This time I will show you how to set the horizontal and vertical centering of html elements. What are the precautions for setting the horizontal and vertical centering of html elements. The following is a practical case, let's take a look.
When we design the page, we often need to center the DIV, and display it horizontally and vertically relative to the page window, such as centering the login window.
So far, many methods have been explored.
HTML:
<body> <div class="maxbox"> <div class="minbox align-center"></div> </div> </body>
The first type: CSSAbsolute positioning
Mainly use absolute positioning, and then use margin to adjust to the middle position.
Parent element:
.maxbox{ position: relative; width: 500px; height: 500px; margin: 5px; box-shadow: 1px 1px 1px rgba(0, 0, 0, 0.8), -1px -1px 1px rgba(0, 0, 0, 0.8); }
Child element:
.minbox{ width: 200px; height: 200px; box-shadow: 1px 1px 1px rgba(0, 0, 0, 0.8), -1px -1px 1px rgba(0, 0, 0, 0.8); }
Horizontal and vertical center alignment:
.align-center{ position: absolute; left: 50%; top: 50%; margin-left: -100px; /*width/-2*/ margin-top: -100px; /*height/-2*/ }
Second type: CSS absolute positioning + Javascript /JQuery
Mainly use absolute positioning, and then use Javascript/JQuery to adjust to the middle position. Compared with the first method, this method improves the flexibility of the class.
Parent element:
.maxbox{ position: relative; width: 500px; height: 500px; margin: 5px; box-shadow: 1px 1px 1px rgba(0, 0, 0, 0.8), -1px -1px 1px rgba(0, 0, 0, 0.8); }
Child element:
.minbox{ width: 200px; height: 200px; box-shadow: 1px 1px 1px rgba(0, 0, 0, 0.8), -1px -1px 1px rgba(0, 0, 0, 0.8); }
Horizontal and vertical center alignment:
.align-center{ position: absolute; left: 50%; top: 50%; }
JQuery:
$(function(){ $(".align-center").css( { "margin-left": ($(".align-center").width()/-2), "margin-top": ($(".align-center").height()/-2) } ); });
Several methods Comparison:
The first CSS absolute positioning margin adjustment has good compatibility but lacks flexibility. If there are many boxes that need to be horizontally and vertically centered, they need to write different .align-center because of their different width and height.
The second one uses scripting language, which has good compatibility and makes up for the shortcomings of the first one. The effect of horizontal and vertical centering will not be affected by changes in width and height.
The third one uses some new properties of CSS3 and is compatible with IE10, Chrome, Firefox, and Opera. The compatibility is not very good, and the horizontal and vertical centering effect will not be affected by changes in width and height.
I believe you have mastered the methods after reading these cases. For more exciting information, please pay attention to other related articles on the php Chinese website!
Related reading:
How to use HTML and CSS to make Dabai
##What are the commonly used tags in XHTML
How to use the img image tag in HTML/XHTML
The above is the detailed content of How to set the horizontal and vertical centering of html elements. For more information, please follow other related articles on the PHP Chinese website!

本篇文章带大家了解一下HTML(超文本标记语言),介绍一下HTML的本质,HTML文档的结构、HTML文档的基本标签和图像标签、列表、表格标签、媒体元素、表单,希望对大家有所帮助!

不算。html是一种用来告知浏览器如何组织页面的标记语言,而CSS是一种用来表现HTML或XML等文件样式的样式设计语言;html和css不具备很强的逻辑性和流程控制功能,缺乏灵活性,且html和css不能按照人类的设计对一件工作进行重复的循环,直至得到让人类满意的答案。

总结了一些web前端面试(笔试)题分享给大家,本篇文章就先给大家分享HTML部分的笔试题(附答案),大家可以自己做做,看看能答对几个!

HTML5中画布标签是“<canvas>”。canvas标签用于图形的绘制,它只是一个矩形的图形容器,绘制图形必须通过脚本(通常是JavaScript)来完成;开发者可利用多种js方法来在canvas中绘制路径、盒、圆、字符以及添加图像等。

html5废弃了dir列表标签。dir标签被用来定义目录列表,一般和li标签配合使用,在dir标签对中通过li标签来设置列表项,语法“<dir><li>列表项值</li>...</dir>”。HTML5已经不支持dir,可使用ul标签取代。

在html中,document是文档对象的意思,代表浏览器窗口的文档;document对象是window对象的子对象,所以可通过“window.document”属性对其进行访问,每个载入浏览器的HTML文档都会成为Document对象。

html5支持boolean值属性;boolean值属性指是属性值为true或者false的属性,如input元素中的disabled属性,不使用该属性表示值为flase,不禁用元素,使用该属性可以不设置属性值表示值为true,禁用元素。


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