Скачать или смотреть Fixing the Issue with b-table and v-if in BootstrapVue for Updated Items

Discover how to effectively update state in `b-form-file` components within BootstrapVue’s `b-table` when adding files. Learn practical solutions and best practices!
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This video is based on the question https://stackoverflow.com/q/63314024/ asked by the user 'Vit Amin' ( https://stackoverflow.com/u/11140420/ ) and on the answer https://stackoverflow.com/a/63371055/ provided by the user 'Yondonjamts Ganzorig' ( https://stackoverflow.com/u/9577748/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Fixing the Issue with b-table and v-if in BootstrapVue for Updated Items

When working with BootstrapVue, particularly with the b-table component, you might encounter may hiccup, especially regarding file uploads. A common issue arises when you try to use the v-if directive, and it does not seem to work correctly with updated items—specifically, when dealing with file input states inside a table. In this guide, we’ll explore this problem and elaborate on how to resolve it effectively.

The Problem

Imagine you have a b-table with an input field for file uploads, implemented using b-form-file. After a user uploads a file, the state of b-form-file doesn’t change as expected, which can be frustrating. The immediate question is: How do you ensure that the state of your file input updates properly once a file is attached?

Here's a brief look at the current setup:

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

When a file is attached by the user, the function attachFile is executed. However, despite the file getting attached to the item, the state displayed in b-form-file does not reflect this change.

The Solution

The solution to this problem involves two key adjustments:

Proper initialization of item.file: Ensure that item.file is properly declared in the data() function.

Using a temporary data model for the file: Instead of directly modifying the item’s file state, utilize a temporary model to facilitate updates.

Let's see how these adjustments look in code:

Updated Component Code

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

Key Adjustments Explained

Initialization in data():

Declare tempFile as an empty array in your component data. This variable will temporarily hold the file input value.

Using v-model:

The v-model directive is added to bind tempFile to the b-form-file. This way, tempFile holds the current upload state before it's saved to the individual item in your items array.

Using attachFile method:

The method now takes an index and assigns the value of tempFile to item.file. After updating the file, we reset tempFile to an empty array to ensure a clean slate for future uploads.

Use of this.$nextTick():

This ensures that any DOM updates are reflected before resetting tempFile, improving reliability in the state rendering.

Conclusion

By implementing these adjustments, you’ll find that the b-form-file component within BootstrapVue’s b-table updates appropriately when a file is attached. Keeping a temporary model helps manage state more effectively, ensuring your input values are displayed as expected.

Feel free to experiment with this approach in your applications, and let us know if you face any more issues while using BootstrapVue!