问题描述
我想从表中选择 tds 的子集.
I want to select a subset of tds from a table.
我事先知道索引是什么,但它们实际上是随机的(不是奇数或偶数索引等).
I know before hand what the indexes are, but they are effectively random (not odd or even indexes, etc).
例如说我想选择第 0、第 5 和第 9 个 td.
For instance say I want to select the 0th, 5th and 9th td.
indexesToSelect = [0, 5, 9];
// 1) this selects the one by one
$('table td').eq(0)
$('table td').eq(5)
$('table td').eq(9)
// 2)this selects them as a group (with underscore / lodash)
var $myIndexes = $();
_.forEach(indexesToSelect, function (idx) {
$myIndexes = $myIndexes.add($('table td').eq(idx));
});
所以 (2) 有效,我正在使用它,但我想知道是否有使用 jQuery 的更自然的方法.
So (2) works and I am using that, but I wonder if there is a more natural way using jQuery.
类似于向 .eq()
传递一个索引数组?(这不起作用)
Something like passing .eq()
an array of indexes? (that doesn't work)
// does not work
$('table td').eq([0, 5, 9])
如果不是,我会为.eqMulti(array)
之类的东西写一个小插件.
If not I will write a small plugin for something like .eqMulti(array)
.
注意:这些 td 没有专门共享的类,因此无法根据类进行选择.
Note: there is no class that these tds share exclusively, so selecting based on class won't work.
推荐答案
我会用 .filter()
和 $.inArray()
:
var elements = $("table td").filter(function(i) {
return $.inArray(i, indexesToSelect) > -1;
});
另一种[更丑]的方式是映射到选择器:
Another [more ugly] way is mapping to a selector:
var elements = $($.map(indexesToSelect, function(i) {
return "td:eq(" + i + ")";
}).join(","), "table");
这篇关于使用 jQuery 通过 .eq() 选择多个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!