Detect if player is facing a certain block

[PixelCraft_I_D_K]

Hi there! I need some assistance with detecting if a player is facing a certain block.
Here is my code.

on right click:
    if player is holding white dye named "&f&lDoor Open":
        if player is facing iron door:
            make player execute command "thru"
        else:
            send "&cYou have to be facing a door to go through it!" to player

There is an error with "If player is facing iron door."
How can I make it so I can make a player execute a command only when facing an iron door? All replies are thanked

 

[NixTer]

You can check the player's target block.

if player's target block is iron door

OR...
you can check the clicked block

if clicked block is iron door

 

[PixelCraft_I_D_K]

You can check the player's target block.

if player's target block is iron door

OR...
you can check the clicked block

if clicked block is iron door

It works! Thank you so much!