How do you create a button and load a script onto it using code?

Questions & Answers
1

Hallo fellow developers

I am busy with a project that requires list boxes, basically my scene will start up a list with text (Buttons) appears on the right hand side and another on the left with a scroll bar attached. When the scene starts up an X amount of buttons will appear on both sides. The scroll bar will move the positions of the buttons up or down ( On the Y axis ) the top/bottom buttons will move out of view from the user.

Here is the code for how I am creating a button at the moment.

float posLeft;
float posTop;

	void OnGUI()
	{
		posLeft = 0;
		posTop = 0;
		for (int i = 0; i < 5; i++) {
			posTop+= +105;
			if (GUI.Button (new Rect (posLeft, posTop,100,100), "Button" + i)) {

				Debug.Log ("Test");
			}
		}
	}

I can’t find any code on loading scripts onto the button as I create them. The scripts I want to load on the button is to just give them extra functionality (OnPointerEnter/OnPointerExit etc)

Thank you for your time

EDIT: Answer to my question is in this code.

using UnityEngine;
using System.Collections;
using UnityEngine.UI;
public class ListBox : MonoBehaviour {

	Canvas can;
	RectTransform rct;
	Image img;
	CanvasRenderer cr;
	SpriteRenderer spt;

	Text butText;

	GameObject mygo;
	GameObject mygo2;
	GameObject mygo3;

	float posY = 443;
	void Start () {

		mygo = GameObject.FindGameObjectWithTag ("canPreset1");


		for(int i = 0; i < 18; i++)
		{
			mygo2 = new GameObject("Button" + i, typeof(Button));
			mygo3 = new GameObject("Text" + i, typeof(Text));

			mygo2.layer = 5;

			mygo2.AddComponent<RectTransform>();
			mygo2.AddComponent<Image>();
			mygo2.AddComponent<CanvasRenderer>();
			mygo2.AddComponent<Sctipt>();

			rct = mygo2.GetComponent<RectTransform>();
			img = mygo2.GetComponent<Image>();
			cr = mygo2.GetComponent<CanvasRenderer>();


			rct.position = new Vector3(727,posY,0);
			rct.sizeDelta = new Vector2(160,30);

			spt = GameObject.FindGameObjectWithTag("sprite").GetComponent<SpriteRenderer>();
			img.sprite = spt.sprite;
			img.type = Image.Type.Sliced;

			mygo3.layer = 5;

			butText = mygo3.GetComponent<Text>();
			rct = mygo3.GetComponent<RectTransform>();

			butText.text = "I was Programmed";
			butText.font = GameObject.FindGameObjectWithTag("txtPreset1").GetComponent<Text>().font;
			butText.color = Color.black;

			rct.position = new Vector3(727 + 5,posY - 5,0);
			rct.sizeDelta = new Vector2(150,25);

			mygo2.transform.parent = mygo.transform;
			mygo3.transform.parent = mygo2.transform;

			posY = posY - 25;
		}
	}
	
}
2

Instead of using the OnGUI system, you should consider switching to the new UI system using a Canvas. Since the OnGUI buttons aren’t actually gameObjects, you can’t attach custom scripts to them; The best you can do is create an if statement for them that calls a function you have pre-written.

If you’re using the Canvas system, the buttons are gameObjects, meaning that after you create them, you can just call AddComponent onto them to place the correct scripts. Also, you can set custom OnClick functionality for them using delegates, meaning they could also do things the same way as the OnGUI buttons.

You can find some information on how to use the new UI system here: Learn game development w/ Unity | Courses & tutorials in game design, VR, AR, & Real-time 3D | Unity Learn

3

After lots of research and googling I found my answer. Thank you for pointing out that I should use the new UI system. I will be posting my answer in the original question for in case someone wants to manual script buttons.