jQuery的下拉组

Question

我有选择（下拉）盒一个问题...

问题是我有一组下拉菜单，并具有一组的下拉列表中的每一个下拉..

虽然改变下拉那么所有的孩子的下拉列表中被改变的值选择

---

请帮我

具有下列代码下拉框

当父下拉变化那么所有的孩子下拉菜单将通过更改值选择

 <table> 
     <tr> 
     <th>Parent DropDown</th> 
     <th colspan="3">Child Dropdowns</th> 
     </tr> 
<tr> 
<td> 
<select name="class_1" id="class_1"> 
<option value="First">First</option> 
<option value="Second">Second</option> 
</select> 
</td> 
<td> 
<select name="subClass_1" class="select_1"> 
<option value="First">First</option> 
<option value="Second">Second</option> 
</select> 
</td> 
<td> 
<select name="subClass_2" class="select_1"> 
<option value="First">First</option> 
<option value="Second">Second</option> 
</select> 
</td> 
<td> 
<select name="subClass_3" class="select_1"> 
<option value="First">First</option> 
<option value="Second">Second</option> 
</select> 
</td> 
</tr> 

<tr> 
<td> 
<select name="class_2" id="class_2"> 
<option value="First">First</option> 
<option value="Second">Second</option> 
</select> 
</td> 
<td> 
<select name="subClass_1" class="select_2"> 
<option value="First">First</option> 
<option value="Second">Second</option> 
</select> 
</td> 
<td> 
<select name="subClass_2" class="select_2"> 
<option value="First">First</option> 
<option value="Second">Second</option> 
</select> 
</td> 
<td> 
<select name="subClass_3" class="select_2"> 
<option value="First">First</option> 
<option value="Second">Second</option> 
</select> 
</td> 
</tr> 

<tr> 
<td> 
<select name="class_3" id="class_3"> 
<option value="First">First</option> 
<option value="Second">Second</option> 
</select> 
</td> 
<td> 
<select name="subClass_1" class="select_3"> 
<option value="First">First</option> 
<option value="Second">Second</option> 
</select> 
</td> 
<td> 
<select name="subClass_2" class="select_3"> 
<option value="First">First</option> 
<option value="Second">Second</option> 
</select> 
</td> 
<td> 
<select name="subClass_3" class="select_3"> 
<option value="First">First</option> 
<option value="Second">Second</option> 
</select> 
</td> 
</tr> 
</table> 

Answer 1

据我了解它的下拉列表之间的父子关系。当父母下拉列表的值发生变化时，子代下拉列表中的值也应该改变。

这些情况经常出现在国家，州，市选择。

如果是这种情况，那么你需要处理onchange事件的下拉菜单。

$(element).change(function(){ 
    //coding for the same.................. 
});