How to add images in select list?

Answer 1

You already have several answers that suggest using JavaScript/jQuery. I am going to add an alternative that only uses HTML and CSS without any JS.

The basic idea is to use a set of radio buttons and labels (that will activate/deactivate the radio buttons), and with CSS control that only the label associated to the selected radio button will be displayed. If you want to allow selecting multiple values, you could achieve it by using checkboxes instead of radio buttons.

Here is an example. The code may be a bit messier (specially compared to the other solutions):

.select-sim {
  width:200px;
  height:22px;
  line-height:22px;
  vertical-align:middle;
  position:relative;
  background:white;
  border:1px solid #ccc;
  overflow:hidden;
}

.select-sim::after {
  content:"▼";
  font-size:0.5em;
  font-family:arial;
  position:absolute;
  top:50%;
  right:5px;
  transform:translate(0, -50%);
}

.select-sim:hover::after {
  content:"";
}

.select-sim:hover {
  overflow:visible;
}

.select-sim:hover .options .option label {
  display:inline-block;
}

.select-sim:hover .options {
  background:white;
  border:1px solid #ccc;
  position:absolute;
  top:-1px;
  left:-1px;
  width:100%;
  height:88px;
  overflow-y:scroll;
}

.select-sim .options .option {
  overflow:hidden;
}

.select-sim:hover .options .option {
  height:22px;
  overflow:hidden;
}

.select-sim .options .option img {
  vertical-align:middle;
}

.select-sim .options .option label {
  display:none;
}

.select-sim .options .option input {
  width:0;
  height:0;
  overflow:hidden;
  margin:0;
  padding:0;
  float:left;
  display:inline-block;
  /* fix specific for Firefox */
  position: absolute;
  left: -10000px;
}

.select-sim .options .option input:checked + label {
  display:block;
  width:100%;
}

.select-sim:hover .options .option input + label {
  display:block;
}

.select-sim:hover .options .option input:checked + label {
  background:#fffff0;
}