Скачать или смотреть How to Get Element Reference in Vue.js with v-if Conditions

Discover how to conditionally render elements in Vue.js using `v-if` and manage element references effectively in your component hierarchy.
---
This video is based on the question https://stackoverflow.com/q/63466341/ asked by the user 'Mitchell Yuen' ( https://stackoverflow.com/u/15592305/ ) and on the answer https://stackoverflow.com/a/63467271/ provided by the user 'Lajos Arpad' ( https://stackoverflow.com/u/436560/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Vue how to get the element reference on the element in v-if

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
How to Get Element Reference in Vue.js with v-if Conditions

When working with Vue.js, one common challenge developers face is conditionally rendering elements based on certain criteria, such as classes applied to parent elements. In this guide, we will explore how to manage element references in Vue.js, specifically when using the v-if directive.

The Problem: Conditionally Rendering Elements

Let's dive into the scenario where you need to conditionally render a <div> within a <card> that is a slide within a <carousel>. The requirement is to check if the grandparent element has the active class and then decide if the child <div> should be rendered based on that condition.

You may have attempted to achieve this using v-if in combination with a query for the class, but this approach often leads to unexpected results, especially for new Vue.js developers.

Here is a simplified version of your code setup:

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

The Solution: Using Vue.js Properties

To efficiently implement this logic, consider modifying your approach in the following ways:

1. Use a Vue Property

Instead of relying on the CSS class to determine visibility, create a property in the grandparent component that explicitly manages the active state. This approach allows you to easily pass this state down to your child components. For example:

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

Then, update the v-if in the child component:

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

2. Managing Active Classes

Sometimes you may still want to use JavaScript to manage classes dynamically. If you need to check for the active class and decide on the visibility of elements based on that, ensure that you have correctly set the class you are checking for:

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

3. Using CSS for Visual Changes

If your intent is simply to change the style of the content when active, consider utilizing CSS to apply styles based on the class without needing complex JavaScript checks. For instance, you can override default styles with:

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

Conclusion

By transitioning from checking for classes in the DOM to utilizing Vue.js state properties, you streamline your implementation and enhance the maintainability of your components. The approach not only simplifies your logic but also adheres more to Vue’s reactive nature.

Now you’re all set to conditionally render elements and manage their visibility effectively in your Vue.js applications!