在上面的代码中,我们使用*ngIf else指令来判断用户的等级。如果用户的等级是"beginner",则显示欢迎消息"Welcome, beginner!",否则显示消息"Welcome, advanced user!"。总结ngIf else指令是Angular中非常有用的一个指令。它可以帮助我们轻松地根据某些条件来显示或隐藏HTML元素。通过本文的介绍,相信大家已经掌握了ngIf...
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...在 Angular 中,有三种标准的结构化指令。...*ngIf - 根据表达式返回的布尔值,有条件地包含一个模版(即条件渲染模版) *ngFor - 遍历数组 *ngSwitch - 渲染每个匹配的是图 下面是一个结构化指令的例子。...directive with the else clause 怎么使用 *ngFor 指令 我们使用 *ngFor 指令来遍历数组。
us to completely add or remove DOM Elements based on some condition. In this Tutorial, let’s learn what ngIf is and how to use it in Angular. We will show you how to add or remove elements using an example. We will also look at the optional else & then clause using theng-template...
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In app.component.html add the following code, <div *ngIf="condition; else falseCondition"> You have selected: <h2>"True"</h2> </div> <ng-template #falseCondition> You have selected: <h2>"False"</h2> </ng-template> Markup Copy In app.component.ts add the following code, condition...
The network may be unreliable and loading data may take time. Thus it is important to give the user some feedback about what's going on as fast as possible. In this lesson we learn how to leverage theelseblock of the*ngIfdirective to show a simple loading indicator. ...
if(display){<div>I am here</div>} else{<div>I am not here</div>} Allerdings können wir in HTML keine Klammern verwenden, um if-else-Blöcke zu schreiben, da nur Markup-Elemente in die HTML-Datei aufgenommen werden sollten. Die ideale Lösung besteht darin, if else Bedingungsb...
Rightnow i've hard coded index but this json is returned from the database and indexes will be different, i've written function to properly make if and else conditions work but i am unsure on how i can get the index of that particular object instead of hard coded indexes. Expected / ...