Two column layout_html/css_WEB-ITnose
Jun 24, 2016 am 11:54 AM
1. Common two-column layout
For example, Baidu search results page has two columns with fixed width and adaptive height.
The blog park article content page has a similar structure to the above.
2. Steps to implement two-column layout
1) Apply floating
CSS as follows
*{margin:0;padding:0;}#header,#footer{width:960px; height:40px; background-color:#f0f0f0; margin:0 auto;}#drapper{ width:960px; margin:10px auto;} .mainBox{float:left; width:680px; background-color:red;}.sidebar{float:right; width:270px;background-color:red;} Our html structure Generally it is like this
<div id="header">header</div><div id="drapper"><div class="mainBox">下午在創(chuàng)新工場聽賴曉寧的分享，他說到 O2O 這個領(lǐng)域，如果你只是做簡單的線上引流到線下，是沒有多少機會的，能賺個 1、2 年錢不錯了。真正重要的，是完全拆解掉線下的利益鏈條，按你的邏輯重新組裝起來，這樣才有壁壘。</div><div class="sidebar">想革傳統(tǒng)行業(yè)的命？你得先拆解開原有鏈條，再重構(gòu)新格局</div><div style="clear:both;"></div></div><div id="footer">footer</div>
Now the height of the floating div in the style is not set, and the height of the left floating div is set to After 50pxj, what will happen if the content exceeds the height?
Therefore, it is best not to fix the height of the floating div, or after fixing the height, add overflow: hidden;
2) Height adaptive
Height adaptive means not setting the height, or height:auto;
3) Clear floating
Baidu search or blog garden content pages add an extra div tag after the floating div. Generally clear floats can be handled.
Someone said, isn’t it also possible to just add clear:both; to the footer?
If you look carefully, there is still a difference. Only a float is added to the footer, and the margins set by the div container dragper do not work.
3. One column has a fixed width and one column is adaptive
A fixed column must use a fixed width of px. If it is adaptive, use % to control the width, such as sidebar 200px, mainBox70%, but if the browser When the visible area is reduced, the sidebar is squeezed to the bottom again. It is best to use width:auto or 100% with negative margin. At this time, there is also a problem when the window is reduced and the sidebar content and mainBox content overlap. At this time, positioning can be used to solve this problem. The modified css is as follows
*{margin:0;padding:0;}#header,#footer{width:auto; height:40px; background-color:#f0f0f0; margin:0 auto;}#drapper{ width:auto; margin:10px auto; position:relative;}.mainBox{float:left; width:auto; background-color:red; margin-right:275px;}.sidebar{float:right; width:270px;background-color:red; position:absolute;top:0px;right:0px;}
The display effect after the visual window changes
4. Two-column width adaptive
In this layout method, you can directly assign a certain width ratio to the floating div, such as mainBox 70% and sidebar 28%. As the window changes, the two columns are always displayed proportionally, without overlapping or one column being "squeezed below".
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