Refresh Data Using a Refresh Button

This scenario demonstrates:

  • How to force a variable to be refreshed even if its dependencies haven't changed.

Expression

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a!localVariables(
  local!refreshCounter: 0,
  local!startIndex: a!refreshVariable(
    value: 1,
    refreshOnVarChange: local!refreshCounter
  ),
  local!pagingInfo: a!pagingInfo(local!startIndex, 5),
  local!employees: a!refreshVariable(
    value: a!queryEntity(
      entity: cons!EMPLOYEE_ENTITY,
      query: a!query(
        pagingInfo: local!pagingInfo
      ),
      fetchTotalCount: true
    ),
    refreshOnVarChange: local!refreshCounter
  ),
  {
    a!buttonArrayLayout(
      buttons: {
        a!buttonWidget(
          label: "Refresh",
          size: "SMALL",
          style: "SECONDARY",
          saveInto: a!save(local!refreshCounter, local!refreshCounter + 1)
        )
      }
    ),
    a!gridField(
      labelPosition: "COLLAPSED",
      data: local!employees,
      columns: {
        a!gridColumn(label: "Name", value: concat(fv!row.firstName, " ", fv!row.lastName)),
        a!gridColumn(label: "Department", value: fv!row.department),
        a!gridColumn(label: "Title", value: fv!row.title)
      },
      pagingSaveInto: a!save(local!startIndex, fv!pagingInfo.startIndex)
    )
  }
)

Test it out

  1. Update the Employee data in the database
  2. Click the Refresh button to see the data change

Notable implementation details

  • The Refresh button increments a counter to make sure the value of local!refreshCounter always changes. Using a boolean flag that gets set to true when you click the button wouldn't work because the value wouldn't change between the first and second time you clicked the button.
  • Both local!startIndex and local!employees need to refresh when the refresh button is clicked. This makes sure that the user is on the first page once they click refresh and that the data is queried even if the start index didn't change (for example, if they were already on the first page).
  • If displaying a refresh button on an interface that is also refreshing on an interval, the last updated timestamp should be displayed next to the Refresh button.
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