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The programming language JavaScript runs in the browser. By dynamically updating content, validating form data, managing multimedia, animating graphics, and nearly everything else on the web pages, it transforms static HTML web pages into interactive web pages. In this blog, we will give you some solutions for fixing error cannot read property ‘style’ of Null in JavaScript. Read on it.
When do you get the error “cannot read property ‘style’ of Null” in JavaScript?
When you run your program, you easily get the following warning message:
Cannot read property 'style' of Null There are two primary causes of the error “Cannot read property style of null”:
You have accessed a DOM element’s style property that doesn’t exist. And you have placed the JS script tag over the HTML, where you declare the DOM elements.
Below is an example of how the error happens.
Code:
const exp = null;
console.log(exp.style);Output:
Uncaught TypeError: Cannot read properties of null (reading 'style')When you use the getElementById() method and pass it to an id that does not exist in the DOM, the error most frequently happens.
Code:
const squares = document.getElementById('Null in Javascrift');
console.log(squares);
squares.style.color = 'greenyelow';Output:
Uncaught TypeError: Cannot read properties of null (reading 'style')How to solve the error “cannot read property ‘style’ of Null” in JavaScript?
Method 1: Ensure that the DOM element on which you are trying to access the style property already exists
To fix the error “cannot read property ‘style’ of Null” in JavaScript, you have to ensure that the DOM element on which you are trying to access the style property already exists.
The getElementById function returns null in the example because there is no element with the specified id in the DOM. The problem occurs when you attempt to access the style property on a null value.
Placing the JS script tag before declaring the DOM elements is another frequent cause of the issue.
Method 2: Ensure that a valid id must exist for the element you are attempting to access
To fix the error, you have to ensure that a valid id must exist for the element you are attempting to access. Make sure to type that id accurately and omit the # from its name when calling the document.getElementById() function. Make sure the specified class name is spelled correctly and defined on the element(s) you want to access if you want to utilize document.getElementByClassName().
HTML code:
<!DOCTYPE html>
<html lang="en">
<title>Fixing “cannot read property ‘style’ of Null"</title>
<div id="exp_div" class="exp_class">
<h1>Welcome to Ittutoria.net</h1>
</div>
<head>
<meta charset="UTF-8" />
</head>
<body>
<script src="main.js"></script>
</body>
</html>And here is the detail of the code JavaScript:
document.getElementById("exp_div").style.color = "blue";
document.getElementsByClassName("exp_class")[0].style.backgroundColor = "greenyellow";Output:
......... ADVERTISEMENT .........
..8..
Method 3: Ensure that the JS script tag is located at the bottom of the body, following the declaration of the HTML elements
Excepting two methods mentioned above, there is another for you to solve the error “cannot read property ‘style’ of Null” in JavaScript. You have to ensure that the JS script tag is located at the bottom of the body, following the declaration of the HTML elements.
<!DOCTYPE html>
<html lang="en">
<title>Fixing “cannot read property ‘style’ of Null"</title>
<head>
<meta charset="UTF-8" />
</head>
<body>
<script src="main.js"></script>
<div id="exp_box" style="color: goldenrod"><b>Hi! Welcome to Ittutoria!</b></div>
</body>
</html>The main.js file is executed before the DOM element is created because you have inserted JS script tag before the div element is declared.
As a result, the main.js file’s div won’t be accessible.
const exp_box = document.getElementById('exp_box');
console.log(exp_box);
exp_box.style.color = 'green';Output:
In the HTML window:
......... ADVERTISEMENT .........
..8..
In the Console window:
......... ADVERTISEMENT .........
..8..
You must plave the JS script tag after the HTML components and at the bottom of the body as the following code:
<!DOCTYPE html>
<html lang="en">
<title>Fixing “cannot read property ‘style’ of Null”</title>
<head>
<meta charset="UTF-8" />
</head>
<body>
<div id="exp_box" style="color: goldenrod"><b>Hi! Welcome to Ittutoria!</b></div>
<script src="main.js"></script>
</body>
</html>The main.js file now has the div element.
const exp_box = document.getElementById('exp_box');
console.log(exp_box);
exp_box.style.color = 'green';Output:
In the HTML window:
......... ADVERTISEMENT .........
..8..
In the Console window:
......... ADVERTISEMENT .........
..8..
The HTML elements is established before you run the index. js script. When the js script is executed, you can access the DOM element.
Conclusion
Through the above article, we have given some instructions to handle Javascript errors cannot read property ‘style’ of Null in JavaScript. Read and choose the method that works for you. If you have any difficulties, you can contact us immediately or leave a comment below. Thanks for reading!
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