html - Angular2: File input control label keeps its state after destroying component -

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i have angular2 component (lets call dataset-create) includes form:

<form novalidate="novalidate">     <button type="button" (click)="onclose()">close</button>     <button type="submit" (click)="onsubmit()">submit</button>     <label for="datafiled">data</label>     <input id="datafiled" type="file" (change)="onfilechange($event)"> </form>

the close() , submit() functions emit (close) event makes parent component disable dataset-create component:

<div [ngswitch]="mode">     <template [ngswitchwhen]="'create'">         <dataset-create [dataset]="dataset" (close)="ondatasetformclose()"></dataset-create>     </template>     <template [ngswitchwhen]="'detail'">         <dataset-detail [dataset]="dataset" (close)="ondatasetformclose()"></dataset-detail>     </template> </div>

this done bone binding emitted (close) event of dataset-create component following function in parent component:

private ondatasetformclose() {     this.mode = "list"; }

so here first question: every time mode variable toggles between 'create' , else dataset-create component created , destroyed. correct? correct! verified adding console.log("foo"); in constuctor on dataset-create component.

here problem now: if above correct, why label of file input keeps it's value after submitting (thus destroying dataset-create component) form?

to make things more clear here steps follow:

  • i set somehow mode variable 'create'. dataset-create component constructed. file input button has label no file chosen.
  • i click file input button , choose file (lets say, foo.png). file input label has label foo.png.
  • i click submit button on form. dataset-create component destroyed.
  • i set somehow mode variable 'create'. dataset-create component constructed. the file input button has label foo.png. why? why label of file input control keeps previous state?

as suggested @astrone

this behavior until beta.0. angular2 used reuse created dom (see #4478, #5188, among others). workaround had use app_view_pool_capacity tell angular2 not cache dom.

since beta.1 no longer issue, , using app_view_pool_capacity no longer necessary. part of #5993 every dom node recreated propertly (see @tbosch's comment).


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