CSS3 makes responsive, configurable lottery wheel

This time I will bring you CSS3 to make a responsive and configurable lottery carousel. What are the things to note about using CSS3 to make a responsive and configurable lottery carousel. The following is a practical case. Get up and take a look.

Due to the initial popular beta period of the WeChat mini program some time ago, the big carousel lottery that was previously implemented using Canvas was transplanted into the WeChat mini program. Unfortunately, the mini program did not have enough support for Canvas at that time. Perfect, I had to reduce it to CSS3. Although it is not as gorgeous as Canvas drawing, I finally completed a lottery demo. For details, see: http://xiazai.jb51.net/201701/yuanma/wechat-canvas_jb51.rar

Thinking about it afterwards, CSS3 implementation is not without its benefits. For example, it is simple, fast, easy to debug, and rendering is more efficient than Canvas. More importantly, it supports

media query, and the large carousel can also be made responsive. of. So I took the time to sort it out, use pure CSS3 to implement a large carousel lottery demo and record it.

If you have similar needs and don’t want to bother with the details, you can go here - Canvas’ complete big carousel lottery project (can be used directly) http://xiazai.jb51.net/201701/yuanma/ canvas_jb51.rar

The code will be pasted directly below.

Code

HTML

<section class="gb-wheel-container" id="gbWheel">
    <p class="gb-wheel-content gb-wheel-run">
        <ul class="gb-wheel-line"></ul>
        <p class="gb-wheel-list"></p>
    </p>
    <a href="javascript:;" class="gb-wheel-btn" id="gbLottery">抽奖</a>     
</section>

JS

(function() {
    // 奖品配置
    var awards = [
            {'index': 0, 'text': '耳机' , 'name': 'icono-headphone'},
            {'index': 1, 'text': 'iPhone' , 'name': 'icono-iphone'},
            {'index': 2, 'text': '相机' , 'name': 'icono-camera'},
            {'index': 3, 'text': '咖啡杯' , 'name': 'icono-cup'},
            {'index': 4, 'text': '日历', 'name': 'icono-calendar'},
            {'index': 5, 'text': '键盘', 'name': 'icono-keyboard'}
        ],
        len = awards.length,
        turnNum = 1 / len;  // 文字旋转 turn 值
    var gbWheel = $('gbWheel'),
        lineList = gbWheel.querySelector('ul.gb-wheel-line'),
        itemList = gbWheel.querySelector('.gb-wheel-list'),
        lineListHtml = [],
        itemListHtml = [];
    var transform = preTransform();
    awards.forEach(function(v, i, a) {
        // 分隔线
        lineListHtml.push('<li class="gb-wheel-litem" style="&#39; + transform + &#39;: rotate(&#39;+ (i * turnNum + turnNum / 2) +&#39;turn)"></li>');
        // 奖项
        itemListHtml.push('<p class="gb-wheel-item">');
        itemListHtml.push('<p class="gb-wheel-icontent" style="&#39; + transform + &#39;: rotate(&#39;+ (i * turnNum) +&#39;turn)">');
        itemListHtml.push('<p class="gb-wheel-iicon">');
        itemListHtml.push('<i class="&#39;+v.name+&#39;"></i>');
        itemListHtml.push('</p>');
        itemListHtml.push('<p class="gb-wheel-itext">');
        itemListHtml.push(v.text);
        itemListHtml.push('</p>');
        itemListHtml.push('</p>');
        itemListHtml.push('</p>');
    });           
    lineList.innerHTML = lineListHtml.join('');
    itemList.innerHTML = itemListHtml.join('');
    function $(id) {
        return document.getElementById(id);
    };
    // 旋转
    var i = 0;
    $('gbLottery').onclick = function() {
        i++;
        gbWheel.querySelector('.gb-wheel-content').style = transform + ': rotate('+ i * 3600 +'deg)';  
    }
    // transform兼容
    function preTransform() {
        var cssPrefix,
        vendors = {
          '': '',
          Webkit: 'webkit',
          Moz: '',
          O: 'o',
          ms: 'ms'
        },
        testEle = document.createElement('p'),
        cssSupport = {};
         // 嗅探特性
        Object.keys(vendors).some(function(vendor) {
            if (testEle.style[vendor + (vendor ? 'T' : 't') + 'ransform'] !== undefined) {
              cssPrefix = vendor ? '-' + vendor.toLowerCase() + '-' : '';
              return true;
            }
        });
      function normalizeCss(name) {
        name = name.toLowerCase();
        return cssPrefix ? cssPrefix + name : name;
      }
      cssSupport = {
        transform: normalizeCss('Transform'),
      }
      return cssSupport.transform;
    }
}());

CSS

html {
    font-size: 10px
}
.gb-wheel-container ul,
.gb-wheel-container li,
.gb-wheel-container p {
    margin: 0;
    padding: 0
}
.gb-wheel-container ul,
.gb-wheel-container li {
    list-style: none
}
.gb-wheel-container {
    margin: 0 auto;
    position: relative;
    width: 30rem;
    height: 30rem;
    border-radius: 50%;
    box-shadow: 0 2px 3px #333, 0 0 2px #000;
    overflow: hidden
}
.gb-wheel-content {
    position: absolute;
    left: 1rem;
    top: 1rem;
    z-index: 2;
    width: 28rem;
    height: 28rem;
    box-sizing: border-box;
    border-radius: inherit;
    background-clip: padding-box;
    background: -webkit-radial-gradient(rgba(100, 100, 100, 0.1) 15%, transparent 16%) 0 0,  
                -webkit-radial-gradient(rgba(100, 100, 100, 0.1) 15%, transparent 16%) 8px 8px,  
  -webkit-radial-gradient(rgba(255, 255, 255, 0.1) 15%, transparent 20%) 0 1px,
  -webkit-radial-gradient(rgba(255, 255, 255, 0.1) 15%, transparent 20%) 8px 9px;
    background: radial-gradient(rgba(100, 100, 100, 0.1) 15%, transparent 16%) 0 0,
                radial-gradient(rgba(100, 100, 100, 0.1) 15%, transparent 16%) 8px 8px, 
  radial-gradient(rgba(255, 255, 255, 0.1) 15%, transparent 20%) 0 1px, 
  radial-gradient(rgba(255, 255, 255, 0.1) 15%, transparent 20%) 8px 9px;
    background-color: #ffcb3f;
    background-size: 12px 14px
}
.gb-wheel-content:before {
    content: ' ';
    position: absolute;
    left: -1rem;
    top: -1rem;
    z-index: -1;
    width: 28rem;
    height: 28rem;
    border-radius: inherit;
    border: 1rem solid #E44025;
    box-shadow: 0 0 2px 2px rgba(0, 0, 0, 0.2) inset
}
.gb-wheel-list {
    position: absolute;
    left: 0;
    top: 0;
    width: inherit;
    height: inherit;
    z-index: 9999
}
.gb-wheel-item {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    color: #e4370e;
    font-weight: bold;
    text-shadow: 0 1px 1px rgba(255, 255, 255, 0.6)
}
.gb-wheel-icontent {
    position: relative;
    display: block;
    padding-top: 1.5rem;
    margin: 0 auto;
    text-align: center;
    -webkit-transform-origin: 50% 14rem;
    -ms-transform-origin: 50% 14rem;
    transform-origin: 50% 14rem
}
.gb-wheel-itext {
    font-size: 1.4rem;
    font-weight: lighter
}
.gb-wheel-iicon [class*=icono-] {
    color: #e4370e
}
.gb-wheel-line {
    position: absolute;
    left: 0;
    top: 0;
    width: inherit;
    height: inherit;
    z-index: 99
}
.gb-wheel-litem {
    position: absolute;
    left: 14rem;
    top: 0;
    width: 1px;
    height: 14rem;
    background-color: rgba(228, 55, 14, 0.6);
    overflow: hidden;
    -webkit-transform-origin: 50% 14rem;
    -ms-transform-origin: 50% 14rem;
    transform-origin: 50% 14rem
}
.gb-wheel-btn {
    position: absolute;
    left: 11rem;
    top: 11rem;
    z-index: 400;
    width: 8rem;
    height: 8rem;
    border-radius: 50%;
    color: #F4E9CC;
    background-color: #E44025;
    line-height: 8rem;
    text-align: center;
    font-size: 2rem;
    text-shadow: 0 -1px 1px rgba(0, 0, 0, 0.6);
    box-shadow: 0 3px 5px rgba(0, 0, 0, 0.6), 0 0 5px 4px rgba(0, 0, 0, 0.2) inset;
    text-decoration: none
}
a.gb-wheel-btn {
    border-bottom: none
}
.gb-wheel-btn::after {
    position: absolute;
    content: '';
    left: 2.5rem;
    top: -1rem;
    width: 3rem;
    height: 3rem;
    background-color: #E44025;
    -webkit-transform: rotate(45deg);
    -ms-transform: rotate(45deg);
    transform: rotate(45deg);
    box-shadow: 0 3px 5px rgba(0, 0, 0, 0.6), 0 0 5px 4px rgba(0, 0, 0, 0.2) inset
}
.gb-wheel-btn.disabled,
.gb-wheel-btn.disabled::after {
    pointer-events: none;
    background: #B07A7B;
    color: #ccc
}
.gb-wheel-run {
    -webkit-transition: transform 6s ease;
    transition: transform 6s ease
}
@media only screen and (min-width: 320px) {
    html {
        font-size: 10px
    }
}
@media only screen and (min-width: 375px) {
    html {
        font-size: 11.71875px
    }
}
@media only screen and (min-width: 480px) {
    html {
        font-size: 15px
    }
}

I believe you have read the case in this article After mastering the method, please pay attention to other related articles on the php Chinese website for more exciting content!

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