Detect whether postMessage can send objects?

Question

I\'m looking for a neat way to detect whether postMessage in the browser supports the sending and receiving of objects or just strings. I figure that someone out there must

Answer 1

You could try to perform an action BEFORE resuming your script. You could try this:

dummy_task.js

self.onmessage = function(event) {
    self.postMessage(event.data);
};

javascript

workerSupportObject(callback);

function workerSupportObject(callback) {
    var callbackIsCalled = false; // to make sure callback isn't run twice
    var worker = new Worker('dummy_task.js'); // create a worker

    // create event
    worker.onmessage = function(event) {
        // if the value is the same as we sent, it probably works
        if(!callbackIsCalled) callback.call(null, event.data.value === 'dummy');
        callbackIsCalled = true;
    };

    try {
        // send dummy JSON data
        worker.postMessage({'value': 'dummy'});
    } catch(e) {
        // oh... an error... clearly that's a no.
        if(!callbackIsCalled) callback(null, false);

        callbackIsCalled = true;
    }
}

function callback(objectSupported) {
    console.log('Worker supports objects: ', objectSupported);
}