CSS之实现垂直时间线展示相关内容效果

如下，最近在工作中遇到实现时间线效果的需求，用纯css即可实现，下面给出详细实现代码。

　　

html：

<div class="time_line_list_wrap hide">
            <ul class="time_line">
              <li>
                <div class="time_line_item_wrap">
                  <span class="time">00:00:00</span>
                </div>
              </li>
              <li class="time_line_item_tmpl">
                <div class="time_line_item_wrap">
                  <span class="time"></span>
                  <div class="time_item_contain_wrap">
                    <img class="ppt_item_img_left">
                    <div class="item_contain_right">
                      <p class="ppt_name">中文课件名称超过了一定长度的字之后隐藏</p>
                      <span class="item_page_number">2/30</span>
                    </div>
                  </div>
                </div>
              </li>
            </ul>
          </div>

css:（此处用的less语法）

.time_line_list_wrap{
        width: 100%;
        height: 100%;
        overflow-y: scroll;
        overflow-x: hidden;
        background-color: #ffffff;
        padding: 0;
        flex-grow: 1;

        .time_line{
          padding: 16px 10px 0px 10px;
          li{
            list-style-type: none;
            position: relative;
            width: 2px;
            height: 102px;
            background-color: #e6e6e6;

            &.time_line_item_tmpl{
              display: none;
            }

            &:last-child{
              height: 0px;
            }

            &:first-child{
              height: 30px;
            }

            &:before{
              content: '';
              position: absolute;
              left: 50%;
              top: 0;
              transform: translateX(-50%);
              width: 8px;
              height: 8px;
              border-radius: 50%;
              background: inherit;
            }

            .time_line_item_wrap {
              width: 280px;
              margin-left: 10px;
              position: relative;
              bottom: 6px;

              &:last-child{
                margin-bottom: 20px;
              }

              &:first-child{
                margin-bottom: 0px;
              }

              .time{
                display: inline-block;
                width: 92px;
                height: 20px;
                line-height: 20px;
                font-size: 12px;
                color: #4a90e2;
                box-sizing: border-box;
                padding-left: 10px;
              }
              .time_item_contain_wrap{
                display: flex;
                padding: 10px 0 10px 9px;

                .ppt_item_img_left{
                  width: 80px;
                  height: 62px;
                  object-fit: contain;
                  flex-shrink: 0;
                }

                .item_contain_right{
                  font-size: 12px;
                  color: #696969;
                  font-weight: 500;
                  margin-left: 8px;
                  width: 68%;

                  .ppt_name{
                    .text-autocut();
                  }
                }
              }
            }
          }
        }

        &.hide{
          display: none;
        }
      }

js：

const $timeLineUl = $('.time_line')
const $timeLineItemTmpl = $('.time_line_item_tmpl').clone().removeClass('time_line_item_tmpl')

// 初始化侧边栏中时间线数据
      for (let i = 0; i < slideInfo.length; i += 1) {
        const currentSlide = slideInfo[i]
        const $timeLineItem = $timeLineItemTmpl.clone()
        $timeLineItem.find('.time').text(formatTime(currentSlide.recordTime / 1000).join(':'))
        $timeLineItem.find('.time').css({
          background: `url(${triangleTimeStr}) no-repeat center`,
        })
        $timeLineItem.find('.ppt_item_img_left').attr('src', currentSlide.slideUrl)
        $timeLineItem.find('.ppt_name').text(currentSlide.slideName)
        $timeLineItem.find('.item_page_number').text(`${currentSlide.currentPageNumber}/${currentSlide.totalPageNumber}`)
        $timeLineUl.append($timeLineItem)
      }

注意此处，需要用find()方法来查找后代元素，.children()方法是查找直接后代（儿子辈）的元素，.find()方法是查找所有后代元素（包括儿子、孙子、孙子的孙子及更多）。