悬停时的CSS波纹效果？

Question

我有一个按钮，我想要一个稍微透明的覆盖层，以便在悬停时“滑过”按钮。

有一种叫做“涟漪效应”的东西，您通常可以通过单击按钮来实现。

喜欢这里：https://codepen.io/tomma5o/pen/zwyKya

HTML：

<div class="container">
    <a data-animation="ripple">Click Me</a>
</div>

CSS：

:root {
    /* if u want to change the color of
     * the ripple change this value
    */
    --color-ripple: rgba(255,255,255,0.8);
}

body {
    background: #36353c;
}

.container {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    height: 50px;
    width: 200px;
    margin: auto;
}
*[data-animation="ripple"] {
    position: relative; /*Position relative is required*/
    height: 100%;
    width: 100%;
    display: block;
    outline: none;:root {
    /* if u want to change the color of
     * the ripple change this value
    */
    --color-ripple: rgba(255, 255, 255, 0.8);
}

body {
    background: #36353c;
}

.container {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    height: 50px;
    width: 200px;
    margin: auto;
}
*[data-animation="ripple"] {
    position: relative; /*Position relative is required*/
    height: 100%;
    width: 100%;
    display: block;
    outline: none;
    padding: 20px;
    color: #fff;
    text-transform: uppercase;
    background: linear-gradient(135deg, #e570e7 0%, #79f1fc 100%);
    box-sizing: border-box;
    text-align: center;
    line-height: 14px;
    font-family: roboto, helvetica;
    font-weight: 200;
    letter-spacing: 1px;
    text-decoration: none;
    box-shadow: 0 5px 3px rgba(0, 0, 0, 0.3);
    cursor: pointer;
    /*border-radius: 50px;*/
    -webkit-tap-highlight-color: transparent;
}

*[data-animation="ripple"]:focus {
    outline: none;
}

*[data-animation="ripple"]::selection {
    background: transparent;
    pointer-events: none;
}

    padding: 20px;
    color: #fff;
    text-transform: uppercase;
    background: linear-gradient(135deg, #e570e7 0%,#79f1fc 100%);
    box-sizing: border-box;
    text-align: center;
    line-height: 14px;
    font-family: roboto, helvetica;
    font-weight: 200;
    letter-spacing: 1px;
    text-decoration: none;
    box-shadow: 0 5px 3px rgba(0, 0, 0, 0.3);
    cursor: pointer;
  /*border-radius: 50px;*/
    -webkit-tap-highlight-color: transparent;
}

*[data-animation="ripple"]:focus {
    outline: none;
}

*[data-animation="ripple"]::selection {
    background: transparent;
    pointer-events: none;
}

JS：

const isMobile = window.navigator.userAgent.match(/Mobile/) && window.navigator.userAgent.match(/Mobile/)[0] === "Mobile";
const event = isMobile ? "touchstart" : "click";

const button = document.querySelectorAll('*[data-animation="ripple"]'),
            container = document.querySelector(".container");

for (var i = 0; i < button.length; i++) {
    const currentBtn = button[i];

    currentBtn.addEventListener(event, function(e) {

        e.preventDefault();
        const button = e.target,
                    rect = button.getBoundingClientRect(),
                    originalBtn = this,
                    btnHeight = rect.height,
                    btnWidth = rect.width;
        let posMouseX = 0,
                posMouseY = 0;

        if (isMobile) {
            posMouseX = e.changedTouches[0].pageX - rect.left;
            posMouseY = e.changedTouches[0].pageY - rect.top;
        } else {
            posMouseX = e.x - rect.left;
            posMouseY = e.y - rect.top;
        }

        const baseCSS =  `position: absolute;
                                            width: ${btnWidth * 2}px;
                                            height: ${btnWidth * 2}px;
                                            transition: all linear 700ms;
                                            transition-timing-function:cubic-bezier(0.250, 0.460, 0.450, 0.940);
                                            border-radius: 50%;
                                            background: var(--color-ripple);
                                            top:${posMouseY - btnWidth}px;
                                            left:${posMouseX - btnWidth}px;
                                            pointer-events: none;
                                            transform:scale(0)`

        var rippleEffect = document.createElement("span");
        rippleEffect.style.cssText = baseCSS;

        //prepare the dom
        currentBtn.style.overflow = "hidden";
        this.appendChild(rippleEffect);

        //start animation
        setTimeout( function() { 
            rippleEffect.style.cssText = baseCSS + `transform:scale(1); opacity: 0;`;
        }, 5);

        setTimeout( function() {
            rippleEffect.remove();
            //window.location.href = currentBtn.href;
        },700);
    })
}

是否有可能实现类似的东西而无需单击按钮而只需将鼠标悬停在它上面？

Answer 1

替换 JS 的第 2 行：

const event = isMobile ? "touchstart" : "click";

与：

const event = isMobile ? "touchstart" : "mouseover";

这样就可以了。

希望有帮助！

Answer 2

如果您希望波纹原点固定（例如从中间）而不是从鼠标进入的任何地方，答案要简单得多并且不需要 javascript：只需堆叠一个半透明的圆形伪元素并为比例设置动画悬停时。

body {
	background: #36353c;
}

.container {
	position: absolute;
	top: 0;
	left: 0;
	right: 0;
	bottom: 0;
	height: 50px;
	width: 200px;
	margin: auto;
}
.ripple{
	position: relative; /*Position relative is required*/
	height: 100%;
	width: 100%;
	display: block;
	outline: none;
	padding: 20px;
	color: #fff;
	text-transform: uppercase;
	background: linear-gradient(135deg, #e570e7 0%,#79f1fc 100%);
	box-sizing: border-box;
	text-align: center;
	line-height: 14px;
	font-family: roboto, helvetica;
	font-weight: 200;
	letter-spacing: 1px;
	text-decoration: none;
	box-shadow: 0 5px 3px rgba(0, 0, 0, 0.3);
	cursor: pointer;
	overflow:hidden;
}

.ripple:hover:before{
	animation: ripple 1s ease;
}

.ripple:before{
	content:"";
	position:absolute; top:0; left:0;
	width:100%; height:100%;
  background-color:rgba(255, 255, 255, 0.7);
  border-radius:50%;
	transform:scale(0);
}

@keyframes ripple{
	from{transform:scale(0); opacity:1;}
	to{transform:scale(3);opacity:0;}
}

<div class="container">
	<a class="ripple">Hover Me</a>
</div>