Скачать или смотреть How to Set an active Class in Vue.js for Dynamic API Data Selection

Learn how to dynamically set an active class to a list item from API data in Vue.js and toggle styles upon selection.
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This video is based on the question https://stackoverflow.com/q/64661806/ asked by the user 'srividya' ( https://stackoverflow.com/u/12444418/ ) and on the answer https://stackoverflow.com/a/64662071/ provided by the user 'Boussadjra Brahim' ( https://stackoverflow.com/u/8172857/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Set an active Class in Vue.js for Dynamic API Data Selection

In web development, creating a dynamic user experience is essential to engaging users effectively. This is especially true when building applications using frameworks like Vue.js. One common requirement is to highlight the currently selected option from a list of items fetched from an API. This guide will explore how to achieve this by setting an active class on the items, allowing users to see which option they've selected.

The Problem

Imagine you have a dropdown list of options retrieved from an API, and you want to indicate which option is currently selected. Initially, the first option should be bolded (active), and when a user clicks on another option, the active class needs to toggle to the newly selected item. This interaction enhances the usability of your application.

Sample Template

You might start with a template, which could look something like this:

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Initial Data Structure

This is how your data structure could initially appear:

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In this setup, you have a default country displayed to the user, and options being fetched from API.

The Solution

To solve the problem of toggling active classes on your list items, you will need to make a few adjustments to your Vue component. Here’s a step-by-step process to implement the solution.

Step 1: Add an Active ID Property

First, you'll want to store the currently active item's ID. This can be done by adding a new data property in your component's data function:

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Step 2: Update the Select Method

Next, modify the selectCountry method to update the activeId when a user clicks an option. This will track which item is currently selected:

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

Step 3: Bind the Active Class in the Template

Now, you need to bind the active class dynamically in your template. Modify your list item element to include a class binding:

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

In this updated version, the active class is set based on whether the item.id matches the activeId. This ensures that the correct option is highlighted based on user interaction.

Conclusion

Now you've successfully enabled dynamic highlighting of items from an API in your Vue.js application! This approach enhances user experience by providing visual feedback on their selections, making your application more interactive.

Key Takeaways

Dynamic Class Binding: Utilizing Vue's class binding feature allows you to toggle classes based on state.

State Management: By maintaining an activeId in your data, you can properly track user selections and provide a responsive UI.

Implement these strategies into your Vue.js projects, and enhance user interactions seamlessly!