Question

我正在填写一个包含动态内容的无序列表，列表高度将填充内容，是否有人知道如何在无序列表中获得前3个li标签的高度？

产生的动态内容可能如下所示，所以我只想计算前3个li标签的高度。

<ul>
<li>23 Feb 2011<br />Synergy Launch new website...<br />Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nunc gravida lacus a ligula dictum dignissim....</li>
<li>23 Feb 2011<br />Expat children "receive improv...<br />Expat children enjoy a better standard of education whilst living abroad compared to their home country according to the HSBC Offshore Offspring Report,...</li>
<li>25 Feb 2011<br />London Market favours Landlord...<br />The lettings market has swung dramatically in favour of landlords as an average six applicants chase every available property in London. This is a dramatic rise...</li>
<li>23 Feb 2011<br />Synergy Launch new website...<br />Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nunc gravida lacus a ligula dictum dignissim....</li>
</ul>

感谢您的帮助学家

Answer 1

这为您提供了所有高度......但您可以轻松地将所需的代码放在函数中，以便在每个列表项上执行某些操作。

var sum = 0;

$('li:lt(3)').each(function() {
   sum += $(this).height();
});

http://jsfiddle.net/rnpAE/1/

编辑：将$('li').nextUntil(':eq(2)')缩短为$('li:lt(3)')

Answer 2

如果您想单独计算它们，请使用eq选择器

http://api.jquery.com/eq-selector/

var liHeight = $('li:eq(0)').outerHeight(); // Obtains height of first li

Answer 3

首先我将var设置为减1项...

var liTotalHeight = -24;

然后，对于每个项目，我添加li的高度..

liTotalHeight = liTotalHeight + $(this).outerHeight();

然后我设置ul的scrollTop ...

$(this).parent().scrollTop(liTotalHeight);

有点hacky，但最适合我

Answer 4

$('li').height(); // First
$('li').next().height(); // Second
$('li').next().next().height(); // Third

如果要包含填充/边距，请使用outerHeight。

jQuery获得前3个li标签的高度

4 个答案: