Use Links in a Grid to Show More Details and Edit Data

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a!localVariables(
  /* We load the employee data into this variable. If you are populating
     this variable with a query, you would put .data at the end before passing
     it to the grid. */
  local!employees: { 
    a!map( id: 11, name: "Elizabeth Ward",  dept: "Engineering",     role: "Senior Engineer",      team: "Front-End Components",     pto: 15, startDate: today()-500),
    a!map( id: 22, name: "Michael Johnson", dept: "Finance",         role: "Payroll Manager",      team: "Accounts Payable",         pto: 2,  startDate: today()-100),
    a!map( id: 33, name: "John Smith",      dept: "Engineering",     role: "Quality Engineer",     team: "User Acceptance Testing",  pto: 5,  startDate: today()-1000),
    a!map( id: 44, name: "Diana Hellstrom", dept: "Engineering",     role: "UX Designer",          team: "User Experience",          pto: 49, startDate: today()-1200),
    a!map( id: 55, name: "Francois Morin",  dept: "Sales",           role: "Account Executive",    team: "Commercial North America", pto: 15, startDate: today()-700),
    a!map( id: 66, name: "Maya Kapoor",     dept: "Sales",           role: "Regional Director",    team: "Front-End Components",     pto: 15, startDate: today()-1400),
    a!map( id: 77, name: "Anthony Wu",      dept: "Human Resources", role: "Benefits Coordinator", team: "Accounts Payable",         pto: 2,  startDate: today()-300),
  },
  /* local!teamList would normally come from a constant or data source. */
  local!teamList: {
    "Accounts Payable",
    "User Acceptance Testing",
    "User Experience",
    "Commercial North America",
    "Front-End Components"
  },
  /* This variable is for storing the grid's selection. */
  local!selection,
  /* This variable is used to for the full row of data on the selected item
     to be passed to the details section of the interface. */
  local!selectedEmployee,
  local!readOnly: true,
  /* 
  *  You can view values of your local variables in the
  *  Local Variables pane on the right side of your interface, 
  *  so you can see you the changes being made to the data in realtime
  */
  {
    a!columnsLayout(
      columns: {
        a!columnLayout(
          contents: {
            a!sectionLayout(
              label: "Employees",
              contents: {
                a!gridField(
                  data: local!employees,
                  columns: {
                    a!gridColumn(
                      label: "Name",
                      value: fv!row.name
                    ),
                    a!gridColumn(
                      label: "Team",
                      value: fv!row.team
                    )
                  },
                  pageSize: 10,
                  selectable: true,
                  selectionStyle: "ROW_HIGHLIGHT",
                  selectionValue: local!selection,
                  selectionSaveInto: {
                    /* Using the index function to return the last-selected item ensures that
                       only one item will be selected at a time, regardless of how fast the user
                       clicks. */
                    a!save(local!selectedEmployee, index(fv!selectedRows, length(fv!selectedRows), null)),
                    /* We use the same method as above to limit the selection variable. */
                    a!save(local!selection, index(save!value, length(save!value), null))
                  },
                  shadeAlternateRows: false,
                  rowHeader: 1
                )
              }
            )
          }
        ),
        a!columnLayout(
          contents: {
            a!sectionLayout(
              label: "Details",
              contents: {
                a!richTextDisplayField(
                  value: a!richTextItem(
                    text: "No employee selected.",
                    color: "SECONDARY",
                    size: "MEDIUM",
                    style: "EMPHASIS"
                  ),
                  showWhen: isnull(local!selection)
                ),
                a!columnsLayout(
                  columns: {
                    a!columnLayout(
                      contents: {
                        a!textField(
                          label: "Name",
                          value: local!selectedEmployee.name,
                          readOnly: true
                        ),
                        a!textField(
                          label: "Department",
                          value: local!selectedEmployee.dept,
                          readOnly: true
                        )
                      },
                      width: "MEDIUM"
                    ),
                    a!columnLayout(
                      contents: {
                        /* In the following fields, we display from, and save to
                           local!selectedEmployee. */
                        a!textField(
                          label: "Role",
                          value: local!selectedEmployee.role,
                          saveInto: local!selectedEmployee.role,
                          readOnly: local!readOnly
                        ),
                        /* Because dropdown components can't be readOnly, we use a textField to
                           display the value and an if() statement to swap it out for the dropdown
                           when it's time to edit. */
                        if(
                          local!readOnly,
                          a!textField(
                            label: "Team",
                            value: local!selectedEmployee.team,
                            readOnly: true
                          ),
                          a!dropdownField(
                            label: "Team",
                            choiceLabels: local!teamList,
                            choiceValues: local!teamList,
                            value: local!selectedEmployee.team,
                            saveInto: local!selectedEmployee.team,
                            disabled: local!readOnly
                          )
                        ),
                        /* The link enables editing in the other components, and is hidden when
                           editing is enabled. */
                        a!linkField(
                          labelPosition: "COLLAPSED",
                          links: a!dynamicLink(
                            label: "Reassign",
                            value: false,
                            saveInto: local!readOnly
                          ),
                          showWhen: local!readOnly
                        )
                      },
                      width: "WIDE"
                    )
                  },
                  showWhen: not(isnull(local!selection))
                )
              }
            ),
            a!buttonLayout(
              primaryButtons: {
                a!buttonWidget(
                  label: "Update",
                  value: local!selectedEmployee,
                  saveInto: {
                    /* When the user clicks UPDATE, we use the updatearray() function to update
                       local!employees with the new values in local!selectedEmployee. */
                    a!save(
                      local!employees,
                      updatearray(
                        local!employees,
                        where(tointeger(local!employees.id)=local!selectedEmployee.id),
                        local!selectedEmployee
                      )
                    ),
                    a!save(local!readOnly, true)
                  },
                  style: "PRIMARY"
                )
              },
              secondaryButtons: {
                a!buttonWidget(
                  label: "Cancel",
                  value: true,
                  saveInto: {
                    local!readOnly,
                    /* If the user has made any changes to local!selectedEmployee, when they click
                       CANCEL, we need to reset local!selectedEmployee to previous values in local!employees
                       in order to keep the selectedEmployee details true. If you don't want to persist the
                       selection, you can simply reset the selections instead with:
                       a!save(local!selectedEmployee, null), a!save(local!selection, null) */
                    a!save(
                      local!selectedEmployee,
                      cast(typeof({a!map()}), /* Casting the value to "list of map" simplifies subsequent interactions. */
                        index(
                          local!employees,
                          where(tointeger(local!employees.id)=local!selectedEmployee.id),
                          null
                        )
                      )
                    )
                  },
                  submit: true,
                  style: "NORMAL",
                  validate: false
                )
              },
              showWhen: not(local!readOnly)
            )
          }
        )
      }
    )
  }
)