Php and Javascript connection

Question

I'm very interested in if it is possible to connect javascript variables to php. I know that in php we can write javascript code, but on the contrary we could not. To express my aim better , lets bring example like that:

<form name="some" action="<?php $_SERVER['php_self']; ?>" method="post">
 <input type="submit" name="but" value="Action">
</form>

My question is how to make after pressing submit button to confirm (alert) with javascript and if it is confirmed do something (with php) and if isn't cancel (php operation).

You should be reading about AJAX...

nico
– nico

2011-12-28 15:20:34 +00:00
Commented Dec 28, 2011 at 15:20 — nico
– nico, Commented Dec 28, 2011 at 15:20

3 revs · Accepted Answer · 2011-12-28 15:32:49Z

1

You can do two things to pass javascript variable to php:

You can pass it as a hidden input field and submit it using POST

<input id="myHidden" name="myHidden" type="hidden"/>

Assign javascript variable to hidden input something like

var myVariable;

document.getElementById("myHidden").value = myVariable;
You can pass it as a query string with in your URL

As for confirming you can use javascript confirm, which will post on OK and not post/cancel on CANCEL

Something like:

<input type="submit" onclick="return confirm('Are you sure you want to submit?')"/>

edited Dec 28, 2011 at 15:32

community wiki

3 revs
Emmanuel N

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2 Comments

DaHaKa Over a year ago

Please bring some example with hidden input, I would be very pleasured :)

DaHaKa Over a year ago

Thanks for helping, I never thought to do that like u offered lol :)

symcbean · Accepted Answer · 2011-12-28 15:30:58Z

0

<form name="some" action="<?php $_SERVER['php_self']; ?>" method="POST"
 onsubmit="document.getElementById("response")
      = confirm('some question') ? 'yes' : 'no';
   return true;">
  <input type="hidden" name="response" id="response" value="">
  <input type="submit" name="but" value="Action">
</form>

BTW action="<?php $_SERVER['php_self']; ?>" opens up your page to XSS attacks.

answered Dec 28, 2011 at 15:30

symcbean

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2 Comments

DaHaKa Over a year ago

that means that it is better to use in action="fileName.php" yes ? And also in this example what role has the hidden type, please give me some explanation :)

symcbean Over a year ago

Yes, try it and see what gets posted

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