javascript - 即使在JavaScript中刷新页面时，如何保持范围滑块的最后拖动位置

我有一个包含范围滑块的网页，该范围滑块具有三个值1,2,3，每个值将在图像中发生变化，现在我需要在页面上刷新短语以将范围滑块设置为我不想要的值我希望它即使在刷新页面时也能恢复其最后拖动的位置以及图像和短语
我的CSS代码:

<style>
  .rangeslider {
    width: 50%;
    margin: 0 auto;
    position: absolute;
  }
  .myslider {
    -webkit-appearance: none;
    background: white;
    width: 100%;
    height: 20px;
    opacity: 0.8;
    margin-top: 180px;
  }
  .myslider::-webkit-slider-thumb {
    -webkit-appearance: none;
    cursor: pointer;
    background: #000080;
    width: 33%;
    height: 20px;
  }
  .myslider:hover {
    opacity: 1;
  }
  .image {
    position: relative;
    width: 400px;
    margin: 0 auto;
  }
  .image>img {
    position: absolute;
    display: none;
  }
  .image>img.visible,
  .image>img:first-child {
    display: block;
  }
  #sliderOutput>div {
    display: none;
  }
  #sliderOutput>div.visible,
  #sliderOutput>div:first-child {
    display: block;
  }
  </style>

我的HTML代码:

<div class="image mt-3 mb-3" id="sliderImages">
  <img src="/static/images/1.jpg" width="400" height="180"><!--Image1-->
  <img src="/static/images/2.jpg" width="400" height="180"><!--Image2-->
  <img src="/static/images/3.jpg" width="400" height="180"><!--Image3-->
</div><br><!-- End of Image sliding-->
<!--Range slider starts-->
<div class="rangeslider">
  <input type="range" min="1" max="3" value="1" class="myslider" id="sliderRange" onload="showVal(this.value)">

  <div class="container">
    <div id="sliderOutput">
      <div class="col-4" id="range_1">
        <h6 class="display-6 mt-3" ><b><center>Starting from scratch</center></b></h6>
        <p class="demo"><center>I'm designing the room </p>
      </div>
      <div class="col-4" id="range_2">
        <h6 class="display-6 mt-3"><b>Somewhere in Between</b></h6>
        <p class="demo">I'm designing around a few pieces I already own</p>
      </div>
      <div class="col-4" id="range_3">
        <h6 class="display-6 mt-3"><b>Mostly furnished</b></h6>
        <p class="demo">I want to put the finishing touches on my room</p>
      </div>
    </div><!--End of Range slider-->

我的Js代码:

window.onload = function()
{
  var imagePath = "../static/images/";
  var localStorageSliderNumber;
  var localStorageImagePath;


  if (window.localStorage.getItem('sliderValue') != null) {
    localStorageSliderNumber = window.localStorage.getItem('sliderValue');
  } else {
    window.localStorage.setItem('sliderValue', '1');
    localStorageSliderNumber = 1;
  }
  if (window.localStorage.getItem('imagePath') != null) {
    imagePath = imagePath + window.localStorage.getItem('imagePath') + ".jpg";
  }
  var rangeslider = document.getElementById("sliderRange");
  var output = document.getElementById("sliderOutput");
  var images = document.getElementById("sliderImages");

  rangeslider.addEventListener('input', function() {
    for (var i = 0; i < output.children.length; i++) {
      output.children[i].style.display = 'none';
      images.children[i].style.display = 'none';
    }
    i = Number(this.value) - 1;
    output.children[i].style.display = 'block';
    images.children[i].style.display = 'block';
    window.localStorage.setItem('imagepath', rangeslider.getAttribute('value'));
    window.localStorage.setItem('sliderValue', (i+1));


});
}

在这里，我将值存储在本地存储中，即slidervalue，但是现在我想保留rangeslider的最后拖动位置以及短语和图像

       [1]: https://codepen.io/lakshmi123__/pen/abzYeLP

最佳答案

干得好。

您只需要在加载时调用setter方法即可。我所做的是，我分离了用于分别设置数据的通用代码，并在加载和值更改时都将其称为。这是更新的代码。

window.onload = function() {
  var imagePath = "../static/images/";
  var localStorageSliderNumber;
  var localStorageImagePath;
  if (window.localStorage.getItem('sliderValue') != null) {
    localStorageSliderNumber = window.localStorage.getItem('sliderValue');
  } else {
    window.localStorage.setItem('sliderValue', '1');
    localStorageSliderNumber = 1;
  }
  if (window.localStorage.getItem('imagePath') != null) {
    imagePath = imagePath + window.localStorage.getItem('imagePath') + ".jpg";
  }
  var rangeslider = document.getElementById("sliderRange");
  var output = document.getElementById("sliderOutput");
  var images = document.getElementById("sliderImages");
  rangeslider.value = localStorageSliderNumber;
  //The common line of code extracted into a method
  setData(rangeslider, output, images, localStorageSliderNumber);
  rangeslider.addEventListener('input', function() {
    //call the method once again
    setData(rangeslider, output, images, this.value);
  });
}

function setData(rangeslider, output, images, value) {
  for (var i = 0; i < output.children.length; i++) {
    output.children[i].style.display = 'none';
    images.children[i].style.display = 'none';
  }
  i = Number(value) - 1;

  output.children[i].style.display = 'block';
  images.children[i].style.display = 'block';
  window.localStorage.setItem('imagepath', rangeslider.getAttribute('value'));
  window.localStorage.setItem('sliderValue', (i + 1));
  window.localStorage.setItem('sliderPosition', (i + 1))
}

这是 Updated Pen