoid passing HTML around in string form. See
	* @{JX.HTML} for discussion.
	*
	* You can create new nodes with a Javelin sigil (and, optionally, metadata) by
	* providing "sigil" and "meta" keys in the attribute dictionary.
	*
	* @param string Tag name, like 'a' or 'div'.
	* @param dict\|string\|@{JX.HTML}? Property dictionary, or content if you don't
	* want to specify any properties.
	* @param string\|@{JX.HTML}? Content string (interpreted as plain text)
	* or @{JX.HTML} object (interpreted as HTML,
	* which may be dangerous).
	* @return Node New node with whatever attributes and
	* content were specified.
	*/
	JX.$N = function(tag, attr, content) {
	if (typeof content == 'undefined' &&
	(typeof attr != 'object' \|\| attr instanceof JX.HTML)) {
	content = attr;
	attr = {};
	}

	if (__DEV__) {
	if (tag.toLowerCase() != tag) {
	JX.$E(
	'$N("'+tag+'", ...): '+
	'tag name must be in lower case; '+
	'use "'+tag.toLowerCase()+'", not "'+tag+'".');
	}
	}

	var node = document.createElement(tag);

	if (attr.style) {
	JX.copy(node.style, attr.style);
	delete attr.style;
	}

	if (attr.sigil) {
	JX.Stratcom.addSigil(node, attr.sigil);
	delete attr.sigil;
	}

	if (attr.meta) {
	JX.Stratcom.addData(node, attr.meta);
	delete attr.meta;
	}

	if (__DEV__) {
	if (('metadata' in attr) \|\| ('data' in attr)) {
	JX.$E(
	'$N(' + tag + ', ...): ' +
	'use the key "meta" to specify metadata, not "data" or "metadata".');
	}
	}

	JX.copy(node, attr);
	if (content) {
	JX.DOM.setContent(node, content);
	}
	return node;
	};


	/**
	* Query and update the DOM. Everything here is static, this is essentially
	* a collection of common utility functions.
	*
	* @task stratcom Attaching Event Listeners
	* @task content Changing DOM Content
	* @task nodes Updating Nodes
	* @task serialize Serializing Forms
	* @task test Testing DOM Properties
	* @task convenience Convenience Methods
	* @task query Finding Nodes in the DOM
	* @task view Changing View State
	*/
	JX.install('DOM', {
	statics : {
	_autoid : 0,
	_uniqid : 0,
	_metrics : {},


	/* -( Changing DOM Content )----------------------------------------------- */


	/**
	* Set the content of some node. This uses the same content semantics as
	* other Javelin content methods, see @{function:JX.$N} for a detailed
	* explanation. Previous content will be replaced: you can also
	* @{method:prependContent} or @{method:appendContent}.
	*
	* @param Node Node to set content of.
	* @param mixed Content to set.
	* @return void
	* @task content
	*/
	setContent : function(node, content) {
	if (__DEV__) {
	if (!JX.DOM.isNode(node)) {
	JX.$E(
	'JX.DOM.setContent(<yuck>, ...): '+
	'first argument must be a DOM node.');
	}
	}

	while (node.firstChild) {
	JX.DOM.remove(node.firstChild);
	}
	JX.DOM.appendContent(node, content);
	},


	/**
	* Prepend content to some node. This method uses the same content semantics
	* as other Javelin methods, see @{function:JX.$N} for an explanation. You
	* can also @{method:setContent} or @{method:appendContent}.
	*
	* @param Node Node to prepend content to.
	* @param mixed Content to prepend.
	* @return void
	* @task content
	*/
	prependContent : function(node, content) {
	if (__DEV__) {
	if (!JX.DOM.isNode(node)) {
	JX.$E(
	'JX.DOM.prependContent(<junk>, ...): '+
	'first argument must be a DOM node.');
	}
	}

	this._insertContent(node, content, this._mechanismPrepend, true);
	},


	/**
	* Append content to some node. This method uses the same content semantics
	* as other Javelin methods, see @{function:JX.$N} for an explanation. You
	* can also @{method:setContent} or @{method:prependContent}.
	*
	* @param Node Node to append the content of.
	* @param mixed Content to append.
	* @return void
	* @task content
	*/
	appendContent : function(node, content) {
	if (__DEV__) {
	if (!JX.DOM.isNode(node)) {
	JX.$E(
	'JX.DOM.appendContent(<bleh>, ...): '+
	'first argument must be a DOM node.');
	}
	}

	this._insertContent(node, content, this._mechanismAppend);
	},


	/**
	* Internal, add content to a node by prepending.
	*
	* @param Node Node to prepend content to.
	* @param Node Node to prepend.
	* @return void
	* @task content
	*/
	_mechanismPrepend : function(node, content) {
	node.insertBefore(content, node.firstChild);
	},


	/**
	* Internal, add content to a node by appending.
	*
	* @param Node Node to append content to.
	* @param Node Node to append.
	* @task content
	*/
	_mechanismAppend : function(node, content) {
	node.appendChild(content);
	},


	/**
	* Internal, add content to a node using some specified mechanism.
	*
	* @param Node Node to add content to.
	* @param mixed Content to add.
	* @param function Callback for actually adding the nodes.
	* @param bool True if array elements should be passed to the mechanism
	* in reverse order, i.e. the mechanism prepends nodes.
	* @return void
	* @task content
	*/
	_insertContent : function(parent, content, mechanism, reverse) {
	if (JX.isArray(content)) {
	if (reverse) {
	content = [].concat(content).reverse();
	}
	for (var ii = 0; ii < content.length; ii++) {
	JX.DOM._insertContent(parent, content[ii], mechanism, reverse);
	}
	} else {
	var type = typeof content;
	if (content instanceof JX.HTML) {
	content = content.getFragment();
	} else if (type == 'string' \|\| type == 'number') {
	content = document.createTextNode(content);
	}

	if (__DEV__) {
	if (content && !content.nodeType) {
	JX.$E(
	'JX.DOM._insertContent(<node>, ...): '+
	'second argument must be a string, a number, ' +
	'a DOM node or a JX.HTML instance');
	}
	}

	content && mechanism(parent, content);
	}
	},


	/* -( Updating Nodes )----------------------------------------------------- */


	/**
	* Remove a node from its parent, so it is no longer a child of any other
	* node.
	*
	* @param Node Node to remove.
	* @return Node The node.
	* @task nodes
	*/
	remove : function(node) {
	node.parentNode && JX.DOM.replace(node, null);
	return node;
	},


	/**
	* Replace a node with some other piece of content. This method obeys
	* Javelin content semantics, see @{function:JX.$N} for an explanation.
	* You can also @{method:setContent}, @{method:prependContent}, or
	* @{method:appendContent}.
	*
	* @param Node Node to replace.
	* @param mixed Content to replace it with.
	* @return Node the original node.
	* @task nodes
	*/
	replace : function(node, replacement) {
	if (__DEV__) {
	if (!node.parentNode) {
	JX.$E(
	'JX.DOM.replace(<node>, ...): '+
	'node has no parent node, so it can not be replaced.');
	}
	}

	var mechanism;
	if (node.nextSibling) {
	mechanism = JX.bind(node.nextSibling, function(parent, content) {
	parent.insertBefore(content, this);
	});
	} else {
	mechanism = this._mechanismAppend;
	}
	var parent = node.parentNode;
	parent.removeChild(node);
	this._insertContent(parent, replacement, mechanism);

	return node;
	},


	/* -( Serializing Forms )-------------------------------------------------- */


	/**
	* Converts a form into a list of <name, value> pairs.
	*
	* Note: This function explicity does not match for submit inputs as there
	* could be multiple in a form. It's the caller's obligation to add the
	* submit input value if desired.
	*
	* @param Node The form element to convert into a list of pairs.
	* @return List A list of <name, value> pairs.
	* @task serialize
	*/
	convertFormToListOfPairs : function(form) {
	var elements = form.getElementsByTagName('*');
	var data = [];
	for (var ii = 0; ii < elements.length; ++ii) {
	if (!elements[ii].name) {
	continue;
	}
	if (elements[ii].disabled) {
	continue;
	}
	var type = elements[ii].type;
	var tag = elements[ii].tagName;
	if ((type in {radio: 1, checkbox: 1} && elements[ii].checked) \|\|
	type in {text: 1, hidden: 1, password: 1, email: 1, tel: 1,
	number: 1} \|\|
	tag in {TEXTAREA: 1, SELECT: 1}) {
	data.push([elements[ii].name, elements[ii].value]);
	}
	}
	return data;
	},


	/**
	* Converts a form into a dictionary mapping input names to values. This
	* will overwrite duplicate inputs in an undefined way.
	*
	* @param Node The form element to convert into a dictionary.
	* @return Dict A dictionary of form values.
	* @task serialize
	*/
	convertFormToDictionary : function(form) {
	var data = {};
	var pairs = JX.DOM.convertFormToListOfPairs(form);
	for (var ii = 0; ii < pairs.length; ii++) {
	data[pairs[ii][0]] = pairs[ii][1];
	}
	return data;
	},


	/* -( Testing DOM Properties )--------------------------------------------- */


	/**
	* Test if an object is a valid Node.
	*
	* @param wild Something which might be a Node.
	* @return bool True if the parameter is a DOM node.
	* @task test
	*/
	isNode : function(node) {
	return !!(node && node.nodeName && (node !== window));
	},


	/**
	* Test if an object is a node of some specific (or one of several) types.
	* For example, this tests if the node is an ##<input />##, ##<select />##,
	* or ##<textarea />##.
	*
	* JX.DOM.isType(node, ['input', 'select', 'textarea']);
	*
	* @param wild Something which might be a Node.
	* @param string\|list One or more tags which you want to test for.
	* @return bool True if the object is a node, and it's a node of one
	* of the provided types.
	* @task test
	*/
	isType : function(node, of_type) {
	node = ('' + (node.nodeName \|\| '')).toUpperCase();
	of_type = JX.$AX(of_type);
	for (var ii = 0; ii < of_type.length; ++ii) {
	if (of_type[ii].toUpperCase() == node) {
	return true;
	}
	}
	return false;
	},


	/**
	* Listen for events occuring beneath a specific node in the DOM. This is
	* similar to @{JX.Stratcom.listen()}, but allows you to specify some node
	* which serves as a scope instead of the default scope (the whole document)
	* which you get if you install using @{JX.Stratcom.listen()} directly. For
	* example, to listen for clicks on nodes with the sigil 'menu-item' below
	* the root menu node:
	*
	* var the_menu = getReferenceToTheMenuNodeSomehow();
	* JX.DOM.listen(the_menu, 'click', 'menu-item', function(e) { ... });
	*
	* @task stratcom
	* @param Node The node to listen for events underneath.
	* @param string\|list One or more event types to listen for.
	* @param list? A path to listen on, or a list of paths.
	* @param function Callback to invoke when a matching event occurs.
	* @return object A reference to the installed listener. You can later
	* remove the listener by calling this object's remove()
	* method.
	*/
	listen : function(node, type, path, callback) {
	var auto_id = ['autoid:' + JX.DOM._getAutoID(node)];
	path = JX.$AX(path \|\| []);
	if (!path.length) {
	path = auto_id;
	} else {
	for (var ii = 0; ii < path.length; ii++) {
	path[ii] = auto_id.concat(JX.$AX(path[ii]));
	}
	}
	return JX.Stratcom.listen(type, path, callback);
	},


	/**
	* Invoke a custom event on a node. This method is a companion to
	* @{method:JX.DOM.listen} and parallels @{method:JX.Stratcom.invoke} in
	* the same way that method parallels @{method:JX.Stratcom.listen}.
	*
	* This method can not be used to invoke native events (like 'click').
	*
	* @param Node The node to invoke an event on.
	* @param string Custom event type.
	* @param dict Event data.
	* @return JX.Event The event object which was dispatched to listeners.
	* The main use of this is to test whether any
	* listeners prevented the event.
	*/
	invoke : function(node, type, data) {
	if (__DEV__) {
	if (type in JX.__allowedEvents) {
	throw new Error(
	'JX.DOM.invoke(..., "' + type + '", ...): ' +
	'you cannot invoke with the same type as a native event.');
	}
	}
	return JX.Stratcom.dispatch({
	target: node,
	type: type,
	customData: data
	});
	},


	uniqID : function(node) {
	if (!node.getAttribute('id')) {
	node.setAttribute('id', 'uniqid_'+(++JX.DOM._uniqid));
	}
	return node.getAttribute('id');
	},

	alterClass : function(node, className, add) {
	if (__DEV__) {
	if (add !== false && add !== true) {
	JX.$E(
	'JX.DOM.alterClass(...): ' +
	'expects the third parameter to be Boolean: ' +
	add + ' was provided');
	}
	}

	var has = ((' '+node.className+' ').indexOf(' '+className+' ') > -1);
	if (add && !has) {
	node.className += ' '+className;
	} else if (has && !add) {
	node.className = node.className.replace(
	new RegExp('(^\|\\s)' + className + '(?:\\s\|$)', 'g'), ' ');
	}
	},

	htmlize : function(str) {
	return (''+str)
	.replace(/&/g, '&')
	.replace(/"/g, '"')
	.replace(/</g, '<')
	.replace(/>/g, '>');
	},


	/**
	* Show one or more elements, by removing their "display" style. This
	* assumes you have hidden them with @{method:hide}, or explicitly set
	* the style to `display: none;`.
	*
	* @task convenience
	* @param ... One or more nodes to remove "display" styles from.
	* @return void
	*/
	show : function() {
	var ii;

	if (__DEV__) {
	for (ii = 0; ii < arguments.length; ++ii) {
	if (!arguments[ii]) {
	JX.$E(
	'JX.DOM.show(...): ' +
	'one or more arguments were null or empty.');
	}
	}
	}

	for (ii = 0; ii < arguments.length; ++ii) {
	arguments[ii].style.display = '';
	}
	},


	/**
	* Hide one or more elements, by setting `display: none;` on them. This is
	* a convenience method. See also @{method:show}.
	*
	* @task convenience
	* @param ... One or more nodes to set "display: none" on.
	* @return void
	*/
	hide : function() {
	var ii;

	if (__DEV__) {
	for (ii = 0; ii < arguments.length; ++ii) {
	if (!arguments[ii]) {
	JX.$E(
	'JX.DOM.hide(...): ' +
	'one or more arguments were null or empty.');
	}
	}
	}

	for (ii = 0; ii < arguments.length; ++ii) {
	arguments[ii].style.display = 'none';
	}
	},

	textMetrics : function(node, pseudoclass, x) {
	if (!this._metrics[pseudoclass]) {
	var n = JX.$N(
	'var',
	{className: pseudoclass});
	this._metrics[pseudoclass] = n;
	}
	var proxy = this._metrics[pseudoclass];
	document.body.appendChild(proxy);
	proxy.style.width = x ? (x+'px') : '';
	JX.DOM.setContent(
	proxy,
	JX.$H(JX.DOM.htmlize(node.value).replace(/\n/g, '<br />')));
	var metrics = JX.Vector.getDim(proxy);
	document.body.removeChild(proxy);
	return metrics;
	},


	/**
	* Search the document for DOM nodes by providing a root node to look
	* beneath, a tag name, and (optionally) a sigil. Nodes which match all
	* specified conditions are returned.
	*
	* @task query
	*
	* @param Node Root node to search beneath.
	* @param string Tag name, like 'a' or 'textarea'.
	* @param string Optionally, a sigil which nodes are required to have.
	*
	* @return list List of matching nodes, which may be empty.
	*/
	scry : function(root, tagname, sigil) {
	if (__DEV__) {
	if (!JX.DOM.isNode(root)) {
	JX.$E(
	'JX.DOM.scry(<yuck>, ...): '+
	'first argument must be a DOM node.');
	}
	}

	var nodes = root.getElementsByTagName(tagname);
	if (!sigil) {
	return JX.$A(nodes);
	}
	var result = [];
	for (var ii = 0; ii < nodes.length; ii++) {
	if (JX.Stratcom.hasSigil(nodes[ii], sigil)) {
	result.push(nodes[ii]);
	}
	}
	return result;
	},


	/**
	* Select a node uniquely identified by a root, tagname and sigil. This
	* is similar to JX.DOM.scry() but expects exactly one result.
	*
	* @task query
	*
	* @param Node Root node to search beneath.
	* @param string Tag name, like 'a' or 'textarea'.
	* @param string Optionally, sigil which selected node must have.
	*
	* @return Node Node uniquely identified by the criteria.
	*/
	find : function(root, tagname, sigil) {
	if (__DEV__) {
	if (!JX.DOM.isNode(root)) {
	JX.$E(
	'JX.DOM.find(<glop>, "'+tagname+'", "'+sigil+'"): '+
	'first argument must be a DOM node.');
	}
	}

	var result = JX.DOM.scry(root, tagname, sigil);

	if (__DEV__) {
	if (result.length > 1) {
	JX.$E(
	'JX.DOM.find(<node>, "'+tagname+'", "'+sigil+'"): '+
	'matched more than one node.');
	}
	}

	if (!result.length) {
	JX.$E(
	'JX.DOM.find(<node>, "' + tagname + '", "' + sigil + '"): ' +
	'matched no nodes.');
	}

	return result[0];
	},


	/**
	* Select a node uniquely identified by an anchor, tagname, and sigil. This
	* is similar to JX.DOM.find() but walks up the DOM tree instead of down
	* it.
	*
	* @param Node Node to look above.
	* @param string Tag name, like 'a' or 'textarea'.
	* @param string Optionally, sigil which selected node must have.
	* @return Node Matching node.
	*
	* @task query
	*/
	findAbove : function(anchor, tagname, sigil) {
	if (__DEV__) {
	if (!JX.DOM.isNode(anchor)) {
	JX.$E(
	'JX.DOM.findAbove(<glop>, "' + tagname + '", "' + sigil + '"): ' +
	'first argument must be a DOM node.');
	}
	}

	var result = anchor.parentNode;
	while (true) {
	if (!result) {
	break;
	}
	if (JX.DOM.isType(result, tagname)) {
	if (!sigil \|\| JX.Stratcom.hasSigil(result, sigil)) {
	break;
	}
	}
	result = result.parentNode;
	}

	if (!result) {
	JX.$E(
	'JX.DOM.findAbove(<node>, "' + tagname + '", "' + sigil + '"): ' +
	'no matching node.');
	}

	return result;
	},


	/**
	* Focus a node safely. This is just a convenience wrapper that allows you
	* to avoid IE's habit of throwing when nearly any focus operation is
	* invoked.
	*
	* @task convenience
	* @param Node Node to move cursor focus to, if possible.
	* @return void
	*/
	focus : function(node) {
	try { node.focus(); } catch (lol_ie) {}
	},


	/**
	* Scroll to the position of an element in the document.
	* @task view
	* @param Node Node to move document scroll position to, if possible.
	* @return void
	*/
	scrollTo : function(node) {
	window.scrollTo(0, JX.$V(node).y);
	},

	_getAutoID : function(node) {
	if (!node.getAttribute('data-autoid')) {
	node.setAttribute('data-autoid', 'autoid_'+(++JX.DOM._autoid));
	}
	return node.getAttribute('data-autoid');
	}
	}
	});

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