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KnockoutJS TechEd NA 2012
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John Papa
July 01, 2012
Technology
3
4.2k
KnockoutJS TechEd NA 2012
John Papa
July 01, 2012
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Transcript
None
With and Without Knockout
UI Patterns Data & Bindings Separation of Concerns Structured JavaScript
6+ 2+ Separates behavior and structure Declarative bindings Observables
data-bind="value: firstName" Declarative Binding ko.observable ko.applyBindings Create an Observable Bind
the ViewModel to the View http://jsfiddle.net/johnpapa/BEzJc/
Source object Push from Source to Target
None
With and Without Knockout Observable
Taylor 110 Taylor 914ce Taylor 914ce Taylor 110
data-bind Declarative Binding product: { id: 1001, model: ko.observable("Taylor 314ce"),
salePrice: ko.observable(1199.95) } ko.applyBindings(data); Source object Bind Source to Target, & Vice Versa
None
With and Without Knockout Observable Computed
computed dependentObservable
ko.computed this this.qty vm observables owner
None
With and Without Knockout Observable Computed ObservableArray
None
var myViewModel = { salesPerson: ko.observable("John"), empNum: ko.observable(39811), products: ko.observableArray([
{ model: "Taylor 314CE", price: 1749, id=321 }, { model: "Martin D40", price: 1899, id=479 } ]) }; <span data-bind="text: products().length"></span> Pre-populating Operating on observableArray
None
With and Without Knockout Observable Computed ObservableArray Built In Bindings
enable value options value optionsText optionsValue Built into Knockout Binding
for element attributes Multiple binding expressions
attr checked click css disable enable event hasfocus html options
optionsText optionsValue selectedOptions style submit text uniqueName value visible text value click disable enable attr Display and state bindings Text and value bindings Bindings for specific attributes visible event Event bindings
None
With and Without Knockout Observable Computed ObservableArray Built In Bindings
Templates
• If truthy condition if • If falsy condition ifnot
• Execute for each item in a list foreach • Shortcut to execute for the object with
template: {name: 'productsTmpl', foreach: lines} Pass the context for the
template with “foreach” productsTmpl
if: lines().length > 0 Any “truthy” expression
with: model text: brand text: name <div> <div data-bind="text: model().brand"></div>
<div data-bind="text: model().name"></div> </div>
None
All Part of the Native Template Engine in Knockout
None
With and Without Knockout Observable Computed ObservableArray Built In Bindings
Templates Custom Binding Handlers
None
function(element, valueAccessor function(element, valueAccessor Runs first time the binding is
evaluated Runs after init and every time one of its observables changes
element, valueAccessor, allBindingsAccessor, viewModel valueAccessor element element, valueAccessor, allBindingsAccessor, viewModel
valueAccessor element element Bound DOM element What is passed to the binding All other bindings on same element The viewmodel
None
With and Without Knockout Observable Computed ObservableArray Built In Bindings
Templates
JavaScript: The Developer Experience (DEV308) JavaScript: The Language (DEV307)
http://www.microsoft.com/visualstudio/en-us http://blogs.msdn.com/b/jasonz/ http://www.facebook.com/visualstudio http://twitter.com/#!/visualstudio Somasegar’s Blog http://blogs.msdn.com/b/somasegar/
http://northamerica.msteched.com www.microsoft.com/learning http://microsoft.com/technet http://microsoft.com/msdn
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