How to access PHP var from external javascript file

0 votes

I can access a PHP var with Javascript like this:

<?php
    $fruit = "apple";
    $color = "red";
?>

<script type="text/javascript">
    alert("fruit: " + "<?php echo $fruit; ?>"); // or shortcut "<?= $fruit ?>"
</script>

But  if I want to use an external JS file:

<script type="text/javascript" src="externaljs.js"></script>

externaljs.js:

alert("color: " + "<?php echo $color; ?>");
Jul 6, 2020 in Java-Script by kartik
• 37,490 points
2,131 views

1 answer to this question.

0 votes

Hello @kartik,

You don't really access it, you insert it into the javascript code when you serve the page.

However if your other javascript isn't from an external source you can do something like:

<?php
    $color = "Red";
?>
<script type="text/javascript">var color = "<?= $color ?>";</script>
<script type="text/javascript" src="file.js"></script>

and then in the file.js use color like so:

alert("color: " + color);

Hope it helps!

answered Jul 6, 2020 by Niroj
• 82,680 points

Related Questions In Java-Script

0 votes
1 answer

How to access GET directly from JavaScript?

Hello @kartik, You can first go through: window.location.search It will ...READ MORE

answered Apr 29, 2020 in Java-Script by Niroj
• 82,680 points
241 views
0 votes
1 answer

How do I pass variables and data from PHP to JavaScript?

Hello @kartik, Simply use one of the following ...READ MORE

answered Jul 6, 2020 in Java-Script by Niroj
• 82,680 points
329 views
0 votes
1 answer

How to send JSON data from Javascript to PHP?

Hello @kartik, PHP has a built in function ...READ MORE

answered Jul 6, 2020 in Java-Script by Niroj
• 82,680 points
1,630 views
0 votes
1 answer

How to get the file name from a full path using JavaScript?

Hello @kartik, Use this: var filename = fullPath.replace(/^.*[\\\/]/, '') This ...READ MORE

answered Sep 2, 2020 in Java-Script by Niroj
• 82,680 points
195 views
0 votes
1 answer

How do I escape a single quote in SQL Server?

Hello @kartik, Single quotes are escaped by doubling ...READ MORE

answered Jul 21, 2020 in PHP by Niroj
• 82,680 points
2,366 views
0 votes
1 answer

How to specify a port to run a create-react-app based project?

Hello @kartik, You could use cross-env to set the port, ...READ MORE

answered Jul 22, 2020 in Angular by Niroj
• 82,680 points
2,334 views
0 votes
1 answer

How do you set a default value for a MySQL Datetime column?

Hello @kartik, In version 5.6.5, it is possible ...READ MORE

answered Aug 18, 2020 in PHP by Niroj
• 82,680 points
1,401 views
0 votes
1 answer

How to move columns in a MySQL table?

Hello @kartik, If empName is a VARCHAR(50) column: ALTER ...READ MORE

answered Aug 19, 2020 in PHP by Niroj
• 82,680 points
146 views
0 votes
1 answer

How to access PHP session variables from jQuery function in a .js file?

Hello, You can produce the javascript file via ...READ MORE

answered Apr 29, 2020 in Java-Script by Niroj
• 82,680 points
5,807 views
0 votes
1 answer

How to access PHP session variables from jQuery function in a .js file?

Hello @kartik, You can produce the javascript file ...READ MORE

answered Jul 7, 2020 in Java-Script by Niroj
• 82,680 points
133 views