///////////////////////////////////////////////////////////////////////////////////////////
//               主要实现iframe模拟xmlhttprequest，实现无刷新提交
///////////////////////////////////////////////////////////////////////////////////////////


var currentRequest = null;

/**
*页面onload时绑定隐藏iframe
*返回值：无
*/
function initAjaxRequestBox(){
	var div = null;
	div = document.createElement("div");
	div.id = "myAjaxResultBox";
	div.innerHTML = "<iframe name='myAjaxResultFrame' init=false style='display:none;' onload='myAjaxResultFrame_onResult();'></iframe>";
	document.body.appendChild(div);
}

if(window.document.all){
	window.attachEvent("onload" ,
		function(e){
			initAjaxRequestBox()
		}
	);
}else{
	window.addEventListener("load",
		function(e){
			initAjaxRequestBox()
		},
		false
	);
}
/**
*提交请求后，结果返回事件触发
*返回值：无
*/
function myAjaxResultFrame_onResult(){
	var myFrame = document.getElementsByName('myAjaxResultFrame')[0];

	if(myFrame.inited==true){
		if(myFrame.contentWindow.document.getElementById("XMLHttpResultDiv")){
			var text = myFrame.contentWindow.document.getElementById("XMLHttpResultDiv").innerHTML;
		}else{
			var text = myFrame.contentWindow.document.body.innerHTML;
		}
		currentRequest.setText(text);
		currentRequest.onresult();
	}else{
		myFrame.inited = true;
	}
}
/**
*AjaxRequest对象
*_method: 值post/get    和form使用方法一致
*_url:    值string      和form的action一致
*_async:  值false/true同步/异步  由于是iframe提交，没有异步
*/
function AjaxRequest(_method,_url,_async){
	var oThis = this;
	var value = null;
	var text = null;
	
	var _form = document.getElementById("myAjaxRequestForm");
	if(_form){
		_form.removeNode(true);
	}
	
	_form = document.createElement("form");
	document.body.appendChild(_form);
	
	_form.method = _method;
	_form.action = _url;
	_form.target = "myAjaxResultFrame";
	
	currentRequest = oThis;
	//input参数传递
	this.setParameter = function(name,value) {
		var _input = document.createElement("input");
		_input.name=name;
		_input.value=value;
		_input.type="hidden";
		_form.appendChild(_input);
	}

	//url参数传递
	this.send = function(v){
		if(v==null || v==""){
			_form.submit();

		}else{
			var parts = v.split('&');
			for(var i=0;i<parts.length;i++){
				var part = parts[i].split('=');
				var name = part[0];
				var value = part[1];
				var _input = document.createElement("input");
				_input.name=name;
				_input.value=value;
				_input.type="hidden";
				_form.appendChild(_input);
			}
			_form.submit();
		}
	}
	//提取返回字段
	this.getText = function(){
		return text;
	}
	
	this.setText = function(t){
		text = t;
	}
	//ajax请求完成
	this.onresult = function(){
		
	}
}