Looking at this task with a focus on creating an enhanced "Angular" solution for your specific conditional styling requirement. One effective approach would be to consolidate your input and label elements into a customized input component. Once you have established a new component using your initial elements as the base template, you can proceed with the following steps more efficiently.
The core strategy involves dynamically applying styles by leveraging Angular's [class] property binding or [NgStyle] directives.
- Initiate a ViewChild query on the template for the input element
- Implement an event listener on the input element within the template
- Upon detecting a keyup event, initiate a check on your
<input> field value and update a class property indicating whether the field is empty
- Subsequent change detection will trigger updates to the element's class through [NgClass] or [class] bindings
//component.ts
import { Component, Input, ViewChild, ElementRef } from '@angular/core'
@Component({
selector: 'app-input',
styleUrls: ['./input.component.css'],
templateUrl: './input.component.html'
})
export class InputComponent{
@Input() labelName: string = "Your Label Here"
@ViewChild("input") myInput:ElementRef<any> //ViewChild query
empty: Boolean = true; // tracking input value truthiness
isEmpty(){ // linked to keyup event on input element in template file
if (this.myInput.nativeElement.value){
this.empty = false;
} else{
this.empty = true;
}
}
styles(){ // connected to [ngClass] directive binding on input element in template file
return {
'empty': this.empty ? true : false,
'not-empty': this.empty ? false : true
}
}
}
//component.html with [ngClass] directive
<label for="my-input" #label> {{ labelName }}
<input type="text" id="my-input" [ngClass]="styles()" (keyup) = "isEmpty()" #input>
//component.html utilizing [style] property binding
// here, empty refers to the .ts file property
<label for="my-input" #label> {{ labelName }}
<input type="text" id="my-input" [class.empty]="empty" #input>