Call PHP function using javascript ajax

Question

I want call a PHP function using Javascript(No Jquery)

MY php function is

<?php

function helloworld() {
    echo 'Hello Ashish Srivastava';
}
?>

in hello.php file and my JavaScript is

 <script type="text/javascript">
            function getRoute() {
                var hr = new XMLHttpRequest();
                var url = "hello.php";

            hr.open("helloworld", url, true)
                hr.setRequestHeader("Content-type", "application/x-www-from-urlencoded");
                hr.onreadystatechange = function()
                {
                    if (hr.readyState === 4 && hr.status === 200)
                    {
                        var return_data = hr.responseText;
                        alert(return_data);

                    }
                }
                hr.send();
            }
        </script>

and HTMl is

  <input type="button" value="Hello" onclick="getRoute()"/>

bt when i am calling this function i get nothing from server plz help

because you are calling a page not function.to do that i think you need to have some MVC architecture. — Suchit kumar
– Suchit kumar, Commented Nov 29, 2014 at 5:37

marc_s · Accepted Answer · 2016-02-12 19:33:49Z

1

My advice would be to pass a query parameter.

Tell Javascript to use a url like

host.local/my-script.php?callFunction=helloWorld

and tell php to process the request object

<?php
    //fetch query parameter
    $callFunction = $_REQUEST['callFunction'];

    //define hello world function
    function helloWorld() {
        echo 'Hello Ashish Srivastava';
    }

    //test the query parameter and call helloWorld
    if($callFunction == "helloWorld")
       helloWorld();

edited Feb 12, 2016 at 19:33

marc_s

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answered Nov 29, 2014 at 5:40

Theodore Enderby

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Comments

Colin vH · Accepted Answer · 2014-11-29 05:32:52Z

1

AJAX doesn't call PHP functions, it calls pages. E.g., hello.php:

<?php
echo 'Hello Ashish Srivastava';
?>

answered Nov 29, 2014 at 5:32

Colin vH

5373 silver badges9 bronze badges

2 Comments

Ashish Srivastava Over a year ago

So is there any way of call function using ajax

Colin vH Over a year ago

You could have a page that calls the function, but there's no direct way to call PHP functions from JavaScript.

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