javascript - JavaScript 在最后一个 div 停止水平滚动

Question

嗨，我正在尝试创建一个类似轮播的对象，您可以在其中单击左右以仅使用 HTML、CSS 和 JavaScript 在上一个和下一个图像之间查看。这是代码：

const container = document.querySelector(".container");
const lefty = document.querySelector(".lefty");
let translate = 0;

lefty.addEventListener("click", function() {
  translate += 200;
  container.style.transform = "translateX(" + translate + "px" + ")";
});

const righty = document.querySelector(".righty");
righty.addEventListener("click", function() {
  translate -= 200;
  container.style.transform = "translateX(" + translate + "px" + ")";
});

.outer {
  overflow-x: hidden;
  overflow-y: hidden;
}

.container {
  display: flex;
  transition: transform .4s ease-in;
}

.inner {
  flex: 0 0 25%;
  height: 100px;
  margin: 10px;
}

.paddle {
  position: absolute;
  top: 50px;
  bottom: 0;
  width: 30px;
  height: 20px;
}

.lefty {
  left: 0;
  z-index: 1;
}

.righty {
  right: 0;
  z-index: 1;
}

<button class="lefty paddle" id="left-button"></button>
<div class="outer" id="content">
  <div class="container">
    <div class="inner" style="background:red"></div>
    <div class="inner" style="background:green"></div>
    <div class="inner" style="background:blue"></div>
    <div class="inner" style="background:yellow"></div>
    <div class="inner" style="background:orange"></div>
  </div>
</div>
<button class="righty paddle" id="right-button"></button>

我遇到的唯一问题是您可以滚动到最终的 div 颜色块之外。是否有可能让您无法滚动超过第一个和最后一个 div？

CodePen https://codepen.io/laurentkosc1990/pen/eYNXaxG

标签： javascripthtmlcss

Answer 1

也许这对你有用

const container = document.querySelector(".container");
const visibleWidth = container.offsetWidth; // visible width of container
const fullWidth = container.scrollWidth; //width of container incliding hidden part
const innerDivWidth = document.querySelector(".inner").offsetWidth+20;// margin 10px from both sides

const lefty = document.querySelector(".lefty");
let translate = 0;

lefty.addEventListener("click", function() {

  if(translate<0){
    translate += innerDivWidth;
    container.style.transform = "translateX(" + translate + "px" + ")";
  }

});

const righty = document.querySelector(".righty");
righty.addEventListener("click", function() {
  
  //here is my calculation, look carefully, you will get it

 if((translate + fullWidth) > visibleWidth){
   translate -= innerDivWidth;
   container.style.transform = "translateX(" + translate + "px" + ")";
  }

});

// btw translation rate should be according to inner div's width 
// otherwise last div will not show properly 

.outer {
  overflow-x: hidden;
  overflow-y: hidden;
}

.container {
  display: flex;
  transition: transform .4s ease-in;
}

.inner {
  flex: 0 0 25%;
  height: 100px;
  margin: 10px;
}

.paddle {
  position: absolute;
  top: 50px;
  bottom: 0;
  width: 30px;
  height: 20px;
}

.lefty {
  left: 0;
  z-index: 1;
}

.righty {
  right: 0;
  z-index: 1;
}

<button class="lefty paddle" id="left-button"></button>
<div class="outer" id="content">
  <div class="container">
    <div class="inner" style="background:red"></div>
    <div class="inner" style="background:green"></div>
    <div class="inner" style="background:blue"></div>
    <div class="inner" style="background:yellow"></div>
    <div class="inner" style="background:orange"></div>
  </div>
</div>
<button class="righty paddle" id="right-button"></button>