Appending additional classes to HTML elements based on condition in Angular [duplicate] - html

Question

What is wrong with my Angular code? I am getting the following error:
Cannot read property 'remove' of undefined at BrowserDomAdapter.removeClass
<ol>
<li *ngClass="{active: step==='step1'}" (click)="step='step1'">Step1</li>
<li *ngClass="{active: step==='step2'}" (click)="step='step2'">Step2</li>
<li *ngClass="{active: step==='step3'}" (click)="step='step3'">Step3</li>
</ol>

Answer 1

Angular version 2+ provides several ways to add classes conditionally:
type one
[class.my_class] = "step === 'step1'"
type two
[ngClass]="{'my_class': step === 'step1'}"
and multiple option:
[ngClass]="{'my_class': step === 'step1', 'my_class2' : step === 'step2' }"
type three
[ngClass]="{1 : 'my_class1', 2 : 'my_class2', 3 : 'my_class4'}[step]"
type four
[ngClass]="step == 'step1' ? 'my_class1' : 'my_class2'"
You can find these examples on the documentation page

Answer 2

[ngClass]=... instead of *ngClass.
* is only for the shorthand syntax for structural directives where you can for example use
<div *ngFor="let item of items">{{item}}</div>
instead of the longer equivalent version
<template ngFor let-item [ngForOf]="items">
<div>{{item}}</div>
</template>
See also https://angular.io/docs/ts/latest/api/common/index/NgClass-directive.html
<some-element [ngClass]="'first second'">...</some-element>
<some-element [ngClass]="['first', 'second']">...</some-element>
<some-element [ngClass]="{'first': true, 'second': true, 'third': false}">...</some-element>
<some-element [ngClass]="stringExp|arrayExp|objExp">...</some-element>
<some-element [ngClass]="{'class1 class2 class3' : true}">...</some-element>
See also https://angular.io/docs/ts/latest/guide/template-syntax.html
<!-- toggle the "special" class on/off with a property -->
<div [class.special]="isSpecial">The class binding is special</div>
<!-- binding to `class.special` trumps the class attribute -->
<div class="special"
[class.special]="!isSpecial">This one is not so special</div>
<!-- reset/override all class names with a binding -->
<div class="bad curly special"
[class]="badCurly">Bad curly</div>

Answer 3

Another solution would be using [class.active].
Example :
<ol class="breadcrumb">
<li [class.active]="step=='step1'" (click)="step='step1'">Step1</li>
</ol>

Answer 4

That's the normal structure for ngClass is:
[ngClass]="{'classname' : condition}"
So in your case, just use it like this...
<ol class="breadcrumb">
<li [ngClass]="{'active': step==='step1'}" (click)="step='step1'">Step1</li>
<li [ngClass]="{'active': step==='step2'}" (click)="step='step2'">Step2</li>
<li [ngClass]="{'active': step==='step3'}" (click)="step='step3'">Step3</li>
</ol>

Answer 5

with the following examples you can use 'IF ELSE'
<p class="{{condition ? 'checkedClass' : 'uncheckedClass'}}">
<p [ngClass]="condition ? 'checkedClass' : 'uncheckedClass'">
<p [ngClass]="[condition ? 'checkedClass' : 'uncheckedClass']">

Answer 6

You can use ngClass to apply the class name both conditionally and not in Angular
For Example
[ngClass]="'someClass'">
Conditional
[ngClass]="{'someClass': property1.isValid}">
Multiple Condition
[ngClass]="{'someClass': property1.isValid && property2.isValid}">
Method expression
[ngClass]="getSomeClass()"
This method will inside of your component
getSomeClass(){
const isValid=this.property1 && this.property2;
return {someClass1:isValid , someClass2:isValid};
}

Answer 7

Angular provides multiple ways to add classes conditionally:
First way
active is your class name
[class.active]="step === 'step1'"
Second way
active is your class name
[ngClass]="{'active': step=='step1'}"
Third way
by using ternary operator class1 and class2 is your class name
[ngClass]="(step=='step1')?'class1':'class2'"

Answer 8

You should use something ([ngClass] instead of *ngClass) like that:
<ol class="breadcrumb">
<li [ngClass]="{active: step==='step1'}" (click)="step='step1; '">Step1</li>
(...)

Answer 9

In Angular 7.X
The CSS classes are updated as follows, depending on the type of the expression evaluation:
string - the CSS classes listed in the string (space delimited) are added
Array - the CSS classes declared as Array elements are added
Object - keys are CSS classes that get added when the expression given in the value evaluates to a truthy value, otherwise they are removed.
<some-element [ngClass]="'first second'">...</some-element>
<some-element [ngClass]="['first', 'second']">...</some-element>
<some-element [ngClass]="{'first': true, 'second': true, 'third': false}">...</some-element>
<some-element [ngClass]="stringExp|arrayExp|objExp">...</some-element>
<some-element [ngClass]="{'class1 class2 class3' : true}">...</some-element>

Answer 10

Additionally, you can add with method function:
In HTML
<div [ngClass]="setClasses()">...</div>
In component.ts
// Set Dynamic Classes
setClasses() {
let classes = {
constantClass: true,
'conditional-class': this.item.id === 1
}
return classes;
}

Answer 11

to extend MostafaMashayekhi his answer for option two>
you can also chain multiple options with a ','
[ngClass]="{'my-class': step=='step1', 'my-class2':step=='step2' }"
Also *ngIf can be used in some of these situations usually combined with a *ngFor
class="mats p" *ngIf="mat=='painted'"

Answer 12

You can use [ngClass] or [class.classname], both will work the same.
[class.my-class]="step==='step1'"
OR
[ngClass]="{'my-class': step=='step1'}"
Both will work the same!

Answer 13

While I was creating a reactive form, I had to assign 2 types of class on the button. This is how I did it:
<button type="submit" class="btn" [ngClass]="(formGroup.valid)?'btn-info':''"
[disabled]="!formGroup.valid">Sign in</button>
When the form is valid, button has btn and btn-class (from bootstrap), otherwise just btn class.

Answer 14

We can make class dynamic by using following syntax. In Angular 2 plus, you can do this in various ways:
[ngClass]="{'active': arrayData.length && arrayData[0]?.booleanProperty}"
[ngClass]="{'active': step}"
[ngClass]="step== 'step1'?'active':''"
[ngClass]="step? 'active' : ''"

Answer 15

Let, YourCondition is your condition or a boolean property, then do like this
[class.yourClass]="YourCondition"

Answer 16

The directive operates in three different ways, depending on which of three types the expression evaluates to:
If the expression evaluates to a string, the string should be one or more space-delimited class names.
If the expression evaluates to an object, then for each key-value pair of the object with a truthy value the corresponding key is used as a class name.
If the expression evaluates to an array, each element of the array should either be a string as in type 1 or an object as in type 2. This means that you can mix strings and objects together in an array to give you more control over what CSS classes appear. See the code below for an example of this.
[class.class_one] = "step === 'step1'"
[ngClass]="{'class_one': step === 'step1'}"
For multiple options:
[ngClass]="{'class_one': step === 'step1', 'class_two' : step === 'step2' }"
[ngClass]="{1 : 'class_one', 2 : 'class_two', 3 : 'class_three'}[step]"
[ngClass]="step == 'step1' ? 'class_one' : 'class_two'"

Answer 17

ngClass syntax:
[ngClass]="{'classname' : conditionFlag}"
You can use like this:
<ol class="breadcrumb">
<li [ngClass]="{'active': step==='step1'}" (click)="step='step1'">Step1</li>
<li [ngClass]="{'active': step==='step2'}" (click)="step='step2'">Step2</li>
<li [ngClass]="{'active': step==='step3'}" (click)="step='step3'">Step3</li>
</ol>

Answer 18

This is what worked for me:
[ngClass]="{'active': dashboardComponent.selected_menu == 'profile'}"

Answer 19

For elseif statement (less comparison) use like that: (For example you compare three statement)
<div [ngClass]="step === 'step1' ? 'class1' : (step === 'step2' ? 'class2' : 'class3')"> {{step}} </div>

Answer 20

Not relevant with [ngClass] directive but I was also getting the same error as
Cannot read property 'remove' of undefined at...
and I thought to be the error in my [ngClass] condition but it turned out the property I was trying to access in the condition of [ngClass] was not initialized.
Like I had this in my typescript file
element: {type: string};
and In my [ngClass] I was using
[ngClass]="{'active', element.type === 'active'}"
and I was getting the error
Cannot read property 'type' of undefined at...
and the solution was to fix my property to
element: {type: string} = {type: 'active'};
Hope it helps somebody who is trying to match a condition of a property in [ngClass]

Answer 21

<div class="collapse in " [ngClass]="(active_tab=='assignservice' || active_tab=='manage')?'show':''" id="collapseExampleOrganization" aria-expanded="true" style="">
<ul> <li class="nav-item" [ngClass]="{'active': active_tab=='manage'}">
<a routerLink="/main/organization/manage" (click)="activemenu('manage')"> <i class="la la-building-o"></i>
<p>Manage</p></a></li>
<li class="nav-item" [ngClass]="{'active': active_tab=='assignservice'}"><a routerLink="/main/organization/assignservice" (click)="activemenu('assignservice')"><i class="la la-user"></i><p>Add organization</p></a></li>
</ul></div>
Code is good example of ngClass if else condition.
[ngClass]="(active_tab=='assignservice' || active_tab=='manage')?'show':''"
[ngClass]="{'active': active_tab=='assignservice'}"

Answer 22

Try Like this..
Define your class with ''
<ol class="breadcrumb">
<li *ngClass="{'active': step==='step1'}" (click)="step='step1; '">Step1</li>
<li *ngClass="{'active': step==='step2'}" (click)="step='step2'">Step2</li>
<li *ngClass="{'active': step==='step3'}" (click)="step='step3'">Step3</li>
</ol>

Answer 23

The example is a bit big, but triggering a class instead of typing inline is my first preferred approach.
this way you can add as many possibilities as you want to your element.
There may be a way for those who want to bind more than one [ngClass] to a single element.
<span class="inline-flex items-center font-medium" [ngClass]="addClass">{{ badge.text }}</span>
import { ChangeDetectionStrategy, Component, Input } from '#angular/core';
type Badge = {
size?: 'basic' | 'large';
shape?: 'basic' | 'rounded';
color?: 'gray' | 'red' | 'yellow' | 'green' | 'blue' | 'indigo' | 'purple' | 'pink';
dot?: boolean;
removeButton?: false;
text?: string;
}
#Component({
selector: 'bio-badge',
templateUrl: './badge.component.html',
styleUrls: ['./badge.component.scss'],
changeDetection: ChangeDetectionStrategy.OnPush,
})
export class BioBadgeComponent {
#Input() badge!: Badge;
get addClass() {
return {
'px-2.5 py-0.5 text-sx': this.badge.size === 'basic',
'px-3 py-0.5 text-sm': this.badge.size === 'large',
'rounded-full': this.badge.shape === 'basic',
'rounded': this.badge.shape === 'rounded',
'bg-gray-100 text-gray-800': this.badge.color === 'gray',
'bg-red-100 text-red-800': this.badge.color === 'red',
'bg-yellow-100 text-yellow-800': this.badge.color === 'yellow',
'bg-green-100 text-green-800': this.badge.color === 'green',
'bg-blue-100 text-blue-800': this.badge.color === 'blue',
'bg-indigo-100 text-indigo-800': this.badge.color === 'indigo',
'bg-purple-100 text-purple-800': this.badge.color === 'purple',
'bg-pink-100 text-pink-800': this.badge.color === 'pink',
}
}
}

Answer 24

If user want to display the class on basis of && and ||
then below one is work for me
[ngClass]="{'clasname_1': condition_1 && condition_2, 'classname_2': condition_1 && condition2, 'classname_3': condition}"
Example:
[ngClass]="{'approval-panel-mat-drawer-side-left': similar_toil_mode==='side' && showsTheSimilarToilsWithCloseIcon, 'approval-panel-mat-drawer-side-right': similar_toil_mode==='side' && !showsTheSimilarToilsWithCloseIcon, 'approval-panel-mat-drawer-over': similar_toil_mode==='over'}"