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    专注web开发技术分享

    原生图片详情定位效果

    技术 149 2022-04-01 17:34

    先来看看效果图:

    需要一些位置计算..

    参考https://www.cnblogs.com/wang715100018066/p/13607330.html 的图片详情效果。。显然没有完全一样

    但是凑合吧 后面在优化

    比较关键的api还是之前计算图片位置的文章 相关的api - getBoundingClientRect

    直接上代码吧:

    <!DOCTYPE html>
    <html lang="en">
      <head>
        <meta charset="UTF-8" />
        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
        <title>Document</title>
      </head>
    
      <style>
        .priview {
          position: fixed;
          top: 0;
          right: 0;
          bottom: 0;
          left: 0;
          transition: opacity 0.3s;
          will-change: opacity;
          cursor: zoom-out;
          display: none;
          opacity: 0;
          background: rgba(0, 0, 0, 0.8) !important;
        }
    
        .priview.show {
          display: block;
          opacity: 1;
        }
    
        .priview img {
          position: absolute;
          width: 500px;
          transition: transform 0.3s cubic-bezier(0.2, 0, 0.2, 1) !important;
        }
    
        #content {
          margin: auto;
          text-align: center;
          border: 1px solid gainsboro;
        }
    
        #content img {
          margin: 50px;
        }
      </style>
      <body>
        <div id="content">
          <img
            src="http://biaoblog.cn:3000/uploads/1648023950605.gif"
            width="400px"
            alt=""
            id="myImg"
          />
        </div>
    
        <div class="priview">
          <img class="priviewImg" src="" alt="" />
        </div>
      </body>
    
      <script>
        const getDom = (dom) => {
          return document.querySelector(dom);
        };
        let imgDom = getDom("#myImg");
        let priview = getDom(".priview");
    
        let str = "";
    
        for (let i = 0; i < 10; i++) {
          str += `<img
            src="http://biaoblog.cn:3000/uploads/1648023950605.gif"
            width="400px"
            alt=""
            onclick="showPriview(event)"
          />`;
        }
    
        document.querySelector("#content").innerHTML = str;
    
        function showPriview(e) {
          // 1.先渲染
          let rectObject = e.target.getBoundingClientRect();
          let priviewStyle = `style="left:${rectObject.left}px;top:${rectObject.top}px;transform:scale(1.02945) translate3d(0px,0px,0);"`;
          priview.classList.add("show");
          priview.innerHTML = `<img class="priviewImg" src="${imgDom.src}" ${priviewStyle}/>`;
    
          document.body.style.overflow = "hidden";
          // 2.计算垂直居中的偏移值 进行动画效果
          let priviewImg = getDom(".priviewImg");
          let priviewImgObject = priviewImg.getBoundingClientRect();
          let windowWidth = document.body.clientWidth;
          let windowHeight = document.documentElement.clientHeight; //这里获取可见高度 不能用body.clientHeight 如果有scroll就不准了 只考虑一屏的高度
          let leftOfest =
            (windowWidth - priviewImg.clientWidth) / 2 - priviewImgObject.left;
          let topOfest =
            (windowHeight - priviewImg.clientHeight) / 2 - priviewImgObject.top;
          priviewImg.style.transform = `scale(1.02945) translate3d(${leftOfest}px,${topOfest}px,0)`;
    
          let priviewShow = getDom(".priview.show");
          let priviewImgShow = getDom(".priview.show .priviewImg");
          if (priviewShow && priviewImgShow) {
            priviewShow.onclick = () => {
              priviewImgShow.style.transform = `scale(1.02945) translate3d(0px,0px,0)`;
              priviewImgShow.style.background = "transparent";
              setTimeout(() => {
                document.body.style.overflow = "scroll";
                priviewShow.classList.remove("show");
              }, 280);
            };
          }
        }
      </script>
    </html>
    

    后续:进行了一波优化:其实就是加了一个透明度的动画效果....

    效果图:

    上代码:

    <!DOCTYPE html>
    <html lang="en">
      <head>
        <meta charset="UTF-8" />
        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
        <title>Document</title>
      </head>
    
      <style>
        .priview {
          position: fixed;
          top: 0;
          right: 0;
          bottom: 0;
          left: 0;
          transition: opacity 0.5s;
          will-change: opacity;
          cursor: zoom-out;
          display: none;
          background: rgba(0, 0, 0, 0.8) !important;
          opacity: 0;
        }
    
        .priview.show {
          display: block;
        }
    
        .priview img {
          position: absolute;
          width: 500px;
          transition: transform 0.3s cubic-bezier(0.2, 0, 0.2, 1) !important;
        }
    
        #content {
          margin: auto;
          text-align: center;
          border: 1px solid gainsboro;
        }
    
        #content img {
          margin: 50px;
        }
      </style>
      <body>
        <div id="content"></div>
    
        <div class="priview">
          <img class="priviewImg" src="" alt="" />
        </div>
      </body>
    
      <script>
        const getDom = (dom) => {
          return document.querySelector(dom);
        };
        let imgDom = getDom("#myImg");
        let priview = getDom(".priview");
    
        let str = "";
    
        for (let i = 0; i < 10; i++) {
          str += `<img
            src="http://biaoblog.cn:3000/uploads/1619422830443.jpg"
            width="400px"
            alt=""
            onclick="showPriview(event)"
            id="myImg"
          />`;
        }
    
        const sleep = async (time) => {
          return new Promise((resolve) => {
            setTimeout(() => {
              resolve();
            }, time);
          });
        };
    
        document.querySelector("#content").innerHTML = str;
        async function showPriview(e) {
          priview.classList.add("show");
          await sleep(10);
          priview.style.opacity = 1;
          // 1.先渲染
          let rectObject = e.target.getBoundingClientRect();
          let priviewStyle = `style="left:${rectObject.left}px;top:${rectObject.top}px;transform:scale(1.02945) translate3d(0px,0px,0);"`;
          priview.innerHTML = `<img class="priviewImg" src="${e.target.src}" ${priviewStyle}/>`;
          document.body.style.overflow = "hidden";
          // 2.计算垂直居中的偏移值 进行动画效果
          let priviewImg = getDom(".priviewImg");
          let priviewImgObject = priviewImg.getBoundingClientRect();
          let windowWidth = document.body.clientWidth;
          let windowHeight = document.documentElement.clientHeight; //这里获取可见高度 不能用body.clientHeight 如果有scroll就不准了 只考虑一屏的高度
          let leftOfest =
            (windowWidth - priviewImg.clientWidth) / 2 - priviewImgObject.left;
          let topOfest =
            (windowHeight - priviewImg.clientHeight) / 2 - priviewImgObject.top;
          priviewImg.style.transform = `scale(1.02945) translate3d(${leftOfest}px,${topOfest}px,0)`;
    
          let priviewShow = getDom(".priview.show");
          let priviewImgShow = getDom(".priview.show .priviewImg");
          e.target.style.opacity = 0;
          if (priviewShow && priviewImgShow) {
            priviewShow.onclick = async () => {
              priviewImgShow.style.transform = `scale(1.02945) translate3d(0px,0px,0)`;
              await sleep(300);
              e.target.style.opacity = 1;
              document.body.style.overflow = "scroll";
              priview.style.opacity = 0;
              console.log("time1");
    
              await sleep(300);
              priviewShow.classList.remove("show");
            };
          }
        }
      </script>
    </html>
    

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