Ember Reusable Components and Widgets

EMBER REUSABLE
COMPONENTS
&
WIDGETS
EmberFest, Germany, 2013
brought by
Sergey N. Bolshchikov

ME
❖ Front-end engineer @ New ProImage, Israel
Allgauer Zeitung – Kempten
Rheinische Post – Dusseldorf
Druckzentrum Rhein Main – Russelsheim
Bold Printing – Sweden
News International - England
The Wall Street Journal - USA
❖ Co-organizer of Ember-IL meetup, Tel-Aviv

YOU
Heard of Web Components?
Used Ember Components?

OUTLINE
1. History Future
1.1. Web components
1.2. Ember before rc6
1.3. Ember after rc6
2. Building
2.1. Requirements
2.2. Defining components
2.3. Usage
2.4. Customization

WIDGETS?
jQuery plugins
Bootstrap

WIDGETS?
It’s all about to change
with
WEB COMPONENTS

WEB COMPONENTS :: WHY?
Global namespace collisions
No modules encapsulation
No code reuse

No code reuse
SOLVED
for JavaScript

No code reuse
What about HTML, CSS?

WEB COMPONENTS
Web Components is a
● set of specs which let web developers
● leverage their HTML, CSS and JavaScript
knowledge
● to build widgets
● that can be reused easily and reliably.*
*source: http://www.chromium.org/blink/web-components

WEB COMPONENTS in a nutshell
<element name="tick-tock-clock">
<template>
<span id="hh"></span>
<span id="sep">:</span>
<span id="mm"></span>
</template>
<script>
({
tick: function () {
…
}
});
</script>
</element>

WEB COMPONENTS
<element name="tick-tock-clock">
<template>
<span id="hh"></span>
<span id="sep">:</span>
<span id="mm"></span>
</template>
<script>
({
tick: function () {
…
}
});
</script>
</element>

WEB COMPONENTS
<html>
<body>
<tick-tock-clock></tick-tock-clock>
</body>
</html>
Usage:

ember BEFORE rc6
CONTROLLER
VIEW TEMPLATE

ember AFTER rc6
EMBER COMPONENT
VIEW CONTROLLER

EMBER COMPONENTS
● Web Component ember mock
● Real re-usable components
● By encapsulating html and javascript
● And use
<script type=”text/x-handlebars”>
{{component-name}}
</script>

EMBER COMPONENTS FOR NERDS
Ember.Component = Ember.View.extend({
init: function() {
this._super();
set(this, 'context', this);
set(this, 'controller', this);
}
});

http://jsbin.com/odUZEri/2/
CODE

TASK
Create a progress bar widget
23 / 100

1. DEFINE A TEMPLATE
<script type=”text/x-handlebars” id=”components/progress-bar”
>
<div class=”bar”>
<div class=”progress”></div>
</div>
</script>
HTML

>
</div>
</script>
HTML
a name of a template should starts with
components/ and should be dashed

HTML
a name of a template should starts with
components/ and should be dashed
progress bar
consists of outer
div as a bar with
fixed width, and
inside div with
various width in
% as a progress
>
</div>
</script>

2. USAGE
<script type=”text/x-handlebars” id=”application”>
{{progress-bar}}
</script>
HTML

3. PASSING PARAMETERS
App = Ember.Application.create({
events: 23
});
JS
<script type=”text/x-handlebars” id=”application”>
{{progress-bar progress=App.events}}
</script>
HTML

4. CUSTOMIZING COMPONENT
App.ProgressBarComponent = Ember.Components.extend({
// you code goes here
});
JS
For component customization, we inherit from the
Ember.Component and name it according to the
convention: classified name of the component with the
reserved word `Component` at the end.

4. CUSTOMIZING COMPONENT
style: function () {
return 'width: ' + this.get('progress') + '%';
}.property('App.events'),
}); JS
<script type="text/x-handlebars" id="components/progress-bar"
>
<div class="bar">
<div class="progress" {{bind-attr style=style}}></div>
</div>
</script> HTML

5. ADD CONTENT
>
<div class="bar">
<span>{{yield}}</span>
</div>
</script> HTML
<script type="text/x-handlebars" id=”application”>
{{#progress-bar progress=App.events}}
{{view.progress}} / 100
{{/progress-bar}}
</script> HTML

6. ADD ACTION
hello: function () {
console.log('hello component action');
}
}); JS
>
<div class="bar" {{action 'hello'}}>
</div>
</script> HTML

7. SEND ACTION
>
<div class="bar" {{action 'proxy'}}>
</div>
</script> HTML

7. SEND ACTION
App.ApplicationController = Ember.Controller.extend({
console.log('hello EmberFest');
}
});
App.ProgressBarComponent = Ember.Component.extend({
proxy: function () {
console.log('passing on');
this.sendAction();
},
action: 'hello'
});
JS
Hosting controller that has hello method

7. SEND ACTION
}
});
this.sendAction();
},
action: 'hello'
});
JS
Specify action name to be invoked in hosting controller

7. SEND ACTION
}
});
this.sendAction();
},
action: 'hello'
});
JS
Specify action name to be invoked in hosting controller
Invoke the specified action

TAKEAWAYS
● define template: ‘components/my-comp’
● use: {{my-comp}}
● parameterize: {{my-comp param=newPar}}
● customize: App.MyCompComponent
● be careful with {{yield}}
● sendAction method (not in guides/API)
● specify ‘action’ property in
MyCompComponent

Ember Reusable Components and Widgets

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