Скачать или смотреть How to Pass a Variable from JavaScript to a Laravel Controller

Learn how to send a variable from your JavaScript front end to a Laravel controller to execute a query with ease. Get step-by-step guidance on using AJAX for this process.
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How to Pass a Variable from JavaScript to a Laravel Controller

Are you grappling with the challenge of sending data from your JavaScript file to a Laravel controller? This is a common necessity for web developers, especially when the need arises to make a query based on user interactions, like clicking an element. In this guide, we will systematically uncover how to achieve this effectively using AJAX.

The Problem

Imagine you have a web application where users can click on various elements that represent data points. You want to capture the variable related to the clicked element and use it to query a database via a Laravel controller.

For instance, consider the following JavaScript function that logs the clicked value:

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

Now, you want to use this variable (var) in a Laravel controller like so:

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

The Solution: Sending Data via AJAX

To successfully pass data from the front end (JavaScript) to the back end (Laravel), you will need to make an HTTP request. The most efficient way to achieve this is by using AJAX. For Laravel projects, using a library like Axios can simplify the process of sending requests and handling responses.

Step-by-Step Guide

Here’s a straightforward method to send the variable when an element is clicked:

1. Set Up Axios

First, ensure you have Axios included in your project. If you're using Laravel with Vue.js, Axios is likely already set up. If not, you can add it by including the script tag in your HTML or installing it via npm:

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

2. Create the AJAX Request

Next, you can enhance your clicked function to make an AJAX call to your Laravel controller. Here’s how you might do it:

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

Replace /URL_HERE with the appropriate endpoint for your Laravel controller.

The variable: var is where you're sending the clicked variable to your backend.

3. Laravel Route

In your web.php routes file, set up a route that will receive the POST request:

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4. Laravel Controller Method

Finally, in your Laravel controller, define the method that will handle the request. Here’s how you can access the variable that was sent from the front end:

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

Conclusion

By following these steps, you can efficiently pass a variable from your JavaScript front end to a Laravel controller. This allows you to make queries based on user interactions, enhancing the responsiveness and interactivity of your web applications.

Remember, leveraging AJAX with Axios not only simplifies your code but also keeps your user interface dynamic and engaging. Happy coding!