Is it feasible to pre-fill a PHP form field with JSON data?

I am facing a challenge where I need to automatically fill in a field with the email address of the user who logged into the system. The issue is that this application is used by different clients, so I need to dynamically add the necessary code to the external JavaScript file. I have been experimenting with JSON data, but I am unsure if this is the right approach.

Here is an excerpt from my PHP code:

<?php
$myemail = $this->session->userdata('USER_EMAIL');
//echo $myemail;

Following that, I have the following snippet:

var $jsonEmail = trim(json_encode($myemail));

Then, in my custom JavaScript page, I included this:

var jsonObj = $jsonEmail;
document.getElementById("email-12").innerHTML=jsonObj.value;

Unfortunately, the solution does not seem to be working as expected. As I am relatively new to this, I am struggling to identify what I may be doing wrong. Any guidance or assistance on this matter would be greatly appreciated.

Answer №1

Combining PHP and JavaScript in this way is not effective. To properly integrate the two, ensure your PHP code resembles the following:

$jsonEmail = trim(json_encode($myemail)); // Remove 'var'

And your JavaScript code should take this form:

var jsonObj = <?php echo $jsonEmail; ?>

Answer №2

Here's a workaround that may not be the cleanest solution, but it should get the job done.

var jsonObj = <?php echo $jsonEmail ?>;
document.getElementById("email-12").innerHTML=jsonObj.value;

It's important to note that you cannot directly mix server-side PHP with client-side JavaScript. PHP processes text on the server side and outputs HTML or JavaScript for the browser to interpret.

Answer №3

To transfer the content of your $jsonEmail variable to JavaScript, simply echo it out like this:

var emailData = <?php echo $jsonEmail; ?>
document.getElementById("email-12").innerHTML=emailData.value;

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