这里使用了ng-template来定义else语句的内容,并通过"#emptyState"来引用它。 使用ngIf指令可以方便地验证变量是否为空,并根据条件来显示不同的内容。在Angular中,ngIf是一个非常常用的指令,适用于各种场景,例如根据登录状态显示不同的导航菜单、根据数据是否存在来显示不同的列表等。
</ng-template> 来源取自 here on Angular's NgIf and Else syntax。 我没有发现只为一行使用模板又好又干净 @arunwithasmile 相同,这只是两种语法的示例。除非需要,否则 *ngIf 是要走的路。 P Peter Mortensen 您可以使用 <ng-container> 和<ng-template> 来实现: <ng-container *ngIf="isValid; ...
Ng if else is a structural directive in Angular, which is used to display content based on a condition. If the condition is true, it displays one set of content; otherwise, it displays another. Syntax The syntax for the ngIf Else statement is as follows: ...
In angular 4/5, inside a template you can achieve the same thing by doing: 1) *ngIf-else syntax content here ... <ng-template #other_content>other content here...</ng-template> 2) *ngIf="isValid" *ngIf="!isValid" content here ... other content here......
ngIf/Else syntax is not available in angular 2 but is available in angular 4 For angular 2, you need to use ngIf two times, and in second time you negate the value being compared (not using the !=, but having ampersand with the value) Hello {{userName}}, how are you Hello,...
Syntax ThengIf else ifsyntax is as follows: <some-element*ngIf="condition1; else condition2">...</some-element><ng-template#condition2><some-element*ngIf="condition3">...</some-element><some-element*ngIf="!condition3">...</some-element></ng-template> ...
of Angular with v4. Angular 4.0.0-rc.1 was released in late February with rc.2 hot on it’s heels 6 days later, today, March 2nd. There are lots of improvements including smaller bundle sizes and faster compilation. My favorite new feature at the moment is the new NgIf/Else syntax....
然而,ngIf指令是Angular框架中的一个指令,用于根据条件来决定是否渲染某个元素或组件。由于ngIf指令是基于条件判断而非变量的变化来决定是否渲染,因此变量更改检测似乎不适用于ngIf。 ngIf指令的作用是根据给定的条件来决定是否在DOM中渲染某个元素或组件。当条件为真时,元素或组件会被渲染并显示在页面上;当条件为...
My favorite new feature at the moment is the new NgIf/Else syntax. Previously, you may have used something like this: 1 2 3 4 5 6 7 Condition Passed! Condition Failed! Now you can use syntax like this: 1 2 3 4 5 6 7 Condition Passed! <ng-template #falsyTemplate> ...
NgIf syntax has been extended to support else clause to display template when the condition is false. In addition the condition value can now be stored in local variable, for later reuse. This is e...