Calling PHP function and passing JavaScript variables

Question

I was trying to build web application where user clicks a button and it prompts them to enter email address using JavaScript prompt functionality like this.

function mail_me(x)
{
        var person = prompt('Please enter your email Address','[email protected]');

}

than I want to call PHP function inside my JavaScript and pass person as parameter of that PHP function. Is it possible to do it. I have tried this so far.

function mail_me(x)
{
        var person=prompt('Please enter your email Address','[email protected]');
            alert('<?php mail_tome('person'); ?>');
}

In this specific case you can use an echo ("<script> alert('" . mail_tome('person') . "')</script>"); .. but this is a workaround the best way is to use AJAX — Lefsler
– Lefsler, Commented Jun 4, 2013 at 19:08
Do not forget that php will generate an HTML and will return it to the client. PHP is processed on the server and the final information is returned to the client. — Lefsler
– Lefsler, Commented Jun 4, 2013 at 19:10

Phil Cross · Accepted Answer · 2013-06-04 19:04:49Z

4

Its not possible, PHP is processed on the server, while Javascript is rendered on the client side after the server has completed it works.

You would need to use Ajax to take the value of person, and pass it via ajax back to a php script on the server which would then process your request.

http://api.jquery.com/jQuery.ajax/

answered Jun 4, 2013 at 19:04

Phil Cross

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3 Comments

Niet the Dark Absol Over a year ago

vanilla-js.com contains an AJAX example that is many times more efficient than jQuery's.

Phil Cross Over a year ago

@Kolink I'll have to give that a read over. Sounds interesting.

addiedx44 Over a year ago

@PhilCross It's literally just vanilla Javascript.

Niet the Dark Absol · Accepted Answer · 2013-06-04 19:09:11Z

1

Such a thing is impossible. PHP is executed on the server, and the result is passed to the browser.

You can, however, use AJAX to send the variable to the server. Example:

var a = new XMLHttpRequest();
a.open("POST","/path/to/script.php",true);
a.onreadystatechange = function() {
    if( this.readyState != 4) return;
    if( this.status != 200) return alert("ERROR "+this.status+" "+this.statusText);
    alert(this.responseText);
};
a.send("email="+person);

This will cause whatever the PHP script echos to the browser to appear in the alert. Of course, you can customise this as much as you like, this is just a basic example.

answered Jun 4, 2013 at 19:09

Niet the Dark Absol

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Comments

GGio · Accepted Answer · 2013-06-04 19:05:49Z

0

You need something that is called AJAX. If you know and using JQuery it has built in functionality for AJAX.

Example:

function mail_me() {
  var person = prompt('Please enter your email Address','[email protected]');
  $.ajax({
    type: 'post',
    url: URL TO YOUR SCRIPT,
    data: {
       email: EMAIL_VARIABLE
    },
    success: function(result) {
        //handle success
    }
  });
}

answered Jun 4, 2013 at 19:05

GGio

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3 Comments

Niet the Dark Absol Over a year ago

Do you see a jQuery tag anywhere?

GGio Over a year ago

thats why in my answer I state that if he is using JQuery it would be easier to just use its built in functionality

Niet the Dark Absol Over a year ago

Erm... In my project, it's as easy as ajax("somepage",{key:"value",key2:"value2"},function(r) {alert("Do something!");});. Much easier than your jQuery. It's called DIY functions.

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