javascript 使用 jQuery 通过 .eq() 选择多个元素
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Use jQuery to select multiple elements with .eq()
提问by Sean
I want to select a subset of tds from a table.
我想从表中选择 tds 的子集。
I know before hand what the indexes are, but they are effectively random (not odd or even indexes, etc).
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)。
For instance say I want to select the 0th, 5th and 9th td.
例如说我想选择第 0、第 5 和第 9 个 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));
});
So (2) works and I am using that, but I wonder if there is a more natural way using jQuery.
所以 (2) 有效,我正在使用它,但我想知道是否有更自然的方式使用 jQuery。
Something like passing .eq()
an array of indexes? (that doesn't work)
像传递.eq()
索引数组之类的东西?(这不起作用)
// does not work
$('table td').eq([0, 5, 9])
If not I will write a small plugin for something like .eqMulti(array)
.
如果没有,我会为类似的东西写一个小插件.eqMulti(array)
。
Note: there is no class that these tds share exclusively, so selecting based on class won't work.
注意:这些 td 没有专门共享的类,因此基于类进行选择将不起作用。
回答by VisioN
I'd do it with .filter()
and $.inArray()
:
我会用.filter()
和来做$.inArray()
:
var elements = $("table td").filter(function(i) {
return $.inArray(i, indexesToSelect) > -1;
});
Another [more ugly] way is mapping to a selector:
另一种 [更丑陋] 的方式是映射到选择器:
var elements = $($.map(indexesToSelect, function(i) {
return "td:eq(" + i + ")";
}).join(","), "table");
回答by Sean
I wrapped VisioN's filter method into a jQuery plugin:
我将 VisioN 的过滤器方法封装到一个 jQuery 插件中:
$.fn.eqAnyOf = function (arrayOfIndexes) {
return this.filter(function(i) {
return $.inArray(i, arrayOfIndexes) > -1;
});
};
So now usage is nice and clean:
所以现在用法很好很干净:
var $tds = $('table td').eqAnyOf([1, 5, 9]);
回答by PSR
try this
试试这个
$('table td:eq(0), table td:eq(5), table td:eq(9)')
回答by zanetu
$('table td').filter(':eq(' + indexesToSelect.join('), :eq(') + ')')