calling a php function from a javascript script [duplicate]

Question

I have a file where I put all my needed functions. The one that I need is this one:

//the functions file
//........
function user_exists($username){
    $username = sanitize($username);
    $query = mysql_query("SELECT COUNT('user_id') FROM users WHERE username = '$username'");
    return (mysql_result($query, 0) == 1) ? true : false;
}
?>

I have included the functions file in my register.php file. What I want to do is call that function from javascript:

//the register file (functions file is included here)
<script>
 //.....
      if(user_exists(element.value)){  ........   }
 //.....
</script>

I think this can be solved with ajax but how to do it exactly since I'm not familiar with it?

Are you really asking for an AJAX tutorial? Or for someone to hand you the code? — user2625787
– user2625787, Commented Sep 26, 2013 at 15:44
i would really appreciate a help in code to understand what am i dealing with. — user2322972
– user2322972, Commented Sep 26, 2013 at 15:45
assign event,send ajax request to a service page,call this function on your service page,return the response and fetch it back.simple. — HIRA THAKUR
– HIRA THAKUR, Commented Sep 26, 2013 at 15:47

ow3n · Accepted Answer · 2013-09-26 15:52:07Z

0

You'll need to call the PHP function from within the PHP page and print the result. Then connect to it with Javascript/AJAX to get the plain text the PHP prints. Example from w3schools.

<script>
function loadXMLDoc(){
  var xmlhttp;
  var response;
  if (window.XMLHttpRequest){
    xmlhttp=new XMLHttpRequest();
  }
  xmlhttp.onreadystatechange=function(){
    if (xmlhttp.readyState==4 && xmlhttp.status==200){
      response=xmlhttp.responseXML;
      alert(response);
    }
  }
  xmlhttp.open("GET","register.php",true);
  xmlhttp.send();
}
</script>

answered Sep 26, 2013 at 15:52

ow3n

6,7774 gold badges61 silver badges57 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

calling a php function from a javascript script [duplicate]

1 Answer 1

Comments

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Linked

Related