In the new Angular2 framework, does anyone know the proper way to do a hover like an event?
In Angular1 there was ng-Mouseover
, but that doesn't seem to have been carried over.
I've looked through the docs and haven't found anything.
This question is related to
javascript
angular
events
hover
@Component({
selector: 'drag-drop',
template: `
<h1>Drag 'n Drop</h1>
<div #container
class="container"
(mousemove)="onMouseMove( container)">
<div #draggable
class="draggable"
(mousedown)="onMouseButton( container)"
(mouseup)="onMouseButton( container)">
</div>
</div>`,
})
If the mouse over for all over the component is your option, you can directly is @hostListener
to handle the events to perform the mouse over al below.
import {HostListener} from '@angular/core';
@HostListener('mouseenter') onMouseEnter() {
this.hover = true;
this.elementRef.nativeElement.addClass = 'edit';
}
@HostListener('mouseleave') onMouseLeave() {
this.hover = false;
this.elementRef.nativeElement.addClass = 'un-edit';
}
Its available in @angular/core
. I tested it in angular 4.x.x
If you are interested in the mouse entering or leaving one of your components you can use the @HostListener
decorator:
import { Component, HostListener, OnInit } from '@angular/core';
@Component({
selector: 'my-component',
templateUrl: './my-component.html',
styleUrls: ['./my-component.scss']
})
export class MyComponent implements OnInit {
@HostListener('mouseenter')
onMouseEnter() {
this.highlight('yellow');
}
@HostListener('mouseleave')
onMouseLeave() {
this.highlight(null);
}
...
}
As explained in the link in @Brandon comment to OP (https://angular.io/docs/ts/latest/guide/attribute-directives.html)
Simply do (mouseenter)
attribute in Angular2+...
In your HTML do:
<div (mouseenter)="mouseHover($event)">Hover!</div>
and in your component do:
import { Component, OnInit } from '@angular/core';
@Component({
selector: 'component',
templateUrl: './component.html',
styleUrls: ['./component.scss']
})
export class MyComponent implements OnInit {
mouseHover(e) {
console.log('hovered', e);
}
}
yes there is on-mouseover
in angular2 instead of ng-Mouseover
like in angular 1.x so you have to write this :-
<div on-mouseover='over()' style="height:100px; width:100px; background:#e2e2e2">hello mouseover</div>
over(){
console.log("Mouseover called");
}
As @Gunter Suggested in comment there is alternate of on-mouseover
we can use this too. Some people prefer the on- prefix alternative, known as the canonical form.
HTML Code -
<div (mouseover)='over()' (mouseout)='out()' style="height:100px; width:100px; background:#e2e2e2">hello mouseover</div>
Controller/.TS Code -
import { Component } from '@angular/core';
@Component({
selector: 'my-app',
templateUrl: './app.component.html',
styleUrls: [ './app.component.css' ]
})
export class AppComponent {
name = 'Angular';
over(){
console.log("Mouseover called");
}
out(){
console.log("Mouseout called");
}
}
Some other Mouse events can be used in Angular -
(mouseenter)="myMethod()"
(mousedown)="myMethod()"
(mouseup)="myMethod()"
You can do it with a host:
import { Directive, ElementRef, Input } from '@angular/core';
@Directive({
selector: '[myHighlight]',
host: {
'(mouseenter)': 'onMouseEnter()',
'(mouseleave)': 'onMouseLeave()'
}
})
export class HighlightDirective {
private _defaultColor = 'blue';
private el: HTMLElement;
constructor(el: ElementRef) { this.el = el.nativeElement; }
@Input('myHighlight') highlightColor: string;
onMouseEnter() { this.highlight(this.highlightColor || this._defaultColor); }
onMouseLeave() { this.highlight(null); }
private highlight(color:string) {
this.el.style.backgroundColor = color;
}
}
Just adapt it to your code (found at: https://angular.io/docs/ts/latest/guide/attribute-directives.html )
For handling the event on overing, you can try something like this (it works for me):
In the Html template:
<div (mouseenter)="onHovering($event)" (mouseleave)="onUnovering($event)">
<img src="../../../contents/ctm-icons/alarm.svg" class="centering-me" alt="Alerts" />
</div>
In the angular component:
onHovering(eventObject) {
console.log("AlertsBtnComponent.onHovering:");
var regExp = new RegExp(".svg" + "$");
var srcObj = eventObject.target.offsetParent.children["0"];
if (srcObj.tagName == "IMG") {
srcObj.setAttribute("src", srcObj.getAttribute("src").replace(regExp, "_h.svg"));
}
}
onUnovering(eventObject) {
console.log("AlertsBtnComponent.onUnovering:");
var regExp = new RegExp("_h.svg" + "$");
var srcObj = eventObject.target.offsetParent.children["0"];
if (srcObj.tagName == "IMG") {
srcObj.setAttribute("src", srcObj.getAttribute("src").replace(regExp, ".svg"));
}
}
In your js/ts file for the html that will be hovered
@Output() elemHovered: EventEmitter<any> = new EventEmitter<any>();
onHoverEnter(): void {
this.elemHovered.emit([`The button was entered!`,this.event]);
}
onHoverLeave(): void {
this.elemHovered.emit([`The button was left!`,this.event])
}
In your HTML that will be hovered
(mouseenter) = "onHoverEnter()" (mouseleave)="onHoverLeave()"
In your js/ts file that will receive info of the hovering
elemHoveredCatch(d): void {
console.log(d)
}
In your HTML element that is connected with catching js/ts file
(elemHovered) = "elemHoveredCatch($event)"
Source: Stackoverflow.com