How to Pass a Variable to a Different Component at the Same Level in Vue.js

Learn how to effectively pass variables between sibling components in Vue.js using event emission and parent components.
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This video is based on the question https://stackoverflow.com/q/65469760/ asked by the user 'Michele Della Mea' ( https://stackoverflow.com/u/4726997/ ) and on the answer https://stackoverflow.com/a/65470384/ provided by the user 'Joshua Angnoe' ( https://stackoverflow.com/u/14865802/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Passing a Variable Between Sibling Components in Vue.js

When developing complex applications using Vue.js, it's common to encounter situations where components need to communicate with one another. A common scenario arises when you have sibling components at the same level, and you need to pass variables or data between them. In this post, we'll explore how to efficiently pass a variable from one component to another using Vue.js.

The Problem: Sibling Components at the Same Level

Let's start with a simple use case. We have two components, report-meeting and table-report, both rendered on the same level in our Vue application. Here's a snippet of our HTML structure:

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In the report-meeting component, there is a form that, upon submission, determines whether a table in the table-report component should be displayed based on a success variable.

However, as it stands, the table-report component has no way of knowing when to update its state since both components are independently siloed.

The Solution: Using a Parent Component to Facilitate Communication

To bridge the gap between our sibling components, we can leverage a parent component that facilitates communication between them. Here's how you can implement this approach step-by-step:

Step 1: Create a Parent Component

Instead of relying on the global Vue instance, we create a new parent component that holds both our report-meeting and table-report. The parent component will manage the shared state.

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Step 2: Define the Parent Component

In the reporter-app.vue file, we will listen for an event emitted from the report-meeting component that indicates whether the table should be displayed.

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Step 3: Emit Events from the Child Component

Next, in the report-meeting component, we can emit an event when the report has been successfully generated. This can be done in the runReport method when the API call returns a successful response.

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Conclusion

By using this parent-child relationship and event emission, you can efficiently manage the state and communication between sibling components in Vue.js. This method keeps your code organized and allows for effective communication without tightly coupling your components.

Feel free to apply these concepts to your own projects and enhance the interaction between your Vue components!

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