WoW:API IsUsableSpell

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Determines whether a spell can be used by the player character.

usable, nomana = IsUsableSpell("spellName" or spellID or spellIndex[, "bookType"]);

Arguments

spellName

String: name of the spell to check.

spellIndex

Number: index of a spell in the player's (or pet's) spellbook.

spellID

Number: SpellID of a spell to check.

bookType

String: does the spellIndex refer to the player's spellbook (BOOKTYPE_SPELL constant, default), or the pet's spellbook (BOOKTYPE_PET constant).

Returns

usable

Boolean : 1 (true) if the spell is usable, nil otherwise. A spell is not usable if any of the following conditions apply:

• The player hasn't learned the spell
• The player lacks required mana or reagents.
• Reactive conditions haven't been met.

nomana

Boolean : 1 (true) if the spell can not be cast due to low mana, nil otherwise.

Example

 usable, nomana = IsUsableSpell("Curse of Elements");
 if (not usable) then
  if (not nomana) then
    message("The spell cannot be cast");
  else
    message("You do not have enough mana to cast the spell");
  end
 else
    message("The spell may be cast");
 end

 usable, nomana = IsUsableSpell(20, BOOKTYPE_SPELL); 
 print(GetSpellName(20, BOOKTYPE_SPELL) .. " is " .. (usable and "" or "not ") .. " usable.");