演示: 点击打开链接
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
body {
font-family: 'Open Sans';
}
.container {
margin: 10px auto;
max-width: 640px;
}
.fs-wrap {
position: relative;
display: inline-block;
width: 200px;
font-size: 12px;
line-height: 1;
}
.fs-label-wrap {
position: relative;
border: 1px solid #ccc;
cursor: default;
}
.fs-label-wrap,
.fs-dropdown {
-webkit-user-select: none;
-moz-user-select: none;
-ms-user-select: none;
user-select: none;
}
.fs-label-wrap .fs-label {
padding: 4px 22px 4px 8px;
text-overflow: ellipsis;
white-space: nowrap;
overflow: hidden;
}
.fs-arrow {
width: 0;
height: 0;
border-left: 6px solid transparent;
border-right: 6px solid transparent;
border-top: 6px solid #000;
position: absolute;
top: 0;
right: 5px;
bottom: 0;
margin: auto;
}
.fs-dropdown {
position: absolute;
background-color: #fff;
border: 1px solid #ccc;
margin-top: 5px;
width: 100%;
z-index: 1000;
}
.fs-dropdown .fs-options {
max-height: 200px;
overflow: auto;
}
.fs-search input {
width: 100%;
padding: 2px 4px;
border: 0;
}
.fs-option,
.fs-search,
.fs-optgroup-label {
padding: 6px 8px;
border-bottom: 1px solid #eee;
cursor: default;
}
.fs-option {
cursor: pointer;
}
.fs-option.hl {
background-color: #f5f5f5;
}
.fs-wrap.multiple .fs-option {
position: relative;
padding-left: 30px;
}
.fs-wrap.multiple .fs-checkbox {
position: absolute;
display: block;
width: 30px;
top: 0;
left: 0;
bottom: 0;
}
.fs-wrap.multiple .fs-option .fs-checkbox i {
position: absolute;
margin: auto;
left: 0;
right: 0;
top: 0;
bottom: 0;
width: 14px;
height: 14px;
border: 1px solid #aeaeae;
border-radius: 2px;
background-color: #fff;
}
.fs-wrap.multiple .fs-option.selected .fs-checkbox i {
background-color: rgb(17, 169, 17);
border-color: transparent;
background-image: url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAgAAAAGCAYAAAD+Bd/7AAAABHNCSVQICAgIfAhkiAAAAAlwSFlzAAALEgAACxIB0t1+/AAAABx0RVh0U29mdHdhcmUAQWRvYmUgRmlyZXdvcmtzIENTNXG14zYAAABMSURBVAiZfc0xDkAAFIPhd2Kr1WRjcAExuIgzGUTIZ/AkImjSofnbNBAfHvzAHjOKNzhiQ42IDFXCDivaaxAJd0xYshT3QqBxqnxeHvhunpu23xnmAAAAAElFTkSuQmCC');
background-repeat: no-repeat;
background-position: center;
}
.fs-wrap .fs-option:hover {
background-color: #f5f5f5;
}
.fs-optgroup-label {
font-weight: bold;
}
.hidden {
display: none;
}
</style>
</head>
<body>
<div id="main_demo">
<div class="container">
<select class="demo" multiple="multiple">
<optgroup label="Languages">
<option value="cp">C++</option>
<option value="cs">C#</option>
<option value="oc">Object C</option>
<option value="c">C</option>
</optgroup>
<optgroup label="Scripts">
<option value="js">JavaScript</option>
<option value="php">PHP</option>
<option value="asp">ASP</option>
<option value="jsp">JSP</option>
</optgroup>
</select>
</div>
<script src="jquery-3.2.1.min.js"></script>
<script>
$(function () {
$('.demo').fSelect();
});
(function ($) {
$.fn.fSelect = function (options) {
if (typeof options == 'string') {
var settings = options;
}
else {
var settings = $.extend({
placeholder: 'Select some options',
numDisplayed: 3,
overflowText: '{n} selected',
searchText: 'Search',
showSearch: true
}, options);
}
/**
* Constructor
*/
function fSelect(select, settings) {
this.$select = $(select);
this.settings = settings;
this.create();
}
/**
* Prototype class
*/
fSelect.prototype = {
create: function () {
var multiple = this.$select.is('[multiple]') ? ' multiple' : '';
this.$select.wrap('<div class="fs-wrap' + multiple + '"></div>');
this.$select.before('<div class="fs-label-wrap"><div class="fs-label">' + this.settings.placeholder + '</div><span class="fs-arrow"></span></div>');
this.$select.before('<div class="fs-dropdown hidden"><div class="fs-options"></div></div>');
this.$select.addClass('hidden');
this.$wrap = this.$select.closest('.fs-wrap');
this.reload();
},
reload: function () {
if (this.settings.showSearch) {
var search = '<div class="fs-search"><input type="search" placeholder="' + this.settings.searchText + '" /></div>';
this.$wrap.find('.fs-dropdown').prepend(search);
}
var choices = this.buildOptions(this.$select);
this.$wrap.find('.fs-options').html(choices);
this.reloadDropdownLabel();
},
destroy: function () {
this.$wrap.find('.fs-label-wrap').remove();
this.$wrap.find('.fs-dropdown').remove();
this.$select.unwrap().removeClass('hidden');
},
buildOptions: function ($element) {
var $this = this;
var choices = '';
$element.children().each(function (i, el) {
var $el = $(el);
if ('optgroup' == $el.prop('nodeName').toLowerCase()) {
choices += '<div class="fs-optgroup">';
choices += '<div class="fs-optgroup-label">' + $el.prop('label') + '</div>';
choices += $this.buildOptions($el);
choices += '</div>';
}
else {
var selected = $el.is('[selected]') ? ' selected' : '';
choices += '<div class="fs-option' + selected + '" data-value="' + $el.prop('value') + '"><span class="fs-checkbox"><i></i></span><div class="fs-option-label">' + $el.html() + '</div></div>';
}
});
return choices;
},
reloadDropdownLabel: function () {
var settings = this.settings;
var labelText = [];
this.$wrap.find('.fs-option.selected').each(function (i, el) {
labelText.push($(el).find('.fs-option-label').text());
});
if (labelText.length < 1) {
labelText = settings.placeholder;
}
else if (labelText.length > settings.numDisplayed) {
labelText = settings.overflowText.replace('{n}', labelText.length);
}
else {
labelText = labelText.join(', ');
}
this.$wrap.find('.fs-label').html(labelText);
this.$select.change();
}
}
/**
* Loop through each matching element
*/
return this.each(function () {
var data = $(this).data('fSelect');
if (!data) {
data = new fSelect(this, settings);
$(this).data('fSelect', data);
}
if (typeof settings == 'string') {
data[settings]();
}
});
}
/**
* Events
*/
window.fSelect = {
'active': null,
'idx': -1
};
function setIndexes($wrap) {
$wrap.find('.fs-option:not(.hidden)').each(function (i, el) {
$(el).attr('data-index', i);
$wrap.find('.fs-option').removeClass('hl');
});
$wrap.find('.fs-search input').focus();
window.fSelect.idx = -1;
}
function setScroll($wrap) {
var $container = $wrap.find('.fs-options');
var $selected = $wrap.find('.fs-option.hl');
var itemMin = $selected.offset().top + $container.scrollTop();
var itemMax = itemMin + $selected.outerHeight();
var containerMin = $container.offset().top + $container.scrollTop();
var containerMax = containerMin + $container.outerHeight();
if (itemMax > containerMax) { // scroll down
var to = $container.scrollTop() + itemMax - containerMax;
$container.scrollTop(to);
}
else if (itemMin < containerMin) { // scroll up
var to = $container.scrollTop() - containerMin - itemMin;
$container.scrollTop(to);
}
}
$(document).on('click', '.fs-option', function () {
var $wrap = $(this).closest('.fs-wrap');
if ($wrap.hasClass('multiple')) {
var selected = [];
$(this).toggleClass('selected');
$wrap.find('.fs-option.selected').each(function (i, el) {
selected.push($(el).attr('data-value'));
});
}
else {
var selected = $(this).attr('data-value');
$wrap.find('.fs-option').removeClass('selected');
$(this).addClass('selected');
$wrap.find('.fs-dropdown').hide();
}
$wrap.find('select').val(selected);
$wrap.find('select').fSelect('reloadDropdownLabel');
});
$(document).on('keyup', '.fs-search input', function (e) {
if (40 == e.which) {
$(this).blur();
return;
}
var $wrap = $(this).closest('.fs-wrap');
var keywords = $(this).val();
$wrap.find('.fs-option, .fs-optgroup-label').removeClass('hidden');
if ('' != keywords) {
$wrap.find('.fs-option').each(function () {
var regex = new RegExp(keywords, 'gi');
if (null === $(this).find('.fs-option-label').text().match(regex)) {
$(this).addClass('hidden');
}
});
$wrap.find('.fs-optgroup-label').each(function () {
var num_visible = $(this).closest('.fs-optgroup').find('.fs-option:not(.hidden)').length;
if (num_visible < 1) {
$(this).addClass('hidden');
}
});
}
setIndexes($wrap);
});
$(document).on('click', function (e) {
var $el = $(e.target);
var $wrap = $el.closest('.fs-wrap');
if (0 < $wrap.length) {
if ($el.hasClass('fs-label')) {
window.fSelect.active = $wrap;
var is_hidden = $wrap.find('.fs-dropdown').hasClass('hidden');
$('.fs-dropdown').addClass('hidden');
if (is_hidden) {
$wrap.find('.fs-dropdown').removeClass('hidden');
}
else {
$wrap.find('.fs-dropdown').addClass('hidden');
}
setIndexes($wrap);
}
}
else {
$('.fs-dropdown').addClass('hidden');
window.fSelect.active = null;
}
});
$(document).on('keydown', function (e) {
var $wrap = window.fSelect.active;
if (null === $wrap) {
return;
}
else if (38 == e.which) { // up
e.preventDefault();
$wrap.find('.fs-option').removeClass('hl');
if (window.fSelect.idx > 0) {
window.fSelect.idx--;
$wrap.find('.fs-option[data-index=' + window.fSelect.idx + ']').addClass('hl');
setScroll($wrap);
}
else {
window.fSelect.idx = -1;
$wrap.find('.fs-search input').focus();
}
}
else if (40 == e.which) { // down
e.preventDefault();
var last_index = $wrap.find('.fs-option:last').attr('data-index');
if (window.fSelect.idx < parseInt(last_index)) {
window.fSelect.idx++;
$wrap.find('.fs-option').removeClass('hl');
$wrap.find('.fs-option[data-index=' + window.fSelect.idx + ']').addClass('hl');
setScroll($wrap);
}
}
else if (32 == e.which || 13 == e.which) { // space, enter
$wrap.find('.fs-option.hl').click();
}
else if (27 == e.which) { // esc
$('.fs-dropdown').addClass('hidden');
window.fSelect.active = null;
}
});
})(jQuery);
</script>
</div>
</body>
</html>