我正在尝试使用 Bootstrap 4 将我的容器居中放置在页面中间.到目前为止我没有成功.任何帮助将不胜感激.
我在
由于 Bootstrap 4 .row 现在是 display:flex，您可以简单地在任何列上使用 align-self-center 使其垂直居中...
<div class="col-6 align-self-center"><div class="card card-block">中心<div class="col-6"><div class="card card-inverse card-danger">更高
或者，在整个 .row 上使用 align-items-center 垂直居中对齐行中的所有 col-*...
<div class="col-6"><div class="card card-block">中心<div class="col-6"><div class="card card-inverse card-danger">更高
3 - 使用 Display Utils 的垂直居中:
Bootstrap 4 具有可用于 的显示工具display:table、display:table-cell、display:inline 等.这些可以与 垂直对齐工具用于对齐内联、内联块或表格单元格元素.
<div class="col-sm-12 h-100 d-table"><div class="card card-block d-table-cell align-middle">我垂直居中重要！ 我提到身高了吗?
记住垂直居中是相对于父元素的高度的.如果你想以整个页面为中心，在大多数情况下，这应该是你的 CSS...
body,html {高度:100%；}或者在父/容器上使用 min-height: 100vh(min-vh-100 在 Bootstrap 4.1+ 中).如果要将子元素居中放置在父元素中.父级必须具有定义的高度.
另见:
引导程序 4 中的垂直对齐
Bootstrap 中心垂直和水平对齐
I am trying to center my Container in the middle of the page using Bootstrap 4. I have been unsuccessful thus far. Any help would be appreciated.
I have built it at Codepen.io so you guys can play with it and let me know what works as I am about out of ideas...
var currentAuthor = "";
var currentQuote = "";
function randomQuote() {
$.ajax({
url: "https://api.forismatic.com/api/1.0/?",
dataType: "jsonp",
data: "method=getQuote&format=jsonp&lang=en&jsonp=?",
success: function( response ) {
$("#quote-content").html('<h2 id="quote-content" class="display-5"><i class="fa fa-quote-left" aria-hidden="true"> ' + response.quoteText + ' <i class="fa fa-quote-right" aria-hidden="true"></i></h2>');
$("#quote-author").html('<p id="quote-author" class="lead"><em>' + response.quoteAuthor + '</em></p>');
currentAuthor = response.quoteAuthor;
currentQuote = response.quoteText
}
});
}
function openURL(url){
window.open(url,'Share', 'width=550, height=400, toolbar=0, scrollbars=1 ,location=0 ,statusbar=0,menubar=0, resizable=0');
}
function tweetQuote(){
openURL('https://twitter.com/intent/tweet?hashtags=quotes,freecodecamp&related=freecodecamp&text=' + encodeURIComponent('"' + currentQuote + '" - ' + currentAuthor));
}
$(document).ready(function () {
randomQuote();
$("#get-another-quote-button").click(function(){
randomQuote();
});
$('#tweet').on('click', function() {
tweetQuote();
});
});
html, body {
background-image: url("https://www.mylinea.com/wp-content/uploads/beautiful-trees-stock-photo-055.jpg");
background-color: #17234E;
margin-bottom: 0;
min-height: 30%;
background-repeat: no-repeat;
background-position: center;
-webkit-background-size: cover;
background-size: cover;
}
.btn-new-quote {
color: #0C0C0D;
background-color: transparent;
border-color: #414147;
}
.btn-new-quote:hover {
color: #0C0C0D;
background-color: #9A989E;
border-color: #0C0C0D;
}
#tweet {
color: RGB(100, 100, 100);
}
#tweet:hover {
color: RGB(50, 50, 50);
}
.jumbotron {
position: relative;
top: 50%;
transform: translateY(-50%);
opacity: .85;
border-color: RGB(50, 50, 50);
padding-bottom: 8px;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.0.0-alpha.6/css/bootstrap.min.css">
<div class="container">
<div class="row justify-content-center align-self-center">
<div class="col-sm-6">
<div class="jumbotron vertical-center text-center">
<h2 id="quote-content" class="display-5"><i class="fa fa-quote-left" aria-hidden="true"></i><i class="fa fa-quote-right" aria-hidden="true"></i></h2>
<p id="quote-author" class="lead"><em></em></p>
<hr class="my-2">
<div class="row align-items-center justify-content-between">
<div class="col-sm-1-4 text-left">
<a id="tweet" href="#">
<h2 class="display-4"><i class="fa fa-twitter" aria-hidden="true"></i></h2>
</a>
</div>
<div class="col-sm-1-4 text-right">
<button id="get-another-quote-button" type="button" class="btn btn-outline-secondary btn-new-quote">Don't Quote Me on This...</button>
</div>
</div>
</div>
</div>
</div>
</div>
Important! Vertical center is relative to the height of the parent
If the parent of the element you're trying to center has no defined height, none of the vertical centering solutions will work!
Now, onto vertical centering...
Bootstrap 5 (Updated 2021)
Bootstrap 5 is still flexbox based so vertical centering works the same way as Bootstrap 4. For example, align-items-center, justify-content-center or auto margins can used on the flexbox parent (row or d-flex).
align-items-center on a flexbox row parent (row or d-flex)justify-content-center on a flexbox column parent (d-flex flex-column)my-auto on a flexbox parentVertical Center in Bootstrap 5
Bootstrap 4
You can use the new flexbox & size utilities to make the container full-height and display: flex. These options don't require extra CSS (except that the height of the container (ie:html,body) must be 100%).
Option 1 align-self-center on flexbox child
<div class="container d-flex h-100">
<div class="row justify-content-center align-self-center">
I'm vertically centered
</div>
</div>
https://codeply.com/go/fFqaDe5Oey
Option 2 align-items-center on flexbox parent (.row is display:flex; flex-direction:row)
<div class="container h-100">
<div class="row align-items-center h-100">
<div class="col-6 mx-auto">
<div class="jumbotron">
I'm vertically centered
</div>
</div>
</div>
</div>
https://codeply.com/go/BumdFnmLuk
Option 3 justify-content-center on flexbox parent (.card is display:flex;flex-direction:column)
<div class="container h-100">
<div class="row align-items-center h-100">
<div class="col-6 mx-auto">
<div class="card h-100 border-primary justify-content-center">
<div>
...card content...
</div>
</div>
</div>
</div>
</div>
https://codeply.com/go/3gySSEe7nd
More on Bootstrap 4 Vertical Centering
Now that Bootstrap 4 offers flexbox and other utilities, there are many approaches to vertical alignment. http://www.codeply.com/go/WG15ZWC4lf
1 - Vertical Center Using Auto Margins:
Another way to vertically center is to use my-auto. This will center the element within it's container. For example, h-100 makes the row full height, and my-auto will vertically center the col-sm-12 column.
<div class="row h-100">
<div class="col-sm-12 my-auto">
<div class="card card-block w-25">Card</div>
</div>
</div>
Vertical Center Using Auto Margins Demo
my-auto represents margins on the vertical y-axis and is equivalent to:
margin-top: auto;
margin-bottom: auto;
2 - Vertical Center with Flexbox:
Since Bootstrap 4 .row is now display:flex you can simply use align-self-center on any column to vertically center it...
<div class="row">
<div class="col-6 align-self-center">
<div class="card card-block">
Center
</div>
</div>
<div class="col-6">
<div class="card card-inverse card-danger">
Taller
</div>
</div>
</div>
or, use align-items-center on the entire .row to vertically center align all col-* in the row...
<div class="row align-items-center">
<div class="col-6">
<div class="card card-block">
Center
</div>
</div>
<div class="col-6">
<div class="card card-inverse card-danger">
Taller
</div>
</div>
</div>
Vertical Center Different Height Columns Demo
See this Q/A to center, but maintain equal height
3 - Vertical Center Using Display Utils:
Bootstrap 4 has display utils that can be used for display:table, display:table-cell, display:inline, etc.. These can be used with the vertical alignment utils to align inline, inline-block or table cell elements.
<div class="row h-50">
<div class="col-sm-12 h-100 d-table">
<div class="card card-block d-table-cell align-middle">
I am centered vertically
</div>
</div>
</div>
Vertical Center Using Display Utils Demo
More examples
Vertical center image in <div>
Vertical center .row in .container
Vertical center and bottom in <div>
Vertical center child inside parent
Vertical center full screen jumbotron
Important! Did I mention height?
Remember vertical centering is relative to the height of the parent element. If you want to center on the entire page, in most cases, this should be your CSS...
body,html {
height: 100%;
}
Or use min-height: 100vh (min-vh-100 in Bootstrap 4.1+) on the parent/container. If you want to center a child element inside the parent. The parent must have a defined height.
Also see:
Vertical alignment in bootstrap 4
Bootstrap Center Vertical and Horizontal Alignment
这篇关于Bootstrap 中的垂直对齐中心的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
