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feat(ExpressionChangedAfterItHasBeenCheckedException): more meaningful error message

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fixes #9882
This commit is contained in:
Victor Berchet
2016-07-07 17:49:01 -07:00
parent eacc9e6541
commit 2de8364de2
3 changed files with 44 additions and 18 deletions
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13
modules/@angular/core/src/linker/exceptions.ts
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@ -6,8 +6,10 @@
* found in the LICENSE file at https://angular.io/license
*/
import {UNINITIALIZED} from '../change_detection/change_detection_util';
import {BaseException, WrappedException} from '../facade/exceptions';
/**
* An error thrown if application changes model breaking the top-down data flow.
*
@ -44,9 +46,14 @@ import {BaseException, WrappedException} from '../facade/exceptions';
*/
export class ExpressionChangedAfterItHasBeenCheckedException extends BaseException {
constructor(oldValue: any, currValue: any, context: any) {
super(
`Expression has changed after it was checked. ` +
`Previous value: '${oldValue}'. Current value: '${currValue}'`);
let msg =
`Expression has changed after it was checked. Previous value: '${oldValue}'. Current value: '${currValue}'.`;
if (oldValue === UNINITIALIZED) {
msg +=
` It seems like the view has been created after its parent and its children have been dirty checked.` +
` Has it been created in a change detection hook ?`;
}
super(msg);
}
}