One perspective is that applying ngFor during rendering converts it into a normal format. However, when adding ngFor to a div, it is important to note that while NgFor can iterate an array, it cannot be directly iterated in ngContainer or ngContent.
I am working on a project that includes the following code. Could you explain its purpose? While I am familiar with
, I am unsure about the functions of
. Is there a more efficient way to simplify this code?
I would prefer it to be displayed in the manner depicted beneath.
But then it shows this error:
When using Angular, it is not possible to have more than one
on a single element. Instead, you should either use a single
‘template’, or prefix it with an asterisk (*) to avoid any conflicts.
Angular refers to the
directive as microsyntax, which simplifies the configuration process for developers. The preceding
is an example of the microsyntax being used.
Will for example be equal to:
As shown in the example mentioned in your question.
To put it briefly, by using
*ngFor="let topic of topicdata"
, you can substitute your code and achieve identical outcomes.
To address the issue, the *ngIf should be adjusted to appear on a different line instead of being on the same line.
When it comes to using structural directives in angular, it is important to note that using multiple of them on the same element is not permitted. To use
on the same line, it is recommended to loop out an
element and place your
Additional information regarding
can be found here.
The ngFor syntax can be written differently using
. This syntax creates topic variables from the topicdata array. Alternatively, you can create the same syntax (with ng-template) by writing it as follows.
// some template
Additional information regarding this can be accessed at https://angular.io/guide/structural-directives#inside-ngfor.