jQuery-如何根据值选择下拉项
问题描述：
我想设置一个下拉列表(选择)，以根据条目的值进行更改.
I want set a dropdown(select) to be change based on the value of the entries.
我有
<select id="mySelect">
<option value="ps">Please Select</option>
<option value="ab">Fred</option>
<option value="fg">George</option>
<option value="ac">Dave</option>
</select>
我知道我想更改下拉菜单，以便选择值为"fg"的选项.如何使用JQuery做到这一点?
And I know that I want to change the dropdown so that the option with the value of "fg" is selected. How can I do this with JQuery?
答
您应该使用
$('#dropdownid').val('selectedvalue');
这里是一个例子:
$('#dropdownid').val('selectedvalue');
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<select id='dropdownid'>
<option value=''>- Please choose -</option>
<option value='1'>1</option>
<option value='2'>2</option>
<option value='selectedvalue'>There we go!</option>
<option value='3'>3</option>
<option value='4'>4</option>
<option value='5'>5</option>
</select>