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fix(forms): change Array.reduce usage to Array.forEach (#35349)

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There is currently a bug in Chrome 80 that makes Array.reduce
not work according to spec. The functionality in forms that
retrieves controls from FormGroups and FormArrays (`form.get`)
relied on Array.reduce, so the Chrome bug broke forms for
many users.

This commit refactors our forms code to rely on Array.forEach
instead of Array.reduce to fix forms while we are waiting
for the Chrome fix to go live.

See https://bugs.chromium.org/p/chromium/issues/detail?id=1049982.

PR Close #35349
This commit is contained in:
Kara Erickson
2020-02-11 15:18:32 -08:00
parent a245e9d0a3
commit 554c2cbd5c
2 changed files with 22 additions and 14 deletions
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24
packages/forms/src/model.ts
View File

@ -52,17 +52,21 @@ function _find(control: AbstractControl, path: Array<string|number>| string, del
} }
if (Array.isArray(path) && path.length === 0) return null; if (Array.isArray(path) && path.length === 0) return null;
return path.reduce((v: AbstractControl | null, name) => { // Not using Array.reduce here due to a Chrome 80 bug
if (v instanceof FormGroup) { // https://bugs.chromium.org/p/chromium/issues/detail?id=1049982
return v.controls.hasOwnProperty(name as string) ? v.controls[name] : null; let controlToFind: AbstractControl|null = control;
path.forEach((name: string | number) => {
if (controlToFind instanceof FormGroup) {
controlToFind = controlToFind.controls.hasOwnProperty(name as string) ?
controlToFind.controls[name] :
null;
} else if (controlToFind instanceof FormArray) {
controlToFind = controlToFind.at(<number>name) || null;
} else {
controlToFind = null;
} }
});
if (v instanceof FormArray) { return controlToFind;
return v.at(<number>name) || null;
}
return null;
}, control);
} }
function coerceToValidator( function coerceToValidator(

12
packages/forms/src/validators.ts
View File

@ -465,9 +465,13 @@ function _executeAsyncValidators(control: AbstractControl, validators: AsyncVali
} }
function _mergeErrors(arrayOfErrors: ValidationErrors[]): ValidationErrors|null { function _mergeErrors(arrayOfErrors: ValidationErrors[]): ValidationErrors|null {
const res: {[key: string]: any} = let res: {[key: string]: any} = {};
arrayOfErrors.reduce((res: ValidationErrors | null, errors: ValidationErrors | null) => {
return errors != null ? {...res !, ...errors} : res !; // Not using Array.reduce here due to a Chrome 80 bug
}, {}); // https://bugs.chromium.org/p/chromium/issues/detail?id=1049982
arrayOfErrors.forEach((errors: ValidationErrors | null) => {
res = errors != null ? {...res !, ...errors} : res !;
});
return Object.keys(res).length === 0 ? null : res; return Object.keys(res).length === 0 ? null : res;
} }