[英]add / remove a class inside previous or next parent
<div class='part'>
<div class='title'>title</div>
<div class='postitle'>323</div>
<div class='postitle'>323</div>
<div class='postitle'>323</div>
</div>
<div class='part'>
<div class='title'>title</div>
<div class='postitle'>323</div>
<div class='postitle'>323</div>
<div class='postitle'>323</div>
</div>
<div class='part'>
<div class='title'>title</div>
<div class='postitle'>323</div>
<div class='postitle'>323</div>
<div class='postitle'>323</div>
</div>
JS
$(document).keydown(function(e){
total = $('.postitle').length;
if (e.keyCode == 38 && $('.postitle').hasClass('pmarked') && $('.pmarked').index() > 0) {
e.preventDefault();
listup();
}
else if (e.keyCode == 40 && $('.postitle').hasClass('pmarked') && $('.pmarked').index() <= total-2) {
e.preventDefault();
listdown();
}
});
function listup(){
var prev = $('.pmarked').prevAll('.postitle:first');
$('.pmarked').removeClass('pmarked');
prev.addClass('pmarked');
}
function listdown(){
var next = $('.pmarked').nextAll('.postitle:first');
$('.pmarked').removeClass('pmarked');
next.addClass('pmarked');
}
因此,我想通過按鍵盤上arrow-up
和arrow-down
arrow-up
將.pmarked
類添加/刪除到.postitle
(而不是.title
)。
上面的代碼可以正常工作,但.part
是上一個prev/next
項目位於同一.part
div中。
如何跳到上一個或下一個.part
div?
試試這個,選擇元素的方式必須改變
$(document).keydown(function(e) { let index = $('.postitle').toArray().indexOf($('.pmarked')[0]); total = $('.postitle').length; if (e.keyCode == 38 && $('.postitle').hasClass('pmarked') && $('.pmarked').index() > 0) { e.preventDefault(); listup(index - 1); } else if (e.keyCode == 40 && $('.postitle').hasClass('pmarked') && $('.pmarked').index() <= total - 2) { e.preventDefault(); listdown(index > total - 2 ? 0 : index + 1); } }); function listup(index) { var prev = $('.postitle').eq(index); $('.pmarked').removeClass('pmarked'); prev.addClass('pmarked'); } function listdown(index) { var next = $('.postitle').eq(index); $('.pmarked').removeClass('pmarked'); next.addClass('pmarked'); }
.pmarked { background:pink; }
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <div class='part'> <div class='title'>title</div> <div class='postitle'>323</div> <div class='postitle'>323</div> <div class='postitle'>323</div> </div> <div class='part'> <div class='title'>title</div> <div class='postitle pmarked'>323</div> <div class='postitle'>323</div> <div class='postitle'>323</div> </div> <div class='part'> <div class='title'>title</div> <div class='postitle'>323</div> <div class='postitle'>323</div> <div class='postitle'>323</div> </div>
我得到了當前元素索引
let index = $('.postitle').toArray().indexOf($('.pmarked')[0]);
並通過index-1
計算上一個元素索引,並通過index > total - 2 ? 0 : index + 1
計算下一個元素索引index > total - 2 ? 0 : index + 1
index > total - 2 ? 0 : index + 1
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