How do I validate my form within PHP via JQuery Ajax call?

Question

How do I validate my code in PHP without getting error messages defined in the ajax definition in main.js?

Note: Chrome console returning: XMLHttpRequest cannot load file:///C:/Documents/Mini%20Revision%20Projects/Project%20Website%203/ajax.php. Received an invalid response. Origin 'null' is therefore not allowed access.

Below is my code:

main.html

<!DOCTYPE HTML>
<html>
    <head>  
        <script type="text/javascript" src="C:\Documents\jQuery\jquery2.js"></script>
    </head> 

    <body>

        <ul id="info1">
                <li>Put anything in the field below.</li>
        </ul>
        <form id="form1">
                <input type="text" name="field1" id="field1">
                <input type="submit" name="submit" id="submit" value="Submit Form">
        </form>

        <script type="text/javascript" src="main.js"></script>  

    </body>

</html>

main.js

$(document).ready(function() {

    $("#form1").submit(function( event ) {
        event.preventDefault();
        //alert("happy");
        $.ajax({
            type: 'POST',
            url: 'ajax.php',
            data: $(this).serialize(),
            dataType: 'json',
            success: function (data) {
                console.log(data);
                $("#info1").html(data.msg);
            },
            error: function (XMLHttpRequest, textStatus, errorThrown) {
                alert("Status: " + textStatus);
                alert("Error: " + errorThrown);
            }
        });
    });
});

ajax.php

<?php
    class ajaxValidate {

            function formValidate() {
                    //Put form elements into post variables (this is where you would sanitize your data)
                    $field1 = @$_POST['field1'];

                    //Establish values that will be returned via ajax
                    $return = array();
                    $return['msg'] = '';
                    $return['error'] = false;

                    //Begin form validation functionality
                    if (!isset($field1) || empty($field1)){
                            $return['error'] = true;
                            $return['msg'] .= '<li>Error: Field1 is empty.</li>';
                    }

                    //Begin form success functionality
                    if ($return['error'] === false){
                            $return['msg'] = '<li>Success Message</li>';
                    }

                    //Return json encoded results
                    return json_encode($return);
            }

    }

    $ajaxValidate = new ajaxValidate;
    echo $ajaxValidate->formValidate();
?>

are you at least using any LAMP ? from the chrome error - I'm guessing not... — LorDex
– LorDex, Commented Jun 18, 2014 at 15:52
@LorDex - I don't know what LAMP is unfortunately. I guess that answers the question :S. — GIVE-ME-CHICKEN
– GIVE-ME-CHICKEN, Commented Jun 18, 2014 at 15:54
you need to have PHP server in order to PHP scripts to work. install something like XAMPP (windows) or MAMP (linux) — LorDex
– LorDex, Commented Jun 18, 2014 at 15:58
@LorDex - I didn't have a PHP server. DOH! Put that as the answer please I will mark it. — GIVE-ME-CHICKEN
– GIVE-ME-CHICKEN, Commented Jul 7, 2014 at 16:42

Soanix · Accepted Answer · 2014-06-18 16:14:53Z

1

First of all, verify if PHP is not returning a warning or critical error. Insert this code in top of your code. If PHP returns a hidden error, the success data value will be null.

ini_set("display_errors", "On");
error_reporting(E_ALL);

PHP Error reporting manual

PHP run-time display_error

I think that if you are returning a JSON array in php, you need to call an array.

$("#info1").html(data['msg']);

Try to return the post values to verify if $_POST is not empty:

return json_encode($_POST);

You don't need to define an empty array if you define directly a first row.

//$return = array();
$return['msg'] = '';

answered Jun 18, 2014 at 16:14

Soanix

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LorDex · Accepted Answer · 2014-07-08 12:01:52Z

0

you need to have PHP server in order to PHP scripts to work. install something like XAMPP (windows) or MAMP (linux)

answered Jul 8, 2014 at 12:01

LorDex

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