[javascript] JavaScript, getting value of a td with id name

if i click table name its shown all fields about table. i did table field to show. but i need to know click function.

My Code:

$sql = "SHOW tables from database_name where tables_in_databasename not like '%tablename' and tables_in_databasename not like '%tablename%'";


$result=mysqli_query($cons,$sql);

$count = 0;

$array = array();

while ($row = mysqli_fetch_assoc($result)) {

    $count++;

    $tbody_txt .= '<tr>';

    foreach ($row as $key => $value) {
        if($count  == '1') {
            $thead_txt .='<td>'.$key.'</td>';
        }
        $tbody_txt .='<td>'.$value.'</td>';


        $array[$key][] = $value;
    }
}?>