html.js

dojo与json创建无限级树的时候,当在父结点下添加了一个新结点,我怎么让父亲结点重新调用json加载一下子结点内容.

/*
	Copyright (c) 2004-2006, The Dojo Foundation
	All Rights Reserved.

	Licensed under the Academic Free License version 2.1 or above OR the
	modified BSD license. For more information on Dojo licensing, see:

		http://dojotoolkit.org/community/licensing.shtml
*/

dojo.provide("dojo.html");

dojo.require("dojo.lang.func");
dojo.require("dojo.dom");
dojo.require("dojo.style");
dojo.require("dojo.string");

dojo.lang.mixin(dojo.html, dojo.dom);
dojo.lang.mixin(dojo.html, dojo.style);

// FIXME: we are going to assume that we can throw any and every rendering
// engine into the IE 5.x box model. In Mozilla, we do this w/ CSS.
// Need to investigate for KHTML and Opera

dojo.html.clearSelection = function(){
	try{
		if(window["getSelection"]){ 
			if(dojo.render.html.safari){
				// pulled from WebCore/ecma/kjs_window.cpp, line 2536
				window.getSelection().collapse();
			}else{
				window.getSelection().removeAllRanges();
			}
		}else if(document.selection){
			if(document.selection.empty){
				document.selection.empty();
			}else if(document.selection.clear){
				document.selection.clear();
			}
		}
		return true;
	}catch(e){
		dojo.debug(e);
		return false;
	}
}

dojo.html.disableSelection = function(element){
	element = dojo.byId(element)||document.body;
	var h = dojo.render.html;
	
	if(h.mozilla){
		element.style.MozUserSelect = "none";
	}else if(h.safari){
		element.style.KhtmlUserSelect = "none"; 
	}else if(h.ie){
		element.unselectable = "on";
	}else{
		return false;
	}
	return true;
}

dojo.html.enableSelection = function(element){
	element = dojo.byId(element)||document.body;
	
	var h = dojo.render.html;
	if(h.mozilla){ 
		element.style.MozUserSelect = ""; 
	}else if(h.safari){
		element.style.KhtmlUserSelect = "";
	}else if(h.ie){
		element.unselectable = "off";
	}else{
		return false;
	}
	return true;
}

dojo.html.selectElement = function(element){
	element = dojo.byId(element);
	if(document.selection && document.body.createTextRange){ // IE
		var range = document.body.createTextRange();
		range.moveToElementText(element);
		range.select();
	}else if(window["getSelection"]){
		var selection = window.getSelection();
		// FIXME: does this work on Safari?
		if(selection["selectAllChildren"]){ // Mozilla
			selection.selectAllChildren(element);
		}
	}
}

dojo.html.selectInputText = function(element){
	element = dojo.byId(element);
	if(document.selection && document.body.createTextRange){ // IE
		var range = element.createTextRange();
		range.moveStart("character", 0);
		range.moveEnd("character", element.value.length);
		range.select();
	}else if(window["getSelection"]){
		var selection = window.getSelection();
		// FIXME: does this work on Safari?
		element.setSelectionRange(0, element.value.length);
	}
	element.focus();
}


dojo.html.isSelectionCollapsed = function(){
	if(document["selection"]){ // IE
		return document.selection.createRange().text == "";
	}else if(window["getSelection"]){
		var selection = window.getSelection();
		if(dojo.lang.isString(selection)){ // Safari
			return selection == "";
		}else{ // Mozilla/W3
			return selection.isCollapsed;
		}
	}
}

dojo.html.getEventTarget = function(evt){
	if(!evt) { evt = window.event || {} };
	var t = (evt.srcElement ? evt.srcElement : (evt.target ? evt.target : null));
	while((t)&&(t.nodeType!=1)){ t = t.parentNode; }
	return t;
}

dojo.html.getDocumentWidth = function(){
	dojo.deprecated("dojo.html.getDocument*", "replaced by dojo.html.getViewport*", "0.4");
	return dojo.html.getViewportWidth();
}

dojo.html.getDocumentHeight = function(){
	dojo.deprecated("dojo.html.getDocument*", "replaced by dojo.html.getViewport*", "0.4");
	return dojo.html.getViewportHeight();
}

dojo.html.getDocumentSize = function(){
	dojo.deprecated("dojo.html.getDocument*", "replaced of dojo.html.getViewport*", "0.4");
	return dojo.html.getViewportSize();
}

dojo.html.getViewportWidth = function(){
	var w = 0;

	if(window.innerWidth){
		w = window.innerWidth;
	}

	if(dojo.exists(document, "documentElement.clientWidth")){
		// IE6 Strict
		var w2 = document.documentElement.clientWidth;
		// this lets us account for scrollbars
		if(!w || w2 && w2 < w) {
			w = w2;
		}
		return w;
	}

	if(document.body){
		// IE
		return document.body.clientWidth;
	}

	return 0;
}

dojo.html.getViewportHeight = function(){
	if (window.innerHeight){
		return window.innerHeight;
	}

	if (dojo.exists(document, "documentElement.clientHeight")){
		// IE6 Strict
		return document.documentElement.clientHeight;
	}

	if (document.body){
		// IE
		return document.body.clientHeight;
	}

	return 0;
}

dojo.html.getViewportSize = function(){
	var ret = [dojo.html.getViewportWidth(), dojo.html.getViewportHeight()];
	ret.w = ret[0];
	ret.h = ret[1];
	return ret;
}

dojo.html.getScrollTop = function(){
	return window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop || 0;
}

dojo.html.getScrollLeft = function(){
	return window.pageXOffset || document.documentElement.scrollLeft || document.body.scrollLeft || 0;
}

dojo.html.getScrollOffset = function(){
	var off = [dojo.html.getScrollLeft(), dojo.html.getScrollTop()];
	off.x = off[0];
	off.y = off[1];
	return off;
}

dojo.html.getParentOfType = function(node, type){
	dojo.deprecated("dojo.html.getParentOfType", "replaced by dojo.html.getParentByType*", "0.4");
	return dojo.html.getParentByType(node, type);
}

dojo.html.getParentByType = function(node, type) {
	var parent = dojo.byId(node);
	type = type.toLowerCase();
	while((parent)&&(parent.nodeName.toLowerCase()!=type)){
		if(parent==(document["body"]||document["documentElement"])){
			return null;
		}
		parent = parent.parentNode;
	}
	return parent;
}

// RAR: this function comes from nwidgets and is more-or-less unmodified.
// We should probably look ant Burst and f(m)'s equivalents
dojo.html.getAttribute = function(node, attr){
	node = dojo.byId(node);
	// FIXME: need to add support for attr-specific accessors
	if((!node)||(!node.getAttribute)){
		// if(attr !== 'nwType'){
		//	alert("getAttr of '" + attr + "' with bad node"); 
		// }
		return null;
	}
	var ta = typeof attr == 'string' ? attr : new String(attr);

	// first try the approach most likely to succeed
	var v = node.getAttribute(ta.toUpperCase());
	if((v)&&(typeof v == 'string')&&(v!="")){ return v; }

	// try returning the attributes value, if we couldn't get it as a string
	if(v && v.value){ return v.value; }

	// this should work on Opera 7, but it's a little on the crashy side
	if((node.getAttributeNode)&&(node.getAttributeNode(ta))){
		return (node.getAttributeNode(ta)).value;
	}else if(node.getAttribute(ta)){
		return node.getAttribute(ta);
	}else if(node.getAttribute(ta.toLowerCase())){
		return node.getAttribute(ta.toLowerCase());
	}
	return null;
}
	
/**
 *	Determines whether or not the specified node carries a value for the
 *	attribute in question.
 */
dojo.html.hasAttribute = function(node, attr){
	node = dojo.byId(node);
	return dojo.html.getAttribute(node, attr) ? true : false;
}
	
/**
 * Returns the string value of the list of CSS classes currently assigned
 * directly to the node in question. Returns an empty string if no class attribute
 * is found;
 */
dojo.html.getClass = function(node){
	node = dojo.byId(node);
	if(!node){ return ""; }
	var cs = "";
	if(node.className){
		cs = node.className;
	}else if(dojo.html.hasAttribute(node, "class")){
		cs = dojo.html.getAttribute(node, "class");
	}
	return dojo.string.trim(cs);
}

/**
 * Returns an array of CSS classes currently assigned
 * directly to the node in question. Returns an empty array if no classes
 * are found;
 */
dojo.html.getClasses = function(node) {
	var c = dojo.html.getClass(node);
	return (c == "") ? [] : c.split(/\s+/g);
}

/**
 * Returns whether or not the specified classname is a portion of the
 * class list currently applied to the node. Does not cover cascaded
 * styles, only classes directly applied to the node.