在相关选择中显示选项计数

Question

我想在选择框附近显示选项计数。以下代码显示了相关的选择框。 为了更清楚，我想按如下方式显示计数。

Province : 选择一个省份 (9) 区 : 选择一个区 (25)

如果选择了一个省份，则必须显示所选省份下的地区数量，并且必须显示地区名称作为选择选项。

下面是javascript代码

$('.act').change(function(){
      if($(this).val() != '')
      {
       var action = $(this).attr("id");
       var query = $(this).val();
       var result = '';
       if(action == "province")
       {
        result = 'district';
       }
       else if(action == "district")
       {
        result = 'ds';
       } 
       else if(action == "ds")
       {
        result = 'gn_div';
       }

       else if(action == "gn_div")
       {
        result = 'village';
       }
       $.ajax({
        url:"views/fetch.php",
        method:"POST",
        data:{action:action, query:query},
        success:function(data){
         $('#'+result).html(data);
        }
       })
    }
});

以下php代码用于获取所需记录

<?php
//fetch.php

require ('../config/dbconnection.php');

$a=0;

if(isset($_POST["action"]))
{

 $output = '';
 $count = '';
 if($_POST["action"] == "province")
 {
  $query = "SELECT * FROM `district` WHERE province_id= '".$_POST["query"]."' AND approved='1'";
 // echo $query;
  $result = mysqli_query($conn, $query);
  $output .= '<option value="">Select a District</option>';
  while($row = mysqli_fetch_array($result))
  {
    $output .= '<option value="'.$row["id"].'">'.$row["district_code"].': '.$row['name_english'].'</option>';
}
 }
 if($_POST["action"] == "district")
 {
  $query = "SELECT * FROM `divisional_secretariat` WHERE district_id = '".$_POST["query"]."' AND approved='1'";
  $result = mysqli_query($conn, $query);
  $output .= '<option value="">Select a Divisional Secretariat</option>';
  while($row = mysqli_fetch_array($result))
  {

   $output .= '<option value="'.$row["id"].'">'.$row["divisional_secretariat_code"].': '.$row['name_english'].'</option>';
  }
 }

 if($_POST["action"] == "ds")
 {
  $query = "SELECT * FROM `grama_niladhari_division` WHERE divisional_secretariat_id = '".$_POST["query"]."' AND approved='1'";
  $result = mysqli_query($conn, $query);
  $output .= '<option value="">Select a Grama Niladhari Division</option>';
  while($row = mysqli_fetch_array($result))
  {
   $output .= '<option value="'.$row["id"].'">'.$row["grama_niladhari_division_code"].': '.$row['name_english'].'</option>';
  }
 }

  if($_POST["action"] == "gn_div")
 {
  $query = "SELECT * FROM `village` WHERE grama_niladhari_division_id = '".$_POST["query"]."' AND approved='1'";
  $result = mysqli_query($conn, $query);
  $output .= '<option value="">Select a Village</option>';
  while($row = mysqli_fetch_array($result))
  {
   $output .= '<option value="'.$row["id"].'">'.$row["village_code"].': '.$row['name_english'].'</option>';
  }
 }
 echo $output;

}
?>

Answer 1

您可以使用mysqli_num_rows 获取结果集中的行数。然后返回输出和行数。

<?php

require ('../config/dbconnection.php');

$a = 0;

if (isset($_POST['action'])) {
    $output = '';
    $count = 0;

    if ($_POST['action'] === 'province') {
        $query = "SELECT * FROM `district` WHERE province_id = '{$_POST['query']}' AND approved = '1'";

        $output = '<option value="">Select a District</option>';

        $result = mysqli_query($conn, $query);

        while($row = mysqli_fetch_array($result)) {
            $output .= '<option value="' . $row['id'] . '">' . $row['district_code'] . ': ' . $row['name_english'] . '</option>';
        }
    } elseif ($_POST['action'] === 'district') {
        $query = "SELECT * FROM `divisional_secretariat` WHERE district_id = '{$_POST['query']}' AND approved='1'";

        $output = '<option value="">Select a Divisional Secretariat</option>';

        $result = mysqli_query($conn, $query);

        while($row = mysqli_fetch_array($result)) {
            $output .= '<option value="' . $row['id'] . '">' . $row['divisional_secretariat_code'] . ': ' . $row['name_english'] . '</option>';
        }
    } elseif ($_POST['action'] === 'ds') {
        $query = "SELECT * FROM `grama_niladhari_division` WHERE divisional_secretariat_id = '{$_POST['query']}' AND approved='1'";

        $output = '<option value="">Select a Grama Niladhari Division</option>';

        $result = mysqli_query($conn, $query);

        while($row = mysqli_fetch_array($result)) {
            $output .= '<option value="' . $row['id'] . '">' . $row['grama_niladhari_division_code'] . ': ' . $row['name_english'] . '</option>';
        }
    } elseif ($_POST['action'] === 'gn_div') {
        $query = "SELECT * FROM `village` WHERE grama_niladhari_division_id = '{$_POST['query']}' AND approved='1'";

        $output = '<option value="">Select a Village</option>';

        $result = mysqli_query($conn, $query);

        while($row = mysqli_fetch_array($result)) {
            $output .= '<option value="' . $row['id'] . '">' . $row['village_code'] . ': ' . $row['name_english'] . '</option>';
        }
    }

    $count = mysqli_num_rows($result);

    echo json_encode([
        'output' => $output,
        'count' => $count
    ]);
}

您应该在 Javascript 中获得 json 响应：

$('.act').change(function() {
    if ($(this).val() != '') {
        var action = $(this).attr('id');
        var query = $(this).val();
        var result = '';

        if (action === 'province') {
            result = 'district';
        } else if (action === 'district') {
            result = 'ds';
        } else if (action === 'ds') {
            result = 'gn_div';
        } else if (action === 'gn_div') {
            result = 'village';
        }

        $.ajax({
            url: 'views/fetch.php',
            method: 'POST',
            contentType: 'application/json;charset=utf-8',
            data: {action:action, query:query},
            success: function(data) {
                data = JSON.parse(data);
                $('#' + result).html(data.output);

                /* Use data.count to get number of results returned */
            }
        });
    }
});

别忘了使用Prepared Statements。