Ember Views - Speaker Deck

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Ember Views June 2012 Ray Cohen Developer @ Boxee

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from

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Basics

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Basics

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Same as

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Basics • A template is a function that builds a string • Handlebars compiles strings to templates • templateName is a key into Ember.TEMPLATES

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Binding values to DOM

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Binding values to DOM

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{{bound}} and {{unbound}}

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Escaped by default

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Binding element properties Need another way FAIL

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{{bindAttr}} helper

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Helpers • Functions invoked by {{fn-name params}} • Invoked during view render • Output a string to the buffer • Can set up property observers

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The {{#if}} helper `#` before helper name: takes a block

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How {{#if}} works • Create metamorph view • Observe App.loggedIn • On change, switch template Blocks become templates

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The {{view}} helper

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The {{#view}} helper

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The {{#view}} helper Behind the scenes

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Ember.ContainerView • Templates can’t always describe all UI • Sometimes more ﬂexibility is required • ContainerView holds other view instances, allows code to add, remove, reorder • set currentView property • or manage childViews array

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Something is missing

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context keywords so far we’ve been dodging this topic with globals like App.team

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Old way: view is context TL;DR

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view keyword 0.9 1.0 beta

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Setting context: {{#with}}

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Setting context: {{#each}}

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Setting context: {{view}} When?

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Controllers 1.0 beta

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Setting context: {{view}} If available, use controller as context otherwise, use existing context.

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Result • Controller is context for a chunk of DOM • Controller is good place to have properties that many views access • Reduces need to bind lots of values to the views themselves • Moving things around in templates is easier

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Setting keywords

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Setting keywords

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Creating helpers • Main issue is having bindings work within your helper’s output • Easiest path: call one of the other helpers from your helper after some setup • Future: easier ability to bind some types of helpers (see PR 615)

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Example: {{outlet}}

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Example: {{outlet}}

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Event Delegation & Lifecycle hooks

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Event Delegation

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Event Delegation rootElement.delegate(...)

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didInsert and willDestroy jQuery!

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Mixins are _super()

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Example Mixin

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Example Mixin

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Inﬁnite Scroll don’t forget to call _super()

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Resources • emberjs.com/guides/ • emberist.com/ - Peter Wagenet’s blog • IRC - #emberjs on Freenode • bring your jsﬁddle!

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Thanks! @raycohen