基于JS+Canves实现点击水波纹功能

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

< a class = "btn color-1 material-design" data-color = "#2f5398" >Press me! a >

css代码

* {
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;
}

js代码

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();

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

"waves ts-btn" >Press me!

css代码

.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;
}

js代码

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);