使用Ajax时500内部服务器错误

Question

I am receiving a 500 internal server error when making an ajax call.

Here is the javascript/jquery that makes the call:

$.ajax({url: 'ServicesAjaxHandler.php',
        data: {action: 'add'},
        type: 'post',
        success: function(output) {
            alert(output);
        },
        error: function (xhr, ajaxOptions, thrownError) {
           alert(xhr.status);
           alert(xhr.responseText);
           alert(thrownError);
        }
    });

And here is the php file being called:

<?php

if(isset($_POST['action']) && !empty($_POST['action'])) {
    $action = $_POST['action'];
    switch($action) {
        case 'add' : add($_POST);break;
    }
}

public function add($data) {
    return 'test';
}
?>

xhr.responseText returns nothing.

Is there an issue with my PHP code that is causing this error?

Answer 1

Define your functions before using them, EG:

function add($data) {
    return 'test';
}

if(isset($_POST['action']) && !empty($_POST['action'])) {
    $action = $_POST['action'];
    switch($action) {
        case 'add' : add($_POST);break;
    }
}

Using the keyword public is for Object oriented applications, if you have a setup like this:

class Test_Class { 

    public function add($data) {
        return 'test';
    }

}

using the keyword public will be acceptable, but since you are not using objects for your function interaction, take away the keyword for a working set

Answer 2

Try changing public function to just function .

function add($data) {
    return 'test';
}