blocks|key|2718619|text|方法1:使用calc()属性将头和内容包装在一个div中的。|type|blockquote|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|2718620|​|unstyled|2718621|body,html{+margin:0px;+padding:0px;height:100%25}
.wrapper{height:calc(100%25+-+50px);}

footer{+height:50px;+background:red;}|code-block|syntax|javascript|2718622|<div+class="wrapper">
++<nav+id="primary"></nav>
++<nav+id="secondary"></nav>
++<section+id="maincontainer">
++++<div+id="main">...</div>
++</section>+
+</div>+
++++<footer>
+++++<div+class="footer-inner">Footer</div>
++++</footer>|2718623|2718624|方法2:通过使用页脚的-ve高度和包装器元素。|2718625|2718626|body,html{+margin:0px;+padding:0px;height:100%25}



.page-wrap+{
++min-height:+100%25;
++/*+equal+to+footer+height+*/
++margin-bottom:+-50px;+
}
.page-wrap:after+{
++content:+"";
++display:+block;
}
.site-footer,+.page-wrap:after+{
++height:+50px;+
}
.site-footer+{
++background:+red;
}|2718627|<div+class="page-wrap">
++<nav+id="primary"></nav>
++<nav+id="secondary"></nav>
++<section+id="maincontainer">
++++<div+id="main">...</div>
++</section>+
+</div>+
++++<footer+class="site-footer">
+++++<div+class="footer-inner">Footer</div>
++++</footer>|2718628|2718629|编辑|2718630|方法3:使用相同结构和calc()的。|2718631|2718632|body,
html+{
++margin:+0px;
++padding:+0px;
++height:+100%25
}

#primary+{
++height:+50px;
++background:+green;
++width:+100%25;
}

#secondary+{
++height:+50px;
++background:+yellow;
++width:+100%25;
}

#maincontainer+{
++width:+100%25;
++height:+calc(100%25+-+130px);
}

#main+{
++height:+100%25;
}

footer+{
++background:+red;
++height:+30px;
}|2718633|<nav+id="primary">Nav+1</nav>
++<nav+id="secondary">Nav+2</nav>
++<section+id="maincontainer">
++++<div+id="main">...</div>
++++<footer>
+++++<div+class="footer-inner">...</div>
++++</footer>
++</section>|2718634|2718635|entityMap^0|0|T|0|0|0|0|0|0|4|0|0|0|0|0|0|2|0|0|I|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1A|8|@$9|1B|A|1C|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|1D|8|@]|D|@]|E|$]]|$1|I|3|J|5|K|7|1E|8|@]|D|@]|E|$L|M]]|$1|N|3|O|5|K|7|1F|8|@]|D|@]|E|$L|M]]|$1|P|3|G|5|H|7|1G|8|@]|D|@]|E|$]]|$1|Q|3|R|5|6|7|1H|8|@$9|1I|A|1J|B|C]]|D|@]|E|$]]|$1|S|3|G|5|H|7|1K|8|@]|D|@]|E|$]]|$1|T|3|U|5|K|7|1L|8|@]|D|@]|E|$L|M]]|$1|V|3|W|5|K|7|1M|8|@]|D|@]|E|$L|M]]|$1|X|3|G|5|H|7|1N|8|@]|D|@]|E|$]]|$1|Y|3|Z|5|H|7|1O|8|@$9|1P|A|1Q|B|C]]|D|@]|E|$]]|$1|10|3|11|5|6|7|1R|8|@$9|1S|A|1T|B|C]]|D|@]|E|$]]|$1|12|3|G|5|H|7|1U|8|@]|D|@]|E|$]]|$1|13|3|14|5|K|7|1V|8|@]|D|@]|E|$L|M]]|$1|15|3|16|5|K|7|1W|8|@]|D|@]|E|$L|M]]|$1|17|3|G|5|H|7|1X|8|@]|D|@]|E|$]]|$1|18|3|-4|5|H|7|1Y|8|@]|D|@]|E|$]]]|19|$]]

<blockquote>
  <p><strong>Method 1:</strong> Using calc() property by wrapping the header and content in one div.</p>
</blockquote>

<p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-css lang-css prettyprint-override"><code>body,html{ margin:0px; padding:0px;height:100%}
.wrapper{height:calc(100% - 50px);}

footer{ height:50px; background:red;}</code></pre>
<pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div class="wrapper"&gt;
  &lt;nav id="primary"&gt;&lt;/nav&gt;
  &lt;nav id="secondary"&gt;&lt;/nav&gt;
  &lt;section id="maincontainer"&gt;
    &lt;div id="main"&gt;...&lt;/div&gt;
  &lt;/section&gt; 
 &lt;/div&gt; 
    &lt;footer&gt;
     &lt;div class="footer-inner"&gt;Footer&lt;/div&gt;
    &lt;/footer&gt;
  </code></pre>
</div>
</div>
</p>

<blockquote>
  <p><strong>Method 2:</strong> By using -ve height of footer with the wrapper element.</p>
</blockquote>

<p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-css lang-css prettyprint-override"><code>body,html{ margin:0px; padding:0px;height:100%}



.page-wrap {
  min-height: 100%;
  /* equal to footer height */
  margin-bottom: -50px; 
}
.page-wrap:after {
  content: "";
  display: block;
}
.site-footer, .page-wrap:after {
  height: 50px; 
}
.site-footer {
  background: red;
}</code></pre>
<pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div class="page-wrap"&gt;
  &lt;nav id="primary"&gt;&lt;/nav&gt;
  &lt;nav id="secondary"&gt;&lt;/nav&gt;
  &lt;section id="maincontainer"&gt;
    &lt;div id="main"&gt;...&lt;/div&gt;
  &lt;/section&gt; 
 &lt;/div&gt; 
    &lt;footer class="site-footer"&gt;
     &lt;div class="footer-inner"&gt;Footer&lt;/div&gt;
    &lt;/footer&gt;</code></pre>
</div>
</div>
</p>

<p><strong>EDIT</strong></p>

<blockquote>
  <p><strong>Method 3:</strong> using same structure and calc().</p>
</blockquote>

<p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-css lang-css prettyprint-override"><code>body,
html {
  margin: 0px;
  padding: 0px;
  height: 100%
}

#primary {
  height: 50px;
  background: green;
  width: 100%;
}

#secondary {
  height: 50px;
  background: yellow;
  width: 100%;
}

#maincontainer {
  width: 100%;
  height: calc(100% - 130px);
}

#main {
  height: 100%;
}

footer {
  background: red;
  height: 30px;
}</code></pre>
<pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;nav id="primary"&gt;Nav 1&lt;/nav&gt;
  &lt;nav id="secondary"&gt;Nav 2&lt;/nav&gt;
  &lt;section id="maincontainer"&gt;
    &lt;div id="main"&gt;...&lt;/div&gt;
    &lt;footer&gt;
     &lt;div class="footer-inner"&gt;...&lt;/div&gt;
    &lt;/footer&gt;
  &lt;/section&gt;</code></pre>
</div>
</div>
</p>


blocks|key|2718685|text|做这个|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2718686|<footer+style="position:+fixed;+bottom:+0;+width:+100%25;">+</footer>|code-block|syntax|javascript|2718687|您也可以阅读flex，它是所有现代浏览器所支持的。|offset|length|style|CODE|2718688|更新：，我读到了关于flex的文章，并试用了它。对我起作用了。希望这对你也是一样的。下面是我如何implemented.Here+main不是ID，而是<main>+div|BOLD|2718689|body+{
++++margin:+0;
++++display:+flex;
++++min-height:+100vh;
++++flex-direction:+column;
}

main+{
++++display:+block;
++++flex:+1+0+auto;
}|2718690|在这里，您可以阅读更多关于flex+https://css-tricks.com/snippets/css/a-guide-to-flexbox/的内容。|2718691|请记住，IE的旧版本不支持它。|2718692|entityMap|0|LINK|mutability|MUTABLE|url|https://css-tricks.com/snippets/css/a-guide-to-flexbox/^0|0|0|6|4|0|0|3|24|6|0|0|I|1J|0|0|0^^$0|@$1|2|3|4|5|6|7|13|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|14|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|15|8|@$I|16|J|17|K|L]]|9|@]|A|$]]|$1|M|3|N|5|6|7|18|8|@$I|19|J|1A|K|O]|$I|1B|J|1C|K|L]]|9|@]|A|$]]|$1|P|3|Q|5|D|7|1D|8|@]|9|@]|A|$E|F]]|$1|R|3|S|5|6|7|1E|8|@]|9|@$I|1F|J|1G|1|1H]]|A|$]]|$1|T|3|U|5|6|7|1I|8|@]|9|@]|A|$]]|$1|V|3|-4|5|6|7|1J|8|@]|9|@]|A|$]]]|W|$X|$5|Y|Z|10|A|$11|12]]]]

<p>Do this </p>

<pre><code>&lt;footer style="position: fixed; bottom: 0; width: 100%;"&gt; &lt;/footer&gt;
</code></pre>

<p>You can also read about <code>flex</code> it is supported by all modern browsers</p>

<p><strong>Update:</strong>
I read about flex and tried it. It worked for me. Hope it does the same for you. Here is how I implemented.Here main is not the ID it is the <code>&lt;main&gt;</code> div</p>

<pre><code>body {
    margin: 0;
    display: flex;
    min-height: 100vh;
    flex-direction: column;
}

main {
    display: block;
    flex: 1 0 auto;
}
</code></pre>

<p>Here you can read more about flex <a href="https://css-tricks.com/snippets/css/a-guide-to-flexbox/" rel="nofollow noreferrer">https://css-tricks.com/snippets/css/a-guide-to-flexbox/</a></p>

<p>Do keep in mind it is not supported by older versions of IE.</p>


blocks|key|3133005|text|使用bottom:0;+position:fixed作为页脚样式，您可以很容易地实现您想要的。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3133006|​|3133007|body,html{+margin:0px;+padding:0px;height:100%25}



.page-wrap+{
++min-height:+100%25;
++/*+equal+to+footer+height+*/
++margin-bottom:+-50px;+
}
.page-wrap:after+{
++content:+"";
++display:+block;
}
.site-footer,+.page-wrap:after+{
++position:+fixed;+
++bottom:+0;+
++width:+100%25;
++height:50px;
}
.site-footer+{
++background:+red;
}|code-block|syntax|javascript|3133008|<div+class="page-wrap">
++<nav+id="primary"></nav>
++<nav+id="secondary"></nav>
++<section+id="maincontainer">
++++<div+id="main">...</div>

++++<footer+class="site-footer">
+++++<div+class="footer-inner">Footer</div>
++++</footer>
++</section>+
+</div>+|3133009|3133010|希望能帮上忙。|3133011|entityMap^0|2|9|C|E|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@$9|U|A|V|B|C]|$9|W|A|X|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Y|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|Z|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|J|7|10|8|@]|D|@]|E|$K|L]]|$1|O|3|G|5|6|7|11|8|@]|D|@]|E|$]]|$1|P|3|Q|5|6|7|12|8|@]|D|@]|E|$]]|$1|R|3|-4|5|6|7|13|8|@]|D|@]|E|$]]]|S|$]]

<p>Using <code>bottom:0;</code> <code>position:fixed</code> for footer style You can easily achieve what you want.</p>

<p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-css lang-css prettyprint-override"><code>body,html{ margin:0px; padding:0px;height:100%}



.page-wrap {
  min-height: 100%;
  /* equal to footer height */
  margin-bottom: -50px; 
}
.page-wrap:after {
  content: "";
  display: block;
}
.site-footer, .page-wrap:after {
  position: fixed; 
  bottom: 0; 
  width: 100%;
  height:50px;
}
.site-footer {
  background: red;
}</code></pre>
<pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div class="page-wrap"&gt;
  &lt;nav id="primary"&gt;&lt;/nav&gt;
  &lt;nav id="secondary"&gt;&lt;/nav&gt;
  &lt;section id="maincontainer"&gt;
    &lt;div id="main"&gt;...&lt;/div&gt;

    &lt;footer class="site-footer"&gt;
     &lt;div class="footer-inner"&gt;Footer&lt;/div&gt;
    &lt;/footer&gt;
  &lt;/section&gt; 
 &lt;/div&gt; 
    </code></pre>
</div>
</div>
</p>

<p>Hope it helps.</p>


<p>I have this html structure with the section being basically my main content:</p>

<p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;html&gt;
&lt;head&gt;
&lt;body&gt;
  &lt;nav id="primary"&gt;
  &lt;nav id="secondary"&gt;
  &lt;section id="maincontainer"&gt;
    &lt;div id="main"&gt;...&lt;/div&gt;
    &lt;footer&gt;
     &lt;div class="footer-inner"&gt;...&lt;/div&gt;
    &lt;/footer&gt;
  &lt;/section&gt;
&lt;/body&gt;
&lt;/html&gt;</code></pre>
</div>
</div>
</p>

<p>Within the div with id 'main' there is content being dynamically loaded via ajax, so the height can vary. 
I need the footer to always be at the bottom, even for sub pages with barely any content not filling the page height.
Currently I have position absolute for the footer, which does not work for the dynamic content pages, the footer is stuck in the middle of the content (original window height position).</p>

<p>Is there a way to do this css only?
Thank you!</p>


footer at bottom with ajax loaded content

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我有这个html结构，这个部分基本上是我的主要内容：​<html><head><body>  <nav id="primary">  <nav id="secondary">  <section id="maincontainer">    <div id="main">...</div>    <footer>   ...

问底部有ajax加载内容的页脚
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问底部有ajax加载内容的页脚EN