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bootstrap与Select2使用小结

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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：

bootstrap与Select2使用小结

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="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="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="stylesheet"/>
<link href="http://select2.github.io/font-awesome/css/font-awesome.min.css" rel="stylesheet"/>
<link rel="stylesheet" href="http://fanyi.youdao.com/web2/styles/all-packed.css?572877" 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="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  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  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  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  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  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  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   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  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  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  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  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  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  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  class=" form-control " multiple="multiple">
       
    </select>
</article>
<br/>
=========================================

<button >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; }
    }
}

详细demo下载地址： http://pan.baidu.com/s/1qYvpzo4 密码：yvag

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