How to Dynamically Change Element Classes in Vue.js on Click Events

Описание: Learn how to give a specific class to a clicked element and remove it from others in Vue.js, providing cleaner and more organized code than traditional approaches.
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This video is based on the question https://stackoverflow.com/q/66015394/ asked by the user 'Nightcrawler' ( https://stackoverflow.com/u/13362831/ ) and on the answer https://stackoverflow.com/a/66015464/ provided by the user 'Namysh' ( https://stackoverflow.com/u/11619167/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Dynamically Change Element Classes in Vue.js on Click Events

When building interactive applications with Vue.js, you may encounter scenarios where you want to change the appearance of elements based on user interactions. One common requirement is the need to highlight a clicked element and remove the highlight from any previously clicked elements. If you're familiar with jQuery, you might find similar functionality straightforward. However, implementing this behavior in Vue.js has its own nuances. In this guide, we’ll walk through a clean and efficient way to achieve this using Vue.js.

The Problem: Highlighting Elements on Click

Imagine you have a list of items in your app. You want to change the background color of an item only when it is clicked, meaning it should look highlighted. Moreover, if another item is clicked, the previously highlighted one should revert to its original state. While it might be tempting to manipulate classes directly with JavaScript (like in jQuery), Vue.js encourages a reactive approach that makes managing state cleaner and more efficient.

How to Approach the Solution

To solve this problem using Vue.js, you will track which item is currently selected (or clicked) using a data property. When an item is clicked, you update this property, and Vue will automatically update the DOM to reflect these changes. Let's break down the solution into clear steps.

Step-by-Step Solution

1. Initialize Your Vue Instance

First, you need to create your Vue instance. Inside, you'll define data properties and methods to manage the interaction.

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

2. Define Your Styles

Next, you should define the CSS class that will be applied to the selected item. This will typically change the background color or appearance of the clicked element.

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

3. Create the HTML Structure

In your HTML, you will loop through your list of items using v-for. Add an event listener to each item that triggers the giveColorTo method and bind the class conditionally based on whether the item is currently selected.

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

4. Explanation of the Binding

@ click="giveColorTo(y)": This directive binds the click event to the giveColorTo method, passing the current item value y.

:class="{green: selected == y}": Here, Vue's dynamic class binding is used. If the currently clicked item matches the selected property, the green class is applied, changing the item's background color.

Conclusion

By following these steps, you have successfully created an interactive list where only the clicked item is highlighted, and the highlight is removed from any previously clicked items. This approach is not only clean but also leverages Vue.js’s reactivity to efficiently manage element states with minimal manual DOM manipulation.

Implementing dynamic class changes in Vue.js is a powerful way to create engaging user interfaces. By managing state properly, you can keep your code organized and maintainable. Happy coding!