js+css实现select的美化效果

先给大家看一看美化之后的效果图：

CSS：

.div-select-text
{
float: left;
background-color: #fff;
height: 100%;
word-break: keep-all;
overflow: hidden;
cursor: default;
}

.div-select-text > div
{
padding: 3px;
line-height: 34px;
}

.div-select-arrow
{
background-color: #fff;
float: right;
width: 40px;
height: 100%;
color: #999;
cursor: default;
}

.div-select-arrow > div
{
border: solid 1px #999;
margin: 2px;
height: 34px;
background-color: #f2f2f2;
text-align: center;
line-height: 34px;
font-size: 22px;
}

.div-select-list
{
position: absolute;
float: left;
top: 100px;
left: 100px;
border: solid 1px #999;
max-height: 300px;
overflow: auto;
background-color: #9f9;
display: none;
z-index: 9100;
}

.div-select-list .div-select-item:nth-child(2n+1)
{
background-color: #fff;
}

.div-select-item
{
height: 50px;
line-height: 50px;
padding-left: 3px;
padding-right: 3px;
background-color: #f2f2f2;
word-break: keep-all;
overflow: hidden;
cursor: default;
}

.div-select-item-hover
{
background-color: #3399ff!important;
}

.div-select-selected
{
background-color: #3399ff !important;
}

JS：

rush:js;"> //select美化 var divSelectListIndex = 0;

$(function () {
initDivSelect();
});

//初始化select美化插件
function initDivSelect() {
$(".div-select-target").each(function () {
divSelectListIndex++;
var select = $(this);

if (select.css("<a href="https://www.jb51.cc/tag/dis/" target="_blank" class="keywords">dis</a>play") == "none") {
  return;
}
else {
  select.css("<a href="https://www.jb51.cc/tag/dis/" target="_blank" class="keywords">dis</a>play","none")
}

if (select.next("div").find(".div-select-list").length == 0) {
  select.after('<div><div class="div-select"&gt;<div class="div-select-text"&gt;<div></div></div><div class="div-select-arrow"&gt;<div>∨</div></div></div></div>');
  $("body").append('<div class="div-select-list div-select-list-' + divSelectListIndex + '"&gt;</div>');
}

var div = select.next("div");
var divText = div.find(".div-select-text");
var divSelect = div.find(".div-select");
var divArrow = div.find(".div-select-arrow");
var list = $(".div-select-list-" + divSelectListIndex);

function updateText(item) {
  divText.find("div").html(item.html());
}

select.find("option").each(function () {
  var option = $(this);
  var text = option.html();
  var value = option.attr("value");
  list.append('<div class="div-select-item" value="' + value + '"&gt;' + text + '</div>');
  list.find(".div-select-item:last").click(function () {
    var item = $(this);
    var value = item.attr("value");
    select.val(value);
    select.change();
    list.find(".div-select-selected").removeClass("div-select-selected");
    item.addClass("div-select-selected");
    updateText(item);
    list.hide();
  });

  list.find(".div-select-item:last").mouseenter(function () {
    var item = $(this);
    var selectedMark = list.find(".div-select-selected");
    selectedMark.removeClass("div-select-selected");
    selectedMark.addClass("div-select-selected-mark");
    list.find(".div-select-item-hover").removeClass("div-select-item-hover");
    item.addClass("div-select-item-hover");
    updateText(item);
  });
});

list.mouseleave(function () {
  var selectedMark = list.find(".div-select-selected-mark");
  if (list.find(".div-select-selected").length == 0) {
    selectedMark.addClass("div-select-selected");
    updateText(selectedMark);
  }
  selectedMark.removeClass("div-select-selected-mark");
  list.find(".div-select-item-hover").removeClass("div-select-item-hover");
});

if (select.attr("width")) {
  divSelect.width(select.attr("width") - 2);
  divText.width(divSelect.width() - divArrow.width());
  if (select.attr("width") > list.width()) {
    list.width(divSelect.width());
  }
}

div.keydown(function (e) {
  list.find(".div-select-selected-mark").removeClass("div-select-selected-mark");
  list.find(".div-select-item-hover").addClass("div-select-selected");
  list.find(".div-select-item-hover").removeClass("div-select-item-hover");
  if (e.keyCode == 40) {
    var currentSelected = list.find(".div-select-selected");
    var nextSelected = currentSelected.next(".div-select-item");
    if (nextSelected.length == 0) {
      nextSelected = list.find(".div-select-item:f<a href="https://www.jb51.cc/tag/irs/" target="_blank" class="keywords">irs</a>t");
      nextSelected.addClass("div-select-selected");
      currentSelected.removeClass("div-select-selected");
      list.scrollTop(0);
    } else {
      nextSelected.addClass("div-select-selected");
      currentSelected.removeClass("div-select-selected");
      var i = 0;
      while (nextSelected.position().top < 0
        || nextSelected.position().top > list.height() - nextSelected.height()) {
        list.scrollTop(list.scrollTop() + nextSelected.height());
        if (i++ > 100) break;
      }
    }
    updateText(nextSelected);
    return false;
  }
  if (e.keyCode == 38) {
    var currentSelected = list.find(".div-select-selected");
    var nextSelected = currentSelected.prev(".div-select-item");
    if (nextSelected.length == 0) {
      nextSelected = list.find(".div-select-item:last");
      nextSelected.addClass("div-select-selected");
      currentSelected.removeClass("div-select-selected");
      list.scrollTop(list.find(".div-select-item").length * nextSelected.height());
    }
    else {
      nextSelected.addClass("div-select-selected");
      currentSelected.removeClass("div-select-selected");
      var i = 0;
      while (nextSelected.position().top < 0
        || nextSelected.position().top > list.height() - nextSelected.height()) {
        list.scrollTop(list.scrollTop() - nextSelected.height());
        if (i++ > 100) break;
      }
    }
    updateText(nextSelected);
    return false;
  }
  if (e.keyCode == 13) {
    var selectedItem = list.find(".div-select-selected");
    var value = selectedItem.attr("value");
    select.val(value);
    list.hide();
    select.change();
  }
});

divSelect.click(function () {
  $("a").bind("click",function () {
    $("a").unbind("click");
    list.hide();
  });

  if (list.css("<a href="https://www.jb51.cc/tag/dis/" target="_blank" class="keywords">dis</a>play") == "none") {
    list.show();
  }
  else {
    list.hide();
  }

  list.css("top",divSelect.offset().top + divSelect.height() + 1);
  list.css("left",divSelect.offset().left);
  if ($(window).scrollTop() + $(window).height() < list.offset().top + list.height() + 2) {
    list.css("top",$(window).scrollTop() + $(window).height() - list.height() - 2);
  }
  if (list.width() < divSelect.width()) {
    list.width(divSelect.width());
  }

  var currentSelected = list.find(".div-select-selected");
  if (currentSelected.position().top > list.height() - currentSelected.height()) {
    list.scrollTop(currentSelected.position().top - currentSelected.height() * 2);
  }
  return false;
});

$("html,body").bind("click",function () {
  list.hide();
});
list.click(function () {
  return false;
});

function initSelect() {
  list.find(".div-select-selected").removeClass("div-select-selected");
  var matchItem = list.find(".div-select-item[value='" + select.val() + "']");
  if (matchItem.length > 0) {
    matchItem.addClass("div-select-selected");
    updateText(matchItem);
  }
}
initSelect();
select.change(function () {
  initSelect();
});

}); // $(".div-select-target").each
}

2、如何使用：

第1步、引用CSS和JS：

rush:xhtml;">

第2步、给select控件加上class="div-select-target" width="200"，其中class="div-select-target"是必须的，width="200"是可选的。完整HTML代码如下：

rush:xhtml;">

<div style="border: solid 1px #f99; margin: 50px; padding: 50px;">

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ottom: 700px;">