使用Javascript通过索引获取HTML顺序列表中的元素 [英] Get Element in HTML Ordered List by Index Using Javascript
问题描述
我为这个解决方案寻找了很多东西,但是我惊奇地找不到任何东西。也许我只是没有寻找合适的词汇。我发现了一些关于通过元素获取索引的问题,但我需要相反的结果。
我试图使用javascript和jquery获取一个元素按列表中的索引列出。例如,如果我有这个列表:
< ol>
< li>零< / li>
< li> One< / li>
< li>两个< / li>
< li>三< / li>
< / ol>
我希望能够得到第一个( 到目前为止,我已经尝试了几件事: 一个基于获取对象索引的简单函数在使用id的列表中。 循环如下: 那么有没有办法做到这一点? 有很多方法可以做到这一点。您可以使用 :eq 选择器。像这样? 所以,这是零索引。你可以这样做: I looked quite a bit for a solution for this but I surprisingly couldn't find anything. Maybe I just didn't search for the right words. I found a bunch of questions about getting the index by the element, but I need the opposite. I'm trying to use javascript and jquery get an element in an ordered list by it's index in the list. For example, if I have this list: I would like to be able to get the first one ( So far I have tried a few things: A simple function based off of the getting the index of an object in a list using the id. A loop like this: So is there a way to do this?
Thanks. There are many ways to do this. You can use :eq selector. Something like this? So, as this is zero indexed. You could do:
这篇关于使用Javascript通过索引获取HTML顺序列表中的元素的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋! Zero code>)的索引值为0,或者第二个索引号(
One
)的索引值为1。
elem = list.index(0); //获取第一个元素,但这不是一件事情。
// elem是我目前的元素。
//从最后一个元素开始到第一个元素。
var elem = list.getLastChild(); //但是list.getLastChild()显然是
//不是东西,尽管它在这里([w3c link] [1])。
//从0开始并转到索引
//(可能/不需要= num之前的数据,但我想我可以)
for(var i = 0; i <= num; i ++){
//将elem设置为之前的兄弟
elem = elem.getPreviousSibling(); // getPreviousSibling可能不是
//好的东西,但是在破坏之前我还没有达到那么远。
}
//返回索引
的元素return elem;
Thanks。
var $ lis = $('ol li');
for(var i = 0; i <$ lis.length; i ++)
{
alert($('ol li:eq('+ i +')) ')。文本());
}
$('ol li:eq(0)')
获取第一个元素。
您也可以使用css, nth-child
, nth-type
选择器:
alert($('ol li:nth-child(1)')。text()); //这从1索引开始,非索引索引。
<ol>
<li>Zero</li>
<li>One</li>
<li>Two</li>
<li>Three</li>
</ol>
Zero
) by its index of 0, or the second one (One
) by its index of 1.
elem = list.index(0); //To get the first element, but this is not a thing.
//elem is the element I am currently at.
//Starting at the last element and going to the first.
var elem = list.getLastChild(); //But list.getLastChild() is apparently
//not a thing although it is here ([w3c link][1]).
//Start at 0 and go to the index
//(may/may not need the = before num, but I think I do)
for(var i=0; i<=num; i++){
//Set elem to it's previous sibling
elem = elem.getPreviousSibling(); //getPreviousSibling is probably not a thing as
//well but I couldn't get that far before it broke anyway.
}
//Return the element at the index
return elem;
var $lis = $('ol li');
for(var i=0; i < $lis.length; i++)
{
alert($('ol li:eq(' + i + ')').text());
}
$('ol li:eq(0)')
for getting the first element.
You can also use css, nth-child
, nth-of-type
selector: alert($('ol li:nth-child(1)').text()); // This starts with 1 index, non-zero indexed.