Set Radiobuttonlist Selected from Codebehind

Question

Hey I have a radiobuttonlist and trying to set one of the radiobuttons to selected based on a session variable but proving impossible    lt asp radiobuttonlist id  radio1  runat  server  AutoPostBack  True  OnSelectedIndexChanged  RadioButtonList1 SelectedIndexChanged  gt      lt asp listitem id  option1  runat  server  value  All   gt      lt asp listitem id  option2  runat  server  value  1    gt      lt asp listitem id  option3  runat  server  value  2    gt   lt  asp radiobuttonlist gt     I e How can I set option2 to selected in code behind

User · Answer

We can change the item by value  here is the trick   radio1 ClearSelection    radio1 Items FindByValue  1   Selected   true    1 is the value of option2

User · Answer

var rad id   document getElementById   lt   radio btn lst ClientID   gt     var radio   rad id getElementsByTagName  input    radio 0  checked   true     this for javascript in asp net try this in  aspx page      if you select other radiobutton  increase  0  to  1  or  2  like this

User · Answer

You could do   radio1 SelectedIndex   1    But this is the most simple form and would most likely become problematic as your UI grows  Say  for instance  if a team member inserts an item in the RadioButtonList above option2 but doesn t know we use magic numbers in code-behind to select - now the app selects the wrong index   Maybe you want to look into using FindControl in order to determine the ListItem actually required  by name  and selecting appropriately  For instance     omitting possible null reference checks    var wantedOption   radio1 FindControl  option2   Selected   true

User · Answer

The best option  in my opinion  is to use the Value property for the ListItem  which is available in the RadioButtonList   I must remark that ListItem does NOT have an ID property    So  in your case  to select the second element  option2  that would be      SelectedValue expects a string radio1 SelectedValue    1      Alternatively  yet in very much the same vein you may supply an int to SelectedIndex      SelectedIndex expects an int  and are identified in the same order as they are added to the List starting with 0  radio1 SelectedIndex   1

User · Answer

Try this option   radio1 Items FindByValue  1   Selected   true

[asp.net] Set Radiobuttonlist Selected from Codebehind

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