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Css 如何将div与图像维度进行zoom

我正在创建一个JS滑块之前和之后的图像.我有以下html、js和css:

main.html个

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge"> 
    <link rel="stylesheet" href="css/style.css">
</head>

<body>


<div class="mainSection">

    <div id="one" class="bal-container">
        <div class="bal-after">
            <img src="https://i.imgur.com/UhD5VoC.png">
            <div class="bal-afterPosition afterLabel">
                After
            </div>
        </div>

        <div class="bal-before">
            <div class="bal-before-inset">
                <img src="https://i.imgur.com/lQRgFqb.png">
                <div class="bal-beforePosition beforeLabel">
                    Before
                </div>
            </div>
        </div>

        <div class="bal-handle">
            <span class=" handle-left-arrow"></span>
            <span class="handle-right-arrow"></span>
        </div>

    </div>

    
</div>


<script>
class BeforeAfter {
    constructor(enteryObject) {

        const beforeAfterContainer = document.querySelector(enteryObject.id);
        const before = beforeAfterContainer.querySelector('.bal-before');
        const beforeText = beforeAfterContainer.querySelector('.bal-beforePosition');
        const afterText = beforeAfterContainer.querySelector('.bal-afterPosition');
        const handle = beforeAfterContainer.querySelector('.bal-handle');
        var widthChange = 0;

        beforeAfterContainer.querySelector('.bal-before-inset').setAttribute("style", "width: " + beforeAfterContainer.offsetWidth + "px;")
        window.onresize = function () {
            beforeAfterContainer.querySelector('.bal-before-inset').setAttribute("style", "width: " + beforeAfterContainer.offsetWidth + "px;")
        }
        before.setAttribute('style', "width: 50%;");
        handle.setAttribute('style', "left: 50%;");

        //touch screen event listener
        beforeAfterContainer.addEventListener("touchstart", (e) => {

            beforeAfterContainer.addEventListener("touchmove", (e2) => {
                let containerWidth = beforeAfterContainer.offsetWidth;
                let currentPoint = e2.changedTouches[0].clientX;

                let startOfDiv = beforeAfterContainer.offsetLeft;

                let modifiedCurrentPoint = currentPoint - startOfDiv;

                if (modifiedCurrentPoint > 10 && modifiedCurrentPoint < beforeAfterContainer.offsetWidth - 10) {
                    let newWidth = modifiedCurrentPoint * 100 / containerWidth;

                    before.setAttribute('style', "width:" + newWidth + "%;");
                    afterText.setAttribute('style', "z-index: 1;");
                    handle.setAttribute('style', "left:" + newWidth + "%;");
                }
            });
        });

        //mouse move event listener
        beforeAfterContainer.addEventListener('mousemove', (e) => {
            let containerWidth = beforeAfterContainer.offsetWidth;
            widthChange = e.offsetX;
            let newWidth = widthChange * 100 / containerWidth;

            if (e.offsetX > 10 && e.offsetX < beforeAfterContainer.offsetWidth - 10) {
                before.setAttribute('style', "width:" + newWidth + "%;");
                afterText.setAttribute('style', "z-index:" + "1;");
                handle.setAttribute('style', "left:" + newWidth + "%;");
            }
        })

    }
}

</script>

<script>
    new BeforeAfter({
        id: '#one'
    });
</script>

</body>

</html>

style.css个

@media all and (max-width: 479px) {
    .mainSection {
        display: flex;
        flex-direction: column;
        flex-wrap: nowrap;
        justify-content: space-around;
        align-items: stretch;
        align-content: stretch;
        width: 100%;
        height: 700px;
        padding: 10px;
    }
    .bal-container {
        margin: 10px 0;
    }
}

@media all and (max-width: 599px) {
    .mainSection {
        display: flex;
        flex-direction: column;
        flex-wrap: nowrap;
        justify-content: space-around;
        align-items: stretch;
        align-content: stretch;
        width: 100%;
        height: 800px;
        padding: 10px;
    }
    .bal-container {
        margin: 10px 0;
    }
}

@media all and (min-width: 480px) and (max-width: 768px) {
    .mainSection {
        display: flex;
        flex-direction: column;
        flex-wrap: nowrap;
        justify-content: space-around;
        align-items: stretch;
        align-content: stretch;
        width: 100%;
        height: 1000px;
        padding: 10px;
    }
    .bal-container {
        margin: 10px 0;
    }
}

@media all and (min-width: 768px) and (max-width: 959px) {
    .mainSection {
        display: flex;
        flex-direction: column;
        flex-wrap: nowrap;
        justify-content: space-around;
        align-items: stretch;
        align-content: stretch;
        width: 100%;
        height: 1100px;
        padding: 10px;
    }
    .bal-container {
        margin: 10px 0;
    }
}

@media all and (min-width: 960px) and (max-width: 1199px) {
    .mainSection {
        display: flex;
        flex-direction: row;
        flex-wrap: nowrap;
        justify-content: space-around;
        align-items: stretch;
        align-content: stretch;
        width: 100%;
        height: 500px;
        padding: 10px;
    }
    .bal-container {
        margin: 0 10px;
    }
}

@media all and (min-width: 1199px) {
    .mainSection {
        display: flex;
        flex-direction: row;
        flex-wrap: nowrap;
        justify-content: space-around;
        align-items: stretch;
        align-content: stretch;
        width: 100%;
        height: 500px;
        padding: 10px;
    }
    .bal-container {
        margin: 0 10px;
    }
}

/* Before After Container */ 
.bal-container {
    position: relative;
    width: 100%;
    height: 100%;
    cursor: grab;
    overflow: hidden;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.bal-after {
    display: block;
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.bal-before {
    display: block;
    position: absolute;
    top: 0;
    /* right: 0; */
    bottom: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 15;
    overflow: hidden;
}

.bal-before-inset {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
}

.bal-after img,
.bal-before img {
    object-fit: cover;
    position: absolute;
    width: 100%;
    height: 100%;
    object-position: 50% 50%;
    top: 0;
    bottom: 0;
    left: 0;
    -webkit-user-select: none;
    -khtml-user-select: none;
    -moz-user-select: none;
    -o-user-select: none;
    user-select: none;
}

.bal-beforePosition {
    background: #121212;
    color: #fff;
    left: 0;
    pointer-events: none;
    border-radius: 0.2rem;
    padding: 2px 10px;
}

.bal-afterPosition {
    background: #121212;
    color: #fff;
    right: 0;
    pointer-events: none;
    border-radius: 0.2rem;
    padding: 2px 10px;
}

.beforeLabel {
    position: absolute;
    bottom: 0;
    margin: 1rem;
    font-size: 1em;
    -webkit-user-select: none;
    -khtml-user-select: none;
    -moz-user-select: none;
    -o-user-select: none;
    user-select: none;
}

.afterLabel {
    position: absolute;
    bottom: 0;
    margin: 1rem;
    font-size: 1em;
    -webkit-user-select: none;
    -khtml-user-select: none;
    -moz-user-select: none;
    -o-user-select: none;
    user-select: none;
}

/* handle and arrow */
.bal-handle {
    height: 41px;
    width: 41px;
    position: absolute;
    left: 50%;
    top: 50%;
    margin-left: -20px;
    margin-top: -21px;
    border: 2px solid #fff;
    border-radius: 1000px;
    z-index: 20;
    pointer-events: none;
    box-shadow: 0 0 10px rgb(12, 12, 12);
}

.handle-left-arrow,
.handle-right-arrow {
    width: 0;
    height: 0;
    border: 6px inset transparent;
    position: absolute;
    top: 50%;
    margin-top: -6px;
}

.handle-left-arrow {
    border-right: 6px solid #fff;
    left: 50%;
    margin-left: -17px;
}

.handle-right-arrow {
    border-left: 6px solid #fff;
    right: 50%;
    margin-right: -17px;
}

.bal-handle::before {
    bottom: 50%;
    margin-bottom: 20px;
    box-shadow: 0 0 10px rgb(12, 12, 12);
}

.bal-handle::after {
    top: 50%;
    margin-top: 20.5px;
    box-shadow: 0 0 5px rgb(12, 12, 12);
}

.bal-handle::before,
.bal-handle::after {
    content: " ";
    display: block;
    width: 2px;
    background: #fff;
    height: 9999px;
    position: absolute;
    left: 50%;
    margin-left: -1.5px;
}

问题是，我现在所拥有的在图像上放大，图像并不完全可见.例如，我使用以下两张尺寸约为587x600的图像:https://imgur.com/a/YDdaZYR

任何 idea ，如何确保mainSectiondiv根据图像调整自己，使他们完全可见(如果图像被缩小到一定的尺寸，只要他们完全适合和好看).

推荐答案

你可以将.bal-after img&；.bal-before img的object-fit调整为contain，而不是cover，然后相应地调整容器的height.不知何故，就像这样:

@media all and (max-width: 479px) {
  .mainSection {
    display: flex;
    flex-direction: column;
    flex-wrap: nowrap;
    justify-content: space-around;
    align-items: stretch;
    align-content: stretch;
    width: 100%;
    height: 700px;
    padding: 10px;
  }
  .bal-container {
    margin: 10px 0;
  }
}

@media all and (max-width: 599px) {
  .mainSection {
    display: flex;
    flex-direction: column;
    flex-wrap: nowrap;
    justify-content: space-around;
    align-items: stretch;
    align-content: stretch;
    width: 100%;
    height: 800px;
    padding: 10px;
  }
  .bal-container {
    margin: 10px 0;
  }
}

@media all and (min-width: 480px) and (max-width: 768px) {
  .mainSection {
    display: flex;
    flex-direction: column;
    flex-wrap: nowrap;
    justify-content: space-around;
    align-items: stretch;
    align-content: stretch;
    width: 100%;
    height: 500px; /*was 1000px*/
    padding: 10px;
  }
  .bal-container {
    margin: 10px 0;
  }
}

@media all and (min-width: 768px) and (max-width: 959px) {
  .mainSection {
    display: flex;
    flex-direction: column;
    flex-wrap: nowrap;
    justify-content: space-around;
    align-items: stretch;
    align-content: stretch;
    width: 100%;
    height: 1100px;
    padding: 10px;
  }
  .bal-container {
    margin: 10px 0;
  }
}

@media all and (min-width: 960px) and (max-width: 1199px) {
  .mainSection {
    display: flex;
    flex-direction: row;
    flex-wrap: nowrap;
    justify-content: space-around;
    align-items: stretch;
    align-content: stretch;
    width: 100%;
    height: 500px;
    padding: 10px;
  }
  .bal-container {
    margin: 0 10px;
  }
}

@media all and (min-width: 1199px) {
  .mainSection {
    display: flex;
    flex-direction: row;
    flex-wrap: nowrap;
    justify-content: space-around;
    align-items: stretch;
    align-content: stretch;
    width: 100%;
    height: 500px;
    padding: 10px;
  }
  .bal-container {
    margin: 0 10px;
  }
}


/* Before After Container */

.bal-container {
  position: relative;
  width: 100%;
  height: 100%;
  cursor: grab;
  overflow: hidden;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.bal-after {
  display: block;
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
}

.bal-before {
  display: block;
  position: absolute;
  top: 0;
  /* right: 0; */
  bottom: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 15;
  overflow: hidden;
}

.bal-before-inset {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
}

.bal-after img,
.bal-before img {
  object-fit: contain; /*was cover*/
  position: absolute;
  width: 100%;
  height: 100%;
  object-position: 50% 50%;
  top: 0;
  bottom: 0;
  left: 0;
  -webkit-user-select: none;
  -khtml-user-select: none;
  -moz-user-select: none;
  -o-user-select: none;
  user-select: none;
}

.bal-beforePosition {
  background: #121212;
  color: #fff;
  left: 0;
  pointer-events: none;
  border-radius: 0.2rem;
  padding: 2px 10px;
}

.bal-afterPosition {
  background: #121212;
  color: #fff;
  right: 0;
  pointer-events: none;
  border-radius: 0.2rem;
  padding: 2px 10px;
}

.beforeLabel {
  position: absolute;
  bottom: 0;
  margin: 1rem;
  font-size: 1em;
  -webkit-user-select: none;
  -khtml-user-select: none;
  -moz-user-select: none;
  -o-user-select: none;
  user-select: none;
}

.afterLabel {
  position: absolute;
  bottom: 0;
  margin: 1rem;
  font-size: 1em;
  -webkit-user-select: none;
  -khtml-user-select: none;
  -moz-user-select: none;
  -o-user-select: none;
  user-select: none;
}


/* handle and arrow */

.bal-handle {
  height: 41px;
  width: 41px;
  position: absolute;
  left: 50%;
  top: 50%;
  margin-left: -20px;
  margin-top: -21px;
  border: 2px solid #fff;
  border-radius: 1000px;
  z-index: 20;
  pointer-events: none;
  box-shadow: 0 0 10px rgb(12, 12, 12);
}

.handle-left-arrow,
.handle-right-arrow {
  width: 0;
  height: 0;
  border: 6px inset transparent;
  position: absolute;
  top: 50%;
  margin-top: -6px;
}

.handle-left-arrow {
  border-right: 6px solid #fff;
  left: 50%;
  margin-left: -17px;
}

.handle-right-arrow {
  border-left: 6px solid #fff;
  right: 50%;
  margin-right: -17px;
}

.bal-handle::before {
  bottom: 50%;
  margin-bottom: 20px;
  box-shadow: 0 0 10px rgb(12, 12, 12);
}

.bal-handle::after {
  top: 50%;
  margin-top: 20.5px;
  box-shadow: 0 0 5px rgb(12, 12, 12);
}

.bal-handle::before,
.bal-handle::after {
  content: " ";
  display: block;
  width: 2px;
  background: #fff;
  height: 9999px;
  position: absolute;
  left: 50%;
  margin-left: -1.5px;
}
<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <link rel="stylesheet" href="css/style.css">
</head>

<body>


  <div class="mainSection">

    <div id="one" class="bal-container">
      <div class="bal-after">
        <img src="https://i.imgur.com/UhD5VoC.png">
        <div class="bal-afterPosition afterLabel">
          After
        </div>
      </div>

      <div class="bal-before">
        <div class="bal-before-inset">
          <img src="https://i.imgur.com/lQRgFqb.png">
          <div class="bal-beforePosition beforeLabel">
            Before
          </div>
        </div>
      </div>

      <div class="bal-handle">
        <span class=" handle-left-arrow"></span>
        <span class="handle-right-arrow"></span>
      </div>

    </div>


  </div>


  <script>
    class BeforeAfter {
      constructor(enteryObject) {

        const beforeAfterContainer = document.querySelector(enteryObject.id);
        const before = beforeAfterContainer.querySelector('.bal-before');
        const beforeText = beforeAfterContainer.querySelector('.bal-beforePosition');
        const afterText = beforeAfterContainer.querySelector('.bal-afterPosition');
        const handle = beforeAfterContainer.querySelector('.bal-handle');
        var widthChange = 0;

        beforeAfterContainer.querySelector('.bal-before-inset').setAttribute("style", "width: " + beforeAfterContainer.offsetWidth + "px;")
        window.onresize = function() {
          beforeAfterContainer.querySelector('.bal-before-inset').setAttribute("style", "width: " + beforeAfterContainer.offsetWidth + "px;")
        }
        before.setAttribute('style', "width: 50%;");
        handle.setAttribute('style', "left: 50%;");

        //touch screen event listener
        beforeAfterContainer.addEventListener("touchstart", (e) => {

          beforeAfterContainer.addEventListener("touchmove", (e2) => {
            let containerWidth = beforeAfterContainer.offsetWidth;
            let currentPoint = e2.changedTouches[0].clientX;

            let startOfDiv = beforeAfterContainer.offsetLeft;

            let modifiedCurrentPoint = currentPoint - startOfDiv;

            if (modifiedCurrentPoint > 10 && modifiedCurrentPoint < beforeAfterContainer.offsetWidth - 10) {
              let newWidth = modifiedCurrentPoint * 100 / containerWidth;

              before.setAttribute('style', "width:" + newWidth + "%;");
              afterText.setAttribute('style', "z-index: 1;");
              handle.setAttribute('style', "left:" + newWidth + "%;");
            }
          });
        });

        //mouse move event listener
        beforeAfterContainer.addEventListener('mousemove', (e) => {
          let containerWidth = beforeAfterContainer.offsetWidth;
          widthChange = e.offsetX;
          let newWidth = widthChange * 100 / containerWidth;

          if (e.offsetX > 10 && e.offsetX < beforeAfterContainer.offsetWidth - 10) {
            before.setAttribute('style', "width:" + newWidth + "%;");
            afterText.setAttribute('style', "z-index:" + "1;");
            handle.setAttribute('style', "left:" + newWidth + "%;");
          }
        })

      }
    }
  </script>

  <script>
    new BeforeAfter({
      id: '#one'
    });
  </script>

</body>

</html>

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