How to track and change a variable across multiple scenes?

[Ahmad_Khawaja2011]

Godot 4.3

I’m trying to put a health variable across multiple scenes; at first I thought it wasn’t possible, and I just copied the health variable from one scene to another because the only thing changing the variable was the spacebar (which was a placeholder). So for an example on the main scene, that was the code:

var health = 100

func _ready() -> void:
	$Health.text = "Health: " + str(health)
	$Health.modulate = Color.WHITE
	
	
	
func _input(event):
	if event.is_action_pressed("Space") and health >= 10:
		$Health.modulate = Color.RED
		await get_tree().create_timer(0.15).timeout
		health -= 10
		$Health.modulate = Color.WHITE
		$Health.text = "Health: " + str(health)

The player code would be like this:

var health = 100
#other code
func _input(event):
	if event.is_action_pressed("Space") and health >= 10:
		health -= 10
#other code
		if health <= 0:
			death()

	
func death ():
	$CollisionShape2DA.disabled = true
	animated_sprite.play("Death")

But that couldn’t work when I made the enemy scene, and I barely understood signals from Brackeys.
So I watched this tutorial and inferred Autoloads are the same as globals, but when I implemented the tutorial on to my code, it gave me this error message

How can I fix this?

(I might’ve put too many details but I’m not sure what’s necessary and what’s not; I’ve only started a few days ago.)

[Mahan]

For such variables, the best way is to use a global script, create a new script, put the variable in it, and add it with a custom name (e.g. Global) in the project settings in the Autoloads tab, now just use Global.health to point it. Example:

# in global.gd

var health = 100

# in some_script.gd

func _ready() -> void:
	$Health.text = "Health: " + str(Global.health)
	$Health.modulate = Color.WHITE
	
	
	
func _input(event):
	if event.is_action_pressed("Space") and health >= 10:
		$Health.modulate = Color.RED
		await get_tree().create_timer(0.15).timeout
		Global.health -= 10
		$Health.modulate = Color.WHITE
		$Health.text = "Health: " + str(health)

This method works without errors, but your warning is not necessarily related to this, as it is written in the debugger you can use this line:

$node_path.remove_child.call_deferred(child)

Instead:

$node_path.remove_child(child)

[Ahmad_Khawaja2011]

I already have the global script but I tried your way and the 3 issues disappeared
but another issue popped up:

I’m not sure what it means, but it pointed at the line that includes “elif.”

if is_on_floor():
			if direction == 0:
				animated_sprite.play("Idle")
			else:
				animated_sprite.play("Run")
elif health >= 10 and not is_on_floor():
			animated_sprite.play("Jump")

[Mahan]

This error shows that health is not an int, I don’t understand why, but:
If you’re using a global health maintenance you can use Global.health here as well, or if that’s true, use int(health)

[Ahmad_Khawaja2011]

It now says “breakpoint” while still pointing to this code:

elif int(Health.health) >= 10 and not is_on_floor():

[Mahan]

This is because you accidentally added a break point on this line, this will show up in the form of a red circle on the left side of the line, which will be disabled if you click on it.

[Ahmad_Khawaja2011]

There are no errors anymore, but the enemy doesn’t decrease the health variable upon contact with the player.

(Also thanks alot for your help)

[Mahan]

This is probably because you haven’t changed all the health to Health.health