How to use my PHP function in JavaScript code

Question

I'm trying to use my PHP function in JavaScript like this:

PHP code:

function checkevents($date){
    $ev = new CalendarModelEventss();
    $wh = "`event_date` = '".$date."'";
    $all = $ev->getAllEvents('event_date', $wh);
    if($all == $date){
        //echo 'event is available'.$all;   
        return true;
    } else {
        return false;
        //echo 'event is NOT available' .'--'. $all;
    }
}

and JavaScript code:

var yyyy = date.getLocalFullYear(true, this.dateType);
var mm = date.getLocalMonth(true,this.dateType);
var dd = iday;
var ddddd = yyyy+'/'+mm+'/'+dd;

if(<?php checkevents( ?>ddddd<?php ) ?>){
     cell.className += " eventsss ";
}

but it doesn't work, and I have PHP error (syntax error, unexpected ';', expecting ')' in ...).

Basically understanding technologies you are trying to use helps. So maybe checking what "server side" and "client side" terms mean, would solve your doubts too? — Marcin Orlowski, Dec 08 '12 at 12:42
If you;re so particular about using php for the validation, you need to send the data to server and validate using AJAX. — saji89, Dec 08 '12 at 12:49
This link http://stackoverflow.com/questions/7165395/call-php-function-from-javascript might help you. — Praveen Kumar, Dec 08 '12 at 12:55
This link http://stackoverflow.com/questions/7165395/call-php-function-from-javascript might help you. — Praveen Kumar, Dec 08 '12 at 12:56

Niclas Larsson · Answer 1 · 2012-12-08T12:54:02.777

As the previous speaker said, it's impossible to directly call php functions from javascript. PHP could be used to output javascript though.

In your case you would need to send an ajax-request from the client side (with javascript) that executes the php code (on the server side), fetches the output and puts it into your if-statement.

If you do not know alot about javascript/AJAX you could take a look at jQuery or another similar framework.

Florian Kasper · Answer 2 · 2012-12-08T12:58:24.547

2

Javascript is parsed on client side and PHP on Server side.
Without AJAX this is impossible.

Example with JQuery:

PHP:

...
    echo "true";//or something else that indicates the success
} else {
    echo "false";//or something else that indicates the failure
}
...

Javascript:

$.ajax({
  url: "URL TO YOU PHP SCRIPT",
  cache: false
}).done(function( html ) {
  if(html.match(/true/g)){
     cell.className += " eventsss ";
  }
});

edited Dec 08 '12 at 12:58

answered Dec 08 '12 at 12:42

Florian Kasper

496
3
8

More like: without sending a request to the server it would be impossible. You could use techniques like JSONP or even websocket to trigger a server-side php. – Niclas Larsson Dec 08 '12 at 12:53
Thank you, but i wanna use in for statement, Is not a problem to use ajax? – Mahtab Darvishi Dec 08 '12 at 13:05
you can use .match(/true/g) as I wrote above. It looks for the "true" word in the response and returns true or false so you can work with it – Florian Kasper Dec 08 '12 at 13:36

score 0 · Answer 3 · answered Dec 08 '12 at 12:58

You cannot directly call php function using javascript directly as both of them are on different sides.So what you do is make an AJAX call with certain parameters and after that call that php function directly from that php file with the parameters to be validated.

And Send back the output back to javascript by echoing the output and do whatever with it on javascript.

How to use my PHP function in JavaScript code

3 Answers3