点击按钮出现水波纹动画

效果如下:

点击按钮出现水波纹动画

思路:

  按钮及按钮的父标签定位需为绝对定位或相对定位

  绑定按钮的click事件,把其样式设置为overflow:hidden,并添加下标线标签并设置其样式

  当鼠标点击按钮时,如果按钮内有标签(波兰纹)即把该标签删掉,

  然后给按钮添加一个新的标签(波浪纹),  注:必须先添加标签然后计算标签样式再更改其相应样式,如果先计算样式然后添加标签后立即接修改其样式,有可能出现修改样式时获取不到标签的问题;

  获取目标事件的位置pageX和pageY,及按钮距离页面的左边和顶部的距离,通过计算获取标签(波浪纹)的top,left,width,height值(宽高为按钮的两倍),

  先把标签(波浪纹)缩放值设为0,transition为.4s,然后再修改其缩放值为1.5,透明度为0,并通过调用animate方法在实现动画效果后删除该标签

  按钮的active类名作用: 用来判断是否需要修改下标线的位置及宽度

  使用时调用按钮父标签的wave方法(按钮类名是必传的)

示例代码:

  CSS:

.ul{display:flex; display:-webkit-flex; position:relative; width:600px; margin:auto; text-align:center; color:white;cursor: pointer;}
.ul .li{position:relative; width:200px; height:60px; line-height:60px; background: orange;}

  HTML:

<div class="ul">
    <div class="li">TAG FIRST</div>
    <div class="li">TAG SECOND</div>
    <div class="li">TAG THIRD</div>
</div>
<script id="jquery_183" type="text/javascript" class="library" src="http://code.jquery.com/jquery-latest.js"></script>

  JS:

;(function($){
    $.fn.wave=function(options){
        var defaults={
            lineColor: 'white',//默认下标线颜色
            lineHeight: 4,//默认下标线高度
            waveColor: 'lightblue',//默认波浪颜色
            index: 0//默认选中标签下标
        }
    var options= $.extend({}, defaults, options);
        this.each(function(){
            var $this = $(this);
            var $buttons = $('.'+options.btnClass, $this);
            $this.append(`<div class="line" style="position:absolute;transition:.5s;-webkit-transition:.5s;-moz-transition:.5s;-o-transition:.5s;bottom:0;left:${$buttons[options.index].offsetLeft}px;${$buttons[options.index].clientWidth}px;height:${options.lineHeight}px;background:${options.lineColor};"><div>`);
            var $line = $('.line', $this),//下标线
                    leftDistance = getLeftDistance(this),//按钮父元素到页面左边的距离
                    topDistance = getTopDistance(this);//按钮父元素到页面顶端的距离
            $buttons.each(function(){
                $(this).css("overflow","hidden").click(function(e){
                    var event = e || event; 
                    var $this = $(this);
                    $(".wave",$this).remove();
                    $this.append(`<div class="wave" style="position:absolute;transform:scale(0);-webkit-transform:scale(0);border-radius:50%;background:${options.waveColor};opacity:0.4;"></div>`);
                    var x = event.pageX,//鼠标位置到页面左边的距离(包括滚动距离)
                         y = event.pageY,//鼠标位置到页面顶端的距离(包括滚动距离)
                         w = this.clientWidth,//按钮的宽
                         h = this.clientHeight,//按钮的高
                         offsetLeft = this.offsetLeft,//按钮到其父元素左边的距离
                         offsetTop = this.offsetTop,//按钮到其父元素顶端的距离
                         left = leftDistance + offsetLeft,
                         top = topDistance + offsetTop;
                 if(w > h){
                        h = w;
                    }else{
                        w = h;
                    }
                    var left = x - w - left,
                            top = y - h - top;
                    var $wave = $('.wave', $this);
                    if(!$this.hasClass('active')){
                        $this.addClass('active').siblings().removeClass('active');
                        $line.css({left: offsetLeft,  w});
                    }
                    var transition = prefixStyle('transition');
                    var transform = prefixStyle('transform');
                    var css_first = {
                         w * 2+'px',
                        height: h * 2 + 'px',
                        left: left + 'px',
                        top: top + 'px'
                    }
                    var css_second = {
                        opacity: 0
                    }
                    css_first[transition] = '.4s linear';
                    css_second[transform] = 'scale(1.5)';
                    $wave.css(css_first).css(css_second).animate({opacity: 0},400,function(){
                        $(this).remove()
                    });
                })
            })
        });
        return this;
    }
})(jQuery)
    
//调用方式:
window.onload = function(){
    $('.ul').wave({
      lineColor:'red', //下标线颜色
      lineHeight: 4, //下标线高度
      waveColor: 'lightgray', //波浪颜色
      index: 0, //选中标签下标
      btnClass: 'li' //按钮类名(必须传)
  });
}
        
/****  公用方法  ****/
    
//获取标签距离文档左边的距离:
var elementStyle = document.createElement('div').style;
function getLeftDistance (element){
    var actualLeft = element.offsetLeft,
            current = element.offsetParent;
    while (current !== null){
        actualLeft += current.offsetLeft;
        current = current.offsetParent;
    }
    return actualLeft;
}
//获取标签距离文档上边的距离:
function getTopDistance (element){
    var actualTop = element.offsetTop,
            current = element.offsetParent;
    while (current !== null){
        actualTop += current. offsetTop;
        current = current.offsetParent;
    }
    return actualTop;
}
//获取样式前缀
var vendor = (() => {
  var transformNames = {
        webkit: 'webkitTransform',
        Moz: 'MozTransform',
        O: 'OTransform',
        ms: 'msTransform',
        standard: 'transform'
    }
    for (var key in transformNames) {
        if (elementStyle[transformNames[key]] !== undefined) {
            return key
        }
    }
    return false
})()
//获取样式属性(带前缀)
function prefixStyle (style) {
    if (vendor === false) {
        return false
    }
    if (vendor === 'standard') {
        return style
    }
    return vendor + style.charAt(0).toUpperCase() + style.substr(1)
}
        
/****  公用方法  ****/

在线演示:http://sandbox.runjs.cn/show/tt9xdkvx