How to create a Web Worker Object?

Answer

Now that we have the web worker file, we need to call it from an HTML page.

The following lines checks if the worker already exists, if not - it creates a new web worker object and runs the code in "demo_workers.js":

if(typeof(w) == "undefined") {
w = new Worker("demo_workers.js");
}

Then we can send and receive messages from the web worker.

Add an "onmessage" event listener to the web worker.

w.onmessage = function(event){
document.getElementById("result").innerHTML = event.data;
};

When the web worker posts a message, the code within the event listener is executed. The data from the web worker is stored in event.data.

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