AngularJS2中一种button切换效果的实现(三)

2017030386349start-2090242_960_720.jpg

之前在AngularJS2中一种button切换效果的实现(一)AngularJS2中一种button切换效果的实现(二)中实现了按钮的切换效果,但是方法比较low,这次我们使用Angular2的指令来实现。

指令实现hover效果

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
import { Directive, ElementRef, HostListener, Input } from '@angular/core';
@Directive({
selector: '[myHighlight]'
})
export class HighlightDirective {
constructor(private el: ElementRef) { }
@HostListener('mouseenter') onMouseEnter() {
this.highlight('red');
}
@HostListener('mouseleave') onMouseLeave() {
this.highlight(null);
}
private highlight(color: string) {
this.el.nativeElement.style.backgroundColor = color;
}
}
1
2
3
<button myHighlight class="btn">按钮一</button>
<button myHighlight class="btn">按钮二</button>
<button myHighlight class="btn">按钮三</button>
1
2
3
4
5
6
7
8
9
.btn{
height: 50px;
width: 100px;
background-color: #3399ff;
color: white;
border: 0;
outline: 0;
cursor: hand;
}

hover的效果直接参考Angular官网的代码。

20170303638742017-03-03 20_08_20.gif

指令实现click效果

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
import { Directive, ElementRef, HostListener, Input } from '@angular/core';
@Directive({
selector: '[myHighlight]'
})
export class HighlightDirective {
constructor(private el: ElementRef) { }
@HostListener('click') onMouseClick() {
this.clickhighlight("black");
}
private clickhighlight(color: string) {
let obj = this.el.nativeElement;
let btns = obj.parentNode.children;
//背景色全部重置
for(let i=0; i<btns.length; i++){
btns[i].style.backgroundColor = "#3399ff";
}
//设置当前点击对象的背景色
obj.style.backgroundColor = color;
}
}
1
2
3
4
5
<div>
<button myHighlight class="btn">按钮一</button>
<button myHighlight class="btn">按钮二</button>
<button myHighlight class="btn">按钮三</button>
</div>
1
2
3
4
5
6
7
8
9
.btn{
height: 50px;
width: 100px;
background-color: #3399ff;
color: white;
border: 0;
outline: 0;
cursor: hand;
}

click效果仍然用@HostListener装饰器引用属性型指令的宿主元素,首先把所有button的背景颜色重置,然后再设置当前点击对象的背景颜色,这样就达到了点击后背景颜色变化的效果。

2017030372042017-03-03 21_06_31.gif

指令实现click加hover效果

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
import { Directive, ElementRef, HostListener, Input } from '@angular/core';
@Directive({
selector: '[myHighlight]'
})
export class HighlightDirective {
constructor(private el: ElementRef) { }
@HostListener('click') onMouseClick() {
this.clickhighlight("black");
}
private clickhighlight(color: string) {
let obj = this.el.nativeElement;
let btns = obj.parentNode.children;
//背景色全部重置
for(let i=0; i<btns.length; i++){
btns[i].style.backgroundColor = "#3399ff";
}
//设置当前点击对象的背景色
obj.style.backgroundColor = color;
}
}
1
2
3
4
5
<div>
<button myHighlight class="btn">按钮一</button>
<button myHighlight class="btn">按钮二</button>
<button myHighlight class="btn">按钮三</button>
</div>
1
2
3
4
5
6
7
8
9
10
11
12
13
.btn{
height: 50px;
width: 100px;
background-color: #3399ff;
color: white;
border: 0;
outline: 0;
cursor: hand;
}
.btn:hover{
background: black !important;
}

配合上文click效果,只要加上一行css代码就可以实现click和hover的组合效果,此处务必使用hover伪类,并用!important来提升样式的优先级,如果用@HostListener装饰器,mouseenter、mouseleave、click三者会打架:

20170303334032017-03-03 21_21_47.gif

tc9011 wechat
欢迎订阅我的微信公众号
坚持原创技术分享,您的支持将鼓励我继续创作!