javascript - offsetHeight、clientHeight 和 scrollHeight 没有给出正确的高度
问题描述
我读过offsetHeight、clientHeight和scrollHeight。我仍然无法弄清楚如何将正确的高度设置为可以包括的 div:
- 盒子尺寸
- 填充
- 利润
- 边界
- 其他可能推动 div 的东西
在下面的示例中,我制作了 4 个部分。第一部分未触及,因此该部分的高度是自动且正确的。当我尝试使用 offsetHeight、clientHeight 和 scrollHeight 设置其他部分的高度时,结果不再正确。
如何以始终有效的方式计算它?我在 Stackoverflow 上看到了很多答案,但没有可靠的解决方案。
window.addEventListener('DOMContentLoaded', (event) => {
let items1 = document.querySelectorAll('.section1 div');
let items2 = document.querySelectorAll('.section2 div');
let items3 = document.querySelectorAll('.section3 div');
items1.forEach((item) => {
item.style.height = item.offsetHeight + 'px';
});
items2.forEach((item) => {
item.style.height = item.clientHeight + 'px';
});
items3.forEach((item) => {
item.style.height = item.scrollHeight + 'px';
});
});
.div1 {
border: 5px solid #fff;
padding: .5rem;
margin: .5rem;
box-sizing: border-box;
}
.div2 {
border: 5px solid #fff;
padding: .5rem;
margin: .5rem;
}
.div3 {
padding: .5rem;
margin: .5rem;
box-sizing: border-box;
}
.div4 {
padding: .5rem;
margin: .5rem;
}
.div5 {
}
div[class^=div] {
background: #eee;
outline: 1px solid red;
}
body {
display: flex;
}
section {
background: #f5f5f5;
margin: .5rem;
width: 100px;
}
<section class="correct">
<div class="div1">Some<br>text</div>
<div class="div2">Some<br>text</div>
<div class="div3">Some<br>text</div>
<div class="div4">Some<br>text</div>
<div class="div5">Some<br>text</div>
</section>
<section class="section1">
<div class="div1">Some<br>text</div>
<div class="div2">Too<br>High</div>
<div class="div3">Some<br>text</div>
<div class="div4">Too<br>high</div>
<div class="div5">Some<br>text</div>
</section>
<section class="section2">
<div class="div1">Too<br>low</div>
<div class="div2">Too<br>high</div>
<div class="div3">Some<br>text</div>
<div class="div4">Too<br>high</div>
<div class="div5">Some<br>text</div>
</section>
<section class="section3">
<div class="div1">Too<br>low</div>
<div class="div2">Too<br>high</div>
<div class="div3">Some<br>text</div>
<div class="div4">Too<br>high</div>
<div class="div5">Some<br>text</div>
</section>
解决方案
问题是您随机应用box-sizing
. 您应该将它们应用于同一部分中的所有元素,或者根本不应用它们,但不能只应用于其中的几个元素。
正确的结果是第一个box-sizing:border-box
应用的结果。
window.addEventListener('DOMContentLoaded', (event) => {
let items1 = document.querySelectorAll('.section1 div');
let items2 = document.querySelectorAll('.section2 div');
let items3 = document.querySelectorAll('.section3 div');
items1.forEach((item) => {
item.style.height = item.offsetHeight + 'px';
});
items2.forEach((item) => {
item.style.height = item.clientHeight + 'px';
});
items3.forEach((item) => {
item.style.height = item.scrollHeight + 'px';
});
});
.div1 {
border: 5px solid #fff;
padding: .5rem;
margin: .5rem;
}
.div2 {
border: 5px solid #fff;
padding: .5rem;
margin: .5rem;
}
.div3 {
padding: .5rem;
margin: .5rem;
}
.div4 {
padding: .5rem;
margin: .5rem;
}
div[class^=div] {
background: #eee;
outline: 1px solid red;
}
body {
display: flex;
}
section {
background: #f5f5f5;
margin: .5rem;
width: 100px;
}
.section1 >*{
box-sizing: border-box;
}
<section class="correct">
<div class="div1">Some<br>text</div>
<div class="div2">Some<br>text</div>
<div class="div3">Some<br>text</div>
<div class="div4">Some<br>text</div>
<div class="div5">Some<br>text</div>
</section>
<section class="section1">
<div class="div1">Some<br>text</div>
<div class="div2">Too<br>High</div>
<div class="div3">Some<br>text</div>
<div class="div4">Too<br>high</div>
<div class="div5">Some<br>text</div>
</section>
<section class="section2">
<div class="div1">Too<br>low</div>
<div class="div2">Too<br>high</div>
<div class="div3">Some<br>text</div>
<div class="div4">Too<br>high</div>
<div class="div5">Some<br>text</div>
</section>
<section class="section3">
<div class="div1">Too<br>low</div>
<div class="div2">Too<br>high</div>
<div class="div3">Some<br>text</div>
<div class="div4">Too<br>high</div>
<div class="div5">Some<br>text</div>
</section>
添加box-sizing
到另一个将使它们更小,因为两者都不在计算中包括边界,并且给定的值稍后将包括边界。
window.addEventListener('DOMContentLoaded', (event) => {
let items1 = document.querySelectorAll('.section1 div');
let items2 = document.querySelectorAll('.section2 div');
let items3 = document.querySelectorAll('.section3 div');
items1.forEach((item) => {
item.style.height = item.offsetHeight + 'px';
});
items2.forEach((item) => {
item.style.height = item.clientHeight + 'px';
});
items3.forEach((item) => {
item.style.height = item.scrollHeight + 'px';
});
});
.div1 {
border: 5px solid #fff;
padding: .5rem;
margin: .5rem;
}
.div2 {
border: 5px solid #fff;
padding: .5rem;
margin: .5rem;
}
.div3 {
padding: .5rem;
margin: .5rem;
}
.div4 {
padding: .5rem;
margin: .5rem;
}
div[class^=div] {
background: #eee;
outline: 1px solid red;
}
body {
display: flex;
}
section {
background: #f5f5f5;
margin: .5rem;
width: 100px;
}
.section1 >*,
.section2 >*,
.section3 >*{
box-sizing: border-box;
}
<section class="correct">
<div class="div1">Some<br>text</div>
<div class="div2">Some<br>text</div>
<div class="div3">Some<br>text</div>
<div class="div4">Some<br>text</div>
<div class="div5">Some<br>text</div>
</section>
<section class="section1">
<div class="div1">Some<br>text</div>
<div class="div2">Too<br>High</div>
<div class="div3">Some<br>text</div>
<div class="div4">Too<br>high</div>
<div class="div5">Some<br>text</div>
</section>
<section class="section2">
<div class="div1">Too<br>low</div>
<div class="div2">Too<br>high</div>
<div class="div3">Some<br>text</div>
<div class="div4">Too<br>high</div>
<div class="div5">Some<br>text</div>
</section>
<section class="section3">
<div class="div1">Too<br>low</div>
<div class="div2">Too<br>high</div>
<div class="div3">Some<br>text</div>
<div class="div4">Too<br>high</div>
<div class="div5">Some<br>text</div>
</section>
请注意,scrollHeight
这里clientHeight
是相同的,因为没有溢出。
通常,
offsetHeight
是元素 CSS 高度的像素度量,包括任何边框、填充和水平滚动条(如果呈现)。参考该
scrollHeight
值等于元素需要的最小高度,以便在不使用垂直滚动条的情况下适应视口中的所有内容。高度的测量方式与clientHeight
: 它包括元素的填充,但不包括其边框、边距或水平滚动条(如果存在)。它还可以包括伪元素的高度,例如 ::before 或 ::after。如果元素的内容不需要垂直滚动条就可以适应,则它scrollHeight
等于clientHeight
ref
更新
如果你想要一个通用的方法,那么你需要测试box-sizing
. 如果border-box
您考虑offsetHeight
,如果不考虑,则考虑clientHeight
减去填充:
window.addEventListener('DOMContentLoaded', (event) => {
let items = document.querySelectorAll('section:not(.correct) div');
items.forEach((item) => {
var e = window.getComputedStyle(item);
var b = e.boxSizing;
if(b =="border-box")
item.style.height = item.offsetHeight + 'px';
else
var p = parseFloat(e.paddingTop) + parseFloat(e.paddingBottom);
item.style.height = (item.clientHeight - p) + 'px';
});
});
.div1 {
border: 5px solid #fff;
padding: .5rem;
margin: .5rem;
box-sizing: border-box;
}
.div2 {
border: 5px solid #fff;
padding: .5rem;
margin: .5rem;
}
.div3 {
padding: .5rem;
margin: .5rem;
box-sizing: border-box;
}
.div4 {
padding: .5rem;
margin: .5rem;
}
.div5 {
}
div[class^=div] {
background: #eee;
outline: 1px solid red;
}
body {
display: flex;
}
section {
background: #f5f5f5;
margin: .5rem;
width: 100px;
}
<section class="correct">
<div class="div1">Some<br>text</div>
<div class="div2">Some<br>text</div>
<div class="div3">Some<br>text</div>
<div class="div4">Some<br>text</div>
<div class="div5">Some<br>text</div>
</section>
<section class="section1">
<div class="div1">Some<br>text</div>
<div class="div2">Too<br>High</div>
<div class="div3">Some<br>text</div>
<div class="div4">Too<br>high</div>
<div class="div5">Some<br>text</div>
</section>
<section class="section2">
<div class="div1">Too<br>low</div>
<div class="div2">Too<br>high</div>
<div class="div3">Some<br>text</div>
<div class="div4">Too<br>high</div>
<div class="div5">Some<br>text</div>
</section>
<section class="section3">
<div class="div1">Too<br>low</div>
<div class="div2">Too<br>high</div>
<div class="div3">Some<br>text</div>
<div class="div4">Too<br>high</div>
<div class="div5">Some<br>text</div>
</section>
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