angular-cn/packages/core/test/render3/query_spec.ts

862 lines
28 KiB
TypeScript

/**
* @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 {QUERY_READ_CONTAINER_REF, QUERY_READ_ELEMENT_REF, QUERY_READ_FROM_NODE, QUERY_READ_TEMPLATE_REF} from '../../src/render3/di';
import {QueryList, detectChanges} from '../../src/render3/index';
import {container, containerRefreshEnd, containerRefreshStart, elementEnd, elementStart, embeddedViewEnd, embeddedViewStart, load} from '../../src/render3/instructions';
import {query, queryRefresh} from '../../src/render3/query';
import {createComponent, createDirective, renderComponent} from './render_util';
/**
* Helper function to check if a given candidate object resembles ElementRef
* @param candidate
* @returns true if `ElementRef`.
*/
function isElementRef(candidate: any): boolean {
return candidate.nativeElement != null;
}
/**
* Helper function to check if a given candidate object resembles TemplateRef
* @param candidate
* @returns true if `TemplateRef`.
*/
function isTemplateRef(candidate: any): boolean {
return candidate.createEmbeddedView != null && candidate.createComponent == null;
}
/**
* Helper function to check if a given candidate object resembles ViewContainerRef
* @param candidate
* @returns true if `ViewContainerRef`.
*/
function isViewContainerRef(candidate: any): boolean {
return candidate.createEmbeddedView != null && candidate.createComponent != null;
}
describe('query', () => {
it('should project query children', () => {
const Child = createComponent('child', function(ctx: any, cm: boolean) {});
let child1 = null;
let child2 = null;
const Cmp = createComponent('cmp', function(ctx: any, cm: boolean) {
/**
* <child>
* <child>
* </child>
* </child>
* class Cmp {
* @ViewChildren(Child) query0;
* @ViewChildren(Child, {descend: true}) query1;
* }
*/
let tmp: any;
if (cm) {
query(0, Child, false);
query(1, Child, true);
elementStart(2, Child);
{
child1 = load(3);
elementStart(4, Child);
{ child2 = load(5); }
elementEnd();
}
elementEnd();
}
queryRefresh(tmp = load<QueryList<any>>(0)) && (ctx.query0 = tmp as QueryList<any>);
queryRefresh(tmp = load<QueryList<any>>(1)) && (ctx.query1 = tmp as QueryList<any>);
});
const parent = renderComponent(Cmp);
expect((parent.query0 as QueryList<any>).toArray()).toEqual([child1]);
expect((parent.query1 as QueryList<any>).toArray()).toEqual([child1, child2]);
});
describe('types predicate', () => {
it('should query using type predicate and read a specified token', () => {
const Child = createDirective();
let elToQuery;
/**
* <div child></div>
* class Cmpt {
* @ViewChildren(Child, {read: ElementRef}) query;
* }
*/
const Cmpt = createComponent('cmpt', function(ctx: any, cm: boolean) {
let tmp: any;
if (cm) {
query(0, Child, false, QUERY_READ_ELEMENT_REF);
elToQuery = elementStart(1, 'div', null, [Child]);
elementEnd();
}
queryRefresh(tmp = load<QueryList<any>>(0)) && (ctx.query = tmp as QueryList<any>);
});
const cmptInstance = renderComponent(Cmpt);
const qList = (cmptInstance.query as QueryList<any>);
expect(qList.length).toBe(1);
expect(isElementRef(qList.first)).toBeTruthy();
expect(qList.first.nativeElement).toEqual(elToQuery);
});
it('should query using type predicate and read another directive type', () => {
const Child = createDirective();
const OtherChild = createDirective();
let otherChildInstance;
/**
* <div child otherChild></div>
* class Cmpt {
* @ViewChildren(Child, {read: OtherChild}) query;
* }
*/
const Cmpt = createComponent('cmpt', function(ctx: any, cm: boolean) {
let tmp: any;
if (cm) {
query(0, Child, false, OtherChild);
elementStart(1, 'div', null, [Child, OtherChild]);
{ otherChildInstance = load(3); }
elementEnd();
}
queryRefresh(tmp = load<QueryList<any>>(0)) && (ctx.query = tmp as QueryList<any>);
});
const cmptInstance = renderComponent(Cmpt);
const qList = (cmptInstance.query as QueryList<any>);
expect(qList.length).toBe(1);
expect(qList.first).toBe(otherChildInstance);
});
it('should not add results to query if a requested token cant be read', () => {
const Child = createDirective();
const OtherChild = createDirective();
/**
* <div child></div>
* class Cmpt {
* @ViewChildren(Child, {read: OtherChild}) query;
* }
*/
const Cmpt = createComponent('cmpt', function(ctx: any, cm: boolean) {
let tmp: any;
if (cm) {
query(0, Child, false, OtherChild);
elementStart(1, 'div', null, [Child]);
elementEnd();
}
queryRefresh(tmp = load<QueryList<any>>(0)) && (ctx.query = tmp as QueryList<any>);
});
const cmptInstance = renderComponent(Cmpt);
const qList = (cmptInstance.query as QueryList<any>);
expect(qList.length).toBe(0);
});
});
describe('local names predicate', () => {
it('should query for a single element and read ElementRef by default', () => {
let elToQuery;
/**
* <div #foo></div>
* <div></div>
* class Cmpt {
* @ViewChildren('foo') query;
* }
*/
const Cmpt = createComponent('cmpt', function(ctx: any, cm: boolean) {
let tmp: any;
if (cm) {
query(0, ['foo'], false, QUERY_READ_FROM_NODE);
elToQuery = elementStart(1, 'div', null, null, ['foo', '']);
elementEnd();
elementStart(2, 'div');
elementEnd();
}
queryRefresh(tmp = load<QueryList<any>>(0)) && (ctx.query = tmp as QueryList<any>);
});
const cmptInstance = renderComponent(Cmpt);
const qList = (cmptInstance.query as QueryList<any>);
expect(qList.length).toBe(1);
expect(qList.first.nativeElement).toEqual(elToQuery);
});
it('should query for multiple elements and read ElementRef by default', () => {
let el1ToQuery;
let el2ToQuery;
/**
* <div #foo></div>
* <div></div>
* <div #bar></div>
* class Cmpt {
* @ViewChildren('foo,bar') query;
* }
*/
const Cmpt = createComponent('cmpt', function(ctx: any, cm: boolean) {
let tmp: any;
if (cm) {
query(0, ['foo', 'bar'], undefined, QUERY_READ_FROM_NODE);
el1ToQuery = elementStart(1, 'div', null, null, ['foo', '']);
elementEnd();
elementStart(2, 'div');
elementEnd();
el2ToQuery = elementStart(3, 'div', null, null, ['bar', '']);
elementEnd();
}
queryRefresh(tmp = load<QueryList<any>>(0)) && (ctx.query = tmp as QueryList<any>);
});
const cmptInstance = renderComponent(Cmpt);
const qList = (cmptInstance.query as QueryList<any>);
expect(qList.length).toBe(2);
expect(qList.first.nativeElement).toEqual(el1ToQuery);
expect(qList.last.nativeElement).toEqual(el2ToQuery);
});
it('should read ElementRef from an element when explicitly asked for', () => {
let elToQuery;
/**
* <div #foo></div>
* <div></div>
* class Cmpt {
* @ViewChildren('foo', {read: ElementRef}) query;
* }
*/
const Cmpt = createComponent('cmpt', function(ctx: any, cm: boolean) {
let tmp: any;
if (cm) {
query(0, ['foo'], false, QUERY_READ_ELEMENT_REF);
elToQuery = elementStart(1, 'div', null, null, ['foo', '']);
elementEnd();
elementStart(2, 'div');
elementEnd();
}
queryRefresh(tmp = load<QueryList<any>>(0)) && (ctx.query = tmp as QueryList<any>);
});
const cmptInstance = renderComponent(Cmpt);
const qList = (cmptInstance.query as QueryList<any>);
expect(qList.length).toBe(1);
expect(isElementRef(qList.first)).toBeTruthy();
expect(qList.first.nativeElement).toEqual(elToQuery);
});
it('should read ViewContainerRef from element nodes when explicitly asked for', () => {
/**
* <div #foo></div>
* class Cmpt {
* @ViewChildren('foo', {read: ViewContainerRef}) query;
* }
*/
const Cmpt = createComponent('cmpt', function(ctx: any, cm: boolean) {
let tmp: any;
if (cm) {
query(0, ['foo'], false, QUERY_READ_CONTAINER_REF);
elementStart(1, 'div', null, null, ['foo', '']);
elementEnd();
}
queryRefresh(tmp = load<QueryList<any>>(0)) && (ctx.query = tmp as QueryList<any>);
});
const cmptInstance = renderComponent(Cmpt);
const qList = (cmptInstance.query as QueryList<any>);
expect(qList.length).toBe(1);
expect(isViewContainerRef(qList.first)).toBeTruthy();
});
it('should read ViewContainerRef from container nodes when explicitly asked for', () => {
/**
* <ng-template #foo></ng-template>
* class Cmpt {
* @ViewChildren('foo', {read: ViewContainerRef}) query;
* }
*/
const Cmpt = createComponent('cmpt', function(ctx: any, cm: boolean) {
let tmp: any;
if (cm) {
query(0, ['foo'], false, QUERY_READ_CONTAINER_REF);
container(1, undefined, undefined, undefined, undefined, ['foo', '']);
}
queryRefresh(tmp = load<QueryList<any>>(0)) && (ctx.query = tmp as QueryList<any>);
});
const cmptInstance = renderComponent(Cmpt);
const qList = (cmptInstance.query as QueryList<any>);
expect(qList.length).toBe(1);
expect(isViewContainerRef(qList.first)).toBeTruthy();
});
it('should no longer read ElementRef with a native element pointing to comment DOM node from containers',
() => {
/**
* <ng-template #foo></ng-template>
* class Cmpt {
* @ViewChildren('foo', {read: ElementRef}) query;
* }
*/
const Cmpt = createComponent('cmpt', function(ctx: any, cm: boolean) {
let tmp: any;
if (cm) {
query(0, ['foo'], false, QUERY_READ_ELEMENT_REF);
container(1, undefined, undefined, undefined, undefined, ['foo', '']);
}
queryRefresh(tmp = load<QueryList<any>>(0)) && (ctx.query = tmp as QueryList<any>);
});
const cmptInstance = renderComponent(Cmpt);
const qList = (cmptInstance.query as QueryList<any>);
expect(qList.length).toBe(1);
expect(qList.first.nativeElement).toBe(null);
});
it('should read TemplateRef from container nodes by default', () => {
// http://plnkr.co/edit/BVpORly8wped9I3xUYsX?p=preview
/**
* <ng-template #foo></ng-template>
* class Cmpt {
* @ViewChildren('foo') query;
* }
*/
const Cmpt = createComponent('cmpt', function(ctx: any, cm: boolean) {
let tmp: any;
if (cm) {
query(0, ['foo'], undefined, QUERY_READ_FROM_NODE);
container(1, undefined, undefined, undefined, undefined, ['foo', '']);
}
queryRefresh(tmp = load<QueryList<any>>(0)) && (ctx.query = tmp as QueryList<any>);
});
const cmptInstance = renderComponent(Cmpt);
const qList = (cmptInstance.query as QueryList<any>);
expect(qList.length).toBe(1);
expect(isTemplateRef(qList.first)).toBeTruthy();
});
it('should read TemplateRef from container nodes when explicitly asked for', () => {
/**
* <ng-template #foo></ng-template>
* class Cmpt {
* @ViewChildren('foo', {read: TemplateRef}) query;
* }
*/
const Cmpt = createComponent('cmpt', function(ctx: any, cm: boolean) {
let tmp: any;
if (cm) {
query(0, ['foo'], false, QUERY_READ_TEMPLATE_REF);
container(1, undefined, undefined, undefined, undefined, ['foo', '']);
}
queryRefresh(tmp = load<QueryList<any>>(0)) && (ctx.query = tmp as QueryList<any>);
});
const cmptInstance = renderComponent(Cmpt);
const qList = (cmptInstance.query as QueryList<any>);
expect(qList.length).toBe(1);
expect(isTemplateRef(qList.first)).toBeTruthy();
});
it('should read component instance if element queried for is a component host', () => {
const Child = createComponent('child', function(ctx: any, cm: boolean) {});
let childInstance;
/**
* <cmpt #foo></cmpt>
* class Cmpt {
* @ViewChildren('foo') query;
* }
*/
const Cmpt = createComponent('cmpt', function(ctx: any, cm: boolean) {
let tmp: any;
if (cm) {
query(0, ['foo'], true, QUERY_READ_FROM_NODE);
elementStart(1, Child, null, null, ['foo', '']);
{ childInstance = load(2); }
elementEnd();
}
queryRefresh(tmp = load<QueryList<any>>(0)) && (ctx.query = tmp as QueryList<any>);
});
const cmptInstance = renderComponent(Cmpt);
const qList = (cmptInstance.query as QueryList<any>);
expect(qList.length).toBe(1);
expect(qList.first).toBe(childInstance);
});
it('should read directive instance if element queried for has an exported directive with a matching name',
() => {
const Child = createDirective({exportAs: 'child'});
let childInstance;
/**
* <div #foo="child" child></div>
* class Cmpt {
* @ViewChildren('foo') query;
* }
*/
const Cmpt = createComponent('cmpt', function(ctx: any, cm: boolean) {
let tmp: any;
if (cm) {
query(0, ['foo'], true, QUERY_READ_FROM_NODE);
elementStart(1, 'div', null, [Child], ['foo', 'child']);
childInstance = load(2);
elementEnd();
}
queryRefresh(tmp = load<QueryList<any>>(0)) && (ctx.query = tmp as QueryList<any>);
});
const cmptInstance = renderComponent(Cmpt);
const qList = (cmptInstance.query as QueryList<any>);
expect(qList.length).toBe(1);
expect(qList.first).toBe(childInstance);
});
it('should read all matching directive instances from a given element', () => {
const Child1 = createDirective({exportAs: 'child1'});
const Child2 = createDirective({exportAs: 'child2'});
let child1Instance, child2Instance;
/**
* <div #foo="child1" child1 #bar="child2" child2></div>
* class Cmpt {
* @ViewChildren('foo, bar') query;
* }
*/
const Cmpt = createComponent('cmpt', function(ctx: any, cm: boolean) {
let tmp: any;
if (cm) {
query(0, ['foo', 'bar'], true, QUERY_READ_FROM_NODE);
elementStart(1, 'div', null, [Child1, Child2], ['foo', 'child1', 'bar', 'child2']);
{
child1Instance = load(2);
child2Instance = load(3);
}
elementEnd();
}
queryRefresh(tmp = load<QueryList<any>>(0)) && (ctx.query = tmp as QueryList<any>);
});
const cmptInstance = renderComponent(Cmpt);
const qList = (cmptInstance.query as QueryList<any>);
expect(qList.length).toBe(2);
expect(qList.first).toBe(child1Instance);
expect(qList.last).toBe(child2Instance);
});
it('should match match on exported directive name and read a requested token', () => {
const Child = createDirective({exportAs: 'child'});
let div;
/**
* <div #foo="child" child></div>
* class Cmpt {
* @ViewChildren('foo', {read: ElementRef}) query;
* }
*/
const Cmpt = createComponent('cmpt', function(ctx: any, cm: boolean) {
let tmp: any;
if (cm) {
query(0, ['foo'], undefined, QUERY_READ_ELEMENT_REF);
div = elementStart(1, 'div', null, [Child], ['foo', 'child']);
elementEnd();
}
queryRefresh(tmp = load<QueryList<any>>(0)) && (ctx.query = tmp as QueryList<any>);
});
const cmptInstance = renderComponent(Cmpt);
const qList = (cmptInstance.query as QueryList<any>);
expect(qList.length).toBe(1);
expect(qList.first.nativeElement).toBe(div);
});
it('should support reading a mix of ElementRef and directive instances', () => {
const Child = createDirective({exportAs: 'child'});
let childInstance, div;
/**
* <div #foo #bar="child" child></div>
* class Cmpt {
* @ViewChildren('foo, bar') query;
* }
*/
const Cmpt = createComponent('cmpt', function(ctx: any, cm: boolean) {
let tmp: any;
if (cm) {
query(0, ['foo', 'bar'], undefined, QUERY_READ_FROM_NODE);
div = elementStart(1, 'div', null, [Child], ['foo', '', 'bar', 'child']);
{ childInstance = load(2); }
elementEnd();
}
queryRefresh(tmp = load<QueryList<any>>(0)) && (ctx.query = tmp as QueryList<any>);
});
const cmptInstance = renderComponent(Cmpt);
const qList = (cmptInstance.query as QueryList<any>);
expect(qList.length).toBe(2);
expect(qList.first.nativeElement).toBe(div);
expect(qList.last).toBe(childInstance);
});
it('should not add results to query if a requested token cant be read', () => {
const Child = createDirective();
/**
* <div #foo></div>
* class Cmpt {
* @ViewChildren('foo', {read: Child}) query;
* }
*/
const Cmpt = createComponent('cmpt', function(ctx: any, cm: boolean) {
let tmp: any;
if (cm) {
query(0, ['foo'], false, Child);
elementStart(1, 'div', null, null, ['foo', '']);
elementEnd();
}
queryRefresh(tmp = load<QueryList<any>>(0)) && (ctx.query = tmp as QueryList<any>);
});
const cmptInstance = renderComponent(Cmpt);
const qList = (cmptInstance.query as QueryList<any>);
expect(qList.length).toBe(0);
});
});
describe('view boundaries', () => {
it('should report results in embedded views', () => {
let firstEl;
/**
* <ng-template [ngIf]="exp">
* <div #foo></div>
* </ng-template>
* class Cmpt {
* @ViewChildren('foo') query;
* }
*/
const Cmpt = createComponent('cmpt', function(ctx: any, cm: boolean) {
let tmp: any;
if (cm) {
query(0, ['foo'], true, QUERY_READ_FROM_NODE);
container(1);
}
containerRefreshStart(1);
{
if (ctx.exp) {
let cm1 = embeddedViewStart(1);
{
if (cm1) {
firstEl = elementStart(0, 'div', null, null, ['foo', '']);
elementEnd();
}
}
embeddedViewEnd();
}
}
containerRefreshEnd();
queryRefresh(tmp = load<QueryList<any>>(0)) && (ctx.query = tmp as QueryList<any>);
});
const cmptInstance = renderComponent(Cmpt);
const qList = (cmptInstance.query as any);
expect(qList.length).toBe(0);
cmptInstance.exp = true;
detectChanges(cmptInstance);
expect(qList.length).toBe(1);
expect(qList.first.nativeElement).toBe(firstEl);
cmptInstance.exp = false;
detectChanges(cmptInstance);
expect(qList.length).toBe(0);
});
it('should add results from embedded views in the correct order - views and elements mix',
() => {
let firstEl, lastEl, viewEl;
/**
* <span #foo></span>
* <ng-template [ngIf]="exp">
* <div #foo></div>
* </ng-template>
* <span #foo></span>
* class Cmpt {
* @ViewChildren('foo') query;
* }
*/
const Cmpt = createComponent('cmpt', function(ctx: any, cm: boolean) {
let tmp: any;
if (cm) {
query(0, ['foo'], true, QUERY_READ_FROM_NODE);
firstEl = elementStart(1, 'b', null, null, ['foo', '']);
elementEnd();
container(2);
lastEl = elementStart(3, 'i', null, null, ['foo', '']);
elementEnd();
}
containerRefreshStart(2);
{
if (ctx.exp) {
let cm1 = embeddedViewStart(1);
{
if (cm1) {
viewEl = elementStart(0, 'div', null, null, ['foo', '']);
elementEnd();
}
}
embeddedViewEnd();
}
}
containerRefreshEnd();
queryRefresh(tmp = load<QueryList<any>>(0)) && (ctx.query = tmp as QueryList<any>);
});
const cmptInstance = renderComponent(Cmpt);
const qList = (cmptInstance.query as any);
expect(qList.length).toBe(2);
expect(qList.first.nativeElement).toBe(firstEl);
expect(qList.last.nativeElement).toBe(lastEl);
cmptInstance.exp = true;
detectChanges(cmptInstance);
expect(qList.length).toBe(3);
expect(qList.toArray()[0].nativeElement).toBe(firstEl);
expect(qList.toArray()[1].nativeElement).toBe(viewEl);
expect(qList.toArray()[2].nativeElement).toBe(lastEl);
cmptInstance.exp = false;
detectChanges(cmptInstance);
expect(qList.length).toBe(2);
expect(qList.first.nativeElement).toBe(firstEl);
expect(qList.last.nativeElement).toBe(lastEl);
});
it('should add results from embedded views in the correct order - views side by side', () => {
let firstEl, lastEl;
/**
* <ng-template [ngIf]="exp1">
* <div #foo></div>
* </ng-template>
* <ng-template [ngIf]="exp2">
* <span #foo></span>
* </ng-template>
* class Cmpt {
* @ViewChildren('foo') query;
* }
*/
const Cmpt = createComponent('cmpt', function(ctx: any, cm: boolean) {
let tmp: any;
if (cm) {
query(0, ['foo'], true, QUERY_READ_FROM_NODE);
container(1);
}
containerRefreshStart(1);
{
if (ctx.exp1) {
let cm1 = embeddedViewStart(0);
{
if (cm1) {
firstEl = elementStart(0, 'div', null, null, ['foo', '']);
elementEnd();
}
}
embeddedViewEnd();
}
if (ctx.exp2) {
let cm1 = embeddedViewStart(1);
{
if (cm1) {
lastEl = elementStart(0, 'span', null, null, ['foo', '']);
elementEnd();
}
}
embeddedViewEnd();
}
}
containerRefreshEnd();
queryRefresh(tmp = load<QueryList<any>>(0)) && (ctx.query = tmp as QueryList<any>);
});
const cmptInstance = renderComponent(Cmpt);
const qList = (cmptInstance.query as any);
expect(qList.length).toBe(0);
cmptInstance.exp2 = true;
detectChanges(cmptInstance);
expect(qList.length).toBe(1);
expect(qList.last.nativeElement).toBe(lastEl);
cmptInstance.exp1 = true;
detectChanges(cmptInstance);
expect(qList.length).toBe(2);
expect(qList.first.nativeElement).toBe(firstEl);
expect(qList.last.nativeElement).toBe(lastEl);
});
it('should add results from embedded views in the correct order - nested views', () => {
let firstEl, lastEl;
/**
* <ng-template [ngIf]="exp1">
* <div #foo></div>
* <ng-template [ngIf]="exp2">
* <span #foo></span>
* </ng-template>
* </ng-template>
* class Cmpt {
* @ViewChildren('foo') query;
* }
*/
const Cmpt = createComponent('cmpt', function(ctx: any, cm: boolean) {
let tmp: any;
if (cm) {
query(0, ['foo'], true, QUERY_READ_FROM_NODE);
container(1);
}
containerRefreshStart(1);
{
if (ctx.exp1) {
let cm1 = embeddedViewStart(0);
{
if (cm1) {
firstEl = elementStart(0, 'div', null, null, ['foo', '']);
elementEnd();
container(1);
}
containerRefreshStart(1);
{
if (ctx.exp2) {
let cm2 = embeddedViewStart(0);
{
if (cm2) {
lastEl = elementStart(0, 'span', null, null, ['foo', '']);
elementEnd();
}
}
embeddedViewEnd();
}
}
containerRefreshEnd();
}
embeddedViewEnd();
}
}
containerRefreshEnd();
queryRefresh(tmp = load<QueryList<any>>(0)) && (ctx.query = tmp as QueryList<any>);
});
const cmptInstance = renderComponent(Cmpt);
const qList = (cmptInstance.query as any);
expect(qList.length).toBe(0);
cmptInstance.exp1 = true;
detectChanges(cmptInstance);
expect(qList.length).toBe(1);
expect(qList.first.nativeElement).toBe(firstEl);
cmptInstance.exp2 = true;
detectChanges(cmptInstance);
expect(qList.length).toBe(2);
expect(qList.first.nativeElement).toBe(firstEl);
expect(qList.last.nativeElement).toBe(lastEl);
});
it('should support combination of deep and shallow queries', () => {
/**
* <ng-template [ngIf]="exp">
* <div #foo></div>
* </ng-template>
* <span #foo></span>
* class Cmpt {
* @ViewChildren('foo') query;
* }
*/
const Cmpt = createComponent('cmpt', function(ctx: any, cm: boolean) {
let tmp: any;
if (cm) {
query(0, ['foo'], true, QUERY_READ_FROM_NODE);
query(1, ['foo'], false, QUERY_READ_FROM_NODE);
container(2);
elementStart(3, 'span', null, null, ['foo', '']);
elementEnd();
}
containerRefreshStart(2);
{
if (ctx.exp) {
let cm1 = embeddedViewStart(0);
{
if (cm1) {
elementStart(0, 'div', null, null, ['foo', '']);
elementEnd();
}
}
embeddedViewEnd();
}
}
containerRefreshEnd();
queryRefresh(tmp = load<QueryList<any>>(0)) && (ctx.deep = tmp as QueryList<any>);
queryRefresh(tmp = load<QueryList<any>>(1)) && (ctx.shallow = tmp as QueryList<any>);
});
const cmptInstance = renderComponent(Cmpt);
const deep = (cmptInstance.deep as any);
const shallow = (cmptInstance.shallow as any);
expect(deep.length).toBe(1);
expect(shallow.length).toBe(1);
cmptInstance.exp = true;
detectChanges(cmptInstance);
expect(deep.length).toBe(2);
expect(shallow.length).toBe(1);
cmptInstance.exp = false;
detectChanges(cmptInstance);
expect(deep.length).toBe(1);
expect(shallow.length).toBe(1);
});
});
describe('observable interface', () => {
it('should allow observing changes to query list', () => {
const queryList = new QueryList();
let changes = 0;
queryList.changes.subscribe({
next: (arg) => {
changes += 1;
expect(arg).toBe(queryList);
}
});
// initial refresh, the query should be dirty
queryRefresh(queryList);
expect(changes).toBe(1);
// refresh without setting dirty - no emit
queryRefresh(queryList);
expect(changes).toBe(1);
// refresh with setting dirty - emit
queryList.setDirty();
queryRefresh(queryList);
expect(changes).toBe(2);
});
});
});