WoW API: SetOverrideBindingItem

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Creates an override binding that uses an item when triggered.

SetOverrideBindingItem(owner, isPriority, "key", "item");

ArgumentsEdit

owner: Frame - The frame this binding "belongs" to; this can later be used to clear all override bindings belonging to a particular frame.
isPriority: Boolean - true if this is a priority binding, false otherwise. Both types of override bindings take precedence over normal bindings.
key: String - Binding to bind the command to. For example, "Q", "ALT-Q", "ALT-CTRL-SHIFT-Q", "BUTTON5"
item: String - Name or item link of the item to use when binding is triggered.

Override bindings take precedence over the normal SetBinding bindings. Priority override bindings take precedence over non-priority override bindings.
Override bindings are never saved, and will be wiped by an interface reload.
You cannot use this function to clear an override binding; use SetOverrideBinding instead.