Just Learn Code

Mastering the Art of Hiding Elements by Class Using JavaScript

Hiding elements by class using JavaScript

Have you ever needed to hide elements on a webpage based on their class name? Perhaps you have a group of elements that you want to hide until a certain action is taken on the page or a certain condition is met.

Using JavaScript, you can easily hide elements by class name.

Hide element by class name

The first method we will look at is hiding a single element by its class name. To do this, we can use the `getElementsByClassName()` method to retrieve all elements with a particular class name.

This method returns an HTMLCollection, which is similar to an array of all elements with the specified class name. Once we have an HTMLCollection, we can use a `for…of` loop to iterate over each element and set its `style.visibility` property to either `hidden` or `collapse`.

The difference between these two values is that `hidden` hides the element but still takes up space in the layout, while `collapse` hides the element and removes it from the layout entirely. Here is an example of how to hide an element by class name using JavaScript:

“`

const elements = document.getElementsByClassName(‘example-class-name’);

for (const element of elements) {

element.style.visibility = ‘hidden’;

}

“`

This code will retrieve all elements with the class name ‘example-class-name’ and hide them from view.

Hide all elements by class

If you want to hide all elements on the page with a particular class name, you can modify the code above to use `style.display` instead of `style.visibility`. The `display` property determines whether an element is visible or not, and setting it to `none` will hide the element entirely.

Additionally, we can use `Array.from()` to convert the HTMLCollection into an array, and then use `Array.forEach()` to loop over each element. Here is an example of how to hide all elements by class name using JavaScript:

“`

const elements = Array.from(document.getElementsByClassName(‘example-class-name’));

elements.forEach(element => element.style.display = ‘none’);

“`

This code will retrieve all elements with the class name ‘example-class-name’, convert them into an array, and then hide them from view.

Differences between using style.visibility and style.display to hide elements

Now that we have looked at how to hide elements by class using JavaScript, let’s take a closer look at the differences between using `style.visibility` and `style.display`. Using `style.visibility` sets the visibility of an element, but does not remove it from the layout of the page.

The element will still take up space on the page, even though it is not visible. This can be useful when you want to keep the layout of the page intact while hiding certain elements.

On the other hand, using `style.display` removes the element from the layout entirely. The element will not take up any space on the page, and the layout will adjust to fill in the empty space left by the hidden element.

This can be useful when you want to completely remove an element from the page.

Conclusion

In conclusion, hiding elements by class using JavaScript is a useful technique for controlling the visibility of elements on a webpage. By using `getElementsByClassName()` and either `style.visibility` or `style.display`, you can easily hide elements on the page based on their class name.

Additionally, understanding the differences between `style.visibility` and `style.display` can help you choose the right method for hiding elements based on your specific needs. Additional Resources:

If you are just starting out with JavaScript and want to learn more about manipulating the DOM, here are some additional resources to check out:

1.

MDN Web Docs: Getting started with the DOM

MDN Web Docs provides a comprehensive guide to getting started with the DOM. This resource covers topics such as selecting elements, manipulating elements, and handling events.

2. W3Schools: JavaScript DOM Tutorial

W3Schools offers a practical and hands-on tutorial for learning about the DOM.

This tutorial covers topics such as selecting elements, manipulating elements, and working with properties and methods. 3.

JavaScript.info: Document and Events

JavaScript.info provides a thorough overview of working with the DOM, including selecting elements, manipulation, attributes, and events. This resource also covers advanced topics such as performance and API design.

4. Codecademy: Learn JavaScript

Codecademy provides an interactive and gamified way of learning JavaScript.

This course covers topics such as loops, functions, arrays, and the DOM. 5.

YouTube: Traversy Media (Vanilla JavaScript)

Traversy Media offers a series of tutorials on JavaScript, with a focus on vanilla JavaScript. This resource covers topics such as the DOM, arrays, functions, and related technologies such as AJAX and JSON.

Now, let’s dive deeper into the topics covered in the original article.

Hiding elements by class using JavaScript

One important issue to keep in mind when hiding elements by class using JavaScript is that there may be more than one element on the page with the same class name. In this case, using `getElementsByClassName()` will return an HTMLCollection with all of the matching elements.

To hide only a particular element, you may need to use additional logic to select the correct one. For example, you can use the `querySelector()` method to select a particular element based on its class name and other attributes.

Here is an example of how to select a single element with a particular class name:

“`

const element = document.querySelector(‘.example-class-name’);

element.style.visibility = ‘hidden’;

“`

This code will select the first element on the page with the class name ‘example-class-name’ and hide it from view. Additionally, you can use CSS selectors to select elements based on more complex criteria, such as the value of certain attributes, the presence of other elements, and so on.

For example, you can use the following code to select all elements with a class name that includes the word ‘example’:

“`

const elements = document.querySelectorAll(‘[class*=example]’);

elements.forEach(element => element.style.display = ‘none’);

“`

This code will select all elements on the page with a class name that includes the word ‘example’, and hide them from view. Differences between using style.visibility and style.display to hide elements

When using `style.display` to hide elements, it’s important to understand that the `display` property is part of the CSS box model.

This means that changing the value of `display` can affect the layout of the page, especially if the element is a block-level element such as a div or p tag. For example, if you set an element’s `display` property to `none`, it will no longer take up space in the layout.

This can cause other elements to shift around, potentially affecting the appearance of the page. On the other hand, when using `style.visibility` to hide elements, the layout of the page is not affected.

The element still takes up the same amount of space, but is simply hidden from view. Overall, the choice between using `style.visibility` and `style.display` depends on the specific needs of your application.

If you need to remove an element from the layout entirely, `style.display` may be the better option. If you need to simply hide an element without affecting the layout, `style.visibility` may be the way to go.

Closing Thoughts

The DOM is a powerful tool for manipulating web pages, and JavaScript provides an easy way to work with it. By mastering the basics of selecting and manipulating elements, you can create dynamic and interactive interfaces for your users.

Remember to always test your code thoroughly and think about the impact of any changes you make to the layout of the page. By keeping these best practices in mind, you can ensure that your JavaScript code is robust and reliable.

In conclusion, hiding elements by class using JavaScript is a valuable tool for controlling the visibility of elements on a webpage. By using getElementsByClassName() and either style.visibility or style.display, developers can easily hide elements on the page based on their class name.

It’s important to bear in mind the differences between style.visibility and style.display, since each affects the layout of the page in a different way. In addition to the main points discussed, further resources such as MDN Web Docs and W3Schools can provide a more in-depth understanding of JavaScript DOM manipulation.

By mastering the basics of the DOM, developers can create engaging and responsive interfaces for their applications.

Popular Posts