如何在c＃中检索单选按钮的name属性

Question

I've created a series of radio button controls in C#. (radCompany, radProperty etc.)
I've set their group name to be the same (282_Type) so they function as a list of radio buttons.

How do I retrieve the name (like: ct100$m$dfgadjkfasdghasdkjfg$282_Type) in c# so I can use this in a Javascript method i'm creating?

The values output are:

Radion Button 1  
id="ct223423432243_radCompany" name="ct100$sdfsdf$sdfsdf$282_Type"  
Radion Button 2  
id="ct223423432243_radProperty" name="ct100$sdfsdf$sdfsdf$282_Type"  

Answer 1

You need to reference the ClientID of the control; this is the id in the final html.

Of course, another approach might be to use some other attribute (such as the css etc), and use jQuery to find it; jQuery takes a lot of DOM pain away from javascript. It is interesting that jQuery is now even supported by VS2008 (with intellisense etc).

I'm currently reading jQuery in Action , and liking it much. To take an example straight from the book (on the subject of radios):

var x = $('[name=radioGroup]:checked').val();

which returns the value of the single checked radio button in the group, or undefined if none is selected.

Re getting the name; it uses the internal UniqueGroupName property, which does a lot of mangling. An option (but not an attractive one) would be to use reflection to read UniqueGroupName . Alternatively, use something simple like a literal control. Gawd I hate the ASP.NET forms model... roll on MVC...

Fianlly - I'm currently looking at the public VS2010 CTP image; one of the new additions for ASP.NET is static ClientID s, by setting ClientIdMode = Static on the control. A bit overdue, but not unwelcome.

Answer 2

http://reflector.webtropy.com/default.aspx/Net/Net/3@5@50727@3053/DEVDIV/depot/DevDiv/releases/whidbey/netfxsp/ndp/fx/src/xsp/System/Web/UI/WebControls/RadioButton@cs/2/RadioButton@cs

internal string UniqueGroupName {  
        get { 
            if (_uniqueGroupName == null) {  
                // For radio buttons, we must make the groupname unique, but can't just use the  
                // UniqueID because all buttons in a group must have the same name.  So 
                // we replace the last part of the UniqueID with the group Name.  
                string name = GroupName; 
                string uid = UniqueID; 

                if (uid != null) {  
                    int lastColon = uid.LastIndexOf(IdSeparator); 
                    if (lastColon >= 0) {  
                        if (name.Length > 0) {  
                            name = uid.Substring(0, lastColon+1) + name; 
                        }  
                        else if (NamingContainer is RadioButtonList) { 
                            // If GroupName is not set we simply use the naming 
                            // container as the group name 
                            name = uid.Substring(0, lastColon);  
                        } 
                    }  

                    if (name.Length == 0) { 
                        name = uid;  
                    } 
                } 

                _uniqueGroupName = name;  
            } 
            return _uniqueGroupName;  
        }  
    }

Answer 3

You want the UniqueID attribute:

• UniqueID — The hierarchically-qualified unique identifier assigned to a control by the ASP.NET page framework.

• ClientID — A unique identifier assigned to a control by the ASP.NET page framework and rendered as the HTML ID attribute on the client.The ClientID is different from the UniqueID because the UniqueID can contain the colon character (:), which is not valid in the HTML ID attribute (and is not allowed in variable names in client-side script).

( from here )