Building web apps with Vaadin 8

B U I L D I N G W E B A P P S I N J A V A
@ M A R C U S H E L L B E R G
5
S T O R Y A N D P H I L O S O P H Y
Software is eating the world and what most of us see of it is the user interface. The user
interface has become the key component of how the users experience the business
behind it. Competition is lost or won due to user experience. Simplicity is king and the
users get frustrated by anything ugly, slow or not working on the device they happen to
use at the time. We at Vaadin fight for simplicity and invite everyone to join this fight.
Together we want to build a user interface that puts a smile on the user’s face.
Vaadin is the technology that empowers developers to build the best web-apps for
business purposes. Our priority over everything else is developer productivity because
we believe that by simplifying the developer experience and saving the developer’s
time, they are best able to focus on building great user interfaces.
Our brand is what we want everyone to think about us. When everyone - both us and
the people around us - have a consistent understanding of what Vaadin is and what we
stand for, it enables that image to spread and amplify. This book defines what we want
that image to be. It defines what the Vaadin brand is.
I hope that You are as excited and proud of living and breathing the Vaadin brand as
I am. You are the one who is shaping what everyone thinks about Vaadin - using this
brand as a tool and a guideline every day.
Let’s fight for simplicity for both the users and the developers!
Joonas Lehtinen
Founder & CEO
Vaadin
I N T R O D U C T I O N

150k+ active developers
Apache 2.0

40% of Fortune 100 companies use Vaadin
Apache 2.0

40% of Fortune 100 companies use Vaadin
#2 Java Web Framework
according to Open HUB stats
Apache 2.0

things you'll learn
1. What it takes to build a modern web app
2. The building blocks of Vaadin
3. How to build a full stack app in 30 minutes

Building web apps with Vaadin 8

MyController.java
@RestController
@RequestMapping("/analytics")
public class AnalyticsController {
@Autowired
PatientsRepository patientsRepository;
@RequestMapping(path = "/age",
method = RequestMethod.GET)
public Response getByAge() {
...
}
@RequestMapping(path = "/length",
public Response getByLength() {
...
}
...

MyController.java
my-view.template.html
@RestController
@Autowired
...
}
...
}
...

MyController.java
@RestController
@Autowired
...
}
...
}
...
<nav>
<a href="/analytics/age" routerLink
<a href="/analytics/doctor" routerL
<a href="/analytics/gender" routerL
</nav>
...

MyController.java
my-view.css
@RestController
@Autowired
...
}
...
}
...
<nav>
</nav>
...

MyController.java
my-view.css
@RestController
@Autowired
...
}
...
}
...
<nav>
</nav>
...
nav {
justify-content: center;
text-transform: uppercase;
margin-bottom: 50px;
} ...

MyController.java
my-view.css
my-view.js
@RestController
@Autowired
...
}
...
}
...
<nav>
</nav>
...
nav {
} ...

MyController.java
my-view.css
my-view.js
@RestController
@Autowired
...
}
...
}
...
<nav>
</nav>
...
nav {
} ...
getAnalytics(grouping: string = 'age'
return this.http
.get(`${this.config.API_URL}/analy
.map(res=>res.json());
}

F I G H T F O R S I M P L I C I T Y

new TextField();
new Button("Click me");

new HorizontalLayout(
new TextField(),
new Button("Click me")
);

new VerticalLayout(
new TextField(),
new Button("Click me")
);

layout = new VerticalLayout();
textField = new TextField();
button = new Button("Click Me");

layout = new VerticalLayout();
textField = new TextField();
button = new Button("Click Me");
button.addClickListener(click ->
layout.addComponent(
new Label(textField.getValue())
));

private TextField firstName;
private TextField lastName;

person = new Person();

binder = new BeanBinder<>(
Person.class);

Person.class);
binder.bindInstanceFields(this);

save = new Button("Save", e -> {
// try-catch
binder.writeBean(person);
Notification.show(
person.toString());
});
Person.class);
binder.bindInstanceFields(this);

@Autowired
private PersonService service;

@Autowired
Grid<Person> grid = new Grid<>();

@Autowired
grid.addColumn("First name",
Person::getFirstName);
grid.addColumn("Last name",
Person::getLastName);
grid.addColumn("Email",
Person::getEmail);

@Autowired
Person::getEmail);
grid.setItems(service.getPeople());

Person::getEmail);

Person::getEmail);
grid.setDataSource(
new BackEndDataSource<>(
q -> service.getPeople(
q.getOffset(),
q.getLimit())
.stream(),
q -> service.count()));

navBar = new HorizontalLayout();
navBar.addComponent(
new Button("view1",
click -> nav.navigateTo("")));
new Button("view2",
click -> nav.navigateTo("view2")));

new Button("view1",
new Button("view2",
CssLayout navOutlet = new CssLayout();
addComponents(navBar, navOutlet);

nav = new Navigator(this, navOutlet);
nav.addView("",
new DemoView("Hello, I'm view 1"));
nav.addView("view2",
new DemoView("Hello, I'm view 2"));
new Button("view1",
new Button("view2",
CssLayout navOutlet = new CssLayout();
addComponents(navBar, navOutlet);

$v-background-color:
hsl(210, 0%, 100%);

hsl(210, 0%, 33%);

hsl(210, 0%, 100%);
$v-border: 2px solid v-shade;
$v-border-radius: 0;
$v-bevel: false;
$v-gradient: false;
$v-shadow: false;

github.com/vaadin-marcus/spring-boot-todo

TextField name = new TextField();
Button button = new Button("Greet");
layout.addComponents(name, button);
button.addClickListener(click -> {
Notification.show("Hi, " + name.getValue());
});

Initial HTML
CSS
JavaScript
~300k

{name: {value: 'Marcus'},
button: {event: 'clicked'}}
261 bytes

{name: {value: 'Marcus'},
button: {event: 'clicked'}}
261 bytes 
{new: [
{notification: 'Hi, Marcus'}
]}
267 bytes

.v-ui[width-range~="0-800px"]{
/* Styles for small devices */
}
.v-ui[width-range~="801px-"]{
/* Styles for large devices */
}

.v-ui[width-range~="0-800px"]{
/* Styles for small devices */
}
.v-ui[width-range~="801px-"]{
/* Styles for large devices */
}
getPage().addBrowserWindowResizeListener( newSize -> {
if (newSize.getWidth() > LARGE_DEVICE_WIDTH){
setupLargeLayout();
} else {
setupSmallLayout();
}
});

W E B S O C K E T S
public class VaadinUI extends UI {
...
}

W E B S O C K E T S
...
}
@Push

W E B S O C K E T S
...
}
@Push
ui.access(() -> Notification.show("Alert!"));

T H A N K YO U
@ M A R C U S H E L L B E R G
5
S T O R Y A N D P H I L O S O P H Y
Software is eating the world and what most of us see of it is the user interface. The user
interface has become the key component of how the users experience the business
behind it. Competition is lost or won due to user experience. Simplicity is king and the
users get frustrated by anything ugly, slow or not working on the device they happen to
use at the time. We at Vaadin fight for simplicity and invite everyone to join this fight.
Together we want to build a user interface that puts a smile on the user’s face.
Vaadin is the technology that empowers developers to build the best web-apps for
business purposes. Our priority over everything else is developer productivity because
we believe that by simplifying the developer experience and saving the developer’s
time, they are best able to focus on building great user interfaces.
Our brand is what we want everyone to think about us. When everyone - both us and
the people around us - have a consistent understanding of what Vaadin is and what we
stand for, it enables that image to spread and amplify. This book defines what we want
that image to be. It defines what the Vaadin brand is.
I hope that You are as excited and proud of living and breathing the Vaadin brand as
I am. You are the one who is shaping what everyone thinks about Vaadin - using this
brand as a tool and a guideline every day.
Let’s fight for simplicity for both the users and the developers!
Joonas Lehtinen
Founder & CEO
Vaadin
I N T R O D U C T I O N

Building web apps with Vaadin 8

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Building web apps with Vaadin 8