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# refresh Attribute

Specifies when the expression will be evaluated.

## Type

`xsd:string`

## Parent Elements

Element | Description
--- | ---
calculatedField | Defines an individual calculation, including the formula, when the calculation is to be performed, and where the result will be stored.

## Definition

    <xsd:attribute name="refresh" type="xsd:string" use="required" ></xsd:attribute>

## Remarks

The expression specified by the expression attribute is evaluated according to the refresh attribute of the calculatedField element. A value of "onInit" causes the expression to be evaluated when the node is initialized. A value of "onChange" causes the expression to be evaluated when one or more parameters of the expression change.

Note This item is not supported when the Disable Service Pack features option on the Advanced tab of the Options dialog box in InfoPath is selected or when Microsoft Office 2003 Editions Service Pack 1 or later is not installed. Any form defined by a form definition file (.xsf) that includes this item cannot be opened in InfoPath when service pack features are disabled or unavailable.

## Example

The following is an example of the refresh attribute as it is used in the calculatedField element:

    <xsf:calculations>
     <xsf:calculatedField
      target="/my:myFields/my:average"
      expression="xdMath:Avg(../my:expenses/my:expense/my:amount)"
      refresh="onChange" />
    </xsf:calculations>

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