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1、Angular2RenderDirectivesSTATUS:?DRAFTyjbanov@google.comA?render?directive?is?a?new?kind?of?directive?introduced?in?Angular?2.?It?addresses?the?need?to?implement?platformspecific?features?that?Angular?core?does?not?provide?outofthebox.?Render?directives?provide?API?to?the?developer?to?inter
2、act?directly?with?the?Render?API?and?platform?APIs,?such?as?browser?HTML?DOM?API.This?document?describes?the?design?for?render?directives?for?the?browser.?It?is?likely?that?we?will?need?a?similar?concept?for?nonbrowser?environments,?but?that?is?out?of?scope?for?this?document.?Code?samples?
3、in?this?document?are?written?in?Dart?but?apply?to?TypeScript?as?well.BackgroundDesignSelecting?NodesRenderDirective?annotationDefining?render?directivesContext?objectsValue?bindingAutopipesLifecycleEventsBackgroundAngular’s?application?layer?is?designed?to?be?platformagnostic.?This?include
4、s?DI,?directives,?change?detection?and?the?template?language.?It?does?not?mean?that?you?write?an?application?once?and?run?it?on?all?platforms.?It?means?you?learn?the?core?Angular?concepts?and?APIs?once,?and?reuse?that?knowledge?on?many?platforms.?However,?a?given?Angular?application?target
5、s?a?specific?platform,?and?therefore?needs?access?to?that?platform’s?features.?Usecases?include:Binding?to?native?properties,?such?as?“classList”?(DOMTokenList),?“style”?(CSSStyleDeclaration)?and?“attributes”?(NamedNodeMap).Animations,?overlays?and?other?styling?and?theming?aspectsCustom?d
6、ata?modelstoDOM?syncing,?for?example:Game?scene?graph?synced?to?canvasVirtualDOM?synced?to?real?HTML?DOMChart?data?synced?to?SVGDesignDefinition:?Render?directives?is?a?developerfacing?API?for?implementing?browserspecific?features?in?Angular.Render?directives?live?in?the?render?layer?and?o
7、perate?on?native?HTML?DOM?nodes?and?View?objects?as?defined?in?Angular’s?Render?API.?They?do?not?directly?participate?it?change?detection?and?dependency?injection.?The?application?is?connected?to?render?directives?through?the?Renderer,?and?can?pass?data?throug
