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fix(common): add link to trackBy docs (#13634)

This commit is contained in:
Dzmitry Shylovich 2016-12-23 00:25:51 +03:00 committed by Hans
parent 0448e80704
commit 697690349f
1 changed files with 2 additions and 1 deletions
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3
modules/@angular/common/src/directives/ng_for.ts
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@ -92,7 +92,8 @@ export class NgFor implements DoCheck, OnChanges {
@Input() @Input()
set ngForTrackBy(fn: TrackByFn) { set ngForTrackBy(fn: TrackByFn) {
if (typeof fn !== 'function') { if (typeof fn !== 'function') {
throw new Error(`trackBy must be a function, but received ${JSON.stringify(fn)}`); throw new Error(`trackBy must be a function, but received ${JSON.stringify(fn)}.
See https://angular.io/docs/ts/latest/api/common/index/NgFor-directive.html#!#change-propagation for more information.`);
} }
this._trackByFn = fn; this._trackByFn = fn;
} }