Angular4 is a new concept for me as I work on my practice projects.
To access HTML elements and retrieve their values, I have been using
<HTMLInputElement> document.getElementById<HTMLSelectElement> document.getElementByIdI'm curious if Angular offers any alternative methods for achieving this.
If you want to identify your DOM element, you can assign it a tag using #someTag and then access it using @ViewChild('someTag').
Here is an example for better understanding:
import {AfterViewInit, Component, ElementRef, ViewChild} from '@angular/core';
@Component({
selector: 'app',
template: `
<div #myDiv>Some text</div>
`,
})
export class AppComponent implements AfterViewInit {
@ViewChild('myDiv') myDiv: ElementRef;
ngAfterViewInit() {
console.log(this.myDiv.nativeElement.innerHTML);
}
}
The console.log function will display the output as Some text.
To access the DOCUMENT token, simply inject it into the constructor and utilize its functions accordingly
import { Inject } from '@angular/core';
import { DOCUMENT } from '@angular/common';
@Component({...})
export class AppCmp {
constructor(@Inject(DOCUMENT) document: Document) {
document.getElementById('el');
}
}
Alternatively, if the desired element is within that component, you can make use of template references.
When working with Angular 8 or later versions, the @ViewChild now requires an additional parameter known as opts. This parameter includes two properties: read and static (where read is optional). Here's how you can use it:
import { ElementRef, ViewChild } from '@angular/core';
// ...
@ViewChild('mydiv', { static: false }) public mydiv: ElementRef;
constructor() {
// ...
<div #mydiv></div>
Keep in mind that as of Angular 9, Static: false is no longer mandatory. You can simply use { static: true } when accessing the variable within ngOnInit.
Give this a shot:
Check out this TypeScript file code:
(<HTMLInputElement>document.getElementById("name")).value
Here is the corresponding HTML code:
<input id="name" type="text" #name />
target: HTMLElement;
initialize() {}
simulateClick(){
this.target = document.getElementById('ButtonX') as HTMLElement;
this.target.click();
}
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