javascript - div 相对于另外两个 div 的位置

Question

我有一个由多个可以折叠的 div 组成的 div，然后在它们下面是另一个 div。

目前，如下面的 fiddle 所示，底部 div 仅在单击框 3 或框 1(左列)时向下滚动。

我希望右栏(方框 2 和 4)像左栏一样向下滚动，但到目前为止我失败了。

感谢您提前提供的帮助。

var drop = document.getElementsByClassName("drop");
var i;

for (i = 0; i < drop.length; i++) {
  drop[i].addEventListener("click", function() {
  this.classList.toggle("active");
  var collapse = this.previousElementSibling;
  if (collapse.style.maxHeight) {
    collapse.style.maxHeight = null;
    } else {
    collapse.style.maxHeight = collapse.scrollHeight + "px";
    }
  });
}

#panel	{
	background-color: white;
	float: center;
	position: relative;
	width: 800px;
	/* height: 500px; */
	margin: 0 auto;
	border-color: #B7B7B7;
	border-width: 2px;
	border-radius: 25px;
}

#box1	{
	border: 2px solid #B7B7B7;
  position: relative;
	display: inline-block;
	width: 250px;
	top: 0;
	left: 0;
	border-radius: 5px;
	transition: max-height 0.2s ease-out;
}

#box2	{
	border: 2px solid #B7B7B7;
	position: relative;
	display: inline-block;
	width: 525px;
	top: 0;
	float: right;
	border-radius: 5px;
	transition: max-height 0.2s ease-out;
}

#box3	{
	border: 2px solid #B7B7B7;
	display: inline-block;
	top: 0;
	left: 0;
	width: 250px;
	position: relative;
	border-radius: 5px;
	transition: max-height 0.2s ease-out;
}

#box4	{
	border: 2px solid #B7B7B7;
	display: inline-block;
	position: relative;
	top: 0;
	float: right;
	width: 525px;
	border-radius: 5px;
	transition: max-height 0.2s ease-out;
}

#travel	{
	margin: auto;
  background-color: black;
	border-style: solid;
	border-color: #B7B7B7;
	border-width: 2px;
	border-radius: 5px;
	position: relative;
	margin-top: 15px;
	width: 800px;
	height: 300px;
}

.drop {
  background-color: #eee;
  color: #444;
  cursor: pointer;
  padding: 18px;
  width: 100%;
  border: none;
  text-align: left;
  outline: none;
  font-size: 15px;
  border-radius: 5px;
  bottom: 0;
}

.active, .drop:hover {
  background-color: #ccc;
}

.collapse {
  padding: 0 18px;
  background-color: gray;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.2s ease-out;
}

<div id=panel>
	<div id="box1">
		<br>this is box 1<br>
		<div class="collapse">
			<p>a drop</p>
		</div>
		<button class="drop">view more</button>
	</div>
	<div id="box2" style="margin-bottom: 15px;">
		<br>this is box 2<br>
		<div class="collapse">
			<p>a drop</p>
		</div>
		<button class="drop">view more</button>
	</div>
	<div id="box4">
		<br>this is box 4<br>
		<div class="collapse">
			<p>a drop</p>
		</div>
		<button class="drop">view more</button>
	</div>
	<div id="box3" style="margin-top: 15px;">
		<br>this is box 3<br>
		<div class="collapse">
			<p>a drop</p>
		</div>
		<button class="drop">view more</button>
	</div>
	<div id="travel">
		
	</div>
</div>

Answer 1

当您使 box2 和 box4 float 在右侧时，您将需要在所有盒子后面添加一个清除元素来清除 float 对象的效果。我已添加<div style="clear:both"></div>后框:

var drop = document.getElementsByClassName("drop");
var i;

for (i = 0; i < drop.length; i++) {
  drop[i].addEventListener("click", function() {
  this.classList.toggle("active");
  var collapse = this.previousElementSibling;
  if (collapse.style.maxHeight) {
    collapse.style.maxHeight = null;
    } else {
    collapse.style.maxHeight = collapse.scrollHeight + "px";
    }
  });
}

#panel	{
	background-color: white;
	float: center;
	position: relative;
	width: 800px;
	/* height: 500px; */
	margin: 0 auto;
	border-color: #B7B7B7;
	border-width: 2px;
	border-radius: 25px;
}

#box1	{
	border: 2px solid #B7B7B7;
  position: relative;
	display: inline-block;
	width: 250px;
	top: 0;
	left: 0;
	border-radius: 5px;
	transition: max-height 0.2s ease-out;
}

#box2	{
	border: 2px solid #B7B7B7;
	position: relative;
	display: inline-block;
	width: 525px;
	top: 0;
	float: right;
	border-radius: 5px;
	transition: max-height 0.2s ease-out;
}

#box3	{
	border: 2px solid #B7B7B7;
	display: inline-block;
	top: 0;
	left: 0;
	width: 250px;
	position: relative;
	border-radius: 5px;
	transition: max-height 0.2s ease-out;
}

#box4	{
	border: 2px solid #B7B7B7;
	display: inline-block;
	position: relative;
	top: 0;
	float: right;
	width: 525px;
	border-radius: 5px;
	transition: max-height 0.2s ease-out;
}

#travel	{
	margin: auto;
  background-color: black;
	border-style: solid;
	border-color: #B7B7B7;
	border-width: 2px;
	border-radius: 5px;
	position: relative;
	margin-top: 15px;
	width: 800px;
	height: 300px;
}

.drop {
  background-color: #eee;
  color: #444;
  cursor: pointer;
  padding: 18px;
  width: 100%;
  border: none;
  text-align: left;
  outline: none;
  font-size: 15px;
  border-radius: 5px;
  bottom: 0;
}

.active, .drop:hover {
  background-color: #ccc;
}

.collapse {
  padding: 0 18px;
  background-color: gray;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.2s ease-out;
}

<div id=panel>
	<div id="box1">
		<br>this is box 1<br>
		<div class="collapse">
			<p>a drop</p>
		</div>
		<button class="drop">view more</button>
	</div>
	<div id="box2" style="margin-bottom: 15px;">
		<br>this is box 2<br>
		<div class="collapse">
			<p>a drop</p>
		</div>
		<button class="drop">view more</button>
	</div>
	<div id="box4">
		<br>this is box 4<br>
		<div class="collapse">
			<p>a drop</p>
		</div>
		<button class="drop">view more</button>
	</div>
	<div id="box3" style="margin-top: 15px;">
		<br>this is box 3<br>
		<div class="collapse">
			<p>a drop</p>
		</div>
		<button class="drop">view more</button>
	</div>
    <div style="clear:both"></div>
	<div id="travel">
		
	</div>
</div>