BootStrap与Select2使用小结

本文主要是介绍BootStrap与Select2使用小结，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！

这个select2组件的功能确实很强大，可以将图片放入到select里面随着文字一起显示。

组件的下载地址以及API说明地址：

1、Select2使用示例地址：https://select2.github.io/examples.html 、http://select2.github.io/select2/

2、Select2参数文档说明：https://select2.github.io/options.html

3、Select2源码：https://github.com/select2/select2

效果图：

HTML代码：

@{
 Layout = "~/Views/Shared/_Layout.cshtml";
}
<script src="/Content/jquery-3.1.1/jquery-3.1.1.min.js" type="text/javascript"></script>
<script src="/Content/bootstrap-3.3.0/js/bootstrap.min.js" type="text/javascript"></script>
<link href="/Content/bootstrap-3.3.0/css/bootstrap.min.css" rel="external nofollow" rel="stylesheet" type="text/css"/>
<script src="/Content/Select2_4.0.3/dist/js/select2.full.min.js" type="text/javascript"></script>
<link href="/Content/Select2_4.0.3/dist/css/select2.min.css" rel="external nofollow" rel="stylesheet" type="text/css" />
<script src="/Content/Select2_4.0.3/dist/js/i18n/zh-CN.js" type="text/javascript"></script>
<script src="/Content/jquery-placeholders-master/jquery.placeholders.min.js" type="text/javascript"></script>
@*<link href="http://select2.github.io/select2/bootstrap/css/bootstrap.css" rel="external nofollow" rel="stylesheet"/>
<link href="http://select2.github.io/font-awesome/css/font-awesome.min.css" rel="external nofollow" rel="stylesheet"/>
<link rel="stylesheet" href="http://fanyi.youdao.com/web2/styles/all-packed.css?572877" rel="external nofollow" type="text/css"/>
<script src="http://select2.github.io/js/jquery-1.7.1.min.js" type="text/javascript"></script>
<script src="http://select2.github.io/select2/bootstrap/js/bootstrap.min.js" type="text/javascript"></script>
<link href="http://select2.github.io/select2-3.5.3/select2.css?ts=2015-08-29T20%3A09%3A48%2B00%3A00" rel="external nofollow" rel="stylesheet"/>
<script src="http://select2.github.io/select2-3.5.3/select2.js?ts=2015-08-29T20%3A09%3A48%2B00%3A00" type="text/javascript"></script>*@
<script type="text/javascript">
 $(document).ready(function () {
  $("#test").select2();
  //--------------------------------------
  $("#test_1").select2({
   language: "zh-CN", //设置 提示语言
   width: "100%", //设置下拉框的宽度
   theme: "classic"
  });
  //------------------------------------------------------
  $("#test_2").select2({
   language: "zh-CN", //设置 提示语言
   width: "100%", //设置下拉框的宽度
   placeholder: "请选择",
   minimumInputLength: 10 //最小需要输入多少个字符才进行查询
  });
  //-------------------------------------------------------
  $("#test_3").select2({
   language: "zh-CN", //设置 提示语言
   width: "100%", //设置下拉框的宽度
   placeholder: "请选择",
   tags: true,
   maximumSelectionLength: 2 //设置最多可以选择多少项
  });
  //----------------------------------------------------
  $("#test_4").select2({
   language: "zh-CN", //设置 提示语言
   width: "100%", //设置下拉框的宽度
   placeholder: "请选择",
   allowClear: true,
   tags: true,
   maximumSelectionLength: 2, //设置最多可以选择多少项
   templateResult: function (state) {
   if (!state.id) {
     return state.text;
   }
    console.log(state.element.getAttribute("imgPath"));
    var $state = $('<span><img style="width: 30px;height: 20px;" src="' + state.element.getAttribute("imgPath") + '" class="img-flag" /> ' + state.text + '</span>');
    return $state;
   },
   templateSelection: function (state) {
    if (!state.id) return state.text; // optgroup
    var $state = $('<span><img style="width: 30px;height: 20px;" src="' + state.element.getAttribute("imgPath") + '" class="img-flag" /> ' + state.text + '</span>');
    return $state;
   }
  });
  //----------------------------------------------------------
  $("#test_5").select2({
   language: "zh-CN", //设置 提示语言
   width: "100%", //设置下拉框的宽度
   placeholder: "请选择",
    tags: true,
   maximumSelectionLength: 3, //设置最多可以选择多少项
   templateResult: function (state) {
    if (!state.id) {
     return state.text;
    }
    console.log(state.element.getAttribute("imgPath"));
    var $state = $('<span><img style="width: 30px;height: 20px;" src="' + state.element.getAttribute("imgPath") + '" class="img-flag" /> ' + state.text + '</span>');
    return $state;
   },
   templateSelection: function (state) {
    if (!state.id) return state.text; // optgroup
    var $state = $('<span><img style="width: 30px;height: 20px;" src="' + state.element.getAttribute("imgPath") + '" class="img-flag" /> ' + state.text + '</span>');
    return $state;
   }
  }).select2('val', ['HI', 'OR', 'NV']);
  //-------------------------------------------------------------------
  $("#test_6").select2({
   language: "zh-CN", //设置 提示语言
   width: "100%", //设置下拉框的宽度
   placeholder: "请选择",
   tags: true,
   maximumSelectionLength: 3, //设置最多可以选择多少项
   templateResult: function (state) {
    if (!state.id) {
     return state.text;
    }
    console.log(state.element.getAttribute("imgPath"));
    var $state = $('<span><img style="width: 30px;height: 20px;" src="' + state.element.getAttribute("imgPath") + '" class="img-flag" /> ' + state.text + '</span>');
    return $state;
   },
   templateSelection: function (state) {
    if (!state.id) return state.text; // optgroup
    var $state = $('<span><img style="width: 30px;height: 20px;" src="' + state.element.getAttribute("imgPath") + '" class="img-flag" /> ' + state.text + '</span>');
    return $state;
   }
  });
  //------------------------------------------------------------------
  $("#test_7").select2({
   ajax: {
    url: "Home/GetArea",
    dataType: 'json',
    delay: 250,
    data: function (params) {
     return {
      q: params.term, // search term
      page: params.page
     };
    },
    processResults: function (data, params) {
     params.page = params.page || 1;
     return {
      results: data.items,
      pagination: {
       more: (params.page * 30) < data.total_count
      }
     };
    },
    cache: true
   },
   escapeMarkup: function (markup) { return markup; }, // let our custom formatter work
   minimumInputLength: 1, 
   language: "zh-CN", //设置 提示语言
   maximumSelectionLength: 3, //设置最多可以选择多少项
   placeholder: "请选择",
   tags: false, //设置必须存在的选项 才能选中
   templateResult: function (repo) { //搜索到结果返回后执行，可以控制下拉选项的样式
    console.log("====================templateResult开始==================");
    console.log(repo);
    console.log("====================templateResult结束==================");
    if (repo.loading) return repo.text;
    var markup = "<div class=''>" + repo.text + "</div>";
    return markup;
   },
   templateSelection: function (repo) { //选中某一个选项是执行
    console.log("------------------templateSelection开始-------------------------------------");
    console.log( repo);
    console.log("------------------templateSelection结束-------------------------------------");
    return repo.full_name || repo.text;
   }
  });
  $("#btn").click(function() {
   alert($("#test_4").select2("val"));
  });
  //$("#test_5").prop("disabled", true); //设置是否可用
 });
 </script>
<article >
 默认
 <br/>
 <select style="width: 300px" id="test" class="form-control">
  <optgroup label="Alaskan/Hawaiian Time Zone">
   <option value="AK" imgPath="https://select2.github.io/vendor/images/flags/ak.png">Alaska</option>
   <option value="HI" imgPath="https://select2.github.io/vendor/images/flags/hi.png">Hawaii</option>
  </optgroup>
  <optgroup label="Pacific Time Zone">
   <option value="CA" imgPath="https://select2.github.io/vendor/images/flags/ca.png">California</option>
   <option value="NV" imgPath="https://select2.github.io/vendor/images/flags/nv.png">Nevada</option>
   <option value="OR" imgPath="https://select2.github.io/vendor/images/flags/or.png">Oregon</option>
   <option value="WA" imgPath="https://select2.github.io/vendor/images/flags/wa.png">Washington</option>
  </optgroup>
  <optgroup label="Mountain Time Zone">
   <option value="AZ" imgPath="https://select2.github.io/vendor/images/flags/az.png">Arizona</option>
   <option value="CO" imgPath="https://select2.github.io/vendor/images/flags/co.png">Colorado</option>
   <option value="ID" imgPath="https://select2.github.io/vendor/images/flags/id.png">Idaho</option>
   <option value="MT" imgPath="https://select2.github.io/vendor/images/flags/mt.png">Montana</option>
   <option value="NE" imgPath="https://select2.github.io/vendor/images/flags/ne.png">Nebraska</option>
   <option value="NM" imgPath="https://select2.github.io/vendor/images/flags/nm.png">New Mexico</option>
   <option value="ND" imgPath="https://select2.github.io/vendor/images/flags/nd.png">North Dakota</option>
   <option value="UT" imgPath="https://select2.github.io/vendor/images/flags/ut.png">Utah</option>
   <option value="WY" imgPath="https://select2.github.io/vendor/images/flags/wy.png">Wyoming</option>
  </optgroup>
  <optgroup label="Central Time Zone">
   <option value="AL">Alabama</option>
   <option value="AR">Arkansas</option>
   <option value="IL">Illinois</option>
   <option value="IA">Iowa</option>
   <option value="KS">Kansas</option>
   <option value="KY">Kentucky</option>
   <option value="LA">Louisiana</option>
   <option value="MN">Minnesota</option>
   <option value="MS">Mississippi</option>
   <option value="MO">Missouri</option>
   <option value="OK">Oklahoma</option>
   <option value="SD">South Dakota</option>
   <option value="TX">Texas</option>
   <option value="TN">Tennessee</option>
   <option value="WI">Wisconsin</option>
  </optgroup>
  <optgroup label="Eastern Time Zone">
   <option value="CT">Connecticut</option>
   <option value="DE">Delaware</option>
   <option value="FL">Florida</option>
   <option value="GA">Georgia</option>
   <option value="IN">Indiana</option>
   <option value="ME">Maine</option>
   <option value="MD">Maryland</option>
   <option value="MA">Massachusetts</option>
   <option value="MI">Michigan</option>
   <option value="NH">New Hampshire</option>
   <option value="NJ">New Jersey</option>
   <option value="NY">New York</option>
   <option value="NC">North Carolina</option>
   <option value="OH">Ohio</option>
   <option value="PA">Pennsylvania</option>
   <option value="RI">Rhode Island</option>
   <option value="SC">South Carolina</option>
   <option value="VT">Vermont</option>
   <option value="VA">Virginia</option>
   <option value="WV">West Virginia</option>
  </optgroup>
 </select>
 <br/>
 ----------------------------------------------------
 <br/>

1、可搜索选项

<select id="test_1" class="form-control">
  <optgroup label="Alaskan/Hawaiian Time Zone">
   <option value="AK" imgPath="https://select2.github.io/vendor/images/flags/ak.png">Alaska</option>
   <option value="HI" imgPath="https://select2.github.io/vendor/images/flags/hi.png">Hawaii</option>
  </optgroup>
  <optgroup label="Pacific Time Zone">
   <option value="CA" imgPath="https://select2.github.io/vendor/images/flags/ca.png">California</option>
   <option value="NV" imgPath="https://select2.github.io/vendor/images/flags/nv.png">Nevada</option>
   <option value="OR" imgPath="https://select2.github.io/vendor/images/flags/or.png">Oregon</option>
   <option value="WA" imgPath="https://select2.github.io/vendor/images/flags/wa.png">Washington</option>
  </optgroup>
  <optgroup label="Mountain Time Zone">
   <option value="AZ" imgPath="https://select2.github.io/vendor/images/flags/az.png">Arizona</option>
   <option value="CO" imgPath="https://select2.github.io/vendor/images/flags/co.png">Colorado</option>
   <option value="ID" imgPath="https://select2.github.io/vendor/images/flags/id.png">Idaho</option>
   <option value="MT" imgPath="https://select2.github.io/vendor/images/flags/mt.png">Montana</option>
   <option value="NE" imgPath="https://select2.github.io/vendor/images/flags/ne.png">Nebraska</option>
   <option value="NM" imgPath="https://select2.github.io/vendor/images/flags/nm.png">New Mexico</option>
   <option value="ND" imgPath="https://select2.github.io/vendor/images/flags/nd.png">North Dakota</option>
   <option value="UT" imgPath="https://select2.github.io/vendor/images/flags/ut.png">Utah</option>
   <option value="WY" imgPath="https://select2.github.io/vendor/images/flags/wy.png">Wyoming</option>
  </optgroup>
  <optgroup label="Central Time Zone">
   <option value="AL">Alabama</option>
   <option value="AR">Arkansas</option>
   <option value="IL">Illinois</option>
   <option value="IA">Iowa</option>
   <option value="KS">Kansas</option>
   <option value="KY">Kentucky</option>
   <option value="LA">Louisiana</option>
   <option value="MN">Minnesota</option>
   <option value="MS">Mississippi</option>
   <option value="MO">Missouri</option>
   <option value="OK">Oklahoma</option>
   <option value="SD">South Dakota</option>
   <option value="TX">Texas</option>
   <option value="TN">Tennessee</option>
   <option value="WI">Wisconsin</option>
  </optgroup>
  <optgroup label="Eastern Time Zone">
   <option value="CT">Connecticut</option>
   <option value="DE">Delaware</option>
   <option value="FL">Florida</option>
   <option value="GA">Georgia</option>
   <option value="IN">Indiana</option>
   <option value="ME">Maine</option>
   <option value="MD">Maryland</option>
   <option value="MA">Massachusetts</option>
   <option value="MI">Michigan</option>
   <option value="NH">New Hampshire</option>
   <option value="NJ">New Jersey</option>
   <option value="NY">New York</option>
   <option value="NC">North Carolina</option>
   <option value="OH">Ohio</option>
   <option value="PA">Pennsylvania</option>
   <option value="RI">Rhode Island</option>
   <option value="SC">South Carolina</option>
   <option value="VT">Vermont</option>
   <option value="VA">Virginia</option>
   <option value="WV">West Virginia</option>
  </optgroup>
 </select>
</article>
================================
<br/>

2、可搜索选项（有搜索关键字控制）

<article>
 <select id="test_2" class="form-control">
  <optgroup label="Alaskan/Hawaiian Time Zone">
   <option value="AK" imgPath="https://select2.github.io/vendor/images/flags/ak.png">Alaska</option>
   <option value="HI" imgPath="https://select2.github.io/vendor/images/flags/hi.png">Hawaii</option>
  </optgroup>
  <optgroup label="Pacific Time Zone">
   <option value="CA" imgPath="https://select2.github.io/vendor/images/flags/ca.png">California</option>
   <option value="NV" imgPath="https://select2.github.io/vendor/images/flags/nv.png">Nevada</option>
   <option value="OR" imgPath="https://select2.github.io/vendor/images/flags/or.png">Oregon</option>
   <option value="WA" imgPath="https://select2.github.io/vendor/images/flags/wa.png">Washington</option>
  </optgroup>
  <optgroup label="Mountain Time Zone">
   <option value="AZ" imgPath="https://select2.github.io/vendor/images/flags/az.png">Arizona</option>
   <option value="CO" imgPath="https://select2.github.io/vendor/images/flags/co.png">Colorado</option>
   <option value="ID" imgPath="https://select2.github.io/vendor/images/flags/id.png">Idaho</option>
   <option value="MT" imgPath="https://select2.github.io/vendor/images/flags/mt.png">Montana</option>
   <option value="NE" imgPath="https://select2.github.io/vendor/images/flags/ne.png">Nebraska</option>
   <option value="NM" imgPath="https://select2.github.io/vendor/images/flags/nm.png">New Mexico</option>
   <option value="ND" imgPath="https://select2.github.io/vendor/images/flags/nd.png">North Dakota</option>
   <option value="UT" imgPath="https://select2.github.io/vendor/images/flags/ut.png">Utah</option>
   <option value="WY" imgPath="https://select2.github.io/vendor/images/flags/wy.png">Wyoming</option>
  </optgroup>
  <optgroup label="Central Time Zone">
   <option value="AL">Alabama</option>
   <option value="AR">Arkansas</option>
   <option value="IL">Illinois</option>
   <option value="IA">Iowa</option>
   <option value="KS">Kansas</option>
   <option value="KY">Kentucky</option>
   <option value="LA">Louisiana</option>
   <option value="MN">Minnesota</option>
   <option value="MS">Mississippi</option>
   <option value="MO">Missouri</option>
   <option value="OK">Oklahoma</option>
   <option value="SD">South Dakota</option>
   <option value="TX">Texas</option>
   <option value="TN">Tennessee</option>
   <option value="WI">Wisconsin</option>
  </optgroup>
  <optgroup label="Eastern Time Zone">
   <option value="CT">Connecticut</option>
   <option value="DE">Delaware</option>
   <option value="FL">Florida</option>
   <option value="GA">Georgia</option>
   <option value="IN">Indiana</option>
   <option value="ME">Maine</option>
   <option value="MD">Maryland</option>
   <option value="MA">Massachusetts</option>
   <option value="MI">Michigan</option>
   <option value="NH">New Hampshire</option>
   <option value="NJ">New Jersey</option>
   <option value="NY">New York</option>
   <option value="NC">North Carolina</option>
   <option value="OH">Ohio</option>
   <option value="PA">Pennsylvania</option>
   <option value="RI">Rhode Island</option>
   <option value="SC">South Carolina</option>
   <option value="VT">Vermont</option>
   <option value="VA">Virginia</option>
   <option value="WV">West Virginia</option>
  </optgroup>
 </select>
</article>
===============================
<br/>

3、多选

<article>
 <select id="test_3" class="form-control js-example-placeholder-multiple js-states select2-hidden-accessible" multiple="multiple">
  <optgroup label="Alaskan/Hawaiian Time Zone">
   <option value="AK" imgPath="https://select2.github.io/vendor/images/flags/ak.png">Alaska</option>
   <option value="HI" imgPath="https://select2.github.io/vendor/images/flags/hi.png">Hawaii</option>
  </optgroup>
  <optgroup label="Pacific Time Zone">
   <option value="CA" imgPath="https://select2.github.io/vendor/images/flags/ca.png">California</option>
   <option value="NV" imgPath="https://select2.github.io/vendor/images/flags/nv.png">Nevada</option>
   <option value="OR" imgPath="https://select2.github.io/vendor/images/flags/or.png">Oregon</option>
   <option value="WA" imgPath="https://select2.github.io/vendor/images/flags/wa.png">Washington</option>
  </optgroup>
  <optgroup label="Mountain Time Zone">
   <option value="AZ" imgPath="https://select2.github.io/vendor/images/flags/az.png">Arizona</option>
   <option value="CO" imgPath="https://select2.github.io/vendor/images/flags/co.png">Colorado</option>
   <option value="ID" imgPath="https://select2.github.io/vendor/images/flags/id.png">Idaho</option>
   <option value="MT" imgPath="https://select2.github.io/vendor/images/flags/mt.png">Montana</option>
   <option value="NE" imgPath="https://select2.github.io/vendor/images/flags/ne.png">Nebraska</option>
   <option value="NM" imgPath="https://select2.github.io/vendor/images/flags/nm.png">New Mexico</option>
   <option value="ND" imgPath="https://select2.github.io/vendor/images/flags/nd.png">North Dakota</option>
   <option value="UT" imgPath="https://select2.github.io/vendor/images/flags/ut.png">Utah</option>
   <option value="WY" imgPath="https://select2.github.io/vendor/images/flags/wy.png">Wyoming</option>
  </optgroup>
  <optgroup label="Central Time Zone">
   <option value="AL">Alabama</option>
   <option value="AR">Arkansas</option>
   <option value="IL">Illinois</option>
   <option value="IA">Iowa</option>
   <option value="KS">Kansas</option>
   <option value="KY">Kentucky</option>
   <option value="LA">Louisiana</option>
   <option value="MN">Minnesota</option>
   <option value="MS">Mississippi</option>
   <option value="MO">Missouri</option>
   <option value="OK">Oklahoma</option>
   <option value="SD">South Dakota</option>
   <option value="TX">Texas</option>
   <option value="TN">Tennessee</option>
   <option value="WI">Wisconsin</option>
  </optgroup>
  <optgroup label="Eastern Time Zone">
   <option value="CT">Connecticut</option>
   <option value="DE">Delaware</option>
   <option value="FL">Florida</option>
   <option value="GA">Georgia</option>
   <option value="IN">Indiana</option>
   <option value="ME">Maine</option>
   <option value="MD">Maryland</option>
   <option value="MA">Massachusetts</option>
   <option value="MI">Michigan</option>
   <option value="NH">New Hampshire</option>
   <option value="NJ">New Jersey</option>
   <option value="NY">New York</option>
   <option value="NC">North Carolina</option>
   <option value="OH">Ohio</option>
   <option value="PA">Pennsylvania</option>
   <option value="RI">Rhode Island</option>
   <option value="SC">South Carolina</option>
   <option value="VT">Vermont</option>
   <option value="VA">Virginia</option>
   <option value="WV">West Virginia</option>
  </optgroup>
 </select>
</article>
===============================
<br/>

4、图文选项

<article>
 <select id="test_4" class="js-example-templating js-states form-control select2-hidden-accessible" multiple="multiple">
  <optgroup label="Alaskan/Hawaiian Time Zone">
   <option value="AK" imgPath="https://select2.github.io/vendor/images/flags/ak.png">Alaska</option>
   <option value="HI" imgPath="https://select2.github.io/vendor/images/flags/hi.png">Hawaii</option>
  </optgroup>
  <optgroup label="Pacific Time Zone">
   <option value="CA" imgPath="https://select2.github.io/vendor/images/flags/ca.png">California</option>
   <option value="NV" imgPath="https://select2.github.io/vendor/images/flags/nv.png">Nevada</option>
   <option value="OR" imgPath="https://select2.github.io/vendor/images/flags/or.png">Oregon</option>
   <option value="WA" imgPath="https://select2.github.io/vendor/images/flags/wa.png">Washington</option>
  </optgroup>
  <optgroup label="Mountain Time Zone">
   <option value="AZ" imgPath="https://select2.github.io/vendor/images/flags/az.png">Arizona</option>
   <option value="CO" imgPath="https://select2.github.io/vendor/images/flags/co.png">Colorado</option>
   <option value="ID" imgPath="https://select2.github.io/vendor/images/flags/id.png">Idaho</option>
   <option value="MT" imgPath="https://select2.github.io/vendor/images/flags/mt.png">Montana</option>
   <option value="NE" imgPath="https://select2.github.io/vendor/images/flags/ne.png">Nebraska</option>
   <option value="NM" imgPath="https://select2.github.io/vendor/images/flags/nm.png">New Mexico</option>
   <option value="ND" imgPath="https://select2.github.io/vendor/images/flags/nd.png">North Dakota</option>
   <option value="UT" imgPath="https://select2.github.io/vendor/images/flags/ut.png">Utah</option>
   <option value="WY" imgPath="https://select2.github.io/vendor/images/flags/wy.png">Wyoming</option>
  </optgroup>
  <optgroup label="Central Time Zone">
   <option value="AL">Alabama</option>
   <option value="AR">Arkansas</option>
   <option value="IL">Illinois</option>
   <option value="IA">Iowa</option>
   <option value="KS">Kansas</option>
   <option value="KY">Kentucky</option>
   <option value="LA">Louisiana</option>
   <option value="MN">Minnesota</option>
   <option value="MS">Mississippi</option>
   <option value="MO">Missouri</option>
   <option value="OK">Oklahoma</option>
   <option value="SD">South Dakota</option>
   <option value="TX">Texas</option>
   <option value="TN">Tennessee</option>
   <option value="WI">Wisconsin</option>
  </optgroup>
  <optgroup label="Eastern Time Zone">
   <option value="CT">Connecticut</option>
   <option value="DE">Delaware</option>
   <option value="FL">Florida</option>
   <option value="GA">Georgia</option>
   <option value="IN">Indiana</option>
   <option value="ME">Maine</option>
   <option value="MD">Maryland</option>
   <option value="MA">Massachusetts</option>
   <option value="MI">Michigan</option>
   <option value="NH">New Hampshire</option>
   <option value="NJ">New Jersey</option>
   <option value="NY">New York</option>
   <option value="NC">North Carolina</option>
   <option value="OH">Ohio</option>
   <option value="PA">Pennsylvania</option>
   <option value="RI">Rhode Island</option>
   <option value="SC">South Carolina</option>
   <option value="VT">Vermont</option>
   <option value="VA">Virginia</option>
   <option value="WV">West Virginia</option>
  </optgroup>
 </select>
</article>
<br/>
======================================
<br/>

5、默认选中某个选项

<article>
 <select id="test_5" class="form-control" multiple="multiple">
  <optgroup label="Alaskan/Hawaiian Time Zone">
   <option value="AK" imgPath="https://select2.github.io/vendor/images/flags/ak.png">Alaska</option>
   <option value="HI" imgPath="https://select2.github.io/vendor/images/flags/hi.png">Hawaii</option>
  </optgroup>
  <optgroup label="Pacific Time Zone">
   <option value="CA" imgPath="https://select2.github.io/vendor/images/flags/ca.png">California</option>
   <option value="NV" imgPath="https://select2.github.io/vendor/images/flags/nv.png">Nevada</option>
   <option value="OR" imgPath="https://select2.github.io/vendor/images/flags/or.png">Oregon</option>
   <option value="WA" imgPath="https://select2.github.io/vendor/images/flags/wa.png">Washington</option>
  </optgroup>
  <optgroup label="Mountain Time Zone">
   <option value="AZ" imgPath="https://select2.github.io/vendor/images/flags/az.png">Arizona</option>
   <option value="CO" imgPath="https://select2.github.io/vendor/images/flags/co.png">Colorado</option>
   <option value="ID" imgPath="https://select2.github.io/vendor/images/flags/id.png">Idaho</option>
   <option value="MT" imgPath="https://select2.github.io/vendor/images/flags/mt.png">Montana</option>
   <option value="NE" imgPath="https://select2.github.io/vendor/images/flags/ne.png">Nebraska</option>
   <option value="NM" imgPath="https://select2.github.io/vendor/images/flags/nm.png">New Mexico</option>
   <option value="ND" imgPath="https://select2.github.io/vendor/images/flags/nd.png">North Dakota</option>
   <option value="UT" imgPath="https://select2.github.io/vendor/images/flags/ut.png">Utah</option>
   <option value="WY" imgPath="https://select2.github.io/vendor/images/flags/wy.png">Wyoming</option>
  </optgroup>
  <optgroup label="Central Time Zone">
   <option value="AL">Alabama</option>
   <option value="AR">Arkansas</option>
   <option value="IL">Illinois</option>
   <option value="IA">Iowa</option>
   <option value="KS">Kansas</option>
   <option value="KY">Kentucky</option>
   <option value="LA">Louisiana</option>
   <option value="MN">Minnesota</option>
   <option value="MS">Mississippi</option>
   <option value="MO">Missouri</option>
   <option value="OK">Oklahoma</option>
   <option value="SD">South Dakota</option>
   <option value="TX">Texas</option>
   <option value="TN">Tennessee</option>
   <option value="WI">Wisconsin</option>
  </optgroup>
  <optgroup label="Eastern Time Zone">
   <option value="CT">Connecticut</option>
   <option value="DE">Delaware</option>
   <option value="FL">Florida</option>
   <option value="GA">Georgia</option>
   <option value="IN">Indiana</option>
   <option value="ME">Maine</option>
   <option value="MD">Maryland</option>
   <option value="MA">Massachusetts</option>
   <option value="MI">Michigan</option>
   <option value="NH">New Hampshire</option>
   <option value="NJ">New Jersey</option>
   <option value="NY">New York</option>
   <option value="NC">North Carolina</option>
   <option value="OH">Ohio</option>
   <option value="PA">Pennsylvania</option>
   <option value="RI">Rhode Island</option>
   <option value="SC">South Carolina</option>
   <option value="VT">Vermont</option>
   <option value="VA">Virginia</option>
   <option value="WV">West Virginia</option>
  </optgroup>
 </select>
</article>
<br/>
=========================================
<br/>

6、某些选项不能选中

<select id="test_6" class="form-control">
 <optgroup label="Alaskan/Hawaiian Time Zone">
  <option value="AK" imgPath="https://select2.github.io/vendor/images/flags/ak.png">Alaska</option>
  <option value="HI" imgPath="https://select2.github.io/vendor/images/flags/hi.png">Hawaii</option>
 </optgroup>
 <optgroup label="Pacific Time Zone">
  <option value="CA" disabled="disabled" imgPath="https://select2.github.io/vendor/images/flags/ca.png">California</option>
  <option value="NV" imgPath="https://select2.github.io/vendor/images/flags/nv.png">Nevada</option>
  <option value="OR" imgPath="https://select2.github.io/vendor/images/flags/or.png">Oregon</option>
  <option value="WA" disabled="disabled" imgPath="https://select2.github.io/vendor/images/flags/wa.png">Washington</option>
 </optgroup>
 <optgroup label="Mountain Time Zone">
  <option value="AZ" imgPath="https://select2.github.io/vendor/images/flags/az.png">Arizona</option>
  <option value="CO" imgPath="https://select2.github.io/vendor/images/flags/co.png">Colorado</option>
  <option value="ID" imgPath="https://select2.github.io/vendor/images/flags/id.png">Idaho</option>
  <option value="MT" imgPath="https://select2.github.io/vendor/images/flags/mt.png">Montana</option>
  <option value="NE" imgPath="https://select2.github.io/vendor/images/flags/ne.png">Nebraska</option>
  <option value="NM" imgPath="https://select2.github.io/vendor/images/flags/nm.png">New Mexico</option>
  <option value="ND" imgPath="https://select2.github.io/vendor/images/flags/nd.png">North Dakota</option>
  <option value="UT" imgPath="https://select2.github.io/vendor/images/flags/ut.png">Utah</option>
  <option value="WY" imgPath="https://select2.github.io/vendor/images/flags/wy.png">Wyoming</option>
 </optgroup>
 <optgroup label="Central Time Zone">
  <option value="AL">Alabama</option>
  <option value="AR">Arkansas</option>
  <option value="IL">Illinois</option>
  <option value="IA">Iowa</option>
  <option value="KS">Kansas</option>
  <option value="KY">Kentucky</option>
  <option value="LA">Louisiana</option>
  <option value="MN">Minnesota</option>
  <option value="MS">Mississippi</option>
  <option value="MO">Missouri</option>
  <option value="OK">Oklahoma</option>
  <option value="SD">South Dakota</option>
  <option value="TX">Texas</option>
  <option value="TN">Tennessee</option>
  <option value="WI">Wisconsin</option>
 </optgroup>
 <optgroup label="Eastern Time Zone">
  <option value="CT">Connecticut</option>
  <option value="DE">Delaware</option>
  <option value="FL">Florida</option>
  <option value="GA">Georgia</option>
  <option value="IN">Indiana</option>
  <option value="ME">Maine</option>
  <option value="MD">Maryland</option>
  <option value="MA">Massachusetts</option>
  <option value="MI">Michigan</option>
  <option value="NH">New Hampshire</option>
  <option value="NJ">New Jersey</option>
  <option value="NY">New York</option>
  <option value="NC">North Carolina</option>
  <option value="OH">Ohio</option>
  <option value="PA">Pennsylvania</option>
  <option value="RI">Rhode Island</option>
  <option value="SC">South Carolina</option>
  <option value="VT">Vermont</option>
  <option value="VA">Virginia</option>
  <option value="WV">West Virginia</option>
 </optgroup>
</select>
<br/>
======================================
<br/>

7、搜索动态加载下拉选项功能（即在用户输入搜索内容时动态去后台取数据）

<article>
 <select id="test_7" class=" form-control " multiple="multiple">
 </select>
</article>
<br/>
=========================================
<button id="btn">获取选中的值</button>

控制器action代码：

public class HomeController : Controller
 {
  public IEnumerable<string> areaList = new List<string>()
  { 
   "北京市", 
   "天津市",
   "重庆市",
   "上海市",
   "广州市", 
   "长沙", 
   "哈尔滨", 
   "长春",
   "杭州市", 
   "南京市",
   "福建市",
   "河北省", 
   "山西省", 
   "辽宁省", 
   "吉林省", 
   "黑龙江省",
   "江苏省",
   "浙江省", 
   "安徽省", 
   "福建省", 
   "江西省", 
   "山东省", 
   "河南省",
   "湖北省", 
   "湖南省",
   "广东省", 
   "海南省", 
   "四川省",
   "贵州省", 
   "云南省", 
   "陕西省", 
   "甘肃省",
   "青海省",
   "台湾省",
   "内蒙古自治区", 
   "广西壮族自治区", 
   "西藏自治区", 
   "宁夏回族自治区",
   "新疆维吾尔自治区", 
   "香港特别行政区", 
   "澳门特别行政区" 
  };
  public JsonResult GetArea(string q, string page)
  {
   var area = new { id = 1, name = "" };
   var lstRes = areaList.Select((t, i) => new Area
   {
    id = i,
    text = t,
    element = "element" + i
   });
   if (!string.IsNullOrEmpty(q.Trim()))
   {
    lstRes = lstRes.Where(x => x.text.Contains(q));
   }
   var lstCurPageRes = string.IsNullOrEmpty(page) ? lstRes.Take(10) : lstRes.Skip(Convert.ToInt32(page) * 10 - 10).Take(10);
   return Json(new { items = lstCurPageRes, total_count = lstRes.Count() }, JsonRequestBehavior.AllowGet);
  }
  public ActionResult Index()
  {
   return View();
  }
 }
namespace Select2Demo.Models
{
 public class Area
 {
  public int id { get; set; }
  public string text { get; set; }
  public string element { get; set; }
 }
}

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