Input Dialog show, but not result

FiveM Resource Development Discussion
1

Hey,

I have add a Text Dialog, where i can input my numberplate.

Now its the Problem, when i input a text then dont functionality.

I dont know whats wrong:

		DisplayOnscreenKeyboard(1, "FMMC_MPM_NA", "", "", "", "", "", 5)
		while (UpdateOnscreenKeyboard() == 0) do
			DisableAllControlActions(0);
			Wait(0);
		end
		if (GetOnscreenKeyboardResult()) then
			local inputname = GetOnscreenKeyboardResult()
			TriggerServerEvent('veh_SR:CheckMoneyForVeh', this, button.model, button.costs, "car", inputname)
			print("Client: "..inputname)
		end

Here the EventHandler:

RegisterServerEvent('veh_SR:CheckMoneyForVeh')
AddEventHandler('veh_SR:CheckMoneyForVeh', function(category, vehicle, price ,veh_type, inputname)
  local player = vRP.getUserSource({user_id})
  MySQL.query("vRP/get_vehicle", {user_id = user_id, vehicle = vehicle}, function(pvehicle, affected)
	if #pvehicle > 0 then
		vRPclient.notify(player,{"~r~Du besitzt bereits dieses Fahrzeug."})
	else
	    local actual_price = getPrice( category, vehicle)
		if actual_price == nil then
		    print( "Das Auto "..vehicle.." hat in der Kategory "..category.." keinen Festpreis" )
			vRPclient.notify(player,{"~r~Dieses Auto ist Ausverkauft!"})
			return 
		end
		if  actual_price ~= price then
			print( "Player-ul cu id-ul "..user_id.. " e suspect de Cheat Engine.")
		end	
		if vRP.tryFullPayment({user_id,actual_price}) then
			vRP.getUserIdentity({user_id, function(identity)
              MySQL.query("vRP/add_custom_vehicle", {user_id = user_id, vehicle = vehicle, vehicle_plate = "P "..inputname, veh_type = veh_type})
			end})
			TriggerClientEvent('veh_SR:CloseMenu', player)
			vRPclient.notify(player,{"Bezahlt ~r~"..actual_price.."$."})
			vRPclient.notify(player,{"Um das Auto ab zu holen, besuchen Sie eine Garage"})
		else
			vRPclient.notify(player,{"~r~Nicht genug Geld."})
		end
	end
  end)
end)

Don´t come print and don´t open my Event Handler.

Thanks for Help