PHP Script in OnClick Event

Question

This IS a duplicate from Calling a php function by onclick event, but I have a question on it. The answer I had a question on is by timpanix, and basically it won't work.

He said to execute some PHP code in a On Click event do this:

onclick="document.write('<?php //call a PHP function here ?>');"

and call the PHP function. Yet whenever I try it:

<button id="profileinformationbutton" input type="submit" value="Login" onclick="document.write('<?php profileupdated() ?>');"> Update Profile </button>

it prints out ');" > Update Profile, yet I have no clue why. It is inside of a form, and the PHP function looks like this:

<?php
    function profileupdated() {
?>
        <div id="profileupdated"> Profile Updated </div>
<?php
    }
?>

Why would the code be displaying this? Please help! :) Thank You.

EDIT

The code does not seem to be writing Profile Updated to the page, any idea why?

possible duplicate of What is the difference between client-side and server-side programming? — Dan Smith
– Dan Smith, Commented Feb 9, 2015 at 17:32
escape the double quotes inside your php function to fix your problem — Lorenzo Marcon
– Lorenzo Marcon, Commented Feb 9, 2015 at 17:34
You're echo div with double quote attribute inside double quote attribute. The php code will not execute on the client but on the server before html is rendered. — jcubic
– jcubic, Commented Feb 9, 2015 at 17:34

hakki · Accepted Answer · 2015-02-09 17:52:00Z

1

    function profileupdated() {

        echo "<div id='profileupdated'> Profile Updated </div>";

    }

Also if you only want to print this value to your tag why you're using function? Assign it to a variable.

like

$myVar = '<div id="profileupdated"> Profile Updated </div>';

Then use this variable where you want?

you should echo or return your function body. Carefull! I changed quotes!

edited Feb 9, 2015 at 17:52

answered Feb 9, 2015 at 17:32

hakki

1

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4 Comments

michael jones Over a year ago

Updated with one more little question :)

hakki Over a year ago

Where did you define your function? Another page, in class .. ?

War10ck Over a year ago

@hakkikonu You're missing a < before your echo statement in your second example...

michael jones Over a year ago

Thank You! :) BTW for the variable would I just do this? onclick="document.write('<?php $variablehere ?>');"

Grüse · Accepted Answer · 2015-02-09 17:49:21Z

0

Your PHP function is writing to the page already, rendering the document.write (javascript) useless. Try this:

<?php 
    function profileupdated() {
        return "<div id='profileupdated'>Profile updated</div>";
    } 
?>

I do want to note though that you might want to consider a cleaner way of doing this: If you just want to display a fixed text ("Profile updated"), stick to pure client-side Javascript.

Otherwise (if there's logic to be done server-side), you might want to decouple server and client and use an AJAX call and JSON to transfer your data.

answered Feb 9, 2015 at 17:49

Grüse

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Comments

Thomas · Accepted Answer · 2015-02-09 17:32:38Z

-1

PHP is a server side programming language, you are executing the JavaScript on the client side. If you want to call a PHP script from your JavaScript you need Ajax, f.e. jQuery.

answered Feb 9, 2015 at 17:32

Thomas

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