select2 用js动态循环添加 没有任何渲染 只有第一个默认有渲染

Question

图片效果

只有第一行 正常显示 动态添加 select2 虽然初始化了但是没有任何渲染

js代码
获取后台数据的update页面

 function updateView(id, system_id) {
    $("#btntype").val(1);

    $("#Submit1").click(function() {
        add(1);

    });

    $
            .ajax({
                type : "POST",
                url : "/erzhentang/manage/forAjax.do?requestType=12.1",
                data : "id=" + id + "&system_id=" + system_id, // 发送到服务器的数据默认id是结论id
                success : function(msg) {
                    $("#xuewei_id").val("1,2,3").select2();
                    /* alert(msg); */
                    var json = eval('(' + msg + ')');
                    document.getElementById("addModel").style.display = "block";
                    document.getElementById("id1").value = json.earScanJielun.id;
                    document.getElementById("system_id1").value = json.earScanJielun.system_id;
                    /* 遍历所属系统下所有 耳穴频扫疾病项 */
                    var arrESJ = eval(json.listEarScanJibing);// arrESJ是一个数组
                    var checkESJ = document.getElementById("jibing_num1");
                    var str2 = "";
                    for (var j = 0; j < arrESJ.length; j++) {
                        str2 += "<option value=\"" + arrESJ[j].jibing_num
                                + "\">" + arrESJ[j].name + "</option>";
                        var checkESJ2 = arrESJ[j].name;
                        if (arrESJ[j].jibing_num == json.earScanJielun.jibing_num) {// 疾病编号人为控制每个编号都是唯一
                            arrESJ[j].name = "selected='selected'";
                        }
                        $("#jibing_num1").html(str2);
                    }
                    document.getElementById("jibing_num1").value = json.earScanJielun.jibing_num;
                    document.getElementById("jielun_rank1").value = json.earScanJielun.jielun_rank;
                    document.getElementById("jielun1").value = json.earScanJielun.jielun;
                    /* 下半截部分组合表动态展示修改和添加 */
                    var arrESC = eval(json.listEarScanCp);// arrESC是一个数组频扫结论组合表
                    var str = "";
                    var str1 = "";
                    for (var i = 0; i < arrESC.length; i++) {
                        str += "<tr>";
                        str += "<td colspan=\"8\">";
                        str += "<div style=\"margin-left: 148px;\" id=\"earScanCp\">";
                        str += "<div style=\"float: left;\">";
                        str += "<textarea style=\"width: 50px;margin-left: -86px;position: absolute;\" id=\"cp_id\" name=\"cp_id\" >"
                                + arrESC[i].id + "</textarea>";
                        str += "<select style=\"width: 60px;height: 36px;margin-left: 20px;\" id=\"gender\" name=\"gender\" >"
                        var myselect = document.getElementById("gender");// 这个获取的是静态jsp页面里标签


                        str += "<select style=\"width: 300px;margin-left:10px;\" id=\"xuewei_id\" name=\"xuewei_id\"class=\"combox\" multiple >"
                        str += "<optgroup label=\"小辈儿组\">";
                        str += "<option value=\"1\">心</option>";
                        str += "<option value=\"2\" " + "selected='selected'"
                                + ">" + "肺" + "</option>";
                        str += "<option value=\"3\" " + "selected='selected'"
                                + ">" + "小肠" + "</option>";
                        str += "<option value=\"4\">" + "口" + "</option>";
                        str += "<option value=\"5\">" + "食道" + "</option>";
                        str += "</optgroup>";

                        "</select>";


                        str += "</div>";
                        str += "<div >";
                        str += " <input type=\"button\" onclick=\"delRow(this,"
                                + arrESC[i].id
                                + ","
                                + arrESC[i].bianzhengId
                                + ")\" value=\"删除\" id=\"deleteESC\" name=\"deleteESC\" style=\"float: left; margin-left:10px; margin-top: 5px;\">";
                        str += "</div>";
                        str += "</div>";
                        str += "</td>";
                        str += "</tr>";
                        /* 替换静态页面 */
                        $("#tbody1").html(str);

                        select2Update();//执行select方法
                    }

                }
            });
}

动态循环添加行js部分

function addRow1() {
    var str = "";
    str += "<tr>";
    str += "<td colspan=\"8\">";
    str += "<div style=\"margin-left: 148px;\" id=\"earScanCp\">";
    str += "<div style=\"float: left;\">";
    str += "<textarea style=\"width: 50px;margin-left: -86px;position: absolute;\" id=\"cp_id\" name=\"cp_id\" ></textarea>";
    str += "<select style=\"width: 60px;height: 36px;margin-left: 20px;\" id=\"gender\" name=\"gender\" >"
    var myselect = document.getElementById("gender");// 这个获取的是静态jsp页面里标签
    for (var j = 0; j < myselect.options.length; j++) {// 下拉框是主家从静态页面获取并且遍历它
        str += "<option value=\"" + myselect.options[j].value + "\">"
                + myselect.options[j].text + "</option>";
    }
    "</select>";
    str += "<textarea style=\"width: 50px;margin-left: 10px;\" id=\"min_age\" name=\"min_age\" ></textarea>";
    str += "<textarea style=\"width: 50px;margin-left: 10px;\" id=\"max_age\" name=\"max_age\" ></textarea>";
    // str += "<textarea style=\"width: 300px;margin-left: 10px;\"
    // id=\"xuewei_id\" name=\"xuewei_id\" ></textarea>";
    str += "<select style=\"width: 300px;margin-left:10px;\" id=\"xuewei_id\" name=\"xuewei_id\" class=\"combox\" multiple >"
    str += "<optgroup label=\"小辈儿组\">";
    str += "<option value=\"1\">心</option>";
    str += "<option value=\"2\">" + "肺" + "</option>";
    str += "<option value=\"3\">" + "小肠" + "</option>";
    str += "<option value=\"4\">" + "口" + "</option>";
    str += "<option value=\"5\">" + "食道" + "</option>";
    str += "</optgroup>";
    "</select>";

    str += "<textarea style=\"width: 220px;margin-left: 10px;\" id=\"chuzhen_id\" name=\"chuzhen_id\" ></textarea>";
    str += "<select style=\"width: 60px;height: 36px;margin-left: 10px;\" id=\"bp\" name=\"bp\" >"
    var myselect1 = document.getElementById("bp");// 这个获取的是静态jsp页面里标签
    for (var k = 0; k < myselect1.options.length; k++) {// 下拉框是主家从静态页面获取并且遍历它
        // alert("j值：" + myselect1.options[k].value);
        // alert("text值：" + myselect1.options[k].text);
        str += "<option value=\"" + myselect1.options[k].value + "\">"
                + myselect1.options[k].text + "</option>";
    }
    "</select>";
    str += "<textarea style=\"width: 50px; height: 36px;margin-left: 10px;\" id=\"jielun_conform\" name=\"jielun_conform\"></textarea>";
    str += "</div>";
    str += "<div >";
    str += " <input type=\"button\" onclick=\"delRow(this)\" value=\"删除\" id=\"deleteESC\" name=\"deleteESC\" style=\"float: left; margin-left:10px; margin-top: 5px;\">";
    str += "</div>";
    str += "</div>";
    str += "</td>";
    str += "</tr>";
    $("#rowTable1").append(str);
    // $("select[name='xuewei_id']").select2({
//  $("#xuewei_id").select2().trigger();
     $("#xuewei_id").trigger('change')
    select2Save();
}

select2方法 包含添加和修改 目前两个方法完全一致

 function select2Update() {
     $("#xuewei_id").trigger('change')
    $(function() {
        $('#xuewei_id').select2({
            placeholder : "请至少选择一个人名",
            tags : true,
            createTag : function(decorated, params) {
                return null;
            },
            width : '256px'
        });

        function formatState(state) {
            if (!state.id) {
                return state.text;
            }
            var $state = $('<span>' + state.text + '</span>');
            return $state;
        }
        ;

        $('#sel_recommender').select2({
            placeholder : "请选择一个人名",
            templateResult : formatState,
            width : '256px'
        });
    });
}


function select2Save() {

    $(function() {
//       $("select[name='xuewei_id']").select2({
        $('#xuewei_id').select2({
            placeholder : "请至少选择一个人名",
            tags : true,
            createTag : function(decorated, params) {
                return null;
            },
            width : '256px'
        });

        function formatState(state) {
            if (!state.id) {
                return state.text;
            }
            var $state = $('<span>' + state.text + '</span>');
            return $state;
        }
        ;

        $('#sel_recommender').select2({
            placeholder : "请选择一个人名",
            templateResult : formatState,
            width : '256px'
        });
    });

Answer 1

id是唯一的，不建议一个页面有多个相同的id。虽然不会报错但有反规范，楼上兄弟做法可以解决，重复id最好还是不用id选择器，建议你用类选择器，除了老板的ie浏览，现在的新浏览器用类选择器性能低于id选择器而高于其它
选择器，比如属性选择器。给你个例子：

<div id="selectSection">
<select class="select2" name="xx1"/>
<select class="select2" name="xx1"/>
</div>

 $("#selectSection").find("select.select2").select2();
 或$("#selectSection select.select2").select2();
 或$("select.select2， #selectSection").select2();
 或$("select.select2").select2();