Using the Web Workers API

In this section, we'll explore the use of the Web Workers API in more detail. For the sake of illustration, we've created a simple browser page: echo.html. Using Web Workers is fairly straightforward—you create a Web Worker object and pass in a JavaScript file to be executed. Inside the page you set up an event listener to listen to incoming messages and errors that are posted by the Web Worker and if you want to communicate from the page to the Web Worker, you call postMessage to pass in the required data. The same is true for the code in the Web Worker JavaScript file—event handlers must be set up to process incoming messages and errors, and communication with the page is handled with a call to postMessage.

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