There is an Input field, which, depending on the selected settings, either the adding function to the database or the search for the database with the specified mask.
Form:

& lt; form method = "post" & gt;
    & lt; p & gt; Member last name:
    & lt; p & gt; & lt; input id = "new_partner" name = "name_partner" type = "text" placeholder = "surname" & gt;
    & lt; p & gt; Mode of operation:
      & lt; p & gt; & lt; input id = "Check" name = "option1" type = "Radio" & gt; Adding a new member
        & lt; input id = "Check" name = "option2" type = "Radio" & gt; Search for a member by specified mask
     & lt; div id = "link" hidden & gt;
      & lt; p & gt; Additional settings:
      & lt; p & gt; & lt; input id = "Check" name = "option3" type = "checkbox" & gt; Autodist Table Participants
     & lt; / div & gt;
    & lt; p & gt; & lt; input type = "submit" name = "submit" Value = "Run" & gt;
      & lt; input type = "submit" name = "submit" value = "View the entire list of participants" & gt;
  & lt; / form & gt;

How to use AJAX to check the selected RADIO INPUT settings so that when selecting the “Search for the Participant Mask” item, the script launched below?

Script, which makes a search with the specified condition (registered for another INPUT):

$ (function () {
  $ ("# search"). Keyup (Function () {
    Var Search = $ ("# search"). Val ();
    $.ajax ({
      Type: "POST",
      URL: "/ ACTION",
      Data: {"SEARCH": Search},
      Cache: False,
      SUCCESS: FUNCTION (Response) {
        $ ("# rasearch"). HTML (Response);
      }
    });
    RETURN FALSE;
  });
});

Answer 1, Authority 100%

Add to HTML Values ​​Value RadioButton’ov, and Name should be the same with them:

& lt; input id = "check" name = "optionradio" value = "1" type = "Radio" & gt; Adding a new member
& lt; input id = "Check" name = "optionradio" value = "2" type = "Radio" & gt; Search for a member by specified mask

Now you need to get Value from the selected button’a in switching them:

$ ('input [name = optionradio]). Change (Function () {
   var value = $ ('INPUT [NAME = OptionRadio]: Checked'). Val ();
});

And then, based on the value, build your button behavior logic. Example