方案一：layui下拉框分页插件

https://fly.layui.com/jie/29002/

此插件我用了下浏览器缓存有问题，而且当下拉框数据量过万后，会一直渲染不出来，期待后期作者优化

如图下拉框效果：

引入js和css

 <script src="${contextPath}/static/selectPage/js/utils.js" type="text/javascript" charset="utf-8"></script>

 <script src="${contextPath}/static/selectPage/js/selectPageTool.js" type="text/javascript" charset="utf-8"></script>

 <link rel="stylesheet" href="${contextPath}/static/selectPage/css/cyType.css" media="all">

 <link rel="stylesheet" href="${contextPath}/static/selectPage/css/cyStyle.css" media="all">

 <link rel="stylesheet" href="${contextPath}/static/selectPage/css/font-awesome.min.css" media="all">

<link rel="stylesheet" href="${contextPath}/static/layui/css/layui.css">

<script src="${contextPath}/static/lib/jquery.js"></script>

<script src="${contextPath}/static/layui/layui.js"></script>

<body>

    <form class="layui-form">

    <input type="hidden" id="code" name="code" value="${materielEntity.code}">

       <div class="layui-form-item">

        <label class="layui-form-label">下拉框</label>

        <div class="layui-input-block" style="width:80%">
　　　　　　　　//layui原生下拉框支撑不了大数据

           <%--  <select name="cardCode" lay-filter="" lay-search>

                <option value="">请选择</option>

                 <c:forEach items="${sapSuppliers}" var="sapSupplier">

                    <option value="${sapSupplier.cardCode}" <c:if test='${materielEntity.cardCode == sapSupplier.cardCode}'>selected="selected"</c:if> >${sapSupplier.cardCode}</option>

                  </c:forEach>

              </select> --%>

　　　　　　　　//这个是下拉框分页的样式，这个插件也是有问题滴，看着用

              <div style="margin-top:4%" cyType="selectPageTool" cyProps="url:'/sapSupplier/findAllSupplier',cache:false, checkbox:'false',tips:'请选择'"

                 name="cardCode" value="${materielEntity.cardCode}" class="layui-input-normal">

            </div>

        </div>

    </div>

    <div class="layui-form-item">

        <div class="layui-input-block">

            <button class="layui-btn" lay-submit lay-filter="Form">保存</button>

            <button type="reset" class="layui-btn layui-btn-primary">重置</button>

        </div>

    </div>

</form>

</body>

　　　　<div style="margin-top:4%" cyType="selectPageTool" cyProps="url:'/sapSupplier/findAllSupplier',cache:false, checkbox:'false',tips:'请选择'"

                 name="cardCode" value="${materielEntity.cardCode}" class="layui-input-normal">

            </div> 
　　　　1.name 填你需要渲染的字段，新增和编辑重新渲染都是靠这个name
　　　　2. value 渲染的code
　　　　3.url和平常我们写ajax访问的后台接口一样

//url后台接口

    @RequestMapping(value = "findAllSupplier")

    Map<String, Object> findAllSupplier() {

        Map<String, Object> map = new HashMap<>();

　　　　　//数据库对应的实体集合

        List<SapSupplier> sapSuppliers = sapSupplierService.findAll();

        //我们需要返回前端的json实体集合

        List<SelectPageJson> selectPageJsons = new ArrayList<>();

        if(sapSuppliers != null && sapSuppliers.size() > 0) {

            for(SapSupplier sapSupplier : sapSuppliers) {

                SelectPageJson selectPageJson = new SelectPageJson();

                selectPageJson.setCode(sapSupplier.getCardCode());

                selectPageJson.setValue(sapSupplier.getCardName());

                selectPageJsons.add(selectPageJson);

            }

        }

        map.put("code", 0);

        map.put("data", selectPageJsons);

        map.put("count", selectPageJsons.size());

        map.put("msg", "成功");

        return map;

    }
　　返回的数据格式类似这样：

{
"code": 0,
"msg": "",
"count": 16,
"data": [//SelectPageJson 集合

　code:"",

　value:"";

]
}

/**

* @Description: layui 分页下拉框插件json格式

* @date: 2019年4月19日 下午5:28:16

*/

public class SelectPageJson {

    private String code;

    private String value;

    public String getCode() {

        return code;

    }

    public void setCode(String code) {

        this.code = code;

    }

    public String getValue() {

        return value;

    }

    public void setValue(String value) {

        this.value = value;

    }

}

关键字搜索的jpa对应的sql

/**
* @Description: CardName模糊查询
* @date: 2019年4月26日上午11:49:20
*/
@Query(value="SELECT card_code FROM sap_supplier s WHERE LOCATE(?1, s.card_name)>0 and s.delete_mark = false ORDER BY s.create_date",nativeQuery=true)
List<String> findListByCardName(String cardName);

LOCATE(?1, s.card_name)>0 模糊查询

方案二：下拉框嵌入分页表格，

tableSelect 下拉表格选择器

https://fly.layui.com/extend/tableSelect/#doc

<body>

    <form class="layui-form">

    <input type="hidden" id="code" name="code" value="${salesOrder.code}">

       <div class="layui-form-item">

        <label class="layui-form-label">客户/供应商</label>

        <div class="layui-input-block" style="width:80%">

            <div class="layui-input-inline">

                <input id="cardCode" type="text" name="cardCode"  placeholder="请输入" autocomplete="off" class="layui-input">//下拉框样式

                 <input type="hidden" name="cardCode" id="cardCode2" value="${salesOrder.cardCode}">//传入后台的code

            </div>

        </div>

    </div>

    <div class="layui-form-item">

        <div class="layui-input-block">

            <button class="layui-btn" lay-submit lay-filter="Form">保存</button>

            <button type="reset" class="layui-btn layui-btn-primary">重置</button>

        </div>

    </div>

</form>

</body>

//缺少layui css等文件自己引入

<script src="${contextPath}/static/layui/layui.all.js"></script>

<script src="${contextPath}/static/tableSelect/tableSelect.js" type="text/javascript" charset="utf-8"></script>

<script src="${contextPath}/static/backend/js/baseManage/salesOrder/salesOrder_edit.js"></script>

<script type="text/javascript">

var form = layui.form;

form.render();

var tableSelect = layui.tableSelect;//非模块化使用

tableSelect.render({

    elem: '#cardCode',//主建 和cols的cardcode对应

    checkedKey: 'cardCode',//和cols的cardCode相对应

    searchKey: 'cardName',//传入后台的搜索关键字

    table: {

        url: 'xx/findAllByPageAndLimit',//后台java代码接口

        cols: [[

            { type: 'radio' },//开启单选

            { field: 'cardCode', title: '业务伙伴代码', width: 100 },//列名1

            { field: 'cardName', title: '业务伙伴名称', width: 100 },//列名2

        ]]

    },

    done: function (elem, data) {//点击选择之后的回调

        var NEWJSON = []

        layui.each(data.data, function (index, item) {

            NEWJSON.push(item.cardName)

            $("#cardCode2").val(item.cardCode)

        })

        elem.val(NEWJSON.join(","))

    }

})

</script>

java代码：

控制层

@RequestMapping(value="/findAllByPageAndLimit",method=RequestMethod.GET)

    @ResponseBody

    Map<String, Object> findAllByPageAndLimit(SapSupplierModel sapSupplierModel,int page,int limit) {

        Map<String, Object> map = new HashMap<>();

        Page<SapSupplier> p = sapSupplierService.findPage(sapSupplierModel, page, limit);

        List<SapSupplierXiaLaJson> list = new ArrayList<>();

        int a = 0;

        for (SapSupplier sapSupplier : p.getContent()) {

            a++;

            if (sapSupplier != null) {

                list.add(new SapSupplierXiaLaJson(sapSupplier,a));

            }

        }

        map.put("code", 0);

        map.put("data", list);

        map.put("count", new Long(p.getTotalElements()).intValue());

        map.put("msg", "成功");

        return map;

    }

实现层：

@Override

    public Page<SapSupplier> findPage(SapSupplierModel sapSupplierModel, int currentPage, int pageSize) {

        Specification<SapSupplier> specification = new Specification<SapSupplier>() {

            @Override

            public Predicate toPredicate(Root<SapSupplier> root, CriteriaQuery<?> query,

                                         CriteriaBuilder cb) {

                List<Predicate> list = new ArrayList<>();

                Predicate deleteMark = cb.equal(root.get("deleteMark").as(Boolean.class), false);

                list.add(deleteMark);

                if (!CommonUtil.isEmpty(sapSupplierModel.getCardName())) {

                    Predicate cardName = cb.like(root.get("cardName"), "%" + sapSupplierModel.getCardName().trim() + "%");

                    list.add(cardName);

                }

                Predicate[] predicates = new Predicate[list.size()];

                return cb.and(list.toArray(predicates));

            }

        };

        //排序

        List<Order> orders = new ArrayList<>();

        orders.add(new Order(Direction.ASC, "createDate"));

        Sort sort = Sort.by(orders);

        Pageable pageable = PageRequest.of(currentPage - 1, pageSize, sort);

        return sapSupplierRepository.findAll(specification, pageable);

    }

Page<SapSupplier> findPage(SapSupplierModel sapSupplierModel, int currentPage, int pageSize);

持久层：

Page<SapSupplier> findPage(SapSupplierModel sapSupplierModel, int currentPage, int pageSize);

巴特西

layui下拉框数据过万渲染渲染问题解决方案

tableSelect 下拉表格选择器

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