大橙子网站建设,新征程启航
为企业提供网站建设、域名注册、服务器等服务
这篇文章给大家分享的是有关Angular中模板语法有哪些的内容。小编觉得挺实用的,因此分享给大家做个参考,一起跟随小编过来看看吧。
创新互联建站专注于石河子企业网站建设,成都响应式网站建设公司,商城网站制作。石河子网站建设公司,为石河子等地区提供建站服务。全流程按需定制制作,专业设计,全程项目跟踪,创新互联建站专业和态度为您提供的服务
test-interpolation.component.ts
@Component({ selector: 'app-test-interpolation', templateUrl: './test-interpolation.component.html', styleUrls: ['./test-interpolation.component.css'] }) export class TestInterpolationComponent implements OnInit { title = '插值表达式'; constructor() { } ngOnInit() { } getValue(): string { return '值'; } }
test-interpolation.component.html
基插值语法欢迎来到 {{title}}!
2+2 = {{2 + 2}}
调用方法{{getValue()}}
test-template-variables.component.ts
@Component({ selector: 'app-test-template-variables', templateUrl: './test-template-variables.component.html', styleUrls: ['./test-template-variables.component.css'] }) export class TestTempRefVarComponent implements OnInit { constructor() { } ngOnInit() { } public saveValue(value: string): void { console.log(value); } }
test-template-variables.component.html
模板变量{{templateInput.value}}
值绑定:[]
test-value-bind.component.ts
@Component({ selector: 'app-test-value-bind', templateUrl: './test-value-bind.component.html', styleUrls: ['./test-value-bind.component.css'] }) export class TestValueBindComponent implements OnInit { public imgSrc = './assets/imgs/1.jpg'; constructor() { } ngOnInit() { } }
test-value-bind.component.html
单向值绑定
事件绑定:()
test-event-bind-component.ts
@Component({ selector: 'app-test-event-binding', templateUrl: './test-event-binding.component.html', styleUrls: ['./test-event-binding.component.css'] }) export class TestEventBindingComponent implements OnInit { constructor() { } ngOnInit() { } public btnClick(event: any): void { console.log(event + '测试事件绑定!'); } }
test-event-bind.component.html
事件绑定
双向绑定:[()]
test-twoway-binding.component.ts
@Component({ selector: 'app-test-twoway-binding', templateUrl: './test-twoway-binding.component.html', styleUrls: ['./test-twoway-binding.component.css'] }) export class TestTwowayBindingComponent implements OnInit { public fontSizePx = 14; constructor() { } ngOnInit() { } }
test-twoway-binding.component.html
双向绑定 Resizable Text
font-resizer.component.ts
@Component({ selector: 'app-font-resizer', templateUrl: './font-resizer.component.html', styleUrls: ['./font-resizer.component.css'] }) export class FontResizerComponent implements OnInit { @Input() size: number | string; @Output() sizeChange = new EventEmitter(); constructor() { } ngOnInit() { } decrement(): void { this.resize(-1); } increment(): void { this.resize(+1); } resize(delta: number) { this.size = Math.min(40, Math.max(8, +this.size + delta)); this.sizeChange.emit(this.size); } }
font-resizer.component.html
这是子组件
*ngIf
test-ng-if.component.ts
@Component({ selector: 'app-test-ng-if', templateUrl: './test-ng-if.component.html', styleUrls: ['./test-ng-if.component.css'] }) export class TestNgIfComponent implements OnInit { isShow = true; constructor() { } ngOnInit() { } }
test-ng-if.component.html
*ngIf的用法显示内容
*ngFor
test-ng-for.component.ts
@Component({ selector: 'app-test-ng-for', templateUrl: './test-ng-for.component.html', styleUrls: ['./test-ng-for.component.css'] }) export class TestNgForComponent implements OnInit { races = [ {name: 'star'}, {name: 'kevin'}, {name: 'kent'} ]; constructor() { } ngOnInit() { } }
test-ng-for.component.html
*ngFor用法名字列表
- {{i}}-{{name.name}}
ngSwitch
test-ng-switch.component.ts
@Component({ selector: 'app-test-ng-switch', templateUrl: './test-ng-switch.component.html', styleUrls: ['./test-ng-switch.component.css'] }) export class TestNgSwitchComponent implements OnInit { status = 1; constructor() { } ngOnInit() { } }
test-ng-switch.component.html
ngSwitch用法Good
Bad
Exception
HTML 属性与 DOM 属性关系
少量的 HTML 属性与 DOM 属性之间有着一对一的映射关系, 如 id;
有些 HTML 属性没有对应的 DOM 属性, 如 colspan;
有些 DOM 属性没有对应的 HTML 属性, 如 textContent;
就算名字相同, HTML 属性和 DOM 属性也不是同一样东西;
HTML 属性的值指定了初始值, DOM 属性的值表示当前值; HTML 属性的值不可改变, DOM 属性的值可以改变。
模板绑定是通过 DOM 属性和事件来工作的, 而不是 HTML 属性。
注意:插值表达式与属性绑定是同一个东西, 插值表达式属于 DOM 属性绑定。
NgClass
test-ng-class.component.ts
@Component({ selector: 'app-test-ng-class', templateUrl: './test-ng-class.component.html', styleUrls: ['./test-ng-class.component.scss'] }) export class TestNgClassComponent implements OnInit { public currentClasses: {}; public canSave = true; public isUnchanged = true; public isSpecial = true; constructor() { } ngOnInit() { this.currentClasses = { 'saveable': this.canSave, 'modified': this.isUnchanged, 'special': this.isSpecial }; } }
test-ng-class.component.html
NgClass用法设置多个样式
test-ng-class.component.less
.saveable { font-size: 18px; } .modified { font-weight: bold; } .special { background-color: #ff3300; }
NgStyle
test-ng-style.component.ts
@Component({ selector: 'app-test-ng-style', templateUrl: './test-ng-style.component.html', styleUrls: ['./test-ng-style.component.css'] }) export class TestNgStyleComponent implements OnInit { currentStyles: { }; canSave = false; isUnchanged = false; isSpecial = false; constructor() { } ngOnInit() { this.currentStyles = { 'font-style': this.canSave ? 'italic' : 'normal', 'font-weight': !this.isUnchanged ? 'bold' : 'normal', 'font-size': this.isSpecial ? '36px' : '12px' }; } }
test-ng-style.component.html
NgStyle用法用NgStyle批量修改内联样式!
NgModel
test-ng-model.component.ts
@Component({ selector: 'app-test-ng-model', templateUrl: './test-ng-model.component.html', styleUrls: ['./test-ng-model.component.css'] }) export class TestNgModelComponent implements OnInit { name = 'kevin'; constructor() { } ngOnInit() { } }
test-ng-model.component.html
NgModel的用法ngModel只能用在表单类的元素上面
管道
Angular 内置的常用管道:
uppercase 与 lowercase
uppercase 将字母转换成大写 {{‘aaa’ | uppercase}}
lowercase 将字母转换成小写 {{‘BBB’ | lowercase}}
Date
{{ birthday | date: ‘yyyy-MM-dd HH:mm:ss’}}
number
{{ pi | number: ‘2.2-2’}}
2.2-2: 表示是保留 2 位整数和 2 位小数。
2-2: 表示最少 2 位小数,最大 2 位小数。
示例
test-pipe.component.ts
@Component({ selector: 'app-test-pipe', templateUrl: './test-pipe.component.html', styleUrls: ['./test-pipe.component.css'] }) export class TestPipeComponent implements OnInit { currentTime: Date = new Date(); str = 'aaa'; money = 34.567; constructor() { } ngOnInit() { window.setInterval( () => { this.currentTime = new Date() } , 1000); } }
test-pipe.component.html
管道的用法{{ currentTime | date:'yyyy-MM-dd HH:mm:ss' }}{{ str | uppercase }}{{ money | number: '2.2-2' }}
非空断言
test-not-null-assert.component.ts
@Component({ selector: 'app-test-safe-nav', templateUrl: './test-not-null-assert.component.html', styleUrls: ['./test-not-null-assert.component.css'] }) export class TestSafeNavComponent implements OnInit { public currentValue: any = null; constructor() { } ngOnInit() { } }
test-not-null-assert.component.html
安全取值名字:{{currentValue?.name}}
感谢各位的阅读!关于“Angular中模板语法有哪些”这篇文章就分享到这里了,希望以上内容可以对大家有一定的帮助,让大家可以学到更多知识,如果觉得文章不错,可以把它分享出去让更多的人看到吧!