# Interface: IAuWidgetFunctionTriggerConfig

Provides properties that are used to execute synchronous or async functions.

You can use these properties in **params** of the [AuWidgetFunctionTrigger](../classes/auwidgetfunctiontrigger.md) class.

The following example illustrates how you can listen for property changes to execute a custom function.

```
{
  "widgets": [
   {
      "name": "name",
      "type": "option",
      "params": {
          "type": "list",
          "title": "Name",
          "prompt": "Choose a name",
          "values": [
              { "title": "Jack" },
              { "title": "James" },
              { "title": "John" }
           ]
      }
   },
   {
     "name": "myFunction",
     "type": "function-trigger",
     "params": {
          "arguments": [
             "{{ $['name']._.title }}",
             "{{ $['name']._.title }}"
          ],
          "callback": [
              "{{ #function(arg1, arg2) console.log(arg1, arg2) }}",
              "{{ #asyncFunction await new Promise(...) }}"
          ]
          "catch": [
             "{{ #function console.error("failed") }}",
          ],
          "finally": [
             "{{ #function console.log("cleanup") }}",
          ]
     }
   }
 ]
}
```

## Hierarchy

* **IAuWidgetFunctionTriggerConfig**

## Index

### Properties

* [arguments](iauwidgetfunctiontriggerconfig.md#arguments)
* [callback](iauwidgetfunctiontriggerconfig.md#callback)
* [catch](iauwidgetfunctiontriggerconfig.md#catch)
* [enabled](iauwidgetfunctiontriggerconfig.md#enabled)
* [finally](iauwidgetfunctiontriggerconfig.md#finally)
* [lock](iauwidgetfunctiontriggerconfig.md#lock)

## Properties

###  arguments

• **arguments**: *Array‹string› | string*

An array of parameters change of which should trigger specified callbacks.

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###  callback

• **callback**: *Function | Array‹Function›*

A function `("{{#function <expression>}}")` or an array of functions that are executed when `arguments` parameter changes.

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###  catch

• **catch**: *Function | Array‹Function›*

A function `("{{#function <expression>}}")` or an array of functions that are executed if the `callback` fails.

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###  enabled

• **enabled**: *boolean*

If `false`, the `callback` will not be executed. The default value is `true`.

___

###  finally

• **finally**: *Function | Array‹Function›*

A function `("{{#function <expression>}}")` or an array of functions that are executed after the `callback`, regardless of its outcome.

___

###  lock

• **lock**: *string[] | string*

The widget names that should be locked while waiting for the `callback`. The editor will show a preloader on this widget.