navigation.js

/// <reference path="../lib/jquery-1.8.2.min" />
/// <reference path="../lib/angular.js" />
/// <reference path="../src/constants.js"/>
/// <reference path="../src/namespace.js" />
/// <reference path="../src/utils.jsjs"/>
/// <reference path="classes/grid.js" />
//set event binding on the grid so we can select using the up/down keys
window.kg.moveSelectionHandler = function(grid, evt) {
    // null checks 
    if (window.kg.utils.isNullOrUndefined(grid) || window.kg.utils.isNullOrUndefined(grid.config.selectedItems)) {
        return true;
    }
    var charCode = evt.which || evt.keyCode,
        // detect which direction for arrow keys to navigate the grid
        offset = (charCode === 38 ? -1 : (charCode === 40 ? 1 : null));
    if (!offset) {
        return true;
    }
    var items = grid.renderedRows(),
        index = items.indexOf(grid.selectionService.lastClickedRow) + offset;
    if (index < 0 || index >= items.length) {
        return true;
    }
grid.selectionService.ChangeSelection(items[index], evt);
    if (index > items.length - EXCESS_ROWS) {
        grid.$viewport.scrollTop(grid.$viewport.scrollTop() + (grid.config.rowHeight * EXCESS_ROWS));
    } else if (index < EXCESS_ROWS) {
        grid.$viewport.scrollTop(grid.$viewport.scrollTop() - (grid.config.rowHeight * EXCESS_ROWS));
    }
    return false;
};