preOpenCard

Type

message

Summary

Sent to a card when you go to the card.

Syntax

preOpenCard

Description

Handle the preOpenCard message to update a card's appearance before the card appears on screen.

The preOpenCard message is sent before the openCard message. Unlike openCard, preOpenCard handlers are executed before the card appears. Because of this, the preOpenCard handler is a good place to put code that adjusts the size, position, and appearance of objects; the changes are made before the card appears.

The actual navigation is not triggered by the preOpenCard message, so trapping the message and not allowing it to pass does not prevent the card from opening.

Examples

on preOpenCard -- highlight the "go to this card" button in a set
  set the hilitedButton of group "Cards" to the number of this card
  pass preOpenCard
end preOpenCard

Related

control structure: pass

glossary: object, handler, trap, message, execute

keyword: card

message: openCard, preOpenBackground, closeCard, preOpenStack

object: card

Compatibility and Support

Introduced

LiveCode 1.0

OS

mac

windows

linux

ios

android

Platforms

desktop

server

mobile