Refresh

Refresh[expr,opts]

represents an object whose value in a Dynamic should be refreshed at times specified by the options opts.

Refresh[expr,None]

specifies that the value of expr should never automatically be refreshed.

Details and Options

The following options can be given:
TrackedSymbols Automatic symbols whose changes trigger an update

UpdateInterval Infinity time interval at which to do updates
When Refresh[expr,opts] is evaluated inside a Dynamic, it gives the current value of expr, then specifies criteria for when the Dynamic should be updated.
When one Refresh appears inside another, the innermost Refresh takes precedence.
Refresh[expr] resets automatic updating even if it appears inside Refresh[…,None].
The setting UpdateInterval->t specifies that updating should be done at least every t seconds.
Refresh has attribute HoldFirst.

Examples

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Basic Examples (1)

Make a dynamically updating clock:

Scope (2)

By default, Dynamic updates as fast as possible:

Control the update using TrackedSymbols and UpdateInterval:

Update only when updates in a Manipulate:

Use UpdateInterval to specify how often should update:

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