1.builder.js

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// Copyright (c) 2005 Thomas Fuchs (http://script.aculo.us, http://mir.aculo.us)
//
// See scriptaculous.js for full license.

var Builder = {
	NODEMAP: {
		AREA: 'map',
		CAPTION: 'table',
		COL: 'table',
		COLGROUP: 'table',
		LEGEND: 'fieldset',
		OPTGROUP: 'select',
		OPTION: 'select',
		PARAM: 'object',
		TBODY: 'table',
		TD: 'table',
		TFOOT: 'table',
		TH: 'table',
		THEAD: 'table',
		TR: 'table'
	},
	// note: For Firefox < 1.5, OPTION and OPTGROUP tags are currently broken,
	//       due to a Firefox bug
	node: function(elementName) {
		elementName = elementName.toUpperCase();

		// try innerHTML approach
		var parentTag = this.NODEMAP[elementName] || 'div';
		var parentElement = document.createElement(parentTag);
		parentElement.style.display = 'none';
		if (elementName != 'SCRIPT') {
			document.body.appendChild(parentElement);
		}
		try { // prevent IE "feature": http://dev.rubyonrails.org/ticket/2707
			parentElement.innerHTML = "<" + elementName + "></" + elementName + ">";
		} catch(e) {}
		var element = parentElement.firstChild || null;

		// see if browser added wrapping tags
		if(element && (element.tagName != elementName))
		element = element.getElementsByTagName(elementName)[0];

		// fallback to createElement approach
		if(!element) element = document.createElement(elementName);

		// abort if nothing could be created
		if(!element) return;

		// attributes (or text)
		if(arguments[1]) {
			if(this._isStringOrNumber(arguments[1]) || (arguments[1] instanceof Array)) {
				this._children(element, arguments[1]);
			} else {
				var attrs = this._attributes(arguments[1]);
				if(attrs.length) {
					try { // prevent IE "feature": http://dev.rubyonrails.org/ticket/2707
						parentElement.innerHTML = "<" +elementName + " " +
						attrs + "></" + elementName + ">";
					} catch(e) {}
					element = parentElement.firstChild || null;
					// workaround firefox 1.0.X bug
					if(!element) {
						element = document.createElement(elementName);
						for(attr in arguments[1]) 
							element[attr == 'class' ? 'className' : attr] = arguments[1][attr];
					}
					if(element.tagName != elementName)
						element = parentElement.getElementsByTagName(elementName)[0];
				}
			}
		}

		// text, or array of children
		if(arguments[2])
			this._children(element, arguments[2]);
		if (elementName != 'SCRIPT') {
			document.body.removeChild(parentElement);
		}
		return element;
	},
	_text: function(text) {
		return document.createTextNode(text);
	},
	_attributes: function(attributes) {
		var attrs = [];
		for(attribute in attributes)
			attrs.push((attribute=='className' ? 'class' : attribute) + '="' + attributes[attribute].toString().escapeHTML() + '"');
		return attrs.join(" ");
	},
	_children: function(element, children) {
		if(typeof children=='object') { // array can hold nodes and text
			children.flatten().each( function(e) {
				if(typeof e=='object')
				element.appendChild(e)
				else
				if(Builder._isStringOrNumber(e))
				element.appendChild(Builder._text(e));
			});
		} else
			if(Builder._isStringOrNumber(children)) 
				element.appendChild(Builder._text(children));
	},
	_isStringOrNumber: function(param) {
		return(typeof param=='string' || typeof param=='number');
	}
}