[ngSwitch]表达式是一个条件语句,用于根据指定的值将不同的元素集插入到文档中,该值在本例中是item.complete属性。嵌套在td元素中的是两个用*ngSwitchCase和*ngSwitchDefault标注的span元素,它们相当于普通 JavaScript switch块的case和default关键字。我在第十三章中详细描述了ngSwitch(以及第十四章中方括号的含义),...
Structural directives : directive est structurelle lorsqu'elle modifie la structure du DOM, c'est-à-dire lorsqu'on ajoute, supprime ou déplace une balise.(*NgIf,*NgFor,*NgSwitch) Structural directives : une directive d'attribut, on parle d'une directive qui change un attribut de l'éléme...
ngSwitch根据条件有条件地交换内容。在下一个代码片段中,ngSwitch绑定到choice属性。如果ngSwitchCase匹配此属性的值,则显示相应的 HTML 元素。如果没有匹配项,则显示与ngSwitchDefault关联的元素: One Two Many ngClass在元素上添加和删除 CSS 类。指令应接收一个带有类名作为键和表达式作为值的对象,这些表达式...
One interesting use of this can be for multiple return values. Imagine a function randomPonyInRace that returns a pony and its position in a race. function randomPonyInRace() { const pony = { name: 'Rainbow Dash' }; const position = 2; // ... return { pony, position }; } const...
The when attribute is used to inform ngSwitch which element to display when the on expression is evaluated. If a matching expression is not found via a when attribute then an element with the default attribute is displayed. Be aware that the attribute values to match against cannot be ...
the NgSwitch directive now defaults to the === equality operator, migrating from the previously used == operator. NgSwitch expressions and / or individual condition values need adjusting to this stricter equality check. The added warning message should help pin-pointing NgSwitch usages where adjustm...
The ngSwitch directive: This directive also allows us to do conditional rendering. It works like a regular switch statement. It’s typically used when dealing with simple equality operations. For example: template: ` you will never walk alone <!--or--> <ng-template [ngSwitchCase]="'liver...
ba85d08158 fix handle empty ngSwitchCase (#56105) v18.0.0 Compare Source Blog post "Angular v18 is now available". Breaking Changes animations Deprecated matchesElement method has been removed from AnimationDriver as it is unused. common The deprecated isPlatformWorkerUi and isPlatformWorkerApp...
the NgSwitch directive now defaults to the === equality operator, migrating from the previously used == operator. NgSwitch expressions and / or individual condition values need adjusting to this stricter equality check. The added warning message should help pin-pointing NgSwitch usages where adjustm...
The structure directive has the following built-in directive *ngIf, *ngFor , *ngSwitch and is used to transform the DOM structure. But, first, let’s install a new angular project or you can use Stackblitz online code editor, especially for angular. If you do not have the latest ...