填充所需的三重選擇幫助

Question

我有一個下拉列表，觸發一個更改事件，該事件通過jquery和php填充第二個選擇列表。 我需要做的是，在觸發第一個事件時，用回調數據填充下拉列表2，還用下拉列表2的值填充下拉列表3。我需要查詢2個表company_com和department，我可以使用JOIN執行此操作，但是不知道如何根據查詢返回數據。

我已經發布了我當前正在使用的代碼，將不勝感激，感謝您的幫助。 非常感謝。

jQuery更改事件代碼

$(function() {
  $("#dstr_dept").change(function() {
    $(this).after('<div id="loader"><imgages src="img/loading.gif" alt="loading files" /></div>');
    $.get('loadboxDstrsubcat.php?dstrdept=' + $(this).val(), function(data) {
      $("#box_dstr").html(data);
      $('#loader').slideUp(200, function() {
        $(this).remove();
        $("#box_dstr").trigger("chosen:updated"); 
      });
    });
  });
});

PHP代碼

<?php
 session_start();
?>

<?php
    include('../Connections/domain.php');

    $dstrdept = $_GET['cltdstrdept'];
    $customer = $_SESSION['kt_idcode_usr'];

    mysql_select_db($database_domain, $domain);
    $query = "SELECT name FROM departments WHERE code = '".$dstrdept."' ORDER BY name ASC";
    $result = mysql_query($query) or die (mysql_error());

    if (mysql_num_rows($result) > 0) {

    echo "<script type=text/javascript>\n";
    echo "$(function() {\n";
    echo "$(\".noBdstrBoxes\").html('')\n";
    echo "$('#dstr_dept').attr('data-placeholder', \"Choose your dept...\").prop('disabled', false)\n";
    //echo "$(\"#box_dstr\").prop('disabled', false)\n";
    //echo "$('#Frtv').show()\n";
    echo "});\n";
    echo "</script>\n";

    // This returns the data of departments
    while($row = mysql_fetch_array($result)) {
    echo "<option value='$row[name]'>$row[name]</option>";
    }    

    } else {

    echo "<script type=text/javascript>\n";
    echo "$(function() {\n";
    echo "$('.noBdstrBoxes').html('ERROR: There are no boxes to destroy in that dept. Please select another.').css({\"color\":\"red\", \"margin\": \"-6px 0 10px 22px\", \"font-size\": \"12px\", \"font-family\": \"Verdana, Geneva, sans-serif\"})\n";
    echo "$('#box_dstr').attr('data-placeholder', \"No boxes to display...\").prop('disabled', true)\n";
    echo "});\n";
    echo "</script>\n";

    //echo "<option value='No boxes in that dept'>No boxes in that dept</option>";

    }
?>

HTML代碼

<div class="fieldset">
          <h1><span>Select a Customer</span></h1>
          <p>
            <select data-placeholder="Choose a customer..." class="chosen-select" style="width:250px;" name="dstr_customer" id="dstr_customer">
              <option value=""></option>
                <option value="DEMO">DEMO</option>
                <option value="DEMO2">DEMO2</option>
                <option value="DEMO3">DEMO2</option>
                <option value="DEMO4">DEMO2</option>
            </select>
            <span></span>
            <a href="javascript:void(0)" style="margin-left:10px;" class="tooltip" title="Please select a dept where the box to be destroyed is stored.">Help</a>
          </p>
        </div>

<div class="fieldset">
          <h1><span>Select a Department</span></h1>
          <p>
            <select data-placeholder="Choose a dept..." class="chosen-select" style="width:250px;" name="dstr_dept" id="dstr_dept">
              <option value=""></option>

            </select>
            <span></span>
            <a href="javascript:void(0)" style="margin-left:10px;" class="tooltip" title="Please select a dept where the box to be destroyed is stored.">Help</a>
          </p>
        </div>

<div class="fieldset">
          <h1><span>Select an Address</span></h1>
          <p>
            <select data-placeholder="Choose an address..." class="chosen-select" style="width:250px;" name="dstr_address" id="dstr_address">
              <option value=""></option>

            </select>
            <span></span>
          </p>
        </div>

<div class="fieldset">
          <h1><span>Select Your Box(es)</span></h1>
          <p>
            <select data-placeholder="Choose your box(es)..." class="chosen-select" name="box_dstr[]" id="box_dstr" multiple required="required">
              <option value=""></option>
            </select>
            <span></span>
            <a style="margin-left: 12px;" href="javascript:void(0)" class="tooltip" title="Please select your boxes from the list. You can select a max of 20 boxes per submission.<br />.<br />You can select multiple boxes by holding the left ctrl on your keyboard and making your selection">Help</a>
          </p>
          <div class="noBdstrBoxes"></div>
        </div>

Answer 1

您可以使用php將頁面重新提交到服務器，然后使用第一個選擇框的值在查詢中使用以填充接下來的兩個選擇框。

或者，您可以使用AJAX執行相同的操作而無需重新加載頁面。 但隨后您將不得不使用javascript來更改頁面上的2個選擇框。