填充所需的三重选择帮助

Question

我有一个下拉列表，触发一个更改事件，该事件通过jquery和php填充第二个选择列表。 我需要做的是，在触发第一个事件时，用回调数据填充下拉列表2，还用下拉列表2的值填充下拉列表3。我需要查询2个表company_com和department，我可以使用JOIN执行此操作，但是不知道如何根据查询返回数据。

我已经发布了我当前正在使用的代码，将不胜感激，感谢您的帮助。 非常感谢。

jQuery更改事件代码

$(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代码

<?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代码

<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将页面重新提交到服务器，然后使用第一个选择框的值在查询中使用以填充接下来的两个选择框。

或者，您可以使用AJAX执行相同的操作而无需重新加载页面。 但随后您将不得不使用javascript来更改页面上的2个选择框。