GUI.SetNextControlName

Description

Set the name of the next control.

This makes the following control be registered with a given name.

Additional resources: GetNameOfFocusedControl, FocusControl.

// Sets the login textfield with "user".  If it is selected and the user
// presses enter, it prints Login

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour
{
    public string login = "username";
    public string login2 = "no action here";

    void OnGUI()
    {
        GUI.SetNextControlName("user");
        login = GUI.TextField(new Rect(10, 10, 130, 20), login);

        login2 = GUI.TextField(new Rect(10, 40, 130, 20), login2);
        if (Event.current.Equals(Event.KeyboardEvent("return")) && GUI.GetNameOfFocusedControl() == "user")
            Debug.Log("Login");

        if (GUI.Button(new Rect(150, 10, 50, 20), "Login"))
            Debug.Log("Login");
    }
}