php，mysql，jquery，表單元素鏈選擇

Question

我在使用鏈接（表單元素）選擇時遇到了麻煩。 我似乎無法使用jquery觸發要使用$ examplevar作為第一個下拉列表中選擇的選項生成的過濾器進行選擇的第二個選擇選項。

    <form name="vlan" action="" method="post"> 
      <div class="row">
        <div class="col-md-6">
        <?php
        $con_string= "host=example port=xxxx dbname=example user=example password=example";
        $db_con = pg_connect($con_string);
        $dev = pg_query($db_con, "SELECT DISTINCT \"Type\" FROM \"End_Devices\"");

                            echo "  
                            <a class=\"current_page_item\">Location NASID:</a>
                            <input type=\"text\" name=\"nasid\" />      
                            <br>
                            <a class=\"current_page_item\">Device Name:</a>
                            <input type=\"text\" name=\"name\" />   
                            <br>
                            <input type=\"hidden\" name=\"dvtype\"/>
                            <a class=\"current_page_item\">Device Type:</a> 
                            <select name=\"slType\" id=\"slType\">";

                            while ($device = pg_fetch_array($dev))
                            {
                                echo "<option id=\"" .$device['Type'].  "\">" .$device['Type']. "</option>";

                            }
                            echo "<script type=\"text/javascript\">

                                $(\"#slType\").chained(\"#slModel\");
                                $(\"#slType\").on(\"change\",function(){
                                    var slTypeID = $(this).val();
                                    $.post('inventoryTEST.php', {slTypeID:slTypeID}, function(data){
                                        $('#slModel').html(data);
                                    });
                                });

                            </script>";


                            echo "
                            </select>
                            <br>
                            <a class=\"current_page_item\">Device Model:</a>
                            <select  name=\"slModel\" id=\"slModel\" >";

                            if (isset($_POST['slTypeid']))
                            {
                                $selection = ($_POST(['slTypeid']));

                            }

                            $mod = pg_query($db_con, "SELECT \"Model\" FROM \"End_Devices\" WHERE \"Type\"=\"". $selection . "\"");
                            while ($model = pg_fetch_array($mod))
                            {
                                echo $_POST[type];
                                echo "<option id=\"" .$model['Model'].  "\">" .$model['Model']. "</option>";
                            }
                            echo "
                            </select>
                            <br>
                            <a class=\"current_page_item\">Physical Location:</a>
                            <input type=\"text\" name=\"location\" />
                            <br>
                            <a class=\"current_page_item\">Serial:</a>
                            <input type=\"text\" name=\"serial\" /> 
                            <br>
                            <a class=\"current_page_item\">IP Address:</a>
                            <input type=\"text\" name=\"ip\" />
                            <br>
                            <a class=\"current_page_item\">MAC:</a>
                            <input type=\"text\" name=\"mac\" />    
                            <br>
                            <a class=\"current_page_item\">SSID:</a>
                            <input type=\"text\" name=\"ssid\" />
                            <br>
                            <a class=\"current_page_item\">WLAN Area:</a>
                            <input type=\"text\" name=\"wlan\" />   
                            <br>
                            <br>
                            <br>
                        ";
                        ?>
                            <!--SUBMIT INPUT-->
                            <input type="submit" value="Save" name="submit" />
                        </div>
                    </div>
                </form>

任何人都可以對上面的代碼提出建議嗎？ 我無法觸發on change事件來填充用作sql查詢過濾器的var，然后填充第二個鏈接的下拉列表。 致以最誠摯的問候，

Answer 1

通過使用jquery和.ajax來解決此問題，方法是將選定的行內容.change與post一起傳遞到外部php，然后在其中查詢db，將其用作過濾器並填充第二個組合框。