angular-cn/packages/common/test/directives/ng_style_spec.ts

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/**
* @license
* Copyright Google LLC 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 {CommonModule} from '@angular/common';
import {Component} from '@angular/core';
import {async, ComponentFixture, TestBed} from '@angular/core/testing';
{
describe('NgStyle', () => {
let fixture: ComponentFixture<TestComponent>;
function getComponent(): TestComponent {
return fixture.componentInstance;
}
function expectNativeEl(fixture: ComponentFixture<any>): any {
return expect(fixture.debugElement.children[0].nativeElement);
}
afterEach(() => {
fixture = null!;
});
beforeEach(() => {
TestBed.configureTestingModule({declarations: [TestComponent], imports: [CommonModule]});
});
it('should add styles specified in an object literal', async(() => {
const template = `<div [ngStyle]="{'max-width': '40px'}"></div>`;
fixture = createTestComponent(template);
fixture.detectChanges();
expectNativeEl(fixture).toHaveCssStyle({'max-width': '40px'});
}));
it('should add and change styles specified in an object expression', async(() => {
const template = `<div [ngStyle]="expr"></div>`;
fixture = createTestComponent(template);
getComponent().expr = {'max-width': '40px'};
fixture.detectChanges();
expectNativeEl(fixture).toHaveCssStyle({'max-width': '40px'});
let expr = getComponent().expr;
expr['max-width'] = '30%';
fixture.detectChanges();
expectNativeEl(fixture).toHaveCssStyle({'max-width': '30%'});
}));
it('should add and remove styles specified using style.unit notation', async(() => {
const template = `<div [ngStyle]="{'max-width.px': expr}"></div>`;
fixture = createTestComponent(template);
getComponent().expr = '40';
fixture.detectChanges();
expectNativeEl(fixture).toHaveCssStyle({'max-width': '40px'});
getComponent().expr = null;
fixture.detectChanges();
expectNativeEl(fixture).not.toHaveCssStyle('max-width');
}));
// https://github.com/angular/angular/issues/21064
it('should add and remove styles which names are not dash-cased', async(() => {
fixture = createTestComponent(`<div [ngStyle]="{'color': expr}"></div>`);
getComponent().expr = 'green';
fixture.detectChanges();
expectNativeEl(fixture).toHaveCssStyle({'color': 'green'});
getComponent().expr = null;
fixture.detectChanges();
expectNativeEl(fixture).not.toHaveCssStyle('color');
}));
it('should update styles using style.unit notation when unit changes', async(() => {
const template = `<div [ngStyle]="expr"></div>`;
fixture = createTestComponent(template);
getComponent().expr = {'max-width.px': '40'};
fixture.detectChanges();
expectNativeEl(fixture).toHaveCssStyle({'max-width': '40px'});
getComponent().expr = {'max-width.em': '40'};
fixture.detectChanges();
expectNativeEl(fixture).toHaveCssStyle({'max-width': '40em'});
}));
// keyValueDiffer is sensitive to key order #9115
it('should change styles specified in an object expression', async(() => {
const template = `<div [ngStyle]="expr"></div>`;
fixture = createTestComponent(template);
getComponent().expr = {
// height, width order is important here
height: '10px',
width: '10px'
};
fixture.detectChanges();
expectNativeEl(fixture).toHaveCssStyle({'height': '10px', 'width': '10px'});
getComponent().expr = {
// width, height order is important here
width: '5px',
height: '5px',
};
fixture.detectChanges();
expectNativeEl(fixture).toHaveCssStyle({'height': '5px', 'width': '5px'});
}));
it('should remove styles when deleting a key in an object expression', async(() => {
const template = `<div [ngStyle]="expr"></div>`;
fixture = createTestComponent(template);
getComponent().expr = {'max-width': '40px'};
fixture.detectChanges();
expectNativeEl(fixture).toHaveCssStyle({'max-width': '40px'});
delete getComponent().expr['max-width'];
fixture.detectChanges();
expectNativeEl(fixture).not.toHaveCssStyle('max-width');
}));
it('should co-operate with the style attribute', async(() => {
const template = `<div style="font-size: 12px" [ngStyle]="expr"></div>`;
fixture = createTestComponent(template);
getComponent().expr = {'max-width': '40px'};
fixture.detectChanges();
expectNativeEl(fixture).toHaveCssStyle({'max-width': '40px', 'font-size': '12px'});
delete getComponent().expr['max-width'];
fixture.detectChanges();
expectNativeEl(fixture).not.toHaveCssStyle('max-width');
expectNativeEl(fixture).toHaveCssStyle({'font-size': '12px'});
}));
it('should co-operate with the style.[styleName]="expr" special-case in the compiler',
async(() => {
const template = `<div [style.font-size.px]="12" [ngStyle]="expr"></div>`;
fixture = createTestComponent(template);
getComponent().expr = {'max-width': '40px'};
fixture.detectChanges();
expectNativeEl(fixture).toHaveCssStyle({'max-width': '40px', 'font-size': '12px'});
delete getComponent().expr['max-width'];
fixture.detectChanges();
expectNativeEl(fixture).not.toHaveCssStyle('max-width');
expectNativeEl(fixture).toHaveCssStyle({'font-size': '12px'});
}));
it('should not write to the native node unless the bound expression has changed', () => {
const template = `<div [ngStyle]="{'color': expr}"></div>`;
fixture = createTestComponent(template);
fixture.componentInstance.expr = 'red';
fixture.detectChanges();
expectNativeEl(fixture).toHaveCssStyle({'color': 'red'});
// Overwrite native styles so that we can check if ngStyle has performed DOM manupulation to
// update it.
fixture.debugElement.children[0].nativeElement.style.color = 'blue';
fixture.detectChanges();
// Assert that the style hasn't been updated
expectNativeEl(fixture).toHaveCssStyle({'color': 'blue'});
fixture.componentInstance.expr = 'yellow';
fixture.detectChanges();
// Assert that the style has changed now that the model has changed
expectNativeEl(fixture).toHaveCssStyle({'color': 'yellow'});
});
it('should correctly update style with units (.px) when the model is set to number', () => {
const template = `<div [ngStyle]="{'width.px': expr}"></div>`;
fixture = createTestComponent(template);
fixture.componentInstance.expr = 400;
fixture.detectChanges();
expectNativeEl(fixture).toHaveCssStyle({'width': '400px'});
});
});
}
@Component({selector: 'test-cmp', template: ''})
class TestComponent {
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expr: any;
}
function createTestComponent(template: string): ComponentFixture<TestComponent> {
return TestBed.overrideComponent(TestComponent, {set: {template: template}})
.createComponent(TestComponent);
}