<div id="dd" class="wrapper-dropdown-4">To do
<ul class="dropdown">
<li><input type="checkbox" id="el-1" name="el-1" value="donut"><label for="el-1">Eat a donut</label></li>
<li><input type="checkbox" id="el-2" name="el-2" value="neighbour"><label for="el-2">Spy on my neighbours</label></li>
<li><input type="checkbox" id="el-3" name="el-3" value="T-rex"><label for="el-3">Feed my T-Rex</label></li>
</ul>
</div>
@import "compass/css3";
*,*:after,*:before {
box-sizing: border-box;
}
body {
font-family: 'Lato', 'Arial', sans-serif;
background: #DDD url(https://tympanus.net/Tutorials/CustomDropDownListStyling/images/bg.jpg);
font-weight: 300;
font-size: 15px;
color: #333;
-webkit-font-smoothing: antialiased;
overflow-y: scroll;
overflow-x: hidden;
}
.wrapper-dropdown-4 {
/* Size and position */
position: relative;
width: 270px;
margin: 40px auto;
padding: 10px 10px 10px 30px;
/* Styles */
background: #fff;
border: 1px solid silver;
cursor: pointer;
outline: none;
}
.wrapper-dropdown-4:after {
content: "";
width: 0;
height: 0;
position: absolute;
right: 14px;
top: 50%;
margin-top: -3px;
border-width: 6px 6px 0 6px;
border-style: solid;
border-color: #ffaa9f transparent;
}
.wrapper-dropdown-4 .dropdown {
/* Size & position */
position: absolute;
top: 100%;
margin-top: 1px;
left: -1px;
right: -1px;
/* Styles */
background: white;
border: inherit;
border-top: none;
list-style: none;
-webkit-transition: all 0.3s ease-out;
-moz-transition: all 0.3s ease-out;
-ms-transition: all 0.3s ease-out;
-o-transition: all 0.3s ease-out;
transition: all 0.3s ease-out;
/* Hiding */
opacity: 0;
pointer-events: none;
}
/* Red lines: the pseudo-elements way */
.wrapper-dropdown-4 .dropdown:before,
.wrapper-dropdown-4:before {
content: "";
width: 4px;
height: 100%;
position: absolute;
top: 0;
left: 15px;
border: 1px solid #ffaa9f;
border-top: none;
border-bottom: none;
z-index: 2;
}
/* Red lines: the gradients way */
/*
.wrapper-dropdown-4 .dropdown,
.wrapper-dropdown-4 {
background: linear-gradient(left, white 5%, #ffaa9f 5%, #ffaa9f 5.3%, white 5.3%, white 6.5%, #ffaa9f 6.5%, #ffaa9f 6.8%, white 6.8%);
}
.wrapper-dropdown-4 .dropdown li:hover label {
background: linear-gradient(left, #f0F0F0 5%, #ffaa9f 5%, #ffaa9f 5.3%, #f0F0F0 5.3%, #f0F0F0 6.5%, #ffaa9f 6.5%, #ffaa9f 6.8%, #f0F0F0 6.8%);
}
*/
.wrapper-dropdown-4 .dropdown li {
position: relative; /* Enable absolute positioning for checkboxes */
}
.wrapper-dropdown-4 .dropdown li label {
display: block;
padding: 10px 10px 10px 30px; /* Same padding as the button */
border-bottom: 1px dotted #1ccfcf;
-webkit-transition: all 0.3s ease-out;
-moz-transition: all 0.3s ease-out;
-ms-transition: all 0.3s ease-out;
-o-transition: all 0.3s ease-out;
transition: all 0.3s ease-out;
}
.wrapper-dropdown-4 .dropdown li:last-of-type label {
border: none;
}
.wrapper-dropdown-4 .dropdown li input /* Checkboxes */ {
position: absolute;
display: block;
right: 10px;
top: 50%;
margin-top: -8px;
}
/* Hover state */
.wrapper-dropdown-4 .dropdown li:hover label {
background: #f0f0f0;
}
/* Checked state */
.wrapper-dropdown-4 .dropdown li input:checked ~ label {
color: grey;
text-decoration: line-through;
}
/* Active state */
.wrapper-dropdown-4.active:after {
border-width: 0 6px 6px 6px;
}
.wrapper-dropdown-4.active .dropdown {
opacity: 1;
pointer-events: auto;
}
View Compiled
function DropDown(el) {
this.dd = el;
this.opts = this.dd.find('ul.dropdown > li');
this.val = [];
this.index = [];
this.initEvents();
}
DropDown.prototype = {
initEvents : function() {
var obj = this;
obj.dd.on('click', function(event){
$(this).toggleClass('active');
event.stopPropagation();
});
obj.opts.children('label').on('click',function(event){
var opt = $(this).parent(),
chbox = opt.children('input'),
val = chbox.val(),
idx = opt.index();
($.inArray(val, obj.val) !== -1) ? obj.val.splice( $.inArray(val, obj.val), 1 ) : obj.val.push( val );
($.inArray(idx, obj.index) !== -1) ? obj.index.splice( $.inArray(idx, obj.index), 1 ) : obj.index.push( idx );
});
},
getValue : function() {
return this.val;
},
getIndex : function() {
return this.index;
}
}
$(function() {
var dd = new DropDown( $('#dd') );
$(document).click(function() {
// all dropdowns
$('.wrapper-dropdown-4').removeClass('active');
});
});
This Pen doesn't use any external CSS resources.