Widget API: Frame:SetScript

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Sets an event handler for a specific event type for this frame.

frame:SetScript("handler", func)

Parameters

handler: string - the name of the handler type, like 'OnShow', 'OnClick'. See Widget_handlers.
func: function - the Lua function to call or 'nil' to remove the handler

for i = 1, 4 do
    local frame = _G["PartyMemberFrame"..i]
    frame:SetScript("OnShow", frame.Hide)
end

Adds an 'OnShow' event handler to all party frames to be called whenever they're shown.

PartyMemberFrame1:SetScript("OnShow", nil)

Removes whatever 'OnShow' handler was set from 'PartyMemberFrame1'.