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Thread: Database Listener

  1. #1
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    Default Database Listener

    I am developing an application that communicates with Microsoft Kinect. It is geared entirely towards desktop deployment, this is not meant to run on mobile platforms. I have Kinect overwriting a value in a MySQL database when it detects certain movements. Does anyone know of any way to have Sencha Touch (1.1) listen for these database events and run a function depending on the number it reads from the database. Thanks in advance for your time!

  2. #2
    Sencha - Sr Software Engineer mitchellsimoens's Avatar
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    You can have an ajax poll every x miliseconds or you can setup websockets that will push data to the client.
    Mitchell Simoens @LikelyMitch
    Sencha Inc, Senior Software Engineer
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    Learn BBCode and use it! Checkout the CODE tag!

    Check out my GitHub, lots of nice things for Ext JS and Sencha Touch
    https://github.com/mitchellsimoens

  3. #3
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    We are attempting to use Ajax polling. Here is what we have thus far:
    Code:
    function listenForMovement(){
    	var xmlhttp;
    	if(window.XMLHttpRequest){
    		xmlhttp = new XMLHttpRequest();
    	}
    	
    	xmlhttp.onreadystatechange = function(){
    		if(xmlhttp.readyState == 4 && xmlhttp.status == 200){
    			var testVar;
    			testVar = xmlhttp.responseText;
    			detectedMove(testVar);
    		}
    	}
    	
    	xmlhttp.open("GET", "getDB.php", true);
    	xmlhttp.send();
    	
    	var t = setTimeout("listenForMovement()", 1000);
    	
    	writeToZero();
    }
    How can we get that to run repeatedly (every .25 seconds or so) inside of Sencha and call functions based on the numbers that are returned from the database. All of our button handlers are separate functions so they can be called based on Kinect gestures.

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