Trigger selectionchange event from formArray control in TypeScript
If you’re working with Angular and TypeScript, you may have encountered a scenario where you need to trigger the selectionchange
event from a formArray
control. This event is commonly used for handling changes in select dropdowns, and being able to trigger it programmatically can be useful in certain situations.
In this blog post, we’ll explore two different solutions to trigger the selectionchange
event from a formArray
control in TypeScript.
Solution 1: Using the ElementRef
The first solution involves using the ElementRef
class from Angular’s core library. This class provides access to the underlying DOM element, allowing us to trigger events directly.
Here’s an example code snippet that demonstrates how to trigger the selectionchange
event using the ElementRef
:
import { Component, ElementRef, ViewChild } from '@angular/core';
@Component({
selector: 'app-example',
template: `
`
})
export class ExampleComponent {
@ViewChild('mySelect') mySelect: ElementRef;
triggerSelectionChange() {
const event = new Event('selectionchange');
this.mySelect.nativeElement.dispatchEvent(event);
}
onSelectionChange(event: Event) {
// Handle the selection change event here
}
}
In the above code, we define a select
element with a reference variable #mySelect
. We then use the @ViewChild
decorator to access this element in our component class. Inside the triggerSelectionChange
method, we create a new selectionchange
event using the Event
constructor and dispatch it on the nativeElement
of the mySelect
element.
Solution 2: Using Renderer2
The second solution involves using Angular’s Renderer2
class. This class provides a safe way to interact with the DOM, even in environments where direct access to the DOM is restricted.
Here’s an example code snippet that demonstrates how to trigger the selectionchange
event using the Renderer2
:
import { Component, Renderer2, ViewChild } from '@angular/core';
@Component({
selector: 'app-example',
template: `
`
})
export class ExampleComponent {
@ViewChild('mySelect') mySelect: ElementRef;
constructor(private renderer: Renderer2) {}
triggerSelectionChange() {
const event = new Event('selectionchange');
this.renderer.dispatchEvent(this.mySelect.nativeElement, event);
}
onSelectionChange(event: Event) {
// Handle the selection change event here
}
}
In the above code, we inject the Renderer2
class into our component’s constructor. Inside the triggerSelectionChange
method, we create a new selectionchange
event using the Event
constructor and dispatch it using the dispatchEvent
method of the Renderer2
class.
Both solutions allow you to trigger the selectionchange
event from a formArray
control in TypeScript. Choose the solution that best fits your project’s requirements and coding style.
That’s it! You now know how to trigger the selectionchange
event from a formArray
control in TypeScript. Happy coding!
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