Php Ajax连接选择和总计记录查询

我有一个php页面，其中有一个ajax连接select和一个div，表tb1中有记录的总数

HTML

我的PHP课程

public function selYear() {


    $result = $this->db->mysqli->query
    ("SELECT year FROM tb1 WHERE model='$_POST[model]");        

    $year = '<option value="">Select</option>';

        while($row = $result->fetch_assoc()) {

            $year .= '<option value="' . $row['year'] . '"';
            $year .= '>' . $row['year'] . '</option>';
        }

    return $year;
}

private function recordNum(){

    $result = $this->db->mysqli->query
    ("SELECT * FROM tb1 WHERE something ");

        $numrec = $result->num_rows;

    return $numrec;
}

---

我的目标是在每次运行连接选择时使用ajax更新记录数。我怎么能这么做？谢谢

您应该在select-concat.php上使用json_encode返回两个结果

if(isset($_POST['model']))
{
    $years = $myclass->selYear();
    $total = $myclass->recordNum();

    $arr = array('years' => $years, 'total' => $total);

    echo json_encode($arr);

    die;
}

您必须将POST模型值添加到recordNum函数，或使用参数传递它

然后

$("select#model").change(function(){

    var model = $("select#model option:selected").prop("value");
            $("select#year").html(wait);


    $.post("ajax-php/select-concat.php", {model:model}, function(data){
        var json_data = $.parseJSON(data);

        switch (data) {

            case select:
                $("select#year").html("");
                $("#total").html(0);
            return false;

            default:
                $("select#year").prop("disabled", false);
                $("select#year").html(json_data.years);
                $("#total").html(json_data.total);
            return false;
        }
    });
});

---

是的，我知道，但是我想通过友好方式更新ajax记录编号。在选择更改时，我只重新加载SelectField，我还想更新记录编号。

public function selYear() {


    $result = $this->db->mysqli->query
    ("SELECT year FROM tb1 WHERE model='$_POST[model]");        

    $year = '<option value="">Select</option>';

        while($row = $result->fetch_assoc()) {

            $year .= '<option value="' . $row['year'] . '"';
            $year .= '>' . $row['year'] . '</option>';
        }

    return $year;
}

private function recordNum(){

    $result = $this->db->mysqli->query
    ("SELECT * FROM tb1 WHERE something ");

        $numrec = $result->num_rows;

    return $numrec;
}

if(isset($_POST['model']))
{
    $years = $myclass->selYear();
    $total = $myclass->recordNum();

    $arr = array('years' => $years, 'total' => $total);

    echo json_encode($arr);

    die;
}

$("select#model").change(function(){

    var model = $("select#model option:selected").prop("value");
            $("select#year").html(wait);


    $.post("ajax-php/select-concat.php", {model:model}, function(data){
        var json_data = $.parseJSON(data);

        switch (data) {

            case select:
                $("select#year").html("");
                $("#total").html(0);
            return false;

            default:
                $("select#year").prop("disabled", false);
                $("select#year").html(json_data.years);
                $("#total").html(json_data.total);
            return false;
        }
    });
});