rs.htm

此程序为网上下载

		else
		{
			errmsg = 'ERROR:\nCannot locate proxy which supports Remote Scripting.\nWas RSEnableRemoteScripting method invoked?';
			request.status = MSRS_FAIL;
			request.message = errmsg; 
			alert(errmsg);
		}
	}
	if (request.status != MSRS_FAIL)
	{
		url = this.buildURL(url,method,args);
		url_context = window.location.href; // May not be 'window.location.pathname'
		this.rsapplet.startRequest(request.id,url_context,url,this.REQUEST_MODE_COMPLETE);
		if (typeof(cb)== 'function')
		{
			if (this.pollCount++ == 0)
				this.setRequestPoll();
		}
		else
		{	// wait synchronously for response
			request.wait();
		}
	}
	//return aRecs+"/"+request+"/";
	return request;
}

//*****************************************************************
// function _MSRS_invokeMethod(url,method,args)
//	This is the function by which remote scripting calls are 
//	via a server object retrieved with the GetASPObject call.
//	The caller provides the following :
//		url		: url to the asp 
//		method	: name of the method to be invoked
//		args	: an array containing method parameters
//				  and the optional cb, ecb, context parameters
//*****************************************************************
function _MSRS_invokeMethod(url,method,args)
{
	var cb, ecb, context;
	var params = new Array;
	var pn = 0;
	var i = 0;
	for (var i=0; i < args.length; i++)
	{
		if (typeof(args[i]) == 'function')
		{
			pn = -1;	// no more params
			if (typeof(cb) == 'undefined')
				cb = args[i];
			else
				ecb = args[i];
		}
		else if (pn != -1)
		{
			params[pn++] = args[i];
		}
		else
			context = args[i];
	}

	return MSRS.startRequest(url,method,params,cb,ecb,context);
}

//*****************************************************************
// function _MSRS_handleResponse(requestid)
//
//	This function will handle the response for a given request.
//	If the response is complete or failed, then the associated
//	request object will be updated and the appropriate callback
//	invoked, if provided.
//	NOTE: incremental data retrieval is not yet supported
//*****************************************************************
function _MSRS_handleResponse(requestid)
{
	var request = this.requestList[requestid];
    if (typeof(request) == 'undefined')
	{
        alert('Unknown request id.');
		return;
	}
	
    request.status = this.rsapplet.getStatus();
    
    if (request.status == MSRS_COMPLETED)
	{
		request.data = this.rsapplet.getData();
		request.message = this.rsapplet.getMessage();
		this.evaluateRequest(request);
		if (request.status == MSRS_FAIL)
		{	
			if (typeof(request.error_callback) == 'function')
			{
				this.pollCount--;
				request.error_callback(request);
			}
			else
				alert('Remote Scripting Error\n' + request.message);
		}
		else
		{
			if (typeof(request.callback) == 'function')
			{
				this.pollCount--;
				request.callback(request);
			}
		}
		this.rsapplet.endResponse();
		this.requestList[request.id] = null;
	}
    else if (request.status == MSRS_FAIL)
	{
		request.message = this.rsapplet.getMessage();
		if (typeof(request.error_callback) == 'function')
		{
			this.pollCount--;
			request.error_callback(request);
		}
		this.rsapplet.endResponse();
		this.requestList[request.id] = null;
	}
    else if (request.status == MSRS_PARTIAL)
	{	// not handling partial data retrieval yet
	}
    else if (request.status == MSRS_PENDING)
	{	// do nothing
	}
}

//*****************************************************************
// function _MSRS_evaluateRequest(request)
//
//	This function evaluates the data returned to the request. 
//	Marshalled jscript objects are re-evaluated on the client.
//*****************************************************************
function _MSRS_evaluateRequest(request)
{
	var data = request.data;
	var start_index = 0;
	var end_index = 0;
	var start_key = '<' + 'RETURN_VALUE';
	var end_key = '<' + '/RETURN_VALUE>';

	if ((start_index = data.indexOf(start_key)) != -1)
	{
		var data_start_index = data.indexOf('>',start_index) + 1;
		end_index = data.indexOf(end_key,data_start_index);
		if (end_index == -1) 
			end_index = data.length;
		var metatag = data.substring(start_index,data_start_index);
		if (metatag.indexOf('TYPE=SIMPLE') != -1)
		{
			request.return_value = unescape(data.substring(data_start_index,end_index));
		}
		else if (metatag.indexOf('TYPE=EVAL_OBJECT') != -1)
		{
			request.return_value = data.substring(data_start_index,end_index);
			request.return_value = eval(unescape(request.return_value));
		}
		else if (metatag.indexOf('TYPE=ERROR') != -1)
		{
			request.status = MSRS_FAIL;
			request.message = unescape(data.substring(data_start_index,end_index));		
		}
	}
	else
	{
		request.status = MSRS_FAIL;
		request.message = 'REMOTE SCRIPTING ERROR: Page invoked does not support remote scripting.';			
	}
}

//*****************************************************************
// function _MSRS_setRequestPoll()
//
//	Due to limitations in calling back into JScript from a worker
//	thread of an applet, a polling mechanism is used to determine
//	when a request has been completed. This function sets up
//	a timer to kick the requestPollHandler at a later time.
//*****************************************************************
function _MSRS_setRequestPoll()
{
	this.pollID = window.setTimeout('MSRS.requestPollHandler()',this.POLLING_PERIOD,'javascript');
}

//*****************************************************************
// function _MSRS_requestPollHandler()
//
//	Due to limitations in calling back into JScript from a worker
//	thread of an applet, a polling mechanism is used to determine
//	when a request has been completed. This function is the 
//	handler which is kicked by a timer. It polls the applet to
//	see if a response to a prior request is available.
//*****************************************************************
function _MSRS_requestPollHandler()
{
    while (this.rsapplet.hasResponse())
    {
		this.handleResponse(this.rsapplet.getRequestID());
	}
    if (this.pollCount != 0)
        this.setRequestPoll();
}

//*****************************************************************
// function _MSRS_escapePlus(value)
//
//	This replaces all occurances of '+' with ''%2B' in the supplied
//  string.
//*****************************************************************
function _MSRS__escapePlus(value)
{
	for (var i = 0, newValue = ''; i < value.length; i++)
		newValue += (value.charAt(i) == '+' ? '%2B' : value.charAt(i));
	return newValue;
}

//*****************************************************************
// function _MSRS_buildURL(url,method,args)
//
//	This builds the proper url entry point into the ASP page
//	such that the intended server method with parameters gets
//	invoked.
//*****************************************************************
function _MSRS_buildURL(url,method,args)
{
	if (url == '') url = window.location.pathname;
	if (typeof(method) == 'string')
	{
		url += '?_method=' + method;
		url += '&_mtype=execute';
		var params = '&pcount=0';
		if (typeof(args) != 'undefined' && args.length)
		{	// add parameters
			params = '&pcount=' + args.length 
			for (var i = 0; i < args.length; i++) 
			{
				var arg = args[i];
				params += '&p' + i + '=' + _MSRS__escapePlus(escape(arg));
			}
		}
		url += params;
	}
	return url;
}