A timer or interval started inside a pane must be cancelled when the pane closes. The timer must also be cancelled before new timers start in the same pane. This prevents hidden operations that cause layout problems.
By Pawan Nayar · from the LLOS AI Learning record
A timer or interval started inside a pane must be cancelled when the pane closes.
The timer must also be cancelled before new timers start in the same pane. This prevents hidden operations that cause layout problems.
Timers started inside a pane can keep running after the pane closes. These timers perform operations on the hidden pane's elements. These hidden operations can cause visible layout shifts in other open panes. The original fix might not have stopped these timers.
A developer creates a pane with an animation that uses a timer. The animation shows cards appearing one by one. When the user closes the pane, the developer thinks the animation stops. But the timer keeps running in the background. This causes other parts of the application to move unexpectedly.
Resolved from this lesson's own record — real definitions, not invented for this page.
More from the same record, pulled by shared topic — not written new for this page.
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A timer or interval started inside a pane must be cancelled when the pane closes. The timer must also be cancelled before new timers start in the same pane. This prevents hidden operations that cause layout problems.