I have three buttons in a view and on page load I am displaying the first buttons content. Once a button is clicked the button becomes active but on page load the initial button is not set to active. In order to show the first button active I added this to the div:
[ngClass]="'active'"
The problem with this is now when another button is clicked the first button keeps the active class. I am evaluating the data being show based on a string. On click of each button the string changes.
How can I add a condition to check for the current string? So if the string matches the current data being show then add the active class to this button?
So something like this is what I am looking for:
[ngClass]="'active'" if "myString == ThisIsActiveString;
This is my current button, but the class is not added when I add it in this syntax:
<button [class.active]="shown == EQUIFAX" (click)="shown = 'EQUIFAX'" type="button" id="equifax" class="btn btn-secondary">Equifax Report </button>
To be clear the string is defaulted to "EQUIFAX" on page load.
This is based on answer:
<button [ngClass]="'active' : shown == 'EQUIFAX'" (click)="shown = 'EQUIFAX'" type="button" id="equifax" class="btn btn-secondary">Equifax Report </button>
To add a conditional class in Angular we can pass an object to ngClass where key is the class name and value is condition i.e., true or false as shown below. And in the above code, class name will be added only when the condition is true.
You can use both class and ngClass as the first one gives you the opportunity to apply a class that you want to implement in all cases under any circumstances and the later to apply classes conditionally.
With class binding, we can add only single class conditionally. However to set multiple classes we can use ngClass directive.
ngClass is a directive in Angular that adds and removes CSS classes on an HTML element.
You can add css class based on condition in NgClass
directive itself:
[ngClass]="{ 'active': myString == ThisIsActiveString }";
You can read more about NgClass
directive and find examples here.
Your equivalence statement of [class.active]="shown == EQUIFAX"
is comparing shown to a variable named EQUIFAX
.
You should, instead, change the equivalency to compare to the string [class.active]="shown == 'EQUIFAX'"
Using [ngClass] would get you [ngClass]="{'active': shown == 'EQUIFAX'}
Here's a playground with this implemented: http://plnkr.co/edit/j2w8aiQPghl0bPZznoF2?p=preview
If you want for example to add many classes and have two or more conditions, each class and condition you can add after ,
comma.
For example
[ngClass]="{'first-class': condition,
'second-class': !condition}"
you can do that:
[class.nameForYourClss]="myString == ThisIsActiveString ";
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