textbox onchange call php function

Question

How can i call a PHP function from onchange on an HTML form textbox? I have tried

<input onchange="phpfunction()" ..... >

<?php
    function phpfunction() {
        my function
    }
?>

Any Help? I Can't seem to figure it out.

Thank You

Answer 1

You have to do an ajax call and post that your PHP.

Example:

HTML:

<input name="blah" onchange="mainInfo(this.value);">

Javascript Function (AjaX)

function mainInfo(id) {
    $.ajax({
        type: "GET",
        url: "dummy.php",
        data: "mainid =" + id,
        success: function(result) {
            $("#somewhere").html(result);
        }
    });
};

PHP

<?php
    if(isset($_GET['mainid'])){
        mainInfo($_GET['mainid']);
    }
?>