My dilemma involves an input field for which I need to conditionally apply a CSS class.
For instance, if firstName == undefined, I want to apply the CSS class ng-dirty. To achieve this, I attempted:
<input required [(ngModel)]="customer.firstName" name="firstName"
type="text" minlength="2" maxlength="50" ng-class="{ng-dirty : customer.firstName === undefined}">Despite my efforts, this approach did not produce the desired outcome.
In case you are working with Angular 2 or Angular 4, the following is the conditional syntax for NgClass
<some-element [ngClass]="{'first': true, 'second': true, 'third': false}">...</some-element>
However, if you are using AngularJS (i.e. angular 1.x), you can use the code below
<some-element ng-class="{'fist' : true, 'second': true}">...</some-element>
Here's the Official Documentation for Angular4 [NgClass]
And here's the Official Documentation for AngularJS ng-class
I hope this information proves to be helpful :)
One possible solution could be:
<input required [(ngModel)]="customer.firstName" name="firstName"
type="text" minlength="2" maxlength="50" [class]="(customer.firstName == undefined) ? 'dirty' : ''" >
It seems unlikely that customer.firstName will ever be undefined, considering you initialized it when assigning it to the model.
Using JavaScript object notation, the inclusion of dashes is not allowed; all you have to do is wrap it in quotes.
<textarea required [(ngModel)]="user.lastName" name="lastName"
rows="4" cols="50" placeholder="Enter your last name" ng-class="{'ng-touched': user.lastName === undefined}">
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