BikeShed-1/app/assets/javascripts/devise/registrations.js

$(document).ready(function(){
  var MIN_LEN = 3;
  var MAX_SUBMITS = 3;
  var submit_count = 0;
  $("input[name=commit]").click( function(e){
    console.log("clicked");
    submit_count += 1;
    //IDs of contact info
    var contact_info_ids = [
      "user_email",
      "user_user_profiles_attributes_0_addrStreet1",
      "user_user_profiles_attributes_0_addrCity",
      "user_user_profiles_attributes_0_addrState",
      "user_user_profiles_attributes_0_addrZip",
      "user_user_profiles_attributes_0_phone"
    ];
    var contact_vals = "";
    var index = 0;
    //see if any contact info exists
    for( var index in contact_info_ids){
      contact_vals += $("#"+contact_info_ids[index]).val();
    }
    if( contact_vals.length >= MIN_LEN || submit_count > MAX_SUBMITS){

      if( submit_count > MAX_SUBMITS ){
        alert("Fine.");
      }
      return true;

    }else{

      switch(submit_count){
        case 1:
          alert("It appears you have not entered any contact information.  " +
            "Please do.");
          break;
        case 2:
          alert("It is highly recommended that you enter at least one form of" +
            " contact information.  It is in your best interest.");
          break;
        case 3:
          alert("If something happens to your bicycle, we will not be able to" +
            " notify you.  Please enter at least one form of contact.");
          break;
        default:
          alert("Please enter at least one form of contact.");
      }
      return false;
    }
  });
});