utilxmlhttp.js

SQLiteDBMS是SQLite数据库的管理服务器软件

var _XMLHttp=[];

function XMLHttp(callback) {
	this.callback=callback;
	this.callbackData=null;
	this.query='';
	this.content='';
	this.url='';
	this.userUrl='';
	this.async=true;
	this.data=null;

	this._debug=false;

	this.xmlHttpReq=(window.XMLHttpRequest)?new XMLHttpRequest():(window.ActiveXObject?new ActiveXObject('Microsoft.XMLHTTP'):null);

	this.setCallback =	function (callback) {this.callback=callback;};
	this.setCallbackData = function (data) {this.callbackData=data;};
	this.setData =		function (data) {this.data=data;};
	this.setQuery =		function (query) {this.query=query;};
	this.setUrl =		function (url) {this.url=url;};
	this.setUserUrl =	function (url) {this.userUrl=url;};
	this.setAsync =		function (async) {this.async=async;};

	this.setHeader =	function (label, value) {this.xmlHttpReq.setRequestHeader(label, value);};

	this.debug =		function () {open(this.requestURI())};

	this.requestURI =	function () {
		if (this.userUrl) return this.userUrl;
		return '/'+_dbName;
	};

	this.executed =		false;

	this.open =			function () {
		var _url=this.requestURI();
		if (this._debug) {
			parent.open(_url);
			return false;
		}else{
			this.xmlHttpReq.open('POST', _url, this.async);
			return true;
		}
	};

	this.resetContent =	function () {this.content='';};
	this.setContent =	function (content) {this.content+=content;};
	this.getContent =	function () {return this.content;};
	this.send =			function (content) {
		if (!content)
			content=this.content;
		if (content) {
			this.setHeader('Content-Type', 'application/x-www-form-urlencoded');
			this.setHeader('Content-Length', content.length);
			this.xmlHttpReq.send(content);
			this.executed=true;
		}else{
			this.setHeader('Content-Length', '0');
			this.xmlHttpReq.send(null);
			this.executed=true;
		}
	};
	this.registCallback =	function (callback) {
		if (callback) {
			var argument=this.callbackData;
			this.xmlHttpReq.onreadystatechange=function() {callback(argument);};
		}else this.xmlHttpReq.onreadystatechange=function() {};
	};

	this.execute =		function (content) {
		if (this.xmlHttpReq) {
			if (this.xmlHttpReq.readyState > 0 || this.executed) this.abort();
			this.registCallback(this.callback);
			if (this.open()) {
				this.send(content);
				if (!this.async && this.callback) this.callback(this);
			}
		}else
			alert('Cannot execute.');
	};

	this.success =		function () {
		if (!this.async) return this.xmlHttpReq;
		return (this.xmlHttpReq && this.xmlHttpReq.readyState == 4 && (this.xmlHttpReq.status == 200 || this.xmlHttpReq.status == 202));
	};
	this.working =		function () {
		if (this.xmlHttpReq) return this.xmlHttpReq.readyState;
		else return 0;
	};
	this.status =		function () {
		return this.xmlHttpReq.status;
	};
	this.getTree =		function () {
		if (!this.xmlHttpReq || !this.xmlHttpReq.responseXML || !this.xmlHttpReq.responseXML.documentElement) return null;
		var tree={};
		var root=this.xmlHttpReq.responseXML.documentElement;
		for (var node=root.firstChild; node; node=node.nextSibling) {
			var data=this._getTree(node);
			if (tree[node.nodeName])
				tree[node.nodeName].push(data);
			else
				tree[node.nodeName]=[data];
		}
		return tree;
	};
	this._getTree =		function (node) {
		if (!node) return false;
		var ret=new Object;
		var data;
		for (var i=0; i < node.childNodes.length; i++) {
			if (node.childNodes[i].hasChildNodes() && node.childNodes[i].firstChild.hasChildNodes())
				data=this._getTree(node.childNodes[i]);
			else
				data=(_isIE?node.childNodes[i].text:node.childNodes[i].textContent);

			var name=node.childNodes[i].nodeName;//.toLowerCase();
			if (name == '#text') {
				ret=data;
			}else{
				if (ret[name])
					ret[name].push(data);
				else
					ret[name]=[data];
			}
		}
		return ret;
	};
	this.doc =			function (rootNodeName) {
		if (!rootNodeName) rootNodeName='RESPONSE';
		if (!this.xmlHttpReq || !this.xmlHttpReq.responseXML || !this.xmlHttpReq.responseXML.documentElement) return null;
		return (this.xmlHttpReq.responseXML.documentElement.nodeName == rootNodeName)?this.xmlHttpReq.responseXML.documentElement:null;
	};
	this.getResponse =	function (nodeName) {
		var ret=[];
		if (this.success()) {
			var root=this.doc();
			if (root && root.nodeName == 'RESPONSE' && root.firstChild.nodeName == nodeName) {
				for (var node=root.firstChild; node && node.nodeName == nodeName && node.hasChildNodes(); node=node.nextSibling) {
					var data=this.getRow(node);
					ret.push(data);
				}
				return ret;
			}else return false;
		}else return false;
	};
	this.getError =		function (type) {
		if (this.success()) {
			var root=this.doc();
			if (root && root.nodeName == 'RESPONSE' && root.firstChild.nodeName == 'ERROR') {
				for (var node=root.firstChild; node && node.nodeName == 'ERROR' && node.hasChildNodes(); node=node.nextSibling) {
					var data=this.getRow(node);
					if (type == 'code') return data.errorcode;
					else if (type == 'msg') return data.errormsg;
					else return data;
				}
				return false;
			}else return false;
		}else return false;
	};
	this.getRow =		function (node) {
		if (!node) return false;
		var ret=new Object;
		for (var i=node.childNodes.length; i--;) {
			if (node.childNodes[i].hasChildNodes() && node.childNodes[i].firstChild.hasChildNodes())
				ret[node.childNodes[i].nodeName/*.toLowerCase()*/]=this.getRow(node.childNodes[i]);
			else
				ret[node.childNodes[i].nodeName/*.toLowerCase()*/]=(_isIE?node.childNodes[i].text:node.childNodes[i].textContent);
		}
		return ret;
	};
	this.xml =			function () {
		if (this.success() && this.xmlHttpReq && this.xmlHttpReq.responseXML)
			return this.xmlHttpReq.responseXML.xml;
		else return '';
	};
	this.headers =		function () {
		return this.xmlHttpReq.getAllResponseHeaders();
	};
	this.text =			function () {
		if (this.success() && this.xmlHttpReq && this.xmlHttpReq.responseText)
			return this.xmlHttpReq.responseText;
		else return '';
	};

	this.abort =		function () {if (this.xmlHttpReq) {this.xmlHttpReq.abort();this.executed=false;}};
}