How can i call one of many php functions with ajax? [duplicate] - php

Question

This question already has answers here:
Calling PHP file using AJAX
(3 answers)
Closed 8 years ago.
I have php website showing/hiding the pages through the nav links.
Im wondering how to call my php functions when clicking on the corresponding page link.
Is it possible to use ajax (jquery?) to call one of all the functions on my function.php file?As i understand it ajax will run the whole code in the php file its calling?
$(document).on("click", ".dbLink", function() {
var sText = $(this).attr("data-variable");
$.ajax({
url: '../ini/functions.php?q='+sText,
type: 'get',
success: function(data){
alert(data);
}
});
});
function.php
function a(){
echo "result";
}
if (isset($_POST['action'])) {
switch($_POST['action']) {
case "a":
a();
break;
case "b":
b();
break;
default:
break;
}
}

Answer 1

Put a string in the AJAX parameters, and have your PHP code run different functions depending on the string, e.g.
switch($_GET['op']) {
case "delete":
do_delete();
break;
case "update":
do_update();
break;
...
default:
// Report unrecognized operation
}
In your jQuery code, the handler function should call event.preventDefault or return false to prevent the normal action of the element you click on (I'm guessing it's a link). Also, you need to match the way you send the AJAX request with the way you retrieve the parameter in PHP -- if you use $_POST, you have to use type: 'post' -- and the parameter names must match (you used q in the Javascript, but action in the PHP).
$(document).on("click", ".dbLink", function(e) {
e.preventDefault();
var sText = $(this).attr("data-variable");
$.ajax({
url: '../ini/functions.php',
data: { action: sText }
type: 'post',
success: function(data){
alert(data);
}
});
});

Answer 2

You can do ajax request to server with your data in request parameters.
jQuery.ajax({
type: "POST",
url: 'your_functions_address.php',
dataType: 'json',
data: {functionname: 'add', arguments: [1, 2]},
success: function (obj, textstatus) {
if( !('error' in obj) ) {
yourVariable = obj.result;
}
else {
console.log(obj.error);
}
}
});
and your_functions_address.php like this:
<?php
$aResult = array();
if( !isset($_POST['functionname']) ) { $aResult['error'] = 'No function name!'; }
if( !isset($_POST['arguments']) ) { $aResult['error'] = 'No function arguments!'; }
if( !isset($aResult['error']) ) {
switch($_POST['functionname']) {
case 'add':
if( !is_array($_POST['arguments']) || (count($_POST['arguments']) < 2) ) {
$aResult['error'] = 'Error in arguments!';
}
else {
$aResult['result'] = add(floatval($_POST['arguments'][0]), floatval($_POST['arguments'][1]));
}
break;
default:
$aResult['error'] = 'Not found function '.$_POST['functionname'].'!';
break;
}
}
json_encode($aResult);
?>

Answer 3

You don't call functions from AJAX. With AJAX you retrieve resources.
PHP is a resource preprocessor (as every server-side language is), so it executes code to bring you the so-called resource (html pages, css, images, ... are resources).
So, AJAX does not issue functions, since AJAX is not related to PHP but to HTTP requests.
In that sense, the AJAX-side could understand that it must issue a resource (and it DOESN'T KNOW that resource will trigger a chunk of server-side logic).
So, what you could expect to do is to send arguments (e.g. via GET or POST) and expect a result. In the other (i.e. the PHP) side you should consider those arguments and process them.
Perhaps sending parameters like functionName=func1&params=[1,2,%22a%22] and processing them like:
$func = $_GET['functionName'];
$params = json_decode($_GET['params']);
if (function_exists($func))
{
$result = call_user_func_array($func, $params);
echo json_encode($result);
}
else
{
echo "unexistent function";
}
would do the job but, again, AJAX does not know about this, and never will, since AJAX is not related to PHP.