How to Use a Modal Component Inside a v-for Loop in Vue.js

Learn how to implement unique modal components for each card in a Vue.js `v-for` loop, ensuring only one modal opens at a time.
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This video is based on the question https://stackoverflow.com/q/66072144/ asked by the user 'nojeong' ( https://stackoverflow.com/u/15155440/ ) and on the answer https://stackoverflow.com/a/66073777/ provided by the user 'Argo Raden' ( https://stackoverflow.com/u/11915861/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Use a Modal Component Inside a v-for Loop in Vue.js

Vue.js is a popular JavaScript framework that offers powerful tools for building interactive user interfaces. If you've ever tried to create a dynamic list of items (like cards) that each opens their own modal on click, you might have encountered some issues. In this guide, we'll explore how to effectively implement modals within a v-for loop in Vue.js to ensure each card opens only its corresponding modal.

The Problem

Imagine you have a list of cards representing different sports teams. Each card has a modal that should display detailed information about that specific team. However, there's a catch: when you click one of the cards, all modals seem to open simultaneously. This is not the expected behavior, and it usually happens because of how Vue is handling the keys in your loop.

Example Scenario

Let's take a look at a sample state containing our teams:

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

In your Vue template, you might be using a v-for loop to render cards for each team. When integrating modals, if the keys are not uniquely defined, it can result in all modals opening at once rather than just the one for the selected team.

The Solution

To fix this issue, you need to ensure that your v-for loop has a unique key for each item. This will help Vue correctly track each card's state and display the modal as intended.

Step 1: Introduce Unique Identifiers

The first step is to modify your team objects in the state by adding an id field (if you do not already have one). Here’s how your modified state might look:

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

Step 2: Modify the Template

Now, update your Vue template where you define the v-for loop. Use the id as the key like this:

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

If you don’t want to add an id, you can use an existing unique property, like name:

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

Step 3: Ensure Unique Modal IDs

In your modal, ensure that you are using a way to uniquely identify the modals as well. For instance:

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

Conclusion

By implementing unique keys in your v-for loops and setting unique modal IDs, you can ensure that each card opens its corresponding modal — avoiding the issue of all modals being activated at once. This small change makes a significant difference in how Vue.js manages the component states, leading to a better user experience.

With these changes in place, you'll have a clean, responsive interface where each sports team's card information is presented in its own modal. Now, you can focus on building and enhancing your application, knowing that your modals work correctly!

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