blocks|key|4179153|text|您可以使用jquery+.height()方法来计算窗口高度。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4179154|根据窗口高度居中div的Jquery代码：|4179155|++++var+winH+=+$(window).height();+//--+For+calculate+window+height+
++++var+winW+=+$(window).width();+//--+For+calculate+window+width
++++$('#MyDiv').css('top',+winH+/+2+-+$('#MyDiv').height()+/+2);+//--+For+centering+div+according+to+window+height
++++$('#MyDiv').css('left',+winW+/+2+-+$('#MyDiv').width()+/+2);+//--+For+centering+div+according+to+window+width|code-block|syntax|javascript|4179156|entityMap^0|C|9|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|R|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|S|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|N|$]]

You can use jquery <code>.height()</code> method for calculate the window height.

Jquery code for centering a div according to window height: 

<pre><code> var winH = $(window).height(); //-- For calculate window height 
 var winW = $(window).width(); //-- For calculate window width
 $('#MyDiv').css('top', winH / 2 - $('#MyDiv').height() / 2); //-- For centering div according to window height
 $('#MyDiv').css('left', winW / 2 - $('#MyDiv').width() / 2); //-- For centering div according to window width
</code></pre>

blocks|key|792787|text|对高度和宽度的变化作出反应的函数|type|unstyled|depth|inlineStyleRanges|entityRanges|data|792788|html:|offset|length|style|BOLD|792789|<div+id="mydiv1">
+++<div+id="mydiv2">
+++++++Middle+of+Middle+:)
+++</div>
</div>|code-block|syntax|javascript|792790|js+jquery|792791|它也可以是编程中的一个函数，但我认为是时候更清楚了|792792|function+SetWidthAndHeight(getelement)+{
++++var+winH+=+$(window).height();
++++var+winW+=+$(window).width();
++++getelement.css('top',+winH+/+2+-+getelement.height()+/+2);
++++getelement.css('left',+winW+/+2+-+getelement.width()+/+2);
}
function+SetCenterOfAreDiv(ele,from)+{
++++var+winH+=+from.height();
++++var+winW+=+from.width();
++++ele.css('top',+winH+/+2+-+ele.height()+/+2);
++++ele.css('left',+winW+/+2+-+ele.width()+/+2);
}
$(function+()+{
++++//+on+change+orientation
++++window.addEventListener("orientationchange",+function+()+{
++++++++SetWidthAndHeight($('#mydiv1'));
++++++++SetCenterOfAreDiv($('#mydiv2'),$('#mydiv1'));
++++},+false);
++++//+on+change+resize
++++window.addEventListener("resize",+function+()+{
++++++++SetWidthAndHeight($('#mydiv1'));
++++++++SetCenterOfAreDiv($('#mydiv2'),$('#mydiv1'));
++++},+false);
});

SetWidthAndHeight($('#mydiv1'));
SetCenterOfAreDiv($('#mydiv2'),$('#mydiv1'));|792793|css|792794|#mydiv1+{
++++height:100px;
++++width:80%25;
++++background-color:green;
++++position:absolute;
}
#mydiv2+{
++++height:50px;
++++width:30%25;
++++background-color:blue;
++++position:absolute;
++++text-align:center;
++++color:#FFF;
}|792795|这里是现场演示：http://jsfiddle.net/A7PWR/|792796|entityMap|0|LINK|mutability|MUTABLE|url|http://jsfiddle.net/A7PWR/^0|0|0|5|0|0|0|9|0|0|0|0|3|0|0|8|Q|0|0^^$0|@$1|2|3|4|5|6|7|16|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|17|8|@$D|18|E|19|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|1A|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|1B|8|@$D|1C|E|1D|F|G]]|9|@]|A|$]]|$1|O|3|P|5|6|7|1E|8|@]|9|@]|A|$]]|$1|Q|3|R|5|J|7|1F|8|@]|9|@]|A|$K|L]]|$1|S|3|T|5|6|7|1G|8|@$D|1H|E|1I|F|G]]|9|@]|A|$]]|$1|U|3|V|5|J|7|1J|8|@]|9|@]|A|$K|L]]|$1|W|3|X|5|6|7|1K|8|@]|9|@$D|1L|E|1M|1|1N]]|A|$]]|$1|Y|3|-4|5|6|7|1O|8|@]|9|@]|A|$]]]|Z|$10|$5|11|12|13|A|$14|15]]]]

A function that reacts to changes in heights and widths

html:

<pre><code>&lt;div id="mydiv1"&gt;
 &lt;div id="mydiv2"&gt;
 &lt;p&gt;Middle of Middle :)&lt;/p&gt;
 &lt;/div&gt;
&lt;/div&gt;
</code></pre>

js jquery

It could also be a function in programming but I think it is time more clearly

<pre><code>function SetWidthAndHeight(getelement) {
 var winH = $(window).height();
 var winW = $(window).width();
 getelement.css('top', winH / 2 - getelement.height() / 2);
 getelement.css('left', winW / 2 - getelement.width() / 2);
}
function SetCenterOfAreDiv(ele,from) {
 var winH = from.height();
 var winW = from.width();
 ele.css('top', winH / 2 - ele.height() / 2);
 ele.css('left', winW / 2 - ele.width() / 2);
}
$(function () {
 // on change orientation
 window.addEventListener("orientationchange", function () {
 SetWidthAndHeight($('#mydiv1'));
 SetCenterOfAreDiv($('#mydiv2'),$('#mydiv1'));
 }, false);
 // on change resize
 window.addEventListener("resize", function () {
 SetWidthAndHeight($('#mydiv1'));
 SetCenterOfAreDiv($('#mydiv2'),$('#mydiv1'));
 }, false);
});

SetWidthAndHeight($('#mydiv1'));
SetCenterOfAreDiv($('#mydiv2'),$('#mydiv1'));
</code></pre>

css

<pre><code>#mydiv1 {
 height:100px;
 width:80%;
 background-color:green;
 position:absolute;
}
#mydiv2 {
 height:50px;
 width:30%;
 background-color:blue;
 position:absolute;
 text-align:center;
 color:#FFF;
}
</code></pre>

Here the live Demo:
<a href="http://jsfiddle.net/A7PWR/" rel="nofollow">http://jsfiddle.net/A7PWR/</a>

blocks|key|799823|text|如果您已经知道元素的高度，那么它只有CSS：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|799824|.element+{
++position:+absolute;
++top:+50%25;+left:+50%25;
++width:+500px;
++height:+500px;
++margin:+-250px+0+0+-250px;
++background:+#FFF;
}|code-block|syntax|javascript|799825|如果你不知道元素的宽度和高度。你可以把它和一些javascript结合起来。|799826|var+$element+=+$('.element');

$element.css({
++marginTop:+0+-+Math.round(+$element.height()+/+2+),
++marginLeft:+0+-+Math.round(+$element.width()+/+2+)
});|799827|希望这能有所帮助:)|799828|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

If you already know the height of the element it's CSS only:

<pre><code>.element {
 position: absolute;
 top: 50%; left: 50%;
 width: 500px;
 height: 500px;
 margin: -250px 0 0 -250px;
 background: #FFF;
}
</code></pre>

If you don't know the element width and height. You can combine it with a little bit of javascript.

<pre><code>var $element = $('.element');

$element.css({
 marginTop: 0 - Math.round( $element.height() / 2 ),
 marginLeft: 0 - Math.round( $element.width() / 2 )
});
</code></pre>

Hope that helps :)

blocks|key|2713327|text|如果您要做的只是将div放在屏幕的中央，则不需要jQuery/JavaScript来完成此操作。请改用CSS。它更好、更快，而且在动态定位时，您不会(潜在地)看到元素的“逐个像素”“机器人”移动。下面是如何使用CSS完成此操作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2713328|.centerBox+{
++position:+absolute;
++width:+300px;
++height:+4000px;
++top:+50%25;
++left:+50%25;
++margin-top:+-200px;
++margin-left:+-150px;
}|code-block|syntax|javascript|2713329|所以你可以像这样使用它：|2713330|...
<div+class="centerBox">+bla+bla+bla+</div>
...|2713331|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

If all you are trying to do is to position a div in the center of the screen, you do not need jQuery/JavaScript to do it. Use CSS instead. It is better, faster, and you will not (potentially) see the "pixel-by-pixel" "robotic" movement of an element when dynamically positioning. Here is how to do it with CSS:

<pre><code>.centerBox {
 position: absolute;
 width: 300px;
 height: 4000px;
 top: 50%;
 left: 50%;
 margin-top: -200px;
 margin-left: -150px;
}
</code></pre>

So then you just use it like this:

<pre><code>...
&lt;div class="centerBox"&gt; bla bla bla &lt;/div&gt;
...
</code></pre>

I am building a new website using Bootstrap and some Jquery. Is there a way to calculate the screen height and centering a div vertically based on the screen height?
I am not used to Jquery, but managed to do som other stuff anyway, but please be gentle :-)

Calculating screen height and centering

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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我正在建立一个新的网站使用Bootstrap和一些Jquery。有没有一种方法可以计算屏幕高度并根据屏幕高度垂直居中div？我不习惯Jquery，但我还是设法做了一些其他的事情，但请温文点:-)

问计算屏幕高度和居中
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