Скачать или смотреть How to Dynamically Add CSS Class Styles on Button Click in Angular

Learn how to use Angular's binding feature to toggle CSS classes dynamically on button click, allowing for effective background and text color changes.
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How to Dynamically Add CSS Class Styles on Button Click in Angular

Introduction

In web development, creating a seamless user experience often involves dynamic interactions like changing styles based on user actions. One common requirement is to toggle CSS classes on elements when a button is clicked. In Angular, this functionality can be achieved easily using class binding. In this post, we will explore how to change the background and text colors on button click to switch between light and dark modes, effectively enhancing the visual experience of your application.

The Problem at Hand

Imagine you have a button that, when clicked, should change the background color and the text color of a section on your webpage. You want this change to toggle back to the original colors when the button is clicked again. In this particular case, we are looking to apply two CSS classes: .bgdark for a dark background and .textlight for light text color to a div with the class mainbody. Let’s dive into the solution!

Step-by-Step Solution

1. Setting Up the HTML Structure

To begin implementing this feature, you need a basic HTML structure. Here's how you can set it up:

[[See Video to Reveal this Text or Code Snippet]]

Explanation:

The div element with the class mainbody will change its background when the bgnight class is added or removed.

The (click) event on the button triggers the toggling of the haveClass variable.

2. Modifying the Component Code

Next, you will need to define the haveClass variable within your Angular component. This variable will keep track of whether the dark mode is active or not.

[[See Video to Reveal this Text or Code Snippet]]

Explanation:

haveClass is a boolean variable initialized to false, which means that the dark mode is off by default.

3. Adding the CSS Styles

Now, let's define the CSS styles for the classes we are going to toggle. Ensure you have the following styles in your CSS file:

[[See Video to Reveal this Text or Code Snippet]]

Explanation:

.bgnight applies a black background when active.

.textlight changes the text color to white for better readability against a dark background.

4. Putting It All Together

Once you have your HTML, component, and CSS ready, your Angular application will dynamically adjust the styles of the div and provide immediate feedback when the button is clicked.

Conclusion

By leveraging Angular's built-in capabilities for class binding, you can effortlessly toggle CSS classes in response to user interactions. This technique not only enhances the user experience but also keeps the code clean and organized. Now you can build dynamic interfaces that respond to user input effectively! If you have further questions or need additional examples, feel free to ask!