如何在c＃中获取禁用下拉列表的选定值

Question

In my form there are two DropDownList controls.

1st is enabled and 2nd is disabled.

After selecting 1st dropdown I am changing selected value of 2nd dropdown using javascript.

Its working fine. But when I am trying to get selected value of 2nd dropdown, it will return value of first element (ie 'select').

Please refer my code

<asp:DropDownList ID="ddlStartTime1" runat="server" AutoPostBack="false" 
 Width="70" Enabled="false"></asp:DropDownList>

NOTE: I am using javascript to change selected value of 2nd(disabled) dropdown.

Javascript code:

$(document).ready(function() {
    $('#<%= ddlStartTime1.ClientID %>').change(function() {
        $('#<%= ddlEndTime1.ClientID %>').val($('#<%= ddlStartTime1.ClientID%>').val());
    })
});

Is there any alternate way to get changed value of disabled DropDownList?

Answer 1

If you are trying to read the value of 2nd dropdown (disabled one) at server, you will never be able to read the updated value, becuase data in disabled controls will not be posted back to server from client.

You should either enable the dropdown before posting your data to server or use hidden controls to hold data of your disabled dropdown.

Answer 2

You would need to add another input that is hidden . Whenever you change the value of your 1st DropDownList , you'd change the value of your 2nd DropDownList AND the value of the hidden input.

Server-side, you're not looking at the value of the 2nd DropDownList , but at the value of your hidden input. Make sure the hidden value is always sync with the 2nd DDL when you post your form.

Answer 3

只需在隐藏字段中添加禁用的下拉列表值，然后从隐藏字段读取值而不是dropdownlist。可能这会对您有所帮助。