MekLeN MekLeN - 1 year ago 63
PHP Question

Form to Ajax to PHP for Insert into SQL

I have tried very hard to get a simple working model of this to function. My actual Site is larger, but I've dumbed down the scripting to make things simple (and troubleshoot).

I keep getting "500" errors when I click to send the Form through, and I've been unable to figure out what I've been doing wrong.
(I've set up a simple database to capture just this one item).

(The PHP file is named "sample2.php" within the same directory as html is in.)

A screenshot of my database:

database screenshot

My HTML File:

<meta charset="utf-8">
<script src="//"></script>
<div name="maindiv" id="maindiv">
<span>sample1:</span> <input id="sample1" name="sample1" width="300px" type="text" value="sample1text" /><br />

<input type="button" name="sendit" value="Do it" id="sendit"/>

<script language="javascript" type="text/javascript">

$("#sendit").on("click", function() {
var fieldvalue = [];

$('#maindiv input').each(function() {
fieldvalue.push([, $(this).val()]);


url: "sample2.php",
type: "POST",
dataType: "json",
data: JSON.stringify(fieldvalue),
success: function() {

and my PHP file:

$pdo = new PDO("mysql:dbname=trialdb;","username","password");

$id = $_POST['sample1'];

$query->bindValue(':sample1', $sample1, PDO::PARAM_STR);
$sql = "INSERT INTO sampletable (sampleline) VALUES (:sample1);";

$query = $pdo->prepare($sql);

if($statment = $pdo->prepare($sql)) {

Answer Source

Your PHP seems to be mixed up. For simplicity, try just doing this:

$pdo = new PDO(";dbname=trialdb","username","password");

if(isset($_POST['sample1'])) {
    $sql = "INSERT INTO `sampletable` (`sampleline`) VALUES (:sample1)";
    $query = $pdo->prepare($sql);
    # I find binding values much easier just doing the array into the execute
    # If you get it working like this and really want to go back and try
    # bindValue(), you can

This is as basic as it gets. If you can get this to work, then you just kind of build off of it. You may want to try/catch PDOExceptions if you want to troubleshoot any unforeseen sql errors.

For testing pursposes, I would be tempted to not send json, that way you can more-easily troubleshoot your php from the console.log():

    $("#sendit").on("click", function() {
        // If you are not serializing, I would do an object, not array
        var fieldvalue = {"action":"submit"};
        // Loop through and save names and values
        $('#maindiv input').each(function(k,v) { 
            fieldvalue[$(v).attr('name')] = $(v).val();

            url: "sample2.php",
            type: "POST",
            // Try just sending array here
            data: fieldvalue,
            // On the success, add the response so you can see
            // what you get back from the page
            success: function(response) {
                // Do a check to see if you get any errors back
                // This has minimal value because it is only telling you
                // that the ajax worked. It's not telling you anything from the
                // response of the page
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