Question

I am trying to fetch a PHP script using AJAX and return the values as JSON. For some reason, my script fails and I am trying to figure out the problem. When I enter a value from the database into the address bar, like:

www.someaddress/post.php?kinaseEntry=aValue

I get a JSON output like so:

{"kinaseSKU":null,"url":null,"molecularWeight":null,"tracerSKU":null,"antiSKU1":"antiSKU1","antiSKU2":"antiSKU2","bufferSKU":"bufferSKU","tracerConc":null,"assayConc":null}

My PHP file looks like so:

<?php

//Include connection to database
require_once 'connect.php';

$kinase = mysql_real_escape_string ($_POST["kinaseEntry"]);

mysql_query('SET CHARACTER SET utf8'); 

$findKinase = "SELECT * FROM kbaData where cleanSKU = '" .$kinase. "' ";

if ($result = mysql_query($findKinase)) {

    $row = mysql_fetch_array($result, MYSQL_ASSOC);

    $kinaseSKU = $row['cleanSKU'];
    $url = $row['url'];
    $molecularWeight = $row['molecularWeight'];
    $tracerSKU = $row['tracerSKU'];
    $antiSKU1 = $row['antiSKU1'];
    $antiSKU2 = $row['antiSKU2'];
    $bufferSKU = $row['bufferSKU'];
    $tracerConc = $row['tracerConc'];
    $assayConc = $row['assayConc'];


    /* JSON ROW */
    $json = array ("kinaseSKU" => $kinaseSKU, "url" => $url, "molecularWeight" => $molecularWeight, "tracerSKU" => $tracerSKU, "antiSKU1" => $antiSKU1, "antiSKU2" => $antiSKU2, "bufferSKU" => $bufferSKU, "tracerConc" => $tracerConc, "assayConc" => $assayConc );

} else  {

    /* CATCH ANY ERRORS */
    $json = array('error' => 'Mysql Query Error');
}

/* SEND AS JSON */
header("Content-Type: application/json", true);

/* RETURN JSON */
echo json_encode($json);

/* STOP SCRIPT */
exit;
?>

Am I going about this the wrong way? Or have I done this wrong?

EDIT: Here is my jQuery/Ajax that calls the PHP script:

$(document).ready(function()    {

$('#kinaseEntry').change(function ()    {

    var kinaseEntry = $('#kinaseEntry').val();
    var dataString = 'kinaseEntry' + kinaseEntry;

    $('#waiting').show(500);
    $('#message').hide(0);
    alert(kinaseEntry);

    //Fetch list from database
    $.ajax({
        type : "POST",
        url : "post.php",
        datatype: "json",
        data:   dataString,
        success : function(datas)   {
            alert("datas" + datas);
        },
        error : function(error) {
            alert("Oops, there was an error!");
        }
    });
    return false;
});
});

Answer 1

First I am not sure if if (isset($_POST['kinaseEntry'])) will work for what you have shown. The URL you have shown is a get request, so if you want access to that variable you will have to use $_GET['kinaseEntry']. If you need to do POST change the method attribute in your form to <form method="POST"> that will give you the post variable.