Web and WebWorks Development

[kalan]

I tried to use web worker thread to call a web service via XMLHttpRequest. When calling 'send' method the app crashes.

What can be the reason?

Can we use web workers to call web services via XMLHttpRequest?

Thanks.

[tneil]

Hi kalan,

Can you post up your BlackBerry OS version and maybe some sample JavaScript that replicates the problem?

[kalan]

I'm using this code with playbook.

I call 'myWebworker' when a button press event occurs,

function myWebworker() {	
	var worker = new Worker('Scripts/worker.js');
	worker.onmessage = function() {
	    alert("Worker says: ");
	};
	worker.postMessage(); 
}

is the main code and following is the worker.js code.

onmessage = function() {
	
	var xmlHttp = new XMLHttpRequest();
	url = "myURL";
	xmlHttp.open('POST', url, false);
	xmlHttp.setRequestHeader("Content-Type", "text/xml; charset=utf-8");
	var param = "myXML";
	xmlHttp.onreadystatechange = function() {
		postMessage();
		if (xmlHttp.readyState == 4 && xmlHttp.status == 200) {
		   var node = getStrNodeValues(xmlHttp.responseXML
					.getElementsByTagName("Status"));
		   var authToken = getStrNodeValues(xmlHttp.responseXML
					.getElementsByTagName("Token"));
			
		}
	};	
	xmlHttp.send(param);
	
};

When I call 'xmlHttp.send(param)',  the app crashes.

Otherwise the worker works perfectly. but can't call the web service.

Thanks.

[tneil]

I take it this is in a WebWorks app?

If so, have you white listed the URL of the AJAX call in your config.xml file?

[kalan]

Yes sir,

This works perfectly without using a worker.

Thanks.

[tneil]

From our investigation we have found that the same code in Safari and Chrome will produce a reuslt of 405.  This only happens if you try and use POST instead of GET in your AJAX call from a worker.  I'm not sure if this is simply a WebKit bug, or a security measure.

However, the signature of the crash is definately a bug and it has been submitted to our Browser team to ensure that it gets fixed.