近来看到个不错的按钮点击效果，当点击时产生一次水波涟漪效果，挺好玩的，于是简单的实现了下(没考虑低版本浏览器兼容问题)
先看看效果吧，如下图（录制gif软件有点渣，看起来卡卡的...）
这种效果可以由元素内嵌套canves实现，也可以由css3实现。
Canves实现
网上摘了一份canves实现的代码，略微去掉了些重复定义的样式并且给出js注释，代码如下
html代码
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<
a
class
=
"btn color-1 material-design"
data-color
=
"#2f5398"
>Press me!</
a
>
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css代码
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* {
box-sizing: border-box;
outline: none;
}
body {
font-family:
'Open Sans'
;
font-size: 100%;
font-weight: 300;
line-height: 1.5em;
text-align: center;
}
.btn {
border: none;
display: inline-block;
color: white;
overflow: hidden;
margin: 1rem;
padding: 0;
width: 150px;
height: 40px;
text-align: center;
line-height: 40px;
border-radius: 5px;
}
.btn.color-1 {
background-color:
#426fc5;
}
.btn-border.color-1 {
background-color: transparent;
border: 2px solid
#426fc5;
color:
#426fc5;
}
.material-design {
position: relative;
}
.material-design canvas {
opacity: 0.25;
position: absolute;
top: 0;
left: 0;
}
.container {
align-content: center;
align-items: flex-start;
display: flex;
flex-direction: row;
flex-wrap: wrap;
justify-content: center;
margin: 0 auto;
max-width: 46rem;
}
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js代码
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var
canvas = {},
centerX = 0,
centerY = 0,
color =
''
,
containers = document.getElementsByClassName(
'material-design'
)
context = {},
element = {},
radius = 0,
// 根据callback生成requestAnimationFrame动画
requestAnimFrame =
function
() {
return
(
window.requestAnimationFrame ||
window.mozRequestAnimationFrame ||
window.oRequestAnimationFrame ||
window.msRequestAnimationFrame ||
function
(callback) {
window.setTimeout(callback, 1000 / 60);
}
);
} (),
// 为每个指定元素生成canves
init =
function
() {
containers = Array.prototype.slice.call(containers);
for
(
var
i = 0; i < containers.length; i += 1) {
canvas = document.createElement(
'canvas'
);
canvas.addEventListener(
'click'
, press,
false
);
containers[i].appendChild(canvas);
canvas.style.width =
'100%'
;
canvas.style.height=
'100%'
;
canvas.width = canvas.offsetWidth;
canvas.height = canvas.offsetHeight;
}
},
// 点击并且获取需要的数据，如点击坐标、元素大小、颜色
press =
function
(event) {
color = event.toElement.parentElement.dataset.color;
element = event.toElement;
context = element.getContext(
'2d'
);
radius = 0;
centerX = event.offsetX;
centerY = event.offsetY;
context.clearRect(0, 0, element.width, element.height);
draw();
},
// 绘制圆形，并且执行动画
draw =
function
() {
context.beginPath();
context.arc(centerX, centerY, radius, 0, 2 * Math.PI,
false
);
context.fillStyle = color;
context.fill();
radius += 2;
// 通过判断半径小于元素宽度，不断绘制 radius += 2 的圆形
if
(radius < element.width) {
requestAnimFrame(draw);
}
};
init();
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CSS3实现
接下来就是纯手打的代码了...觉得还是css3实现的方便些，可能是css写习惯了...
html代码
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<a class=
"waves ts-btn"
>Press me!</a>
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css代码
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.waves{
position:relative;
cursor:pointer;
display:inline-block;
overflow:hidden;
text-align: center;
-webkit-tap-highlight-color:transparent;
z-index:1;
}
.waves .waves-animation{
position:absolute;
border-radius:50%;
width:25px;
height:25px;
opacity:0;
background:rgba(255,255,255,0.3);
transition:all 0.7s ease-out;
transition-property:transform, opacity, -webkit-transform;
-webkit-transform:scale(0);
transform:scale(0);
pointer-events:none
}
.ts-btn{
width: 200px;
height: 56px;
line-height: 56px;
background:
#f57035;
color:
#fff;
border-radius: 5px;
}
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js代码
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document.addEventListener(
'DOMContentLoaded'
,
function
(){
var
duration = 750;
// 样式string拼凑
var
forStyle =
function
(position){
var
cssStr =
''
;
for
(
var
key
in
position){
if
(position.hasOwnProperty(key)) cssStr += key+
':'
+position[key]+
';'
;
};
return
cssStr;
}
// 获取鼠标点击位置
var
forRect =
function
(target){
var
position = {
top:0,
left:0
}, ele = document.documentElement;
'undefined'
!=
typeof
target.getBoundingClientRect && (position = target.getBoundingClientRect());
return
{
top: position.top + window.pageYOffset - ele.clientTop,
left: position.left + window.pageXOffset - ele.clientLeft
}
}
var
show =
function
(event){
var
pDiv = event.target,
cDiv = document.createElement(
'div'
);
pDiv.appendChild(cDiv);
var
rectObj = forRect(pDiv),
_height = event.pageY - rectObj.top,
_left = event.pageX - rectObj.left,
_scale =
'scale('
+ pDiv.clientWidth / 100 * 10 +
')'
;
var
position = {
top: _height+
'px'
,
left: _left+
'px'
};
cDiv.className = cDiv.className +
" waves-animation"
,
cDiv.setAttribute(
"style"
, forStyle(position)),
position[
"-webkit-transform"
] = _scale,
position[
"-moz-transform"
] = _scale,
position[
"-ms-transform"
] = _scale,
position[
"-o-transform"
] = _scale,
position.transform = _scale,
position.opacity =
"1"
,
position[
"-webkit-transition-duration"
] = duration +
"ms"
,
position[
"-moz-transition-duration"
] = duration +
"ms"
,
position[
"-o-transition-duration"
] = duration +
"ms"
,
position[
"transition-duration"
] = duration +
"ms"
,
position[
"-webkit-transition-timing-function"
] =
"cubic-bezier(0.250, 0.460, 0.450, 0.940)"
,
position[
"-moz-transition-timing-function"
] =
"cubic-bezier(0.250, 0.460, 0.450, 0.940)"
,
position[
"-o-transition-timing-function"
] =
"cubic-bezier(0.250, 0.460, 0.450, 0.940)"
,
position[
"transition-timing-function"
] =
"cubic-bezier(0.250, 0.460, 0.450, 0.940)"
,
cDiv.setAttribute(
"style"
, forStyle(position));
var
finishStyle = {
opacity: 0,
"-webkit-transition-duration"
: duration +
"ms"
,
// 过渡时间
"-moz-transition-duration"
: duration +
"ms"
,
"-o-transition-duration"
: duration +
"ms"
,
"transition-duration"
: duration +
"ms"
,
"-webkit-transform"
: _scale,
"-moz-transform"
: _scale,
"-ms-transform"
: _scale,
"-o-transform"
: _scale,
top: _height +
"px"
,
left: _left +
"px"
,
};
setTimeout(
function
(){
cDiv.setAttribute(
"style"
, forStyle(finishStyle));
setTimeout(
function
(){
pDiv.removeChild(cDiv);
},duration);
},100)
}
document.querySelector(
'.waves'
).addEventListener(
'click'
,
function
(e){
show(e);
},!1);
},!1);
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