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How to Build a Chrome Extension

by Aaron
March 18, 2021
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How to Build a Chrome Extension
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How to Build a Chrome Extension

Have you ever ever been caught doing a repetitive job and need you would automate your course of?

Are you uninterested in spending time looking for an applicable extension, solely to be met with an empty search consequence web page?

Fortunately, in case you’re a Chrome person, you may create a Chrome extension in simply eight easy steps.

How do we all know? We created our personal Ubersuggest Google Chrome Extension to streamline our key phrase analysis methods.

On this put up, we’ll present you learn how to make a Chrome extension that can assist you innovate your duties and get again to productive work.

What’s a Chrome Extension?

Google Chrome extensions are applications you may set up in your Chrome browser to vary its performance.

Chrome extensions will help you automate sure features in your browser, modify present behaviors, and enhance your software program’s comfort. There are even Chrome extensions that can improve your SEO.

Chrome extensions are constructed with HTML, JavaScript, and CSS scripts and are primarily small web sites uploaded to the Chrome retailer.

The one distinction between a Chrome extension and an everyday web site is that Chrome extensions include a manifest file, which provides them a particular perform to execute.

One other manner to consider Chrome extensions is that they’re a chunk of code that modifications your browser expertise.

For instance, the Grammarly Chrome extension means that you can edit and modify your copy as you write. The LastPass extension will allow you to maintain your password supervisor inside your browser.

Listed here are 13 of our favorite Google Chrome extensions so that you can think about.

What Can Chrome Extensions Do?

A custom-built extension can carry out a single job. This job must be narrowly outlined and straightforward to know for it to work correctly.

You’ll be able to embrace multiple element or performance, so long as every part directs the extension in direction of a singular aim.

Chrome extensions work through the use of both web page actions or browser actions.

A web page motion is an motion that’s particular to sure pages.

A browser motion is related irrespective of the place you might be within the browser.

As effectively, your person interfaces have to be user-friendly and simple. These can vary from a single icon, consider the Gmail icon, or you may override an entire page in your interface.

Your remaining deliverable might be a zipped .crx package deal that customers will obtain and set up.

Why Ought to I Create a Chrome Extension?

Google Chrome is essentially the most extensively used looking software program on the planet. In line with W3Counter, Chrome has 65.3 percent of the total market share.

You also needs to create a Chrome extension if you’re trying so as to add a easy motion to your browser expertise.

The advantage of Chrome extensions versus common purposes is they’re usually simpler to construct and preserve. As a result of Chrome extensions are constructed round a singular perform, they take much less time and expertise to create.

Constructing a Chrome extension usually takes far much less time than constructing a completely new webpage.

In order for you a easy and efficient solution to modify your browser, then constructing a Chrome extension is the way in which to go.

Chrome extensions can even enhance your net visitors, see extra within the video beneath.

What Makes a Chrome Extension Profitable?

A profitable Google Chrome extension will simplify a job or performance and enhance your productiveness.

Let’s think about you might be an e-commerce web builder and also you’re researching competitor retailers. If you happen to set up the Koala Inspector extension, you’ll be capable to see if Shopify constructed any web site you land on. You may also see what theme was used, if any new updates have been made, and examine product statistics.

One other Chrome extension, the News Feed Eradicator for Facebook, will help enhance your productiveness by blocking your information feed so you may focus in your duties. It’s a easy however efficient perform that may enable you to enhance your each day workflow.

Each of those extensions execute a easy performance that improves person expertise. When constructing a Chrome extension, hold simplicity in thoughts. That’s the key to a profitable extension.

Your Step-by-Step Information to Making a Chrome Extension

Now it’s time to construct your Chrome extension.

It’s essential to notice that you could do that on Google Chrome. This may appear apparent, however not everybody makes use of Chrome as their default browser.

If you happen to aren’t an everyday Chrome person, make sure you set up it earlier than you start these steps.

Additionally, make sure you examine your work continuously as you progress by this course of. It’s a lot simpler to repair coding errors within the second than after you end.

Construct a Chrome Extension Step 1: Decide What Your Extension Wants

Step one in constructing your Chrome extension is to resolve on a performance.

What’s going to it do? What’s going to it appear like?

If you wish to create an extension for your Google AdWords campaigns, that is the time to resolve on the way it will work.

An icon is required for all Chrome extensions to be uploaded to the Google Chrome retailer. Remember to create or outsource an icon earlier than you start.

As soon as you understand what your Chrome extension will do, and what you need it to appear like, you can begin constructing it out.

Under, we’re going to indicate you learn how to construct an extension that can allow you to change the background coloration of your present web page.

Construct a Chrome Extension Step 2: Create a Listing for Your Extension

To start constructing your Chrome extension, you’ll must create a new directory to deal with your entire extension’s information.

That is essential as a result of, for Chrome to load your plugin, it must be pointed in direction of a folder containing your extension information.

You’ll be able to add the entire information you will want in your extension into this listing.

Construct a Chrome Extension Step 3: Make Your Extension’s Manifest File

The following step is to create your extension’s manifest file.

This file will inform Chrome learn how to load the extension correctly.

Create a file known as manifest.json and add it to your listing.

Then, add any code you would possibly must your manifest file.

For our functions, the code will appear like this:

{

“identify”: “Getting Began Instance”,

“description”: “Construct an Extension!”,

“model”: “1.0”,

“manifest_version”: 3

}

Construct a Chrome Extension Step 4: Load Your Extension into Chrome and Test for Errors

Now it’s time to check your extension to verify Chrome will run it.

Observe these steps:

  1. Go to chrome://extensions in your Google Chrome browser
  2. Test the Developer mode checkbox within the prime right-hand nook
  3. Click on “Load Unpacked” to see a file-selection dialog
  4. Choose your extension listing
example of google chrome extension loading screen

In case your extension is legitimate, it ought to load instantly.

Whether it is invalid, you will note an error message on the prime of your web page. If that is so, search for errors, right them, and check out loading your extension once more.

The most typical errors folks make listed here are syntax errors. Double-check your entire commas and brackets and ensure they’re formatted appropriately.

Additionally, be certain the Enabled field subsequent to your extension is checked so you may see it performing reside.

Construct a Chrome Extension Step 5: Develop Your Background Script

Subsequent, you’ll want so as to add some background script to inform your extension what to do.

First, create a file named background.js inside your extensions listing.

Then, add your script.

For our color-changing extension, we’ll be utilizing this script:

{

“identify”: “Getting Began Instance”,

“description”: “Construct an Extension!”,

“model”: “1.0”,

“manifest_version”: 3,

“background”: {

“service_worker”: “background.js”

}

}

This file will alert Chrome that it must scan for extra directions.

The extension we’re constructing will even require a listening occasion for runtime.onInstalled throughout the background script.

Inside the onInstall listener, the extension will set a price with the storage API. This enables a number of extension parts to run and edit that worth.

let coloration = ‘#3aa757’;

chrome.runtime.onInstalled.addListener(() => {

chrome.storage.sync.set({ coloration });

console.log(‘Default background coloration set to %cgreen’, `coloration: ${coloration}`);

});

Most API’s will have to be registered within the “permissions” subject of your manifest. Like this:

{

“identify”: “Getting Began Instance”,

“description”: “Construct an Extension!”,

“model”: “1.0”,

“manifest_version”: 3,

“background”: {

“service_worker”: “background.js”

},

“permissions”: [“storage”]

}

Subsequent, return to your extension administration web page and click on Reload.

It is best to see a brand new subject for Examine views come up. There will even be an accompanying blue hyperlink that reads the background web page.

example of chrome extension builder interface

Click on the hyperlink and you will note the background script’s console log, which reads “Default background coloration set to inexperienced”.

Content material scripts may also be added to run page-by-page scripts.

Content material scripts must be added straight into your manifest file.

Construct a Chrome Extension Step 6: Create Your Consumer Interface

Your extension can have a spread of user-interfaces, from pop-ups to tooltips, and extra.

To start designing your interface, you could register a browser motion in your manifest.

For our instance, we’ll use a pop-up. The code seems to be like this:

<!DOCTYPE html>

<html>

<head>

<hyperlink rel=”stylesheet” href=”button.css”>

</head>

<physique>

<button id=”changeColor”></button>

</physique>

</html>

You’ll must declare this code inside your manifest to ensure that it to work.

To do that, add an motion to your manifest and set popup.html because the motion’s default_popup.

Your script ought to appear like this:

{

“identify”: “Getting Began Instance”,

“description”: “Construct an Extension!”,

“model”: “1.0”,

“manifest_version”: 3,

“background”: {

“service_worker”: “background.js”

},

“permissions”: [“storage”],

“motion”: {

“default_popup”: “popup.html”

}

}

This particular pop-up references a CSS script, so that you’ll want so as to add one other file to your listing. Title it appropriately, and add this:

button {

peak: 30px;

width: 30px;

define: none;

margin: 10px;

border: none;

border-radius: 2px;

}

button.present {

box-shadow: 0 0 0 2px white,

0 0 0 4px black;

}

For our instance, you’ll additionally need to add coloration to your popup buttons. In a while, this coloration might be used for the background of your web page as effectively.

Create and add a file named popup.js with the next code to the listing.

// Initialize button with person’s most well-liked coloration

let changeColor = doc.getElementById(“changeColor”);

chrome.storage.sync.get(“coloration”, ({ coloration }) => {

changeColor.fashion.backgroundColor = coloration;

});

It will seize the button from popup.html and request the colour worth. Embody a script tag to popup.js in popup.html like this:

<!DOCTYPE html>

<html>

<head>

<hyperlink rel=”stylesheet” href=”button.css”>

</head>

<physique>

<button id=”changeColor”></button>

<script src=”popup.js”></script>

</physique>

</html>

From there, you may add badges to indicate the state of your extension. For instance, a badge can inform a person if the extension is activated or not, on or off.

an icon showing on funtionality and a water drop below it

Toolbar icons fall underneath motion within the default_icons subject.

Place any desired photographs inside your listing after which inform the extension learn how to use the photographs.

{

“identify”: “Getting Began Instance”,

“description”: “Construct an Extension!”,

“model”: “1.0”,

“manifest_version”: 3,

“background”: {

“service_worker”: “background.js”

},

“permissions”: [“storage”],

“motion”: {

“default_popup”: “popup.html”,

“default_icon”: {

“16”: “/photographs/get_started16.png”,

“32”: “/photographs/get_started32.png”,

“48”: “/photographs/get_started48.png”,

“128”: “/photographs/get_started128.png”

}

}

}

For photographs, 16×16 and 32×32 sizes are advisable. All icons must be sq., or else they could find yourself distorted.

If you happen to don’t provide an icon, Chrome will add a default one for you.

When designing your Chrome extension person interface, hold it easy and user-friendly.

Google says all extension interfaces should add to a browsing experience, not distract from it.

Earlier than transferring on, reload your extension and ensure every part seems to be proper.

Construct a Chrome Extension Step 7: Add in Some Logic

Logic furthers your person interface interplay.

Add logic scripts to no matter user-interface choices you included.

Logic can inform your extension to carry out sure actions, resembling what to do when a button is clicked.

For instance, in case you used the popup.js script, you’ll need to embrace your logic on the finish of it.

For our instance, you should utilize this script:

// When the button is clicked, inject setPageBackgroundColor into present web page

changeColor.addEventListener(“click on”, async () => {

  let [tab] = await chrome.tabs.question({ lively: true, currentWindow: true });

  chrome.scripting.executeScript({

    goal: { tabId: tab.id },

    perform: setPageBackgroundColor,

  });

});

// The physique of this perform might be executed as a content material script contained in the

// present web page

perform setPageBackgroundColor() {

  chrome.storage.sync.get(“coloration”, ({ coloration }) => {

    doc.physique.fashion.backgroundColor = coloration;

  });

}

perform setPageBackgroundColor() {

chrome.storage.sync.get(“coloration”, ({ coloration }) => {

doc.physique.fashion.backgroundColor = coloration;

});

}

This code triggers a programmatically injected content script. This turns the background coloration of the web page to the identical coloration as your beforehand added button.

From right here, your extension must be totally practical. Any new additions might be bells and whistles.

Construct a Chrome Extension Step 8: Check Out Your Extension

Identical to A/B testing in marketing, it’s essential to constantly take a look at your extension to make sure every part works.

Try it out your self, or have another person take a look at it.

If in case you have one other particular person take a look at it, do it with out giving them directions to verify it’s intuitive to make use of.

Make modifications as wanted, then take a look at your extension once more.

Even after you launch your extension, you may constantly optimize and enhance it. That’s how we acquired the Ubersuggest Chrome extension 2.0.

When you’re joyful, it’s prepared to make use of.

Can I Observe Making a Chrome Extension?

When you add your extension to the Chrome retailer it’s reside and usable.

If you happen to don’t need your Chrome extension to be publicly accessible, you may at all times make a GitHub repo that individuals can clone from.

This requires giving folks entry to your supply code, so make sure you think about this earlier than importing something onto GitHub.

You may also experiment with open supply samples earlier than diving into your extension.

Samples for Chrome Extensions can be found on Google’s GitHub.

Conclusion

Making a {custom} Google Chrome extension is an effective way to enhance your browser performance and create optimal user experiences.

What’s extra, your tool can drive traffic to your web site, so modifying that have can lead to new leads for your online business.

Keep in mind, a number of the most powerful Chrome extensions have been constructed by folks identical to you!

It could be a studying curve to get your extension the place you need it to be, however it’s value it when you’ve an thrilling new function to indicate off to your pals—and potential purchasers.

What sort of Chrome extensions have you ever constructed?

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