我试图使用jQuery和CSS使用键盘箭头进行自定义选择，但我遇到了一些问题。如果有选项组，则不会选择下一个选项。
我相信问题发生在以下代码行中，因为它无法找到下一个选项，但如果您选择选项组中的一个选项，则可以选择下一个选项，直到您触及另一个选项选项组：
// Down
} else if (event.keyCode === 40) {
if (!$dropdown.hasClass('open')) {
$dropdown.trigger('click');
} else {
// In this line here, it can't find the next option
var $next = $focused_option.nextAll('.option:not(.disabled)').first();
if ($next.length > 0) {
$dropdown.find('.focus').removeClass('focus');
$next.addClass('focus');
}...// Rest of the key listeners
这里是完整的代码：
/* jQuery Nice Select - v1.1.0
https://github.com/hernansartorio/jquery-nice-select
Made by Hernán Sartorio
Customized by: Hugo Borges
Marco Messa
*/
(function ($) {
$.fn.niceSelect = function (method) {
// Methods
if (typeof method === 'string') {
if (method === 'update') {
this.each(function () {
var $select = $(this);
var $dropdown = $(this).next('.nice-select');
var open = $dropdown.hasClass('open');
var focused = $select.parents('.form-group-select').hasClass('focused');
if ($dropdown.length) {
$dropdown.remove();
create_nice_select($select);
if (open) {
$select.next().trigger('click');
} else if (focused) {
$select.parents('.form-group-select').toggleClass('focused');
}
}
});
} else if (method === 'destroy') {
this.each(function () {
var $select = $(this);
var $dropdown = $(this).next('.nice-select');
if ($dropdown.length) {
$dropdown.remove();
$select.css('display', '');
}
});
if ($('.nice-select').length === 0) {
$(document).off('.nice_select');
}
} else {
console.log('Method "' + method + '" does not exist.');
}
return this;
}
// Hide native select
this.hide();
// Create custom markup
this.each(function () {
var $select = $(this);
if (!$select.next().hasClass('nice-select')) {
create_nice_select($select);
}
});
function create_nice_select($select) {
$select.after($('<div></div>')
.addClass('nice-select')
.addClass($select.attr('class') || '')
.addClass($select.attr('disabled') ? 'disabled' : '')
.attr('tabindex', $select.attr('disabled') ? null : '0')
.html('<span class="current"></span><ul class="list"></ul>')
);
var $dropdown = $select.next();
var $options = $select.find('option');
var $optgroups = $select.find('optgroup');
var $selected = $select.find('option:selected');
$dropdown.find('.current').html($selected.data('display') || $selected.text());
$options.each(function () {
var $option = $(this);
var display = $option.data('display');
var group = $option.parents('optgroup').data('i');
$dropdown.find('ul').append($('<li></li>')
.attr('data-value', $option.val())
.attr('data-display', (display || null))
.attr('data-group', (group || null))
.addClass('option' +
($option.is(':selected') ? ' selected' : '') +
($option.is(':disabled') ? ' disabled' : ''))
.html($option.text())
);
});
$optgroups.each(function(i, g) {
label = $(g).attr('label');
$dropdown.find('ul li').filter(function() {
return $(this).data('group') === $(g).data('i');
})
.wrapAll('<div class="optgroup"/>')
.parent()
.prepend('<span class="label">' + label + '</span>');
});
}
/* Event listeners */
// Unbind existing events in case that the plugin has been initialized before
$(document).off('.nice_select');
// Open/close
$(document).on('click.nice_select', '.nice-select', function () {
var $dropdown = $(this);
$('.nice-select').not($dropdown).removeClass('open');
$dropdown.toggleClass('open');
if ($dropdown.hasClass('open')) {
$dropdown.find('.option');
$dropdown.find('.focus').removeClass('focus');
$dropdown.find('.selected').addClass('focus');
} else {
$dropdown.focus();
}
});
// Close when clicking outside
$(document).on('click.nice_select', function (event) {
if ($(event.target).closest('.nice-select').length === 0) {
$('.nice-select').removeClass('open').find('.option');
}
});
// Animation loading a page
$('select').on('blur', function (e) {
$(this).parents('.form-group-select').toggleClass('focused', (e.type === 'focus' || this.value !== ''));
}).trigger('blur');
// Option click
$(document).on('click.nice_select', '.nice-select .option:not(.disabled)', function () {
var $option = $(this);
var $dropdown = $option.closest('.nice-select');
$dropdown.find('.selected').removeClass('selected');
$option.addClass('selected');
var text = $option.data('display') || $option.text();
$dropdown.find('.current').text(text);
$dropdown.prev('select').val($option.data('value')).trigger('change');
// Animation
$(this).parents('.form-group-select').toggleClass('focused', ($option.data('value') !== ''));
});
// Keyboard events
$(document).on('keydown.nice_select', '.nice-select', function (event) {
console.log(event.keyCode);
var $dropdown = $(this);
var $focused_option = $($dropdown.find('.focus') || $dropdown.find('.list .option.selected'));
// Space or Enter
if (event.keyCode === 32 || event.keyCode === 13) {
if ($dropdown.hasClass('open')) {
$focused_option.trigger('click');
} else {
$dropdown.trigger('click');
}
return false;
// Down
} else if (event.keyCode === 40) {
if (!$dropdown.hasClass('open')) {
$dropdown.trigger('click');
} else {
var $next = $focused_option.nextAll('.option:not(.disabled)').first();
if ($next.length > 0) {
$dropdown.find('.focus').removeClass('focus');
$next.addClass('focus');
}
}
return false;
// Up
} else if (event.keyCode === 38) {
if (!$dropdown.hasClass('open')) {
$dropdown.trigger('click');
} else {
var $prev = $focused_option.prevAll('.option:not(.disabled)').first();
if ($prev.length > 0) {
$dropdown.find('.focus').removeClass('focus');
$prev.addClass('focus');
}
}
return false;
// Esc
} else if (event.keyCode === 27) {
if ($dropdown.hasClass('open')) {
$dropdown.trigger('click');
}
// Tab
} else if (event.keyCode === 9) {
if ($dropdown.hasClass('open')) {
return false;
}
}
});
return this;
};
}(jQuery));
$('select').niceSelect();.control-label {
pointer-events: none;
position: absolute;
transform: translate3d(5px, 22px, 0) scale(1);
transform-origin: left top;
transition: 240ms;
}
.form-group-select.focused .control-label {
transform: scale(0.75);
}
.form-group-select {
width: 100%;
margin-top: 20px;
position: relative;
height: 45px;
float: left;
}
.nice-select:before {
width: 100%;
height: 1px;
background: #0091FF;
position: absolute;
left: 0;
bottom: 0;
content: '';
transform: scaleX(0);
transition: ease-in-out 240ms all;
}
.nice-select.open::before {
transform: scaleX(1);
}
.nice-select {
-webkit-tap-highlight-color: transparent;
box-sizing: border-box;
clear: both;
cursor: pointer;
display: block;
height: 42px;
line-height: 40px;
outline: none;
position: relative;
text-align: left !important;
-webkit-transition: all 0.2s ease-in-out;
transition: all 0.2s ease-in-out;
-webkit-user-select: none;
-moz-user-select: none;
-ms-user-select: none;
white-space: nowrap;
width: 100%;
border: 0 solid #484848;
border-bottom-width: 1px;
margin-top: 3px;
}
.nice-select span {
margin-left: 5px;
}
.optgroup span {
padding-left: 10px;
font-style: italic;
}
.nice-select:hover, .nice-select:focus {
border-color: #0091FF;
}
.nice-select:after {
border-bottom: 2px solid #484848;
border-right: 2px solid #484848;
content: '';
display: block;
height: 5px;
margin-top: -4px;
pointer-events: none;
position: absolute;
right: 12px;
top: 50%;
-webkit-transform-origin: 66% 66%;
-ms-transform-origin: 66% 66%;
transform-origin: 66% 66%;
-webkit-transform: rotate(45deg);
-ms-transform: rotate(45deg);
transform: rotate(45deg);
-webkit-transition: all 0.15s ease-in-out;
transition: all 0.15s ease-in-out;
width: 5px;
}
.nice-select.open:after {
-webkit-transform: rotate(-135deg);
-ms-transform: rotate(-135deg);
transform: rotate(-135deg);
}
.nice-select.open .list {
color: #484848;
opacity: 1;
pointer-events: auto;
-webkit-transform: scale(1) translateY(0);
-ms-transform: scale(1) translateY(0);
transform: scale(1) translateY(0);
}
.nice-select.disabled {
border-color: #ededed;
color: #999;
pointer-events: none;
}
.nice-select.disabled:after {
border-color: #cccccc;
}
.nice-select .list {
background-color: #FFF;
border-radius: 4px;
box-sizing: border-box;
margin-top: 4px;
opacity: 0;
overflow: hidden;
padding: 0;
pointer-events: none;
position: absolute;
top: 100%;
left: 0;
-webkit-transform-origin: 50% 0;
-ms-transform-origin: 50% 0;
transform-origin: 50% 0;
-webkit-transform: scale(0.75) translateY(-21px);
-ms-transform: scale(0.75) translateY(-21px);
transform: scale(0.75) translateY(-21px);
-webkit-transition: all 0.2s cubic-bezier(0.5, 0, 0, 1.25), opacity 0.15s ease-out;
transition: all 0.2s cubic-bezier(0.5, 0, 0, 1.25), opacity 0.15s ease-out;
width: 100%;
z-index: 99;
}
.nice-select .list:before {
content: '';
display: block;
height: 7px;
border-radius: 4px 4px 0px 0px;
}
.nice-select .list:after {
content: '';
display: block;
height: 7px;
border-radius: 0px 0px 4px 4px;
}
.nice-select .option {
cursor: pointer;
line-height: 40px;
list-style: none;
min-height: 40px;
outline: none;
padding-left: 18px;
padding-right: 29px;
text-align: left;
border-left: 7px solid #FFF;
}
.nice-select .option:hover, .nice-select .focus {
background: #EEEEEE;
border-left: 7px solid #F65314;
}
.nice-select .list:hover .option:not(:hover) {
background-color: transparent !important;
border-left: 7px solid transparent !important;
}
.nice-select .option.selected {
font-weight: bold;
}
.nice-select .option.disabled {
background-color: transparent;
color: #999;
cursor: default;
}
.no-csspointerevents .nice-select .list {
display: none;
}
.no-csspointerevents .nice-select.open .list {
display: block;
}<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js">
</script>
<div class='form-group-select'>
<label class='control-label'>SIM?</label>
<select name='gostou'>
<option value=""></option>
<optgroup label='PRODUTOS' data-i="1">
<option value="s">SIM</option>
<option value="n">NÃO</option>
<optgroup label='PRODUTOS' data-i="2">
<option value="s">SIM</option>
<option value="n">NÃO</option>
</select>
</div>
答案 0 :(得分：3)
.nextAll()只找到兄弟姐妹。将选项分组为嵌套DIV以匹配选项组时，只有同一选项组的同一级别中的选项才是兄弟。
不是使用.nextAll()，而是获取所有选项的集合，在集合中查找当前元素的索引，然后递增该索引以查找下一个选项。
var $all_options = $dropdown.find(".option:not(.disabled)");
var $next = $all_options.eq($all_options.index($focused_option) + 1);
/* jQuery Nice Select - v1.1.0
https://github.com/hernansartorio/jquery-nice-select
Made by Hernán Sartorio
Customized by: Hugo Borges
Marco Messa
*/
(function($) {
$.fn.niceSelect = function(method) {
// Methods
if (typeof method === 'string') {
if (method === 'update') {
this.each(function() {
var $select = $(this);
var $dropdown = $(this).next('.nice-select');
var open = $dropdown.hasClass('open');
var focused = $select.parents('.form-group-select').hasClass('focused');
if ($dropdown.length) {
$dropdown.remove();
create_nice_select($select);
if (open) {
$select.next().trigger('click');
} else if (focused) {
$select.parents('.form-group-select').toggleClass('focused');
}
}
});
} else if (method === 'destroy') {
this.each(function() {
var $select = $(this);
var $dropdown = $(this).next('.nice-select');
if ($dropdown.length) {
$dropdown.remove();
$select.css('display', '');
}
});
if ($('.nice-select').length === 0) {
$(document).off('.nice_select');
}
} else {
console.log('Method "' + method + '" does not exist.');
}
return this;
}
// Hide native select
this.hide();
// Create custom markup
this.each(function() {
var $select = $(this);
if (!$select.next().hasClass('nice-select')) {
create_nice_select($select);
}
});
function create_nice_select($select) {
$select.after($('<div></div>')
.addClass('nice-select')
.addClass($select.attr('class') || '')
.addClass($select.attr('disabled') ? 'disabled' : '')
.attr('tabindex', $select.attr('disabled') ? null : '0')
.html('<span class="current"></span><ul class="list"></ul>')
);
var $dropdown = $select.next();
var $options = $select.find('option');
var $optgroups = $select.find('optgroup');
var $selected = $select.find('option:selected');
$dropdown.find('.current').html($selected.data('display') || $selected.text());
$options.each(function() {
var $option = $(this);
var display = $option.data('display');
var group = $option.parents('optgroup').data('i');
$dropdown.find('ul').append($('<li></li>')
.attr('data-value', $option.val())
.attr('data-display', (display || null))
.attr('data-group', (group || null))
.addClass('option' +
($option.is(':selected') ? ' selected' : '') +
($option.is(':disabled') ? ' disabled' : ''))
.html($option.text())
);
});
$optgroups.each(function(i, g) {
label = $(g).attr('label');
$dropdown.find('ul li').filter(function() {
return $(this).data('group') === $(g).data('i');
})
.wrapAll('<div class="optgroup"/>')
.parent()
.prepend('<span class="label">' + label + '</span>');
});
}
/* Event listeners */
// Unbind existing events in case that the plugin has been initialized before
$(document).off('.nice_select');
// Open/close
$(document).on('click.nice_select', '.nice-select', function() {
var $dropdown = $(this);
$('.nice-select').not($dropdown).removeClass('open');
$dropdown.toggleClass('open');
if ($dropdown.hasClass('open')) {
$dropdown.find('.option');
$dropdown.find('.focus').removeClass('focus');
$dropdown.find('.selected').addClass('focus');
} else {
$dropdown.focus();
}
});
// Close when clicking outside
$(document).on('click.nice_select', function(event) {
if ($(event.target).closest('.nice-select').length === 0) {
$('.nice-select').removeClass('open').find('.option');
}
});
// Animation loading a page
$('select').on('blur', function(e) {
$(this).parents('.form-group-select').toggleClass('focused', (e.type === 'focus' || this.value !== ''));
}).trigger('blur');
// Option click
$(document).on('click.nice_select', '.nice-select .option:not(.disabled)', function() {
var $option = $(this);
var $dropdown = $option.closest('.nice-select');
$dropdown.find('.selected').removeClass('selected');
$option.addClass('selected');
var text = $option.data('display') || $option.text();
$dropdown.find('.current').text(text);
$dropdown.prev('select').val($option.data('value')).trigger('change');
// Animation
$(this).parents('.form-group-select').toggleClass('focused', ($option.data('value') !== ''));
});
// Keyboard events
$(document).on('keydown.nice_select', '.nice-select', function(event) {
console.log(event.keyCode);
var $dropdown = $(this);
var $focused_option = $($dropdown.find('.focus') || $dropdown.find('.list .option.selected'));
// Space or Enter
if (event.keyCode === 32 || event.keyCode === 13) {
if ($dropdown.hasClass('open')) {
$focused_option.trigger('click');
} else {
$dropdown.trigger('click');
}
return false;
// Down
} else if (event.keyCode === 40) {
if (!$dropdown.hasClass('open')) {
$dropdown.trigger('click');
} else {
var $all_options = $dropdown.find(".option:not(.disabled)");
var $next = $all_options.eq($all_options.index($focused_option) + 1);
if ($next.length > 0) {
$dropdown.find('.focus').removeClass('focus');
$next.addClass('focus');
}
}
return false;
// Up
} else if (event.keyCode === 38) {
if (!$dropdown.hasClass('open')) {
$dropdown.trigger('click');
} else {
var $all_options = $dropdown.find(".option:not(.disabled)");
var $prev = $all_options.eq($all_options.index($focused_option) - 1);
if ($prev.length > 0) {
$dropdown.find('.focus').removeClass('focus');
$prev.addClass('focus');
}
}
return false;
// Esc
} else if (event.keyCode === 27) {
if ($dropdown.hasClass('open')) {
$dropdown.trigger('click');
}
// Tab
} else if (event.keyCode === 9) {
if ($dropdown.hasClass('open')) {
return false;
}
}
});
return this;
};
}(jQuery));
$('select').niceSelect();.control-label {
pointer-events: none;
position: absolute;
transform: translate3d(5px, 22px, 0) scale(1);
transform-origin: left top;
transition: 240ms;
}
.form-group-select.focused .control-label {
transform: scale(0.75);
}
.form-group-select {
width: 100%;
margin-top: 20px;
position: relative;
height: 45px;
float: left;
}
.nice-select:before {
width: 100%;
height: 1px;
background: #0091FF;
position: absolute;
left: 0;
bottom: 0;
content: '';
transform: scaleX(0);
transition: ease-in-out 240ms all;
}
.nice-select.open::before {
transform: scaleX(1);
}
.nice-select {
-webkit-tap-highlight-color: transparent;
box-sizing: border-box;
clear: both;
cursor: pointer;
display: block;
height: 42px;
line-height: 40px;
outline: none;
position: relative;
text-align: left !important;
-webkit-transition: all 0.2s ease-in-out;
transition: all 0.2s ease-in-out;
-webkit-user-select: none;
-moz-user-select: none;
-ms-user-select: none;
white-space: nowrap;
width: 100%;
border: 0 solid #484848;
border-bottom-width: 1px;
margin-top: 3px;
}
.nice-select span {
margin-left: 5px;
}
.optgroup span {
padding-left: 10px;
font-style: italic;
}
.nice-select:hover,
.nice-select:focus {
border-color: #0091FF;
}
.nice-select:after {
border-bottom: 2px solid #484848;
border-right: 2px solid #484848;
content: '';
display: block;
height: 5px;
margin-top: -4px;
pointer-events: none;
position: absolute;
right: 12px;
top: 50%;
-webkit-transform-origin: 66% 66%;
-ms-transform-origin: 66% 66%;
transform-origin: 66% 66%;
-webkit-transform: rotate(45deg);
-ms-transform: rotate(45deg);
transform: rotate(45deg);
-webkit-transition: all 0.15s ease-in-out;
transition: all 0.15s ease-in-out;
width: 5px;
}
.nice-select.open:after {
-webkit-transform: rotate(-135deg);
-ms-transform: rotate(-135deg);
transform: rotate(-135deg);
}
.nice-select.open .list {
color: #484848;
opacity: 1;
pointer-events: auto;
-webkit-transform: scale(1) translateY(0);
-ms-transform: scale(1) translateY(0);
transform: scale(1) translateY(0);
}
.nice-select.disabled {
border-color: #ededed;
color: #999;
pointer-events: none;
}
.nice-select.disabled:after {
border-color: #cccccc;
}
.nice-select .list {
background-color: #FFF;
border-radius: 4px;
box-sizing: border-box;
margin-top: 4px;
opacity: 0;
overflow: hidden;
padding: 0;
pointer-events: none;
position: absolute;
top: 100%;
left: 0;
-webkit-transform-origin: 50% 0;
-ms-transform-origin: 50% 0;
transform-origin: 50% 0;
-webkit-transform: scale(0.75) translateY(-21px);
-ms-transform: scale(0.75) translateY(-21px);
transform: scale(0.75) translateY(-21px);
-webkit-transition: all 0.2s cubic-bezier(0.5, 0, 0, 1.25), opacity 0.15s ease-out;
transition: all 0.2s cubic-bezier(0.5, 0, 0, 1.25), opacity 0.15s ease-out;
width: 100%;
z-index: 99;
}
.nice-select .list:before {
content: '';
display: block;
height: 7px;
border-radius: 4px 4px 0px 0px;
}
.nice-select .list:after {
content: '';
display: block;
height: 7px;
border-radius: 0px 0px 4px 4px;
}
.nice-select .option {
cursor: pointer;
line-height: 40px;
list-style: none;
min-height: 40px;
outline: none;
padding-left: 18px;
padding-right: 29px;
text-align: left;
border-left: 7px solid #FFF;
}
.nice-select .option:hover,
.nice-select .focus {
background: #EEEEEE;
border-left: 7px solid #F65314;
}
.nice-select .list:hover .option:not(:hover) {
background-color: transparent !important;
border-left: 7px solid transparent !important;
}
.nice-select .option.selected {
font-weight: bold;
}
.nice-select .option.disabled {
background-color: transparent;
color: #999;
cursor: default;
}
.no-csspointerevents .nice-select .list {
display: none;
}
.no-csspointerevents .nice-select.open .list {
display: block;
}<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js">
</script>
<div class='form-group-select'>
<label class='control-label'>SIM?</label>
<select name='gostou'>
<option value=""></option>
<optgroup label='PRODUTOS' data-i="1">
<option value="s">SIM</option>
<option value="n">NÃO</option>
<optgroup label='PRODUTOS' data-i="2">
<option value="s">SIM</option>
<option value="n">NÃO</option>
</select>
</div>