How to remotely (with a different C# script or js) activate function from the main C# script?

Question

I've been searching and really havent found a solution that I could understand.

I want it as simple as possible, this is what I have:

C# function from my main script file called "mainScript.cs":

 public void OpenBuyMenu ()
     {
         BuyMenu.enabled =! BuyMenu.enabled;
         GameObject.Find("FPSController").GetComponent<FirstPersonController>().enabled =! GameObject.Find("FPSController").GetComponent<FirstPersonController>().enabled;
     }

I want this function to execute when the player is within a trigger area of a certain object and the key M is pressed. Now I'm very new to C#, but in js I can build the script all the way up to activating the function above. This is the js file that could do all that:

 private var enter : boolean; //this is enabled when the player is ontriggerentenr from the door
 var ShowGUILabel : boolean = true; //Put it on if you want to read "press f to open the door" when you are near the door
 
  function Update (){
           if (Input.GetKeyDown(KeyCode.M) && enter == true)
          {
             //what goes here?
          }
  }
  
  function OnGUI () {
  
      if(ShowGUILabel == true && enter == true)
      {GUI.Label(Rect(Screen.width / 2 - 100, Screen.height -100, 250, 100), "Press [M] to open Menu. ");}}
 
  //Activate the Main function when player is near the door
  function OnTriggerEnter (other : Collider){
  if (other.gameObject.tag == "Player") {
  enter = true;
  }
  }
  
  //Deactivate the Main function when player is go away from door
  function OnTriggerExit (other : Collider){
  if (other.gameObject.tag == "Player") {
  enter = false;
  }
  }

Now what I would like to know is, can I do this the easy way by adding some js coding on the spot where it says '//what goes here?" or maybe even better, how can I activate the function when the player is in the trigger area AND de M key is pressed by just using C#?

Thanks for the help!

Answer 1

You have to reference the mainScript.cs class in your other script, this is the code translate to C# of the Trigger Objetc.

 using UnityEngine;
 
 public class Trigger: MonoBehaviour
 {
 
 private bool enter; //this is enabled when the player is ontriggerentenr from the door
 private bool ShowGUILabel = true; //Put it on if you want to read "press f to open the door" when you are near the door
     public mainScriptClassName BuyMenu;//The reference of your mainScript.cs class
 
     void Update()
     {
         if (Input.GetKeyDown(KeyCode.M) && enter == true)
         {
             BuyMenu.OpenBuyMenu();//Call the function OpenBuyMenu in mainScript.cs
         }
     }
 
     void OnGUI()
     {
 
         if (ShowGUILabel == true && enter == true)
         {
             GUI.Label(new Rect(Screen.width / 2 - 100, Screen.height - 100, 250, 100), "Press [M] to open Menu. ");
         }
     }
 
     //Activate the Main function when player is near the door
     void OnTriggerEnter(Collider other)
     {
         if (other.tag == "Player")
         {
             enter = true;
         }
     }
 
     //Deactivate the Main function when player is go away from door
     void OnTriggerExit(Collider other)
     {
         if (other.tag == "Player")
         {
             enter = false;
         }
     }
 }

How to remotely (with a different C# script or js) activate function from the main C# script?

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