mirror of
https://github.com/ADElectronics/RTL00_WEB_VS.git
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95 lines
3.1 KiB
JavaScript
95 lines
3.1 KiB
JavaScript
/* Java for WEB device */
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var ajaxList = new Array(); // Stores a queue of AJAX events to process
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var nextimeout = 500;
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function newAJAXCommand(url, container, repeat, data) {
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// Set up our object
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var newAjax = new Object();
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var theTimer = new Date();
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newAjax.url = url;
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newAjax.container = container;
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newAjax.repeat = repeat;
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newAjax.ajaxReq = null;
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// Create and send the request
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if (window.XMLHttpRequest) {
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newAjax.ajaxReq = new XMLHttpRequest();
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newAjax.ajaxReq.open((data == null) ? "GET" : "POST", newAjax.url, true);
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newAjax.ajaxReq.send(data);
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// If we're using IE6 style (maybe 5.5 compatible too)
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} else if (window.ActiveXObject) {
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newAjax.ajaxReq = new ActiveXObject("Microsoft.XMLHTTP");
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if (newAjax.ajaxReq) {
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newAjax.ajaxReq.open((data == null) ? "GET" : "POST", newAjax.url, true);
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newAjax.ajaxReq.send(data);
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}
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}
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newAjax.lastCalled = theTimer.getTime();
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// Store in our array
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ajaxList.push(newAjax);
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}
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function pollAJAX() {
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var curAjax = new Object();
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var theTimer = new Date();
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var elapsed;
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// Read off the ajaxList objects one by one
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for (i = ajaxList.length; i > 0; i--) {
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curAjax = ajaxList.shift();
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if (!curAjax)
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continue;
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elapsed = theTimer.getTime() - curAjax.lastCalled;
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// If we suceeded
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if (curAjax.ajaxReq.readyState == 4 && curAjax.ajaxReq.status == 200) {
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// If it has a container, write the result
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if (typeof (curAjax.container) == 'function')
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curAjax.container(curAjax.ajaxReq.responseXML.documentElement);
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else if (typeof (curAjax.container) == 'string')
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document.getElementById(curAjax.container).innerHTML = curAjax.ajaxReq.responseText;
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// (otherwise do nothing for null values)
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curAjax.ajaxReq.abort();
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curAjax.ajaxReq = null;
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// If it's a repeatable request, then do so
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if (curAjax.repeat) {
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if (elapsed >= curAjax.repeat)
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elapsed = 100;
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else
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elapsed = curAjax.repeat - elapsed;
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setTimeout("newAJAXCommand('" + curAjax.url + "',"
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+ curAjax.container + "," + curAjax.repeat + ")",
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elapsed);
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}
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continue;
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}
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// If we've waited over 4 second, then we timed out
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if ((curAjax.ajaxReq.readyState == 4 && curAjax.ajaxReq.status == 404)
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|| (elapsed > 4000)) {
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// Invoke the user function with null input
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if (typeof (curAjax.container) == 'function')
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curAjax.container(null);
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else
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// Alert the user
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alert("Command failed.\nConnection to device was lost.");
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curAjax.ajaxReq.abort();
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curAjax.ajaxReq = null;
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// If it's a repeatable request, then do so
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if (curAjax.repeat)
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setTimeout("newAJAXCommand('" + curAjax.url + "',"
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+ curAjax.container + "," + curAjax.repeat + ")", 200);
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continue;
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}
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// Otherwise, just keep waiting
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ajaxList.push(curAjax);
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}
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// Call ourselves again in 10ms?
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setTimeout("pollAJAX()", nextimeout);
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}// End pollAjax
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function getXMLValue(xmlData, field) {
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try {
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if (xmlData.getElementsByTagName(field)[0].firstChild.nodeValue)
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return xmlData.getElementsByTagName(field)[0].firstChild.nodeValue;
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else
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return null;
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} catch (err) {
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return null;
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}
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}
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//kick off the AJAX Updater
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setTimeout("pollAJAX()", nextimeout);
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