Select table row contents

Do you speak well?

I have an HTML application, PHP, Jquery, bootstrap and on the same screen I have two tables the first of clients I bring via AJAX when I type the client name in the "search" field, this returns me a table with name, cpf and a "select customer" button, this button select client when it is generated by "while" I already enter in your attribute "value" the client id for when I select it know who I am talking about. but when I select the client in the list, it has "value" as undefined, I need to select the client and then in the second table on the same screen, select only the products purchased by him by filtering through his ID.

I thought of doing this as here Get value or name of the button with JQuery

AJAX:

function CriaRequest() {
 try{
     request = new XMLHttpRequest();        
 }catch (IEAtual){

     try{
         request = new ActiveXObject("Msxml2.XMLHTTP");       
     }catch(IEAntigo){

         try{
             request = new ActiveXObject("Microsoft.XMLHTTP");          
         }catch(falha){
             request = false;
         }
     }
 }

 if (!request) 
     alert("Seu Navegador não suporta Ajax!");
 else
     return request;
}



function getDadosCliente() {

 var nome   = document.getElementById("buscarcliente").value;
 var result = document.getElementById("ResultadoCliente");
 var xmlreq = CriaRequest();

 result.innerHTML = '<img src="../img/loading.gif"/>';

 xmlreq.open("GET", "buscarcliente.php?buscarcliente=" + nome, true);

 xmlreq.onreadystatechange = function(){

     if (xmlreq.readyState == 4) {

         if (xmlreq.status == 200) {
             result.innerHTML = xmlreq.responseText;
         }else{
             result.innerHTML = "Erro: " + xmlreq.statusText;
         }
     }
 };
 xmlreq.send(null);
 }

findclient.php (what AJAX calls):

<?php


if (isset($_GET["buscarcliente"])) {
$nome = $_GET["buscarcliente"];
if (empty($nome)) {
    $query = ("SELECT * FROM clientes");
} else {
    $nome .= "%";
    $query = ("SELECT * FROM clientes WHERE nomeCliente LIKE '$nome'");
}
sleep(1);

    $dados = mysqli_query($conecta,$query);
    // transforma os dados em um array
    $linha = mysqli_fetch_assoc($dados);
    // calcula quantos dados retornaram
    $total = mysqli_num_rows($dados);
    $cont = mysqli_affected_rows($conecta);


 if($cont > 0) {


    $tabela = "<table class='table table-striped table-bordered table-hover'>
                <thead>
                    <tr>
                        <th class='text-center info'>NOME</th>
                        <th class='text-center info'>CPF/CNPJ</th>
                        <th class='text-center info'>AÇÃO</th>
                    </tr>
                </thead>
                <tbody>
                <tr>";
    $return = "$tabela";
     do{
        $return.= "<td>" . utf8_encode($linha['nomeCliente']) . "</td>";
        $return.= "<td>" . utf8_encode($linha['cpfcnpj']) . "</td>";
        $return.= "<td class='text-center'><a onclick='selecaoCliente()' class='btn btn-success btn-sm' value=".$linha['idCliente']."><span class='glyphicon glyphicon-ok'></span></a></td>";
        $return.= "</tr>";
    }        while ($linha = mysqli_fetch_assoc($dados)) ;

    echo $return.="</tbody></table>";
} else {
    echo "Não foram encontrados registros!";
}
}


 ?>

In HTML I only have the input fetch, the result div, the textarea, and the second fetch field with the second result div.