// Draws a text field and when it gets modified prints a message
var stringToEdit : String = "Modify me.";

function OnGUI () {
    // Make a text field that modifies stringToEdit.
    stringToEdit = GUI.TextField (Rect (10, 10, 200, 20), stringToEdit, 25);
    if (GUI.changed)
        Debug.Log("Text field has changed.");
}

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    public string stringToEdit = "Modify me.";
    void OnGUI() {
        stringToEdit = GUI.TextField(new Rect(10, 10, 200, 20), stringToEdit, 25);
        if (GUI.changed)
            Debug.Log("Text field has changed.");
        
    }
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

    public stringToEdit as string = 'Modify me.'

    def OnGUI():
        stringToEdit = GUI.TextField(Rect(10, 10, 200, 20), stringToEdit, 25)
        if GUI.changed:
            Debug.Log('Text field has changed.')