在组件的模板中,使用*ngIf指令来判断当前路由是否匹配路径"/example": 代码语言:html 复制 显示内容 在组件的类中,定义一个方法来检查当前路由是否匹配指定的路径: 代码语言:typescript 复制 import { Component } from '@angular/core'; import { ActivatedRoute } from '@angular/router'; @Component(...
我们的angular库引入第三方js ts npm install lodash 我们在使用的时候 @ts-ignore import * as _ from 'lodash' 本质就是我们的包依赖第三方的包 ngIf html as 就是类似赋值一个变量给子代使用 {{bool}} or as 就是类似赋值一个变量给子代使用 {{bool1}} <ng-container *ngIf="{ a: 1, b...
import { Component, OnInit, ChangeDetectorRef } from '@angular/core'; @Component({ selector: 'app-example', template: ` {{ content }} `, }) export class ExampleComponent implements OnInit { showContent: boolean = false; content: string = ''; constructo...
ng-if will remove elements from DOM. This means that all your handlers or anything else attached to those elements will be lost. For example, if you bound a click handler to one of child elements, when ng-if evaluates to false, that element will be removed from DOM and your click handl...
AngularngIf设置为true时不显示元素 我想使用ngIf语句在一段时间后呈现一些HTML代码。为了更容易再现,我的HTML看起来像这样: Hello world 我的Typescript在两秒钟后将reload变量设置为true,如下所示: reload: boolean; ngOnInit(): void { this.reload...
Angular11中*NgIf的一般条件 将其包装到component类中的函数中: isCompanyTypeHeadOffice() { return horizontalStepperForm.value.step2.companyType == 'Head_Office'} 然后你可以这样做: <mat-option *ngIf="isCompanyTypeHeadOffice()" value="Light">Light</mat-option><mat-option *ngIf="isCompanyTypeHea...
angularJS中的ng-show、ng-hide、ng-if指令都可以用来控制dom元素的显示或隐藏。ng-show和ng-hide根据所给表达式的值来显示或隐藏HTML元素。当赋值给ng-show指令的值为false时元素会被隐藏,值为true时元素会显示。ng-hide功能类似,使用方式相反。元素的显示或隐藏是通过改变CSS的display属性值来实现的。
angular 报错 ERROR Error: If ngModel is used within a form tag, either the name attribute must be set or the form control must be defined as 'standalone' in ngModelOptions. Example 1: Example 2: 创建 表单的时候,系统默认会创建一个”FormGroup"的对象。用带有“ngModel"的”“标签时 ...
this means removing the control imperatively in the model by callingthis.form.removeControl('name')when the button is clicked. Then, the ngIf should depend on the control's presence in the model with*ngIf="form.contains('name')", rather than the other way around. See example plunker here...
Which @angular/* package(s) are the source of the bug? Don't known / other Is this a regression? No Description I have a component that has conditional logic using an @if (or *ngIf) condition on a flag, e.g., @if (model.editable) or <ngC...