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javascript - Passing variable from JS to PHP within the same page

Hey everyone,

I'm currently working on a project and I need some help with passing a variable from JavaScript to PHP within the same page. I've looked at some tutorials online, but I can't seem to get it working properly.

Here's a bit of context about my project:

I have a webpage where users can input some data using a form. Once the user submits the form, I want to take that data and perform some calculations with it using JavaScript. After the calculations are done, I need to pass the result back to PHP so that I can save it to a database or do some further processing.

I've tried using AJAX to send the data to a separate PHP file, but I would like to avoid making additional HTTP requests if possible. Is there a way to accomplish this without leaving the page?

Any help or guidance would be greatly appreciated. Thanks in advance!

All Replies



I completely understand your situation, as I've faced a similar challenge in one of my projects as well. While the method suggested by User 1 definitely works, I found a slightly different approach that might be useful for you.

Instead of updating hidden input fields, you could use the localStorage feature in JavaScript to store the calculated result and then retrieve it in your PHP code. Here's how you can do it:

1. In your JavaScript function where you perform the calculations, store the calculated result in localStorage. For example, you can use `localStorage.setItem('result', calculatedResult);` to save the result.
2. When the form is submitted, you can access the stored result in your PHP code by using the `$_POST` or `$_GET` superglobal, as mentioned earlier.
3. Retrieve the value from localStorage using JavaScript in the PHP script before processing it. For instance, you can utilize `let result = localStorage.getItem('result');` to fetch the stored value.

By using localStorage, you can store and retrieve the result without the need for additional AJAX requests or hidden input fields. It offers a simple and seamless way to pass data between JavaScript and PHP within the same page.

I hope this alternative solution proves useful to you. Feel free to reach out if you have any more queries!


Hey there!

I've faced a similar situation in one of my projects before, and I found a solution that worked for me. Instead of making a separate AJAX request or leaving the page, you can use JavaScript/jQuery to dynamically update hidden input fields within your form. These hidden inputs can then be accessed by PHP when the form is submitted.

Here's a step-by-step approach that might help you:

1. In your JavaScript function where you perform the calculations, grab the result you want to pass to PHP.
2. Use JavaScript/jQuery to update the value of a hidden input field on your page with the calculated result.
3. When the user submits the form, PHP will receive the updated value of the hidden input field along with other form data.
4. In your PHP code, you can access the value of the hidden input using the `$_POST` or `$_GET` superglobal, depending on your form submission method. For example, if your hidden input has a name attribute like `result`, you can access it in PHP using `$_POST['result']` or `$_GET['result']`.

This way, you'll be able to pass the JavaScript-calculated result back to PHP without leaving the page or making additional requests. It's a convenient solution if you prefer to handle everything on the same page.

I hope this helps! Let me know if you have any further questions.

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