Set css class dynamically in Angular from expression
There are times when you need to set a css class of a html element dynamically in angular, given a simple or complex condition.
This was the case for me when I had to set a different backround-color and color attributes for an anchor a html element
to display the latest searches on the landing page of Codever
Use ngClass (before)
You can do it by setting the desired css class directly to the ngClass input
of the element. The thing is if the condition gets complex, as in my case where I used initially combined ?: construct
it can get hard to read and understand:
<a
(mouseover)="hoveringLastSearches[i]=true"
(mouseout)="hoveringLastSearches[i]=false"
[routerLink]="['/search']"
[queryParams]="{q: mySearch.text, sd: mySearch.searchDomain }"
class="badge badge-secondary mb-1 ml-1"
[ngClass]="mySearch.searchDomain === 'my-snippets' ? 'snippet-last-search' : mySearch.searchDomain === 'my-bookmarks' ? 'my-bookmarks-last-search' : 'public-bookmarks-last-search' "
title="Search in "
> <i class="fa fa-xs fa-search mr-1"></i>
<span *ngIf="!hovering(i); else longVersion"></span>
<ng-template #longVersion></ng-template>
<i *ngIf="mySearch.searchDomain === 'my-snippets' || mySearch.searchDomain === 'public-snippets'"
class="fa fa-xs fa-code ml-1"></i>
<i *ngIf="mySearch.searchDomain === 'my-bookmarks' || mySearch.searchDomain === 'public-bookmarks'"
class="fa fa-xs fa-bookmark ml-1"></i>
</a>
Set the css class directly to [class] input (after)
The second option, which I used eventually is to set your css class to the [class] attribute of the html element
with the following syntax:
<a
(mouseover)="hoveringLastSearches[i]=true"
(mouseout)="hoveringLastSearches[i]=false"
[routerLink]="['/search']"
[queryParams]="{q: mySearch.text, sd: mySearch.searchDomain }"
class="badge badge-secondary mb-1 ml-1"
[class.my-snippets-last-search]="mySearch.searchDomain === 'my-snippets'"
[class.public-snippets-last-search]="mySearch.searchDomain === 'public-snippets'"
[class.my-bookmarks-last-search]="mySearch.searchDomain === 'my-bookmarks'"
[class.public-bookmarks-last-search]="mySearch.searchDomain === 'public-bookmarks'"
title="Search in "
> <i class="fa fa-xs fa-search mr-1"></i>
<span *ngIf="!hovering(i); else longVersion"></span>
<ng-template #longVersion></ng-template>
<i *ngIf="mySearch.searchDomain === 'my-snippets' || mySearch.searchDomain === 'public-snippets'"
class="fa fa-xs fa-code ml-1"></i>
<i *ngIf="mySearch.searchDomain === 'my-bookmarks' || mySearch.searchDomain === 'public-bookmarks'"
class="fa fa-xs fa-bookmark ml-1"></i>
</a>
In my opinion the latter is easier to grasp.
You can see the how it looks in action in the following animation:
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