Retrieving Instance of User-Interface Environment

submit.md

Retrieving Instance of User-Interface Environment

This sample script is for retrieving an instance of user-interface environment for Spreadsheet, Document and Slides. When I create applications which use user interface (for example, sidebar, dialog and so on), the user interface can be used for Spreadsheet, Document and Slides. If the application doesn't use the methods depend on Spreadsheet, Document and Slides, this script can give 3 choices to users.

function getUi() {
    var ui;
    try {
        ui = SpreadsheetApp.getUi();
    } catch(e) {}
    try {
        ui = DocumentApp.getUi();
    } catch(e) {}
    try {
        ui = SlidesApp.getUi();
    } catch(e) {}
    return ui || null;
}

function main() {
    var ui = getUi();
    if (ui) {
        ui.alert('Hello, world!');
    }
}