What are Web Workers?
Types of Web Workers in HTML5
Three important types of Web workers are given below:
1. Shared Web Worker
This type uses API, and each unit of worker has multiple connections while sending a message (multiple Scripts) provided each context is from the same origin. Browser Support for this worker is limited. They are called using a shared worker() constructor.
2. Dedicated Web Worker
Creating a file is very simple just by calling a Constructor with its source path. They make use of message communication called post message () method during message transfer. Even the event handlers Are used when some listener takes place. The handler onmessage() has been used to receive a message.
3. Service Worker
This worker doesn’t directly interact with the web page and runs in the background. They can restore whenever required and acts as a proxy, and multiple threads can access them.
How to Create a Web Workers File?
They do not have support to some features like window object, DOM, The parent object. All the functions are done by passing a replica of them.
Step 1: To create a file, import Worker () constructor A file is created using a new object, and the script looks like it.
var worker = new Worker(sample.js);
Step 2: Creation of post message (). The created worker files automatically call up the post message() method. The post message () methods direct the message passing to the main thread. And similarly, we can send a message from the main thread to the worker thread. By here, the worker Starts.
Step 3: Next to throw the event handler to permit the message from the web worker.
worker. onmessage = function(event)
Henceforth we have seen how to send and receive messages, Now let’s see how to terminate the worker in the middle of the process.
Step 4: To stop the Process.
Step 5: To implement an error handling scenario worker uses.
Top 9 Features
- Web workers pay a strict execution platform for mobile and desktop windows, letting to run the web page without freezing up the web page in the browsers.
- The core benefit is we can run expensive processes within a single individual thread, which doesn’t interrupt the running main thread.
- Web-workers are small light-weighted threads that live individually, interleaving the user interface.
- Web-workers being kernel oriented threads helps in reaching out to the high performance of the browsers page.
- Web-workers help in creating parallel programming and performs multithreading actions.
- Web-workers enhances speed for java JScript application.
- Web-worker is considered to be a client-side script and used higher in games application.
- Web worker threads communicate with each other using the post Message () call-back method.
Examples of HTML5 Web Workers
Web workers have access to the navigator, XMLHTTP Request, Navigator due to their multi-processing activities. The below example focuses on dedicated workers types to demonstrate.
Shows Sample Worker file Demonstrating the working of the browser.
The following example shows how the worker tasks run behind the task using class, and the count is done for the worker tasks. The worker tasks automatically update the web page on every loop until the loop ends. To terminate the worker’s execution, terminate () has been used here.
The job is done behind the background by the web worker:
This is a guide to HTML5 Web Workers. Here we discuss the types, top 9 features of HTML5 Web Workers and its Examples with Code Implementation. You can also go through our suggested articles to learn more –