如何使用javascript获取h1标记的高度?
我想创造这种效果: 它位于加速自行车共享区下。我做了一个布局的大纲,但在样式上有问题,也不知道如何创建左侧的计数器。我假设我需要得到每个h1的高度,然后将其向下移动该高度 以下是html:如何使用javascript获取h1标记的高度?,javascript,html,css,Javascript,Html,Css,我想创造这种效果: 它位于加速自行车共享区下。我做了一个布局的大纲,但在样式上有问题,也不知道如何创建左侧的计数器。我假设我需要得到每个h1的高度,然后将其向下移动该高度 以下是html: <div class="why-us__carousel"> <div class="carousel__count"> <h1 class="count__zero">0</h1>
<div class="why-us__carousel">
<div class="carousel__count">
<h1 class="count__zero">0</h1>
<div class="count__num-item-holder">
<h1 class="count-num-item">1</h1>
<h1 class="count-num-item">2</h1>
<h1 class="count-num-item">3</h1>
<h1 class="count-num-item">4</h1>
<h1 class="count-num-item">5</h1>
<h1 class="count-num-item">6</h1>
<h1 class="count-num-item">7</h1>
<h1 class="count-num-item">8</h1>
<h1 class="count-num-item">9</h1>
</div>
</div>
<div class="carousel__item">
<div class="item__navigation">
<a id="arrow-left" class="arrow">
<svg width="48px" height="48px" viewBox="0 0 48 48" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g id="Page-1" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
<g id="Desktop-HD-Copy-7" transform="translate(-854.000000, -2100.000000)" fill-rule="nonzero">
<g id="Group-3" transform="translate(855.000000, 2101.000000)">
<polyline id="Path" stroke="#979797" points="25.3616433 28.4003541 20 23.0387108 25.3616433 17"></polyline>
<circle id="Oval" stroke="#FFFFFF" cx="23" cy="23" r="23"></circle>
</g>
</g>
</g>
</svg>
</a>
<a id="arrow-right" class="arrow">
<?xml version="1.0" encoding="UTF-8"?>
<svg width="48px" height="48px" viewBox="0 0 48 48" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<!-- Generator: Sketch 51.3 (57544) - http://www.bohemiancoding.com/sketch -->
<g id="Page-1" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
<g id="Desktop-HD-Copy-7" transform="translate(-854.000000, -2100.000000)" fill-rule="nonzero">
<g id="Group-3" transform="translate(878.000000, 2124.000000) rotate(-180.000000) translate(-878.000000, -2124.000000) translate(855.000000, 2101.000000)">
<polyline id="Path" stroke="#979797" points="25.3616433 28.4003541 20 23.0387108 25.3616433 17"></polyline>
<circle id="Oval" stroke="#FFFFFF" cx="23" cy="23" r="23"></circle>
</g>
</g>
</g>
</svg>
</a>
</div>
<p class="item__count">01</p>
<h1 class="item__title"></h1>
<h1 class="item__description"></h1>
</div>
</div>
.why-us{
@include element("carousel"){
width: 80%;
// height: 200px;
margin: 0 auto;
position: relative;
border: 1px solid green;
}
.carousel__count{
position: absolute;
left: 0%;
top: 45%;
// transform: translateY(-20%);
display: flex;
border: 1px solid red;
.count__zero, .count-num-item{
font-size: 250px;
line-height: 0;
}
.count-num-item{
&:not(:first-child){
transform: translateY(200px);
}
}
}
.carousel__item{
position: relative;
left: 425px;
width: 400px;
height: 400px;
border: 1px solid blue;
}
.item__navigation{
position: absolute;
left: 50%;
transform: translateX(-50%);
top: -70px;
display: flex;
width: 50%;
justify-content: space-evenly;
.arrow{
cursor: pointer;
}
}
}
class WhyUs {
constructor() {
//global variables
this.arrowRight = document.querySelector('#arrow-right');
this.arrowLeft = document.querySelector('#arrow-left');
this.h1Test = document.querySelectorAll('.count-num-item')[0];
console.log(this.h1Test.offsetHeight);// this isn't working.
//method calls
this.events();
}
events(){
this.arrowRight.addEventListener('click', this.next.bind(this));
this.arrowLeft.addEventListener('click', this.previous.bind(this));
}
previous(){
alert('previous');
}
next(){
alert('next');
}
}
export default WhyUs;
下面是javascript:
<div class="why-us__carousel">
<div class="carousel__count">
<h1 class="count__zero">0</h1>
<div class="count__num-item-holder">
<h1 class="count-num-item">1</h1>
<h1 class="count-num-item">2</h1>
<h1 class="count-num-item">3</h1>
<h1 class="count-num-item">4</h1>
<h1 class="count-num-item">5</h1>
<h1 class="count-num-item">6</h1>
<h1 class="count-num-item">7</h1>
<h1 class="count-num-item">8</h1>
<h1 class="count-num-item">9</h1>
</div>
</div>
<div class="carousel__item">
<div class="item__navigation">
<a id="arrow-left" class="arrow">
<svg width="48px" height="48px" viewBox="0 0 48 48" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g id="Page-1" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
<g id="Desktop-HD-Copy-7" transform="translate(-854.000000, -2100.000000)" fill-rule="nonzero">
<g id="Group-3" transform="translate(855.000000, 2101.000000)">
<polyline id="Path" stroke="#979797" points="25.3616433 28.4003541 20 23.0387108 25.3616433 17"></polyline>
<circle id="Oval" stroke="#FFFFFF" cx="23" cy="23" r="23"></circle>
</g>
</g>
</g>
</svg>
</a>
<a id="arrow-right" class="arrow">
<?xml version="1.0" encoding="UTF-8"?>
<svg width="48px" height="48px" viewBox="0 0 48 48" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<!-- Generator: Sketch 51.3 (57544) - http://www.bohemiancoding.com/sketch -->
<g id="Page-1" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
<g id="Desktop-HD-Copy-7" transform="translate(-854.000000, -2100.000000)" fill-rule="nonzero">
<g id="Group-3" transform="translate(878.000000, 2124.000000) rotate(-180.000000) translate(-878.000000, -2124.000000) translate(855.000000, 2101.000000)">
<polyline id="Path" stroke="#979797" points="25.3616433 28.4003541 20 23.0387108 25.3616433 17"></polyline>
<circle id="Oval" stroke="#FFFFFF" cx="23" cy="23" r="23"></circle>
</g>
</g>
</g>
</svg>
</a>
</div>
<p class="item__count">01</p>
<h1 class="item__title"></h1>
<h1 class="item__description"></h1>
</div>
</div>
.why-us{
@include element("carousel"){
width: 80%;
// height: 200px;
margin: 0 auto;
position: relative;
border: 1px solid green;
}
.carousel__count{
position: absolute;
left: 0%;
top: 45%;
// transform: translateY(-20%);
display: flex;
border: 1px solid red;
.count__zero, .count-num-item{
font-size: 250px;
line-height: 0;
}
.count-num-item{
&:not(:first-child){
transform: translateY(200px);
}
}
}
.carousel__item{
position: relative;
left: 425px;
width: 400px;
height: 400px;
border: 1px solid blue;
}
.item__navigation{
position: absolute;
left: 50%;
transform: translateX(-50%);
top: -70px;
display: flex;
width: 50%;
justify-content: space-evenly;
.arrow{
cursor: pointer;
}
}
}
class WhyUs {
constructor() {
//global variables
this.arrowRight = document.querySelector('#arrow-right');
this.arrowLeft = document.querySelector('#arrow-left');
this.h1Test = document.querySelectorAll('.count-num-item')[0];
console.log(this.h1Test.offsetHeight);// this isn't working.
//method calls
this.events();
}
events(){
this.arrowRight.addEventListener('click', this.next.bind(this));
this.arrowLeft.addEventListener('click', this.previous.bind(this));
}
previous(){
alert('previous');
}
next(){
alert('next');
}
}
export default WhyUs;
每个h1标签的高度不起作用,如何解决这个问题,或者是否有其他方法?另外,clientHeight给了我一个0
另外:getBoundingClientRect()还提供高度值0
谢谢。您应该为此使用clientHeight attr:
this.h1Test.clientHeight
您应该为此使用clientHeight attr:
this.h1Test.clientHeight
使用
getBoundingClientRect()
:
返回的值是一个DOMRect对象,它是getClientRects()为元素返回的矩形的并集,即与元素关联的CSS边框框。结果是包含整个元素的最小矩形,具有只读的left、top、right、bottom、x、y、width和height属性,以像素为单位描述整个边框框。宽度和高度以外的特性相对于视口的左上角
就你而言:
this.h1Test = document.querySelectorAll('.count-num-item')[0];
var height = this.h1Test.getBoundingClientRect().height;
要包含上下页边距,请使用:
var h1Margins = parseInt(elm.currentStyle.marginTop, 10) + parseInt(elm.currentStyle.marginBottom, 10);
var heightWithMargins = height + h1Margins;
在尝试计算h1
标记的高度时,您现在得到0的原因是CSS将.count num项
选择器设置为行高
为0
:
const boundingRect=document.getElementById('test-h1').getBoundingClientRect()
document.getElementById('bounding-rect')。textContent=JSON.stringify(boundingRect,null,2)
h1{
线高:0;
}
线条高度0,报告的高度0:
使用getBoundingClientRect()
:
返回的值是一个DOMRect对象,它是getClientRects()为元素返回的矩形的并集,即与元素关联的CSS边框框。结果是包含整个元素的最小矩形,具有只读的left、top、right、bottom、x、y、width和height属性,以像素为单位描述整个边框框。宽度和高度以外的特性相对于视口的左上角
就你而言:
this.h1Test = document.querySelectorAll('.count-num-item')[0];
var height = this.h1Test.getBoundingClientRect().height;
要包含上下页边距,请使用:
var h1Margins = parseInt(elm.currentStyle.marginTop, 10) + parseInt(elm.currentStyle.marginBottom, 10);
var heightWithMargins = height + h1Margins;
在尝试计算h1
标记的高度时,您现在得到0的原因是CSS将.count num项
选择器设置为行高
为0
:
const boundingRect=document.getElementById('test-h1').getBoundingClientRect()
document.getElementById('bounding-rect')。textContent=JSON.stringify(boundingRect,null,2)
h1{
线高:0;
}
线条高度0,报告的高度0:
代码在中工作
代码在中工作
你好,给我0。。。不value@junior_coder真奇怪。您介意在JSFIDLE中创建一个示例来说明这个问题吗?您好,给我0。。。不value@junior_coder真奇怪。您介意在JSFIDLE中创建一个示例来说明这个问题吗height@junior_coder我注意到您的页面有许多
元素,因此您确定h1Test
是正确的
元素吗?如果DOM API说它的高度是0
,那么它在屏幕上是不可见的(即,它通过display:none
隐藏)。使用浏览器的F12开发者工具确保您选择了正确的元素。只需尝试使用任何h1来获得高度-在本例中,我使用的第一个h1来查看高度是多少!它现在可以工作了-问题是线条高度:0。所以现在我基本上只是通过高度值来设置动画,对吗?给出0作为height@junior_coder我注意到您的页面有许多
元素,因此您确定h1Test
是正确的
元素吗?如果DOM API说它的高度是0
,那么它在屏幕上是不可见的(即,它通过display:none
隐藏)。使用浏览器的F12开发者工具确保您选择了正确的元素。只需尝试使用任何h1来获得高度-在本例中,我使用的第一个h1来查看高度是多少!它现在可以工作了-问题是线条高度:0。所以现在我基本上只是通过高度值来设置动画,对吗?可能的复制,可能的复制