jquery 给下拉框赋值

jquery代码

 1 $(\'.edit-modal\').on(\'click\',function(){
 2         var id = $(this).attr(\'href\');
 3         var value = $(this).attr(\'value\');
 4         // get data
 5         var url="<?php echo $root;?>/editRobotActionNum";
 6         $.ajax({
 7             url: url,
 8             data: \'id=\'+value,
 9             type : \'POST\',
10             dataType : \'json\',
11             success : function(json)
12             {
13                 $(\'#editId\').attr(\'value\',json.id);
14                 $(\'select#edit_material_id\').val(json.material_id);
15                 $(\'select#edit_station_id\').val(json.station_id);
16                 $(\'#edit_up_action\').attr(\'value\',json.up_action);
17                 $(\'#edit_turn_action\').attr(\'value\',json.turn_action);
18                 $(\'#edit_down_action\').attr(\'value\',json.down_action);
19                 
20             }
21         });
22 
23         $(id).modal(\'show\');
24     });

html

1 <select class="form-control" id="edit_material_id" name="material_id">
2     <option value=""></option>
3     <?php foreach($stock_info as $row):?>
4         <option value="<?php echo $row[\'id\'];?>"><?php echo $row[\'name\'];?>    </option>
5     <?php endforeach;
6 </select>