# update v2.5.0+

The update callback will be triggered when the value of the field configured in value or link changes. You can do some linkage processing about value in the update callback

# Type

type update = (val:any, rule:FormRule, fApi:fApi)=>Boolean|void

# Example

# Modify value to the title of the component

# Trigger the callback of input1 when input2 changes

link configuration example

# Hide component when input value is empty