alert.js

来自「Java的框架」· JavaScript 代码 · 共 105 行

var alertPollURI = '/alert.srv';
var alertPushURI = '/alert_push.srv';
var alertAjaxURI = '/alert_ajax.srv';

var alertURI = null;

var alertLayer = '<iframe id="alertFrame" name="alertFrame" src="" style="visibility: hidden; width: 0px; height: 0px; border: 0px;"></iframe>';
var timer = null;
var alertWebRoot = null;
var isLoaded = false;
var alertType = null;

function startAlertListener (webRoot, alertRequestType) {
	self.document.write(alertLayer);
	
	alertType = alertRequestType;
	alertWebRoot = webRoot;
	
	if (alertRequestType == "poll") {
		alertURI = webRoot + alertPollURI;
		reloadFrame ();
	}
	else if (alertRequestType == 'push') {
		alertURI = webRoot + alertPushURI;
		timer = window.window.setTimeout('testDocumentLoaded()', 100);
	}
	else if (alertRequestType == 'ajax') {
		alertURI = webRoot + alertAjaxURI;
		makeAjaxRequest ();	
	}
}

function testDocumentLoaded () {
	if (isLoaded) {
		reloadFrame ();	
	}
	else {
		timer = window.window.setTimeout('testDocumentLoaded()', 100);
	}
}



function startPollTimer () {
	timer = window.window.setTimeout('reloadFrame()', 2000);
}

function stopPollTimer () {
	if (timer != null) {
		window.clearTimeout (timer);
		timer = null;
	}
}


function reloadFrame () {
	stopPollTimer ();
	self.alertFrame.location.replace (alertURI);
}

function hasAlert () {
	stopPollTimer ();
	elm = window.document.getElementById ('alertImage');
	elm.style.visibility = 'visible';
}

function showAlertReturnFunc () {
	elm = window.document.getElementById ('alertImage');
	elm.style.visibility = 'hidden';	
	
	if (alertType == "poll") {
	reloadFrame ();
	}
	else if (alertType == 'push') {
		reloadFrame ();
	}
	else if (alertType == 'ajax') {
		makeAjaxRequest ();	
	}
}

function  showAlert () {
	showPopWin(alertWebRoot + '/alert/viewAlert.action', 400, 300, showAlertReturnFunc);
}

function makeAjaxRequest () {
	stopPollTimer ();
	new net.ContentLoader (alertURI, handleAjaxResponse, null, "POST");
}


function handleAjaxResponse () {
	var response = this.req.responseText;
	
	if (response.length >= 3) {
		hasAlert ();
	}
	else {
		startAjaxTimer ();
	}
}

function startAjaxTimer () {
	timer = window.window.setTimeout('makeAjaxRequest()', 2000);
}