Pulling All Associated Rows MySQLi - php

Question

I have to pull from a table that's been made by someone else and print it onto a web page. Issue is, that column name are stored in the rows. For instance:
FIELD_NAME| FIELD_VALUE
______________________
first-name| John
last-name | Smith
This is how I'm going about grabbing the data
$tableRow = '';
$sql ="SELECT * FROM `wp_cf7dbplugin_submits` WHERE form_name = '".$nameOfForm."' ";
$result = $mysqli->query($sql);
while($tableData = $result->fetch_assoc()){
$fieldName = $tableData['field_name'];
$fieldValue = $tableData['field_value'];
//FIRST NAME
if($fieldName == 'first-name'){
$firstName = $fieldValue;
}
//LAST NAME
if($fieldName == 'last-name'){
$lastName = $fieldValue;
}
//BUILD A ROW FOR THE TABLE
$tableRow .='
<th>'.$firstName.'</th>
<th>'.$lastName.'</th>
';
}
it only KIND of works when I do $tableRow = instead of $tableRow .=
it will only show me one result, but when I do $tableRow .= it will only show me empty but the correct amount of s.
How can I populate an html table with all of the results pulling from a table like this?
EDIT:
I forgot to mention that the whole table looks like this:
<table id="theTable">
<thead>
<tr>
<th style="width:100px;">First Name</th>
<th style="width:100px;">Last Name</th>
</tr>
</thead>
<tbody id="rowsGoHere">
</tbody>
</table>
and I echo the PHP result via ajax,
//ECHO BACK RESULTS
$JSONData = array("true", $tableRow);
echo $_GET['callback']."(".json_encode($JSONData).")";
and use this to insert into table
var trueEncV = encodeURIComponent("true");
$.getJSON("pullTableData.php?callback=?",
{
trueV: trueEncV
},
function(dataBack){
alert(dataBack);
$('#rowsGoHere').html(dataBack[1]);
}
)
That all works fine and dandy.

Answer 1

According to your updated code the <tr> tags are missing. Also, within <tbody> you should use the <td> tag instead of the <th> tag.
$tableRow .='
<tr>
<td>'.$firstName.'</td>
<td>'.$lastName.'</td>
</tr>
';
Can you try
echo json_encode($JSONData);
instead of
echo $_GET['callback']."(".json_encode($JSONData).")";