angular-docs-cn/packages/core/test/view/query_spec.ts

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/**
* @license
* Copyright Google Inc. All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import {ElementRef, Injector, QueryList, RenderComponentType, RootRenderer, Sanitizer, SecurityContext, TemplateRef, ViewContainerRef, ViewEncapsulation, getDebugNode} from '@angular/core';
import {getDebugContext} from '@angular/core/src/errors';
import {BindingFlags, DebugContext, NodeDef, NodeFlags, QueryBindingType, QueryValueType, RootData, Services, ViewData, ViewDefinition, ViewDefinitionFactory, ViewFlags, ViewHandleEventFn, ViewUpdateFn, anchorDef, asElementData, asProviderData, attachEmbeddedView, detachEmbeddedView, directiveDef, elementDef, queryDef, rootRenderNodes, textDef, viewDef} from '@angular/core/src/view/index';
import {inject} from '@angular/core/testing';
import {getDOM} from '@angular/platform-browser/src/dom/dom_adapter';
import {createRootView} from './helper';
export function main() {
describe(`Query Views`, () => {
function compViewDef(
nodes: NodeDef[], updateDirectives?: ViewUpdateFn, updateRenderer?: ViewUpdateFn,
viewFlags: ViewFlags = ViewFlags.None): ViewDefinition {
return viewDef(viewFlags, nodes, updateDirectives, updateRenderer);
}
function embeddedViewDef(nodes: NodeDef[], update?: ViewUpdateFn): ViewDefinitionFactory {
return () => viewDef(ViewFlags.None, nodes, update);
}
function createAndGetRootNodes(
viewDef: ViewDefinition, context: any = null): {rootNodes: any[], view: ViewData} {
const view = createRootView(viewDef, context);
const rootNodes = rootRenderNodes(view);
return {rootNodes, view};
}
const someQueryId = 1;
class AService {}
class QueryService {
a: QueryList<AService>;
}
function contentQueryProviders() {
return [
directiveDef(NodeFlags.None, null !, 1, QueryService, []),
queryDef(
NodeFlags.TypeContentQuery | NodeFlags.DynamicQuery, someQueryId,
{'a': QueryBindingType.All})
];
}
function compViewQueryProviders(extraChildCount: number, nodes: NodeDef[]) {
return [
elementDef(
NodeFlags.None, null !, null !, 1 + extraChildCount, 'div', null !, null !, null !,
null !, () => compViewDef([
queryDef(
NodeFlags.TypeViewQuery | NodeFlags.DynamicQuery, someQueryId,
{'a': QueryBindingType.All}),
...nodes
])),
directiveDef(NodeFlags.Component, null !, 0, QueryService, [], null !, null !, ),
];
}
function aServiceProvider() {
return directiveDef(
NodeFlags.None, [[someQueryId, QueryValueType.Provider]], 0, AService, []);
}
describe('content queries', () => {
it('should query providers on the same element and child elements', () => {
const {view} = createAndGetRootNodes(compViewDef([
elementDef(NodeFlags.None, null !, null !, 5, 'div'),
...contentQueryProviders(),
aServiceProvider(),
elementDef(NodeFlags.None, null !, null !, 1, 'div'),
aServiceProvider(),
]));
const qs: QueryService = asProviderData(view, 1).instance;
expect(qs.a).toBeUndefined();
Services.checkAndUpdateView(view);
const as = qs.a.toArray();
expect(as.length).toBe(2);
expect(as[0]).toBe(asProviderData(view, 3).instance);
expect(as[1]).toBe(asProviderData(view, 5).instance);
});
it('should not query providers on sibling or parent elements', () => {
const {view} = createAndGetRootNodes(compViewDef([
elementDef(NodeFlags.None, null !, null !, 6, 'div'),
aServiceProvider(),
elementDef(NodeFlags.None, null !, null !, 2, 'div'),
...contentQueryProviders(),
elementDef(NodeFlags.None, null !, null !, 1, 'div'),
aServiceProvider(),
]));
Services.checkAndUpdateView(view);
const qs: QueryService = asProviderData(view, 3).instance;
expect(qs.a.length).toBe(0);
});
});
describe('view queries', () => {
it('should query providers in the view', () => {
const {view} = createAndGetRootNodes(compViewDef([
...compViewQueryProviders(
0,
[
elementDef(NodeFlags.None, null !, null !, 1, 'span'),
aServiceProvider(),
]),
]));
Services.checkAndUpdateView(view);
const comp: QueryService = asProviderData(view, 1).instance;
const compView = asElementData(view, 0).componentView;
expect(comp.a.length).toBe(1);
expect(comp.a.first).toBe(asProviderData(compView, 2).instance);
});
it('should not query providers on the host element', () => {
const {view} = createAndGetRootNodes(compViewDef([
...compViewQueryProviders(
1,
[
elementDef(NodeFlags.None, null !, null !, 0, 'span'),
]),
aServiceProvider(),
]));
Services.checkAndUpdateView(view);
const comp: QueryService = asProviderData(view, 1).instance;
expect(comp.a.length).toBe(0);
});
});
describe('embedded views', () => {
it('should query providers in embedded views', () => {
const {view} = createAndGetRootNodes(compViewDef([
elementDef(NodeFlags.None, null !, null !, 5, 'div'),
...contentQueryProviders(),
anchorDef(NodeFlags.EmbeddedViews, null !, null !, 2, null !, embeddedViewDef([
elementDef(NodeFlags.None, null !, null !, 1, 'div'),
aServiceProvider(),
])),
...contentQueryProviders(),
]));
const childView = Services.createEmbeddedView(view, view.def.nodes[3]);
attachEmbeddedView(view, asElementData(view, 3), 0, childView);
Services.checkAndUpdateView(view);
// queries on parent elements of anchors
const qs1: QueryService = asProviderData(view, 1).instance;
expect(qs1.a.length).toBe(1);
expect(qs1.a.first instanceof AService).toBe(true);
// queries on the anchor
const qs2: QueryService = asProviderData(view, 4).instance;
expect(qs2.a.length).toBe(1);
expect(qs2.a.first instanceof AService).toBe(true);
});
it('should query providers in embedded views only at the template declaration', () => {
const {view} = createAndGetRootNodes(compViewDef([
elementDef(NodeFlags.None, null !, null !, 3, 'div'),
...contentQueryProviders(),
anchorDef(NodeFlags.EmbeddedViews, null !, null !, 0, null !, embeddedViewDef([
elementDef(NodeFlags.None, null !, null !, 1, 'div'),
aServiceProvider(),
])),
elementDef(NodeFlags.None, null !, null !, 3, 'div'),
...contentQueryProviders(),
anchorDef(NodeFlags.EmbeddedViews, null !, null !, 0),
]));
const childView = Services.createEmbeddedView(view, view.def.nodes[3]);
// attach at a different place than the one where the template was defined
attachEmbeddedView(view, asElementData(view, 7), 0, childView);
Services.checkAndUpdateView(view);
// query on the declaration place
const qs1: QueryService = asProviderData(view, 1).instance;
expect(qs1.a.length).toBe(1);
expect(qs1.a.first instanceof AService).toBe(true);
// query on the attach place
const qs2: QueryService = asProviderData(view, 5).instance;
expect(qs2.a.length).toBe(0);
});
it('should update content queries if embedded views are added or removed', () => {
const {view} = createAndGetRootNodes(compViewDef([
elementDef(NodeFlags.None, null !, null !, 3, 'div'),
...contentQueryProviders(),
anchorDef(NodeFlags.EmbeddedViews, null !, null !, 0, null !, embeddedViewDef([
elementDef(NodeFlags.None, null !, null !, 1, 'div'),
aServiceProvider(),
])),
]));
Services.checkAndUpdateView(view);
const qs: QueryService = asProviderData(view, 1).instance;
expect(qs.a.length).toBe(0);
const childView = Services.createEmbeddedView(view, view.def.nodes[3]);
attachEmbeddedView(view, asElementData(view, 3), 0, childView);
Services.checkAndUpdateView(view);
expect(qs.a.length).toBe(1);
detachEmbeddedView(asElementData(view, 3), 0);
Services.checkAndUpdateView(view);
expect(qs.a.length).toBe(0);
});
it('should update view queries if embedded views are added or removed', () => {
const {view} = createAndGetRootNodes(compViewDef([
...compViewQueryProviders(
0,
[
anchorDef(NodeFlags.EmbeddedViews, null !, null !, 0, null !, embeddedViewDef([
elementDef(NodeFlags.None, null !, null !, 1, 'div'),
aServiceProvider(),
])),
]),
]));
Services.checkAndUpdateView(view);
const comp: QueryService = asProviderData(view, 1).instance;
expect(comp.a.length).toBe(0);
const compView = asElementData(view, 0).componentView;
const childView = Services.createEmbeddedView(compView, compView.def.nodes[1]);
attachEmbeddedView(view, asElementData(compView, 1), 0, childView);
Services.checkAndUpdateView(view);
expect(comp.a.length).toBe(1);
detachEmbeddedView(asElementData(compView, 1), 0);
Services.checkAndUpdateView(view);
expect(comp.a.length).toBe(0);
});
});
describe('QueryBindingType', () => {
it('should query all matches', () => {
class QueryService {
a: QueryList<AService>;
}
const {view} = createAndGetRootNodes(compViewDef([
elementDef(NodeFlags.None, null !, null !, 4, 'div'),
directiveDef(NodeFlags.None, null !, 1, QueryService, []),
queryDef(
NodeFlags.TypeContentQuery | NodeFlags.DynamicQuery, someQueryId,
{'a': QueryBindingType.All}),
aServiceProvider(),
aServiceProvider(),
]));
Services.checkAndUpdateView(view);
const qs: QueryService = asProviderData(view, 1).instance;
expect(qs.a instanceof QueryList).toBeTruthy();
expect(qs.a.toArray()).toEqual([
asProviderData(view, 3).instance,
asProviderData(view, 4).instance,
]);
});
it('should query the first match', () => {
class QueryService {
a: AService;
}
const {view} = createAndGetRootNodes(compViewDef([
elementDef(NodeFlags.None, null !, null !, 4, 'div'),
directiveDef(NodeFlags.None, null !, 1, QueryService, []),
queryDef(
NodeFlags.TypeContentQuery | NodeFlags.DynamicQuery, someQueryId,
{'a': QueryBindingType.First}),
aServiceProvider(),
aServiceProvider(),
]));
Services.checkAndUpdateView(view);
const qs: QueryService = asProviderData(view, 1).instance;
expect(qs.a).toBe(asProviderData(view, 3).instance);
});
});
describe('query builtins', () => {
it('should query ElementRef', () => {
class QueryService {
a: ElementRef;
}
const {view} = createAndGetRootNodes(compViewDef([
elementDef(NodeFlags.None, [[someQueryId, QueryValueType.ElementRef]], null !, 2, 'div'),
directiveDef(NodeFlags.None, null !, 1, QueryService, []),
queryDef(
NodeFlags.TypeContentQuery | NodeFlags.DynamicQuery, someQueryId,
{'a': QueryBindingType.First}),
]));
Services.checkAndUpdateView(view);
const qs: QueryService = asProviderData(view, 1).instance;
expect(qs.a.nativeElement).toBe(asElementData(view, 0).renderElement);
});
it('should query TemplateRef', () => {
class QueryService {
a: TemplateRef<any>;
}
const {view} = createAndGetRootNodes(compViewDef([
anchorDef(
NodeFlags.None, [[someQueryId, QueryValueType.TemplateRef]], null !, 2, null !,
embeddedViewDef([anchorDef(NodeFlags.None, null !, null !, 0)])),
directiveDef(NodeFlags.None, null !, 1, QueryService, []),
queryDef(
NodeFlags.TypeContentQuery | NodeFlags.DynamicQuery, someQueryId,
{'a': QueryBindingType.First}),
]));
Services.checkAndUpdateView(view);
const qs: QueryService = asProviderData(view, 1).instance;
expect(qs.a.createEmbeddedView).toBeTruthy();
});
it('should query ViewContainerRef', () => {
class QueryService {
a: ViewContainerRef;
}
const {view} = createAndGetRootNodes(compViewDef([
anchorDef(
NodeFlags.EmbeddedViews, [[someQueryId, QueryValueType.ViewContainerRef]], null !, 2),
directiveDef(NodeFlags.None, null !, 1, QueryService, []),
queryDef(
NodeFlags.TypeContentQuery | NodeFlags.DynamicQuery, someQueryId,
{'a': QueryBindingType.First}),
]));
Services.checkAndUpdateView(view);
const qs: QueryService = asProviderData(view, 1).instance;
expect(qs.a.createEmbeddedView).toBeTruthy();
});
});
describe('general binding behavior', () => {
it('should report debug info on binding errors', () => {
class QueryService {
set a(value: any) { throw new Error('Test'); }
}
const {view} = createAndGetRootNodes(compViewDef([
elementDef(NodeFlags.None, null !, null !, 3, 'div'),
directiveDef(NodeFlags.None, null !, 1, QueryService, []),
queryDef(
NodeFlags.TypeContentQuery | NodeFlags.DynamicQuery, someQueryId,
{'a': QueryBindingType.All}),
aServiceProvider(),
]));
let err: any;
try {
Services.checkAndUpdateView(view);
} catch (e) {
err = e;
}
expect(err).toBeTruthy();
expect(err.message).toBe('Test');
const debugCtx = getDebugContext(err);
expect(debugCtx.view).toBe(view);
expect(debugCtx.nodeIndex).toBe(2);
});
});
});
}