Associate Web Developer Cert - Outsystems

What does Outsystems provide?

OutSystems Server

Development

Admin & Ops

OutSystems Forge & Community

What is the OutSystems server?

set of servers that compiles, deploys, manages, runs, and monitors applications

the two components of development

integration studio & service studio

two components of admin and ops

service center & lifetime

service studio

low-code visual development environment that enables developers to rapidly create amazing mobile and web applications

integration studio

dev environment for integrating external resources;

integrate existing data and code as well as create .NET code extensions

service center

platform server management console;

admin console that is accessible via browser;

access to platform server configuration for admin and operations teams

lifetime

web app that manages lifecycle across environments;

extends service center's capabilities to cross environment scenarios;

complete application lifecycle management via browser

outsystems forge

source of downloadable components to help speed app delivery

what are screen actions bound to?

widgets on a screen

where can server actions be called?

in any flow

how many input and output parameters and local variables can server actions have?

multiple

do screen actions have output parameters

no

do preparations have parameters or variables

no

server actions that are set as a function are...

1. restricted to one output parameter

2. available in expressions

what is an action flow

where a piece of logic is defined

actions flows can have one of what and multiple of what

one start node

multiple end nodes and raise exceptions

what can screen actions and preparations also end with (2 things) besides end and raise exception?

destination nodes and download

can a flow have multiple exception handlers?

yes, but action and exception flows cannot intersect

what does that assign statement do?

allows setting values to variables or parameters

how are values assigned in assign statements?

top to bottom and changes occur immediately

what are some accelerators that service studio provides regarding assign statements?

auto-assign of remaining attributes

standard type-matching values suggestion

what does an if statement do?

creates a conditional branch in an action flow

what does a switch statement do?

creates conditional branching with multiple branches

how does the switch statement operate?

conditions are evaluated from first to last

only the first branch that evaluates to True is executed or the otherwise branch

and the otherwise branch is mandatory

what does a for each statement do?

allows iterating through a record list

how does a for each statement operate?

the cycle branch is followed for each record in the list

-branch must return to the for each so the loop can continue

-branch can create other conditional/alternative branches

the branch is followed after the cycle completes

what does RecordList.Current get in a for each statement

the current record being iterated within the loop

how to implement an ad-hoc loop

use the if to evaluate a loop condition

-follow a cyclic branch when condition is true

-exit the loop when condition is false

in the cyclic branch of an ad hoc loop...

branch must return to the if to continue the loop

branch can create other conditional/alternative branches

when is an exception used in a screen action?

when an operation fails unexpectedly at runtime

the execution is moved to an exception handler flow

what kind of exception handler flows can an action have?

database exception

security exceptions

custom user exceptions

how can an exception be raised?

automatically

raise exception statement

what happens when an exception is raised?

execution is moved to the handler most specific to the exception thrown

execution continues through that handler flow

how does a global exception handler get called?

if a handler doesn't exist in the current execution context, the server bubbles-up to check any outer contexts until a matching handler is found

details about the module global exception handler

located in the common flow

1 per module at most

highest possible level to bubble-up

should handle all exceptions!!!

validating user inputs help...

limit user mistakes

what are some reasons that input fields would need validated

input fields may..

have different data types

depend on other user input values

require business specific validations

does outsystems provide mechanisms to help implement input validations?

yes

T or F: outsystems provides build-in validations for input widgets

T

what are 2 of the built-in validations

mandatory fields must be filled

data type in must comply with the data type of the variables bound to the widgets

how and when are validations performed?

automatically

when data is submitted to the server

what widgets do not have validations?

link/button widgets with the navigate method

what does the validation property do on a widget?

influences how the input validation will be performed?

what are the 3 types of validations on a link or button?

server, client & server, none

what happens in a server validation?

inputs are submitted to the server

what are each input field's two runtime properties?

valid: boolean property

validationMessage: text property

-displayed in the case that input is not valid

when built-in validations are performed automatically....

valid property is auto set to false

but it still needs to be explicitly checked in the action flow

what is a custom server-side validation?

when a developer writes their own validations

-must be perform in the action flow

if the form input fields are invalid...

you should set the valid property to false and set the ValidationMessage accordingly

when should the form valid property be checked?

after all custom validations

what if one input is invalid?

the form is automatically not valid

can the form valid property be explicitly assigned?

No

are built-in validations checked on the server or client side?

client

if client side validations are valid then what happens? Invalid?

inputs are submitted to the server

user gets error message immediately

how do server side validations work?

as the server validation method

custom server-side validations can be defined

how does the none validation work?

inputs are submitted to the server

no built-in validations are performed on client or server side

custom server-side validations can be defined

when is the valid property of the input widget checked?

when rendering

if the valid property is set to false...

regular widget is displayed

specific styling is applied (red border)

displays the validation message when the input gains focus

troubleshooting is generally a combination of 2 things

debugging and monitoring

what does debugging do?

suspends code execution at given points

analyzes the value of variables

developer can execute code step by step

what is monitoring?

analyzing and correlating system logs

outsystems records events in logs like errors, slow queries, etc.

how does debugging work in service studio?

allows you to place breakpoints on elements that generate code such as action/preparation statements and screen widgets

when should you start the debugger?

before opening the app in the browser

what does service studio do when debugging?

registers the breakpoints and connects to server to stop execution

where are breakpoints listed?

in the debug panel

*note that they can be temporarily disabled or removed

what commands are available once code execution stops at a breakpoint?

-stop, continue, suspend, abort

-step over, step into, step out

what does the break on all exceptions button do?

forces the debugger to suspend the execution of threads when exceptions occur

handled or unhandled

when do you inspect the values of variables in debugging?

when code execution is stopped

T/F watches are always displayed, even if out of scope

T