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fix: answer DOM probes on NativeScriptDocument instead of throwing by edusperoni · Pull Request #176 · NativeScript/angular · GitHub
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fix: answer DOM probes on NativeScriptDocument instead of throwing #176

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edusperoni merged 1 commit into from
Aug 17, 2026
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fix: answer DOM probes on NativeScriptDocument instead of throwing #176

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fix: answer DOM probes on NativeScriptDocument instead of throwing 
* Angular discovers some optional configuration by reading the DOM. The
  CSP_NONCE default factory, for example, evaluates
  `DOCUMENT.body.querySelector('[ngCspNonce]')`. `NativeScriptDocument.body`
  was a hollow object, so the optional chaining in those probes did not help
  and they failed with `body?.querySelector is not a function`. Signal forms
  reach this on the first `[formField]` binding, which crashed every
  signal-form dialog at construction.
* `querySelector`, `querySelectorAll`, `getElementById`,
  `getElementsByTagName` and `getElementsByClassName` now answer "nothing
  found" on the document and on `body`/`head`. `createElement` still throws,
  since constructing real nodes is a caller bug rather than a probe.
* CSP_NONCE is also provided as `null`, as there is no CSP in a NativeScript
  runtime. It has to be a root provider: the root injector resolves
  `providedIn: 'root'` tokens itself before consulting the platform injector,
  so providing it in COMMON_PROVIDERS would have had no effect.
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@edusperoni
edusperoni committed Aug 17, 2026
commit ec95731af050b96db4516e20ad7de298fdf585cb
6 changes: 5 additions & 1 deletion packages/angular/src/lib/nativescript.ts
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
import { IMAGE_CONFIG, ViewportScroller, XhrFactory, ɵNullViewportScroller as NullViewportScroller } from '@angular/common';
import { ApplicationModule, ErrorHandler, Inject, NgModule, NO_ERRORS_SCHEMA, Optional, Provider, RendererFactory2, SkipSelf, StaticProvider, ɵINJECTOR_SCOPE as INJECTOR_SCOPE } from '@angular/core';
import { ApplicationModule, CSP_NONCE, ErrorHandler, Inject, NgModule, NO_ERRORS_SCHEMA, Optional, Provider, RendererFactory2, SkipSelf, StaticProvider, ɵINJECTOR_SCOPE as INJECTOR_SCOPE } from '@angular/core';
import { Color, Device, View } from '@nativescript/core';
import { AppHostView } from './app-host-view';
import { NativescriptXhrFactory } from './nativescript-xhr-factory';
Expand Down Expand Up @@ -39,6 +39,10 @@ export const NATIVESCRIPT_MODULE_STATIC_PROVIDERS: StaticProvider[] = [
{ provide: NAMESPACE_FILTERS, useClass: PlatformNamespaceFilter, deps: [DEVICE], multi: true },
{ provide: DEVICE, useValue: Device },
{ provide: XhrFactory, useClass: NativescriptXhrFactory, deps: [] },
// No CSP in a NativeScript runtime. Providing it also stops the token's default
// factory reading `DOCUMENT.body.querySelector()`. Must stay root-scoped: the root
// injector resolves `providedIn: 'root'` tokens before consulting the platform.
{ provide: CSP_NONCE, useValue: null },
];
export const NATIVESCRIPT_MODULE_PROVIDERS: Provider[] = [
{ provide: ViewportScroller, useClass: NullViewportScroller },
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29 changes: 29 additions & 0 deletions packages/angular/src/lib/platform-nativescript.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -37,12 +37,41 @@ export class NativeScriptSanitizer extends Sanitizer {
// };
// }

/**
* Angular probes the DOM to discover optional configuration it may have been handed
* out of band - a `ngCspNonce` attribute on `<body>`, a transfer state `<script>` in
* the document. None of that can exist here, so the lookups answer "nothing found".
* Leaving the methods undefined instead surfaces as a `TypeError` thrown from deep
* inside framework code, since `document.body` is present and merely hollow.
*/
const NO_DOM_QUERIES = {
querySelector: () => null,
querySelectorAll: () => [],
getElementById: () => null,
getElementsByTagName: () => [],
getElementsByClassName: () => [],
getAttribute: () => null,
hasAttribute: () => false,
};

export class NativeScriptDocument {
// Required by the AnimationDriver
public body: any = {
isOverride: true,
...NO_DOM_QUERIES,
};

public head: any = {
...NO_DOM_QUERIES,
};

public querySelector = NO_DOM_QUERIES.querySelector;
public querySelectorAll = NO_DOM_QUERIES.querySelectorAll;
public getElementById = NO_DOM_QUERIES.getElementById;
public getElementsByTagName = NO_DOM_QUERIES.getElementsByTagName;
public getElementsByClassName = NO_DOM_QUERIES.getElementsByClassName;

// Deliberately still throws: constructing real nodes is a caller bug, not a probe.
createElement(tag: string) {
throw new Error('NativeScriptDocument is not DOM Document. There is no createElement() method.');
}
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