Cookbook

Concrete problems and their solutions, one chapter each, grouped by what an app is made of. The Cheat Sheet is the checklist to keep open while working; the groups below are where each rule on it is explained in full. Every word the chapters rely on is defined in the Glossary.

I Want To…

I want to…	Go to
build a first screen	Definition → Sending a View
find the right control	Definition → Choosing a Control
show a value, or let the user edit it	Binding
format a date, a time or an amount	Formatter
show an internal table	Tables → Basic Table
know which table row was clicked	Tables → Which Row Was Clicked
sort or filter a table	Tables → Sorting and Filtering
show more than 100 rows	More than 100 Rows
react to a button	Backend → Basic
send a value with an event	Backend → Sending a Value with the Event
do something in the browser without a roundtrip	Frontend Actions
understand why my view is blank after a return	App Structure
switch between two screens	Inner App → Within One Class
call another app and get a result back	Inner App → Handing a Result Back
make the browser's Back button work	URL Hash and Routing
give the user a link to the current state	App State
open and close a popup	Popup
ask a yes/no question	Message → the parameters
show a toast, an error or a BAPIRET table	Message
handle an exception	Errors and Exceptions
set the focus	Focus
refresh the screen every few seconds	Timer
upload or download a file	Upload, Download
keep two users from overwriting each other	Lock → Which Strategy?
read and change a RAP business object	EML
find out why something does not work	Common Failures

The Groups

Group	What it covers	Start with
View	Building the view in ABAP, nested views, XML templating	Building a View
Model	Binding, expression binding and formatters, tables, trees, the device model, the size limit	Binding
Event, Navigation	The life cycle, backend and frontend actions, navigation inside and between apps, the hash and the app state, exceptions	App Structure
Popup, Popover	Dialogs and popovers as fragments of their own	Popup
Translation, Messages	Messages, logging, translation with i18n	Message
Browser Interaction	The title, focus, scrolling, timers, the clipboard, URL handling, the soft keyboard, keyboard shortcuts	Title
Device Capabilities	What the frontend reports about itself, camera, geolocation, barcode scanning, audio and video, upload and download, PDF, spreadsheets	Frontend Info
State, Connectivity	Locks, statefulness, WebSocket, OData, smart controls	Lock
EML, CDS, SQL	RAP, EML, RAP draft handling, CDS, ABAP SQL	RAP
Patterns, Helpers	Snippets, value help, demo output, e-mail, fuzzy search	Snippets
Troubleshooting	The failures that come up most, and what each one means	Common Failures