dom-attr.js

define(["exports", "./sniff", "./_base/lang", "./dom", "./dom-style", "./dom-prop"],
		function(exports, has, lang, dom, style, prop){
	// module:
	//		dojo/dom-attr
	// summary:
	//		This module defines the core dojo DOM attributes API.

	// TODOC: summary not showing up in output see https://github.com/csnover/js-doc-parse/issues/42

	// =============================
	// Element attribute Functions
	// =============================

	// This module will be obsolete soon. Use dojo/prop instead.

	// dojo/dom-attr.get() should conform to http://www.w3.org/TR/DOM-Level-2-Core/

	// attribute-related functions (to be obsolete soon)
	var forcePropNames = {
			innerHTML:	1,
			textContent:1,
			className:	1,
			htmlFor:	has("ie"),
			value:		1
		},
		attrNames = {
			// original attribute names
			classname: "class",
			htmlfor: "for",
			// for IE
			tabindex: "tabIndex",
			readonly: "readOnly"
		};

	function _hasAttr(node, name){
		var attr = node.getAttributeNode && node.getAttributeNode(name);
		return attr && attr.specified; // Boolean
	}
	
	// There is a difference in the presence of certain properties and their default values
	// between browsers. For example, on IE "disabled" is present on all elements,
	// but it is value is "false"; "tabIndex" of <div> returns 0 by default on IE, yet other browsers
	// can return -1.

	exports.has = function hasAttr(/*DOMNode|String*/ node, /*String*/ name){
		// summary:
		//		Returns true if the requested attribute is specified on the
		//		given element, and false otherwise.
		// node: DOMNode|String
		//		id or reference to the element to check
		// name: String
		//		the name of the attribute
		// returns: Boolean
		//		true if the requested attribute is specified on the
		//		given element, and false otherwise

		var lc = name.toLowerCase();
		return forcePropNames[prop.names[lc] || name] || _hasAttr(dom.byId(node), attrNames[lc] || name);	// Boolean
	};

	exports.get = function getAttr(/*DOMNode|String*/ node, /*String*/ name){
		// summary:
		//		Gets an attribute on an HTML element.
		// description:
		//		Handles normalized getting of attributes on DOM Nodes.
		// node: DOMNode|String
		//		id or reference to the element to get the attribute on
		// name: String
		//		the name of the attribute to get.
		// returns:
		//		the value of the requested attribute or null if that attribute does not have a specified or
		//		default value;
		//
		// example:
		//	|	// get the current value of the "foo" attribute on a node
		//	|	require(["dojo/dom-attr", "dojo/dom"], function(domAttr, dom){
		//	|		domAttr.get(dom.byId("nodeId"), "foo");
		//	|		// or we can just pass the id:
		//	|		domAttr.get("nodeId", "foo");
		//	|	});	
		//	|	

		node = dom.byId(node);
		var lc = name.toLowerCase(),
			propName = prop.names[lc] || name,
			forceProp = forcePropNames[propName],
			value = node[propName];		// should we access this attribute via a property or via getAttribute()?

		if(forceProp && typeof value != "undefined"){
			// node's property
			return value;	// Anything
		}
		
		if(propName == "textContent"){
			return prop.get(node, propName);
		}
		
		if(propName != "href" && (typeof value == "boolean" || lang.isFunction(value))){
			// node's property
			return value;	// Anything
		}
		// node's attribute
		// we need _hasAttr() here to guard against IE returning a default value
		var attrName = attrNames[lc] || name;
		return _hasAttr(node, attrName) ? node.getAttribute(attrName) : null; // Anything
	};

	exports.set = function setAttr(/*DOMNode|String*/ node, /*String|Object*/ name, /*String?*/ value){
		// summary:
		//		Sets an attribute on an HTML element.
		// description:
		//		Handles normalized setting of attributes on DOM Nodes.
		//
		//		When passing functions as values, note that they will not be
		//		directly assigned to slots on the node, but rather the default
		//		behavior will be removed and the new behavior will be added
		//		using `dojo.connect()`, meaning that event handler properties
		//		will be normalized and that some caveats with regards to
		//		non-standard behaviors for onsubmit apply. Namely that you
		//		should cancel form submission using `dojo.stopEvent()` on the
		//		passed event object instead of returning a boolean value from
		//		the handler itself.
		// node: DOMNode|String
		//		id or reference to the element to set the attribute on
		// name: String|Object
		//		the name of the attribute to set, or a hash of key-value pairs to set.
		// value: String?
		//		the value to set for the attribute, if the name is a string.
		// returns:
		//		the DOM node
		//
		// example:
		//	|	// use attr() to set the tab index
		//	|	require(["dojo/dom-attr"], function(domAttr){
		//	|		domAttr.set("nodeId", "tabIndex", 3);
		//	|	});
		//
		// example:
		//	Set multiple values at once, including event handlers:
		//	|	require(["dojo/dom-attr"],
		//	|	function(domAttr){
		//	|		domAttr.set("formId", {
		//	|			"foo": "bar",
		//	|			"tabIndex": -1,
		//	|			"method": "POST"
		//	|		}
		//	|	});

		node = dom.byId(node);
		if(arguments.length == 2){ // inline'd type check
			// the object form of setter: the 2nd argument is a dictionary
			for(var x in name){
				exports.set(node, x, name[x]);
			}
			return node; // DomNode
		}
		var lc = name.toLowerCase(),
			propName = prop.names[lc] || name,
			forceProp = forcePropNames[propName];
		if(propName == "style" && typeof value != "string"){ // inline'd type check
			// special case: setting a style
			style.set(node, value);
			return node; // DomNode
		}
		if(forceProp || typeof value == "boolean" || lang.isFunction(value)){
			return prop.set(node, name, value);
		}
		// node's attribute
		node.setAttribute(attrNames[lc] || name, value);
		return node; // DomNode
	};

	exports.remove = function removeAttr(/*DOMNode|String*/ node, /*String*/ name){
		// summary:
		//		Removes an attribute from an HTML element.
		// node: DOMNode|String
		//		id or reference to the element to remove the attribute from
		// name: String
		//		the name of the attribute to remove

		dom.byId(node).removeAttribute(attrNames[name.toLowerCase()] || name);
	};

	exports.getNodeProp = function getNodeProp(/*DomNode|String*/ node, /*String*/ name){
		// summary:
		//		Returns an effective value of a property or an attribute.
		// node: DOMNode|String
		//		id or reference to the element to remove the attribute from
		// name: String
		//		the name of the attribute
		// returns:
		//		the value of the attribute

		node = dom.byId(node);
		var lc = name.toLowerCase(), propName = prop.names[lc] || name;
		if((propName in node) && propName != "href"){
			// node's property
			return node[propName];	// Anything
		}
		// node's attribute
		var attrName = attrNames[lc] || name;
		return _hasAttr(node, attrName) ? node.getAttribute(attrName) : null; // Anything
	};
});