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Directives & Components Anton Korniychuk

Annotations

read

@ViewChild('myname', { read: ViewContainerRef }) target; - ViewContainerRef - ElementRef - Component or Directive name

descendants

@ContentChildren() // is the only one that allows to also query for descendants @ContentChildren(SomeTypeOrVarName, {descendants: true}) someField; *true // for ViewChild & ViewChildren *false // for ContentChild & ContentChildren

@ViewChild() // supports directive or component type as parameter, or the name (string) of a template variable. @ViewChildren() // also supports a list of names as comma separated list (currently no spaces allowed @ViewChildren('var1,var2,var3')). @ContentChild() and @ContentChildren() // do the same but in the light DOM ( projected elements).

examples

// html // annotations @ViewChild(MyComponent) component: MyComponent; @ViewChild(MyDirective) directive: MyDirective; @ViewChild('domElName') el: ElementRef; @ViewChild('domElName', { read: ViewContainerRef }) ref: ViewContainerRef;

{{ message }}

// hello

// html // annotation @ViewChild('myname') input; // value ngAfterViewInit() { console.log(this.input.nativeElement.value); }

Services

TemplateRef ViewContainerRef ElementRef

Component

ng-content ng-container ng-template template // deprecated