Tips on applying a class to a host element using @hostbinding in Angular 2

I've been wanting to assign a class to the host element of my component, and initially I used the host property in this manner:

@Component({
  selector: 'left-bar',
  host: { 'class': 'left-bar' },
  templateUrl: 'app/left-bar/left-bar.component.html',
  styleUrls: ['app/left-bar/left-bar.component.css']
})
export class LeftBarComponent implements OnInit {

  ngOnInit() {
  }

}

However, TypeScript now displays a warning indicating that this approach is considered bad practice.

[tslint] In the "@Component" class decorator of the class "LeftBarComponent" you are using the "host" property, this is considered bad practice. Use "@HostBindings", "@HostListeners" property decorator instead.

Is there a better way to add a class to the host element and eliminate this warning?

Thank you!

Update: Following the response below: Although I am able to apply the class, the styling does not seem to affect the parent host element once the class is added. My CSS styling is relatively simple:

.left-bar {
  position: fixed;
  width: 120px;
  left: 0;
  top: 0;
  bottom: 0;
  background: #323232; }

Answer №1

The Angular2 style recommendations suggest using @HostBinding, but that doesn't mean defining host: {...} is necessarily wrong.

Here is an example:

@Component({
  selector: 'left-bar',
  templateUrl: 'app/left-bar/left-bar.component.html',
  styleUrls: ['app/left-bar/left-bar.component.css']
})
export class LeftBarComponent implements OnInit {
  @HostBinding('class.left-bar') leftBarClass = true;
  // or @HostBinding('class') leftBarClass = 'left-bar';

  ngOnInit() {
  }

}

Similar questions

If you have not found the answer to your question or you are interested in this topic, then look at other similar questions below or use the search

Discovering how to specify the type of a dynamically created object using 'for await' in TypeScript

for await (user of users) { ... } Encountered an issue: "error TS2552: Cannot find name 'user'. Did you mean 'users'?" Appreciate your assistance. ...

Unable to locate any NativeScript modules for tns-core-module/ui

I'm working on a {N}-Application and facing an issue with importing Images from the tns-core-modules/ui/image module. Unfortunately, it seems that the target cannot be found within the tns-core-module. This is my code snippet: import * as ImageModul ...

Can anyone provide a solution for the issue with bootstrap utilities?

Currently, I am using Vue3 with Vite and attempting to integrate Bootstrap into my project. While I have managed to implement most of it successfully, I encountered a significant error when trying to override Bootstrap-related variables. Can anyone offer a ...

Guide on transitioning from @ngrx/store syntax version 2.2.1 to the latest version 6.1.2

Need help upgrading the syntax usage of @ngrx/store from version 2.2.1 to version 6.1.2 Upon recently upgrading my Angular project from Angular ^2.0.0 to Angular ^6.0.0 along with related npm plugins, I encountered issues with the usage of @ngrx/store and ...

How can I implement a search box on my HTML website without relying on Google Custom Search?

Greetings to all! I am currently managing a website filled with HTML content. I am looking to incorporate a search box into the site. After researching on Google, most of the results point towards using Google Custom Search. However, I require a search box ...

Stop all animations in JS and CSS

Looking for a way to halt all CSS and JavaScript animations, including canvas and webGL effects, on a specific webpage. Some animations can cause slow performance on certain browsers like Opera and Firefox, so I'm seeking a code snippet or guidance o ...

Extract value from child div using JQuery and update text in another section of the page

Here is a fiddle showcasing the concept I am working on: https://jsfiddle.net/wvz9p3e7/1/ The code is written in PHP and involves a loop for cycling through 7 or 8 different garments. My goal is to have the window on the right side of the fiddle display t ...

Typescript: Utilizing a generic array with varying arguments

Imagine a scenario where a function is called in the following manner: func([ {object: object1, key: someKeyOfObject1}, {object: object2, key: someKeyOfObject2} ]) This function works with an array. The requirement is to ensure that the key field co ...

Steps for generating an instance of a concrete class using a static method within an abstract class

Trying to instantiate a concrete class from a static method of an abstract class is resulting in the following error: Uncaught TypeError: Object prototype may only be an Object or null: undefined This error occurs on this line in ConcreteClass.js: re ...

When utilizing makeStyles in @mui, an error may occur stating that property '' does not exist on type 'string'

I am stuck with the code below: const useStyles = makeStyles(() => ({ dialog: { root: { position: 'absolute' }, backdrop: { position: 'absolute' }, paperScrollPaper: { overflow: 'visib ...

The issue arises due to conflicting indent configurations between eslint and @typescript-eslint/indent

Currently, I am using eslint and prettier in a TS express application. I am trying to set the tab width to 4, but it appears that there is a conflict between the base eslint configuration and the typescript eslint. When looking at the same line, this is w ...

typescript warns that an object may be potentially null

interface IRoleAddProps { roles: Array<IRole> } interface IRoleAddState { current: IRole | null } class RoleAdd extends React.Component<IRoleAddProps, IRoleAddState> { state = { current: null, } renderNoneSelect = () ...

Prevent the elongation of HTML select elements in Bootstrap

Struggling to set the size of an HTML "select" field in Bootstrap 3 (latest) to normal width instead of 100%? Looking for a cleaner solution than resorting to tables or adding fields within bootstrap columns that might cause indentation issues due to borde ...

What is the best way to close the space between a box-shadow and a div background when incorporating semi-transparent rgba() values?

There seems to be an issue arising when applying partially transparent rgba() background-color and box-shadow color values to an element with a non-fixed (percent-based) border-radius. This combination results in a minuscule transparent gap appearing at th ...

How to hide text within a contenteditable element

I'm trying to create a contenteditable span that behaves like a password field in a Linux terminal; the text is entered, but not visible. I've experimented with different CSS properties like visibility: hidden and display: none, but they don&apos ...

Tips for toggling the visibility of a <div> element using PHP code inside

I'm having trouble with a dropdown list that is supposed to show/hide some divs containing PHP files. However, when I try to toggle the visibility of the divs using the dropdown list, it doesn't seem to work as expected. Can anyone help me figure ...

Having trouble retrieving form values in Typescript React, only receiving HTML tag as output

I am having an issue with retrieving the form value to my useRef hook as it returns the HTML tag of the form instead. To solve this, I attempted to specify the type HTMLFormElement inside the chevrons and set null as the initial value for my useRef hook. ...

Steps for resetting the ng-multiselect-dropdown

Is it necessary to wrap the ng-multiselect-dropdown in a form in order to reset it? code - app.component.html <div> <p id = "node">Select a Root API Object - </p> <p style="width:50%"> <ng-multiselect-dropdown [placeho ...

Implementing JavaScript Code in TypeScript

Every JavaScript code should also be valid in TypeScript, but when attempting to run the following code snippet below, an error is triggered. Could someone convert this JavaScript code into TypeScript? Error: 20:9 - TS2531 Error: Object is possibly 'z ...

Removing CSS errors from HTML files in Visual Studio Code on a Mac

Currently, I am utilizing Visual Studio Code on a Mac for writing AngularJS style HTML. Whenever I try to include an inline expression for a CSS value, I encounter an irritating red Intellisense error, as displayed in the screenshot provided below. It is w ...