Back and Next Buttons

This is a simple little script for form views that replaces the functionality of the up and down scroll buttons. It changes the single-line selection of a set to the next row, so the form will display the information for that single row.

This is the script for the next button

/** Back/Next Buttons
*
* @author Tim Dudgeon ([email protected])
*/
import com.im.df.api.dml.*
import com.im.df.api.support.SelectionDescription
import com.im.ijc.core.api.util.IJCCoreUtils

// On click do evaluation:
evaluate = { widget ->
    def rs = widget.form.resultSet
    def rootVS = rs.rootVertexState
    def dataTree = rs.dataTree
    def rootEntity = dataTree.rootVertex.entity
    
    // Change the selection to the next row:
    SelectionDescription sel = rootVS.getSelection()
    if (sel.isSingleRow()) {
        SelectionDescription nextRowSel = SelectionDescription.move(sel, 1, rootVS.size)
        IJCCoreUtils.setNewSelection(rootVS, nextRowSel)
     }
}

// If the selection changed:
on_change = { widget, button ->
    def rs = widget.form.resultSet
    def rootVS = rs.rootVertexState
    def dataTree = rs.dataTree
    def rootEntity = dataTree.rootVertex.entity

    // Disable button functionality if current selection points to the last row:
    SelectionDescription sel = rootVS.getSelection()
    button.setEnabled(sel.isSingleRow() && (sel.maxSelectionIndex + 1 < rootVS.size))
}

To alter this script to be the 'back' version, simply change the line 19 to:

    SelectionDescription nextRowSel = SelectionDescription.move(sel, -1, rootVS.size)

Update disabling functionality in the way that it's not disabled at the last row but at the first:

    button.setEnabled(sel.isSingleRow() && (sel.maxSelectionIndex != 0))

Versions: This script has been tested on IJC versions 6.0