Detect If Javascript Is Disabled

This makes it easier to reuse code, allows you to use object/feature detection for the entire, You can also detect if JavaScript is enabled based on the success of running JavaScript, detects JavaScript being disabled and executes the embed HTML., is disabled., However, how likely is it someone disables CSS and not Javascript?

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How to detect that JavaScript and/or Cookies are disabled?

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Alert does not trigger, JS is not detected

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Code if javascript disabled

Last updated: Jan 12, 2023
Reading time · 4 min

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# Table of Contents

# Check if an Element is Disabled using JavaScript

Use the disabled property to check if an element is disabled, e.g. if (element.disabled) <> .

The disabled property returns true when the element is disabled, otherwise false is returned.

Here is the HTML for the examples.

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DOCTYPE html> html lang="en"> head> title>bobbyhadz.comtitle> meta charset="UTF-8" /> head> body> input disabled type="text" id="first_name" name="first_name" /> script src="index.js"> script> body> html>

And here is the related JavaScript code.

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const element = document.getElementById('first_name'); console.log(element.disabled); // 👉️ true if (element.disabled)  console.log('✅ element is disabled'); > else  console.log('⛔️ element is not disabled'); > // ✅ Set attribute disabled // element.setAttribute('disabled', '') // ✅ Remove the attribute disabled // element.removeAttribute('disabled');

The disabled property on an element returns true if the element is disabled and false otherwise.

When the disabled attribute is set on the element, the element is not mutable and cannot be focused.

# Why you shouldn’t use the getAttribute() method

Some examples online use the getAttribute() method on the element. However, boolean attributes like disabled might not have a value.

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const element = document.getElementById('first_name'); // 👇️ returns empty string console.log(element.getAttribute('disabled')); // ❌ DON'T DO THIS if (element.getAttribute('disabled'))  console.log('✅ element is disabled'); > else  console.log('⛔️ element is not disabled'); >

The getAttribute method returns the value of the provided attribute on the element.

However, it’s a best practice to set boolean attributes, such as disabled , without a value.

If a boolean attribute is present at all, regardless of the value, its value is considered to be true .

If a boolean attribute is not present, the value of the attribute is considered to be false .

Therefore, the disabled attribute could be set without a value on the element and the getAttribute method would return a false negative.

If you need to remove the disabled attribute from an element, use the removeAttribute() method.

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const element = document.getElementById('first_name'); // ✅ Remove attribute disabled element.removeAttribute('disabled');

The removeAttribute method removes the provided attribute from the element.

If you need to set the disabled attribute on an element, use the setAttribute() method.

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const element = document.getElementById('first_name'); // ✅ Set attribute disabled element.setAttribute('disabled', '');

The method takes the following 2 parameters:

name — the name of the attribute to be set.
value — the value to assign to the attribute.

We provided an empty string as the value for the disabled attribute because it’s a best practice to set boolean attributes without a value.

# Check if an Element is Required using JavaScript

Use the required property to check if an element is required.

The required property returns true when the element is required, otherwise false is returned.

Here is the HTML for the examples.

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DOCTYPE html> html lang="en"> head> title>bobbyhadz.comtitle> meta charset="UTF-8" /> head> body> input required type="text" id="first_name" name="first_name" /> script src="index.js"> script> body> html>

And here is the related JavaScript code.

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const element = document.getElementById('first_name'); console.log(element.required); // 👉️ true if (element.required)  console.log('✅ The element is required'); > else  console.log('⛔️ The element is not required'); > // ✅ Set the required attribute // element.setAttribute('required', '') // ✅ Remove the required attribute // element.removeAttribute('required');

The required property on an element returns true if the element is required and false otherwise.

When the required attribute is set on an element, the user must specify a value for the input before the form can be submitted.

# Caveats when using getAttribute to check if required

Some examples online use the getAttribute() method on the element, however boolean attributes like required might not have a value.

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const element = document.getElementById('first_name'); // 👇️ returns an empty string console.log(element.getAttribute('required')); // ❌ DON'T DO THIS if (element.getAttribute('required'))  console.log('✅ element is required'); > else  console.log('⛔️ element is not required'); >

The getAttribute method returns the value of the provided attribute on the element.

However, it’s a best practice to set boolean attributes, such as required , without a value.

If a boolean attribute is present at all, regardless of the value, its value is considered to be true .

If a boolean attribute is not present, the value of the attribute is considered to be false .

Therefore the required attribute could be set without a value on the element and the getAttribute method would return a false negative.

If you need to remove the required attribute from an element, use the removeAttribute() method.

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const element = document.getElementById('first_name'); element.removeAttribute('required');

The removeAttribute method removes the provided attribute from the element.

If you need to set the required attribute on an element, use the setAttribute() method.

Copied!
const element = document.getElementById('first_name'); element.setAttribute('required', '');

The method takes the following 2 parameters:

name — the name of the attribute to be set.
value — the value to assign to the attribute.

We provided an empty string as the value for the required attribute because it’s a best practice to set boolean attributes without a value.

I wrote a book in which I share everything I know about how to become a better, more efficient programmer.

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Detect If Javascript Is Disabled

Hey everyone! Welcome to today’s tutorial. In this tutorial, we will learn how to detect if javascript is disabled . We will display a message if the browser does not support javascript or if the user has turned off javascript. To do this, we need just HTML. We will learn to use a special tag called .

Video Tutorial:

If you are interested to learn by coding along with a video tutorial rather than reading this blog post, please check out the video down below. I post new tips, tricks and tutorials related to web development on my youtube channel regularly.

So subscribe to my youtube channel, so you don’t miss out on these useful resources.

Project Folder Structure:

Before we start to code, let us take a look at the project folder structure. We create a project folder called – Detect If Javascript Is Disabled. Inside this folder, we have two files – index.html and style.css. The first file is the HTML document, while the second one is the stylesheet.

HTML:

Let us start with the HTML. First, copy the code provided to you below and paste it into your HTML document.

The HTML contains a div with the class name – wrapper. We have to wrap all the elements inside this wrapper. For the sake of the demo, I have just used only one h1 element. The h1 tag consists of the text – Javascript is Enabled. This text will help you recognize if our code is working.

Next, we use a tag called . Many of you might have never heard about it or used it. So let us understand what is . Basically will define content that we need to display in case the user has turned off javascript.

Now we use a tag in which we set the display of wrapper to none. What this means is – if the browser doesn’t support javascript or if javascript is turned off by the user then simply hide everything wrapper inside the wrapper element.

We now have to set a message to be displayed if the user disables javascript. For that, we use div with the class – “msg”. Inside this div, we have the text – Javascript is Disabled .

So when the user turns off javascript, the tag will hide all the elements on the page and will display a message informing the user has turned off javascript.

          Javascript is Enabled

CSS:

Now for the CSS part. I have used CSS only to make the output a little bit attractive. It does not affect the functionality of the code in any way. So you can skip the CSS code. Since we do not require it, I won’t be explaining the CSS code.

* < padding: 0; margin: 0; box-sizing: border-box; font-family: "Poppins", sans-serif; >.wrapper, .msg < position: absolute; transform: translate(-50%, -50%); top: 50%; left: 50%; text-align: center; font-weight: 600; >.wrapper h1, .msg < font-size: 60px; >.wrapper span, .msg span

That’s it for this tutorial. If you have any issues while creating this code, you can download the source code by clicking on the ‘Download Code’ button below. Also, if you have any queries, suggestions, or feedback drop them in the comments below.
Happy Coding!

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