Скачать или смотреть Resolving the Property or method is not defined Error in Vue.js

Learn how to fix the common `Property or method is not defined` error in Vue.js, specifically when using Laravel Blade templates.
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This video is based on the question https://stackoverflow.com/q/63952151/ asked by the user 'Aurilie' ( https://stackoverflow.com/u/13942146/ ) and on the answer https://stackoverflow.com/a/63952285/ provided by the user 'henrik' ( https://stackoverflow.com/u/4032222/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Resolving the Property or method is not defined Error in Vue.js

When building applications with Laravel and Vue.js, you may encounter an error that can be puzzling: "Property or method 'test' is not defined on the instance but referenced during render." If you’ve seen this while trying to pass data from a Laravel controller to a Vue component, don’t worry! This guide will help you understand the issue and guide you through the solution step-by-step.

Understanding the Problem

The error you're facing typically occurs when Vue.js tries to access a property that hasn’t been appropriately defined or passed into the component. In this specific case, you’re trying to use a variable called test within your Vue component, but the expected data is not getting to Vue as it should.

Example Code Structure

To illustrate the problem, here’s a brief overview of the code involved:

Laravel Controller: Passes data to the view.

Blade File: Renders the Vue component and attempts to pass data using Vue syntax.

Vue Component: Expects to receive the prop test for rendering.

Let's take a closer look at each section of your code:

Laravel Controller

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

Blade File

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

Vue Component (Index.vue)

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

The Solution

Now that we understand how the data is supposed to flow between Laravel and Vue.js, let's fix the underlying issue causing the error. The main problem is in the way you're passing the data from the Blade template to the Vue component. Instead of using Vue’s binding syntax (:test), you need to directly insert the data from the Laravel variable.

Step-by-Step Fix

Update the Blade File: Change how the test prop is passed to the index component. Instead of [ :test ], use double curly braces to bind the data directly from Laravel.

Here’s the corrected code for your Blade file:

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

Why This Works

By using {{ $test['test'] }}, you're directly inserting the value stored in your Laravel controller into the HTML output. When Vue initializes, it can now access test as a raw variable rather than expecting it to be a Vue instance property, thereby resolving the error.

Conclusion

Errors such as "Property or method 'test' is not defined on the instance but referenced during render" can be frustrating, especially when working with frameworks like Laravel and Vue.js. However, understanding how data is passed and accessed between these two technologies is crucial. By ensuring that you insert data correctly in your Blade templates, you can easily avoid these common pitfalls.

Now you can proceed with your development confidently, knowing how to resolve this specific error. If you encounter additional issues or have further questions, feel free to reach out or leave comments below. Happy coding!