Second-level linkage Third-level linkage Fourth-level linkage Multi-level linkage

php thinkphp realizes second-level linkage, third-level linkage, fourth-level linkage, multi-level linkage, attachment with database and selection.
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Page: <script type="text/javascript" src="js/jquery-1.8.3.min.js"></script><br> <!-- If you do not want to keep the selected state, you can remove the contents of the <if></if> tag --><br> <!-- Each choice is a level one. You can have only two choices, which is a level two linkage, three is a level three linkage, four is a level four linkage, and so on. I made a level four linkage and a level two linkage. Normal --><br> <br> <!-- Region --><br> <div class="form-group"> <br> <label class="col-sm-2">Laboratory region</label><br> <div class="btn-group" style="margin-bottom: 20px;"> <br> <select name="region1_id" id="region_0_0" onchange="setregion(0,0)" class="form-control" style="display:inline; width:auto;"><br>             <option name="selected" selected value="-1">City</option> <br>           <volist name="list" id="vo"><br> <option value="{$vo['id']}" condition="$row['region1_id'] eq $vo['id']">selected='selected' >{$vo['title']}</option> <br>                                                                                         </volist></select><br> <select name="region2_id" id="region_1_0" onchange="setregion(1,0)" class="form-control" style="display:inline; width:auto;"><br>             <option name="selected" selected value="-1">School</option> <br>                                                                                                                                                                                                   ?            <if condition="$row['region2_id'] neq NULL"><br>                                                                                                    $region2 = D('LabTypeRegion')->where(array('id'=>$row['region2_id']))->getField('title');<br>                                                                                                             <option value="{$row['region2_id']}" selected style="display:none;">{$region2}</option> <br>                                                                                                                                                                                                                                                                                       ? </if></select><br> <select name="region3_id" id="region_2_0" onchange="setregion(2,0)" class="form-control" style="display:inline; width:auto;"><br>            <option name="selected" selected value="-1">College</option> <br>                                                                                                                                                                                                   ?            <if condition="$row['region3_id'] neq NULL"><br>                                                                                                    $region3 = D('LabTypeRegion')->where(array('id'=>$row['region3_id']))->getField('title');<br>                                                                                                         <option>{$region3}</option> <br>         </if><br>         <!-- 保持上回选中 --><br>     </select><br>     <select><br>         <option>实验室</option> <br>         <!-- 保持上回选中 --><br>         <if><br>           <php><br>               $region4 = D('LabTypeRegion')->where(array('id'=>$row['region4_id']))->getField('title');<br>           </php><br>           <option>{$region4}</option> <br>         </if><br>         <!-- 保持上回选中 --><br> <br>     </select><br>   </div> <br> </div> <br> <script type="text/javascript">//Set the default and restore the default option when the page is loaded. <br /> Function region_default() {<br />          $("option[value='-1']").attr('selected', 'selected');<br /> }<br /> Function setregion(num, address_id) {<br />       var next = num + 1;<br />           $.ajax({<br />            type: 'POST',<br />                     //Set the json format and receive the returned array. <br /> DataType: 'json',<br />    url: '',<br /> ​​​​​​ //ajax passes the value of the current option, which is the current region_id. <br /> data: 'region_id=' + $('#region_' + num + '_' + address_id).val(),<br /> Success: function(msg) {<br />                          // Execute if the return value is not empty. <br /> If (msg != null) {<br />                                                                                                                                                                                                                                                  // Loop to write the content to be added to the next select. and add name tag. <br /> for (var i = 0; i < msg.length; i++) {<br />                  option_str+='<option name="region_'+next+'"value="'+msg[i].id+'">'+msg[i].title+'';<br />                     }<br /> //Delete the content marked with name next in the next select. <br />                         $("option[name='region_" + next + "']").remove();<br /> // Add the written content to the next select. <br />                          $('#region_' + next + '_' + address_id).append(option_str);<br />                                                                                                                                                                                                                        ‐—   //If the return value is empty, remove all marked options and restore the default options. <br /> for (var i = next; i <= 4; i++) {<br />                         $("option[name='region_" + i + "']").remove();<br />                     }<br />                 }<br />              }<br /> <br />          })<br /> }<br /> </script><br><!-- 地域 -->控制器：    /**<br> * [labindex multi-level linkage]<br> * @return [type] [description]<br> ​​*/<br>     public function labindex(){<br>         //实验室地域<br>         $d=D('LabTypeRegion');<br>         if(IS_POST){<br>             if($_POST['region_id']){<br>                 $region_id = $_POST['region_id'];<br>                 $condition['pid'] = $region_id;<br>                 $list = $d->where($condition)->select();<br>                 // echo json_encode($list);<br>                 $this->ajaxReturn($list);<br>             }<br>         }else{<br>             $condition['pid'] = array('neq',0);<br>             $condition['level'] = 1;<br>             $list = $d->where($condition)->select();<br>             $this->assign('list',$list);<br> <br>         }<br>         //实验室地域<br> <br>         $this->display();<br>     }

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