jQuery外掛程式select2利用ajax高效查詢大數據列表

 沉默王二 

@RequestMapping(value = "loadMembersInfo") public void loadMembersInfo(HttpServletRequest request, HttpServletResponse response) throws IOException { Integer uid = StrUtil.parseStringToInt(request.getParameter("uid")); Members mem = this.memberService.selectByPrimaryKey(uid); // 分页参数的转换，需要和前台select2进行匹配，下文放代码 BaseConditionVO vo = getBaseConditionVOForTable(request); vo.addParams("username", StrUtil.getUTF8String(request.getParameter("username"))); vo.addParams("uid", uid); // 封装结果集，和前台select2也是匹配的。 PageGrid page = createPageGrid(this.membersMapper.getPromoterList(vo, vo.createRowBounds()), vo, this.membersMapper.searchPromoterTotalCount(vo)); // 以json格式写入到response out(page, response); }

BaseConditionVO.Java public class BaseConditionVO { public final static int PAGE_SHOW_COUNT = 50; private int pageNum = 1; private int numPerPage = 0; private int totalCount = 0; private String orderField; private String orderDirection; /** * @Fields ps : 对参数类型进行封装. */ private Map mo = new HashMap(); public int getPageNum() { return pageNum; } public void setPageNum(int pageNum) { this.pageNum = pageNum; } public int getNumPerPage() { return numPerPage > 0 ? numPerPage : PAGE_SHOW_COUNT; } public void setNumPerPage(int numPerPage) { this.numPerPage = numPerPage; } public String getOrderField() { return orderField; } public void setOrderField(String orderField) { this.orderField = orderField; } public String getOrderDirection() { return "desc".equals(orderDirection) ? "desc" : "asc"; } public void setOrderDirection(String orderDirection) { this.orderDirection = orderDirection; } public int getTotalCount() { return totalCount; } public void setTotalCount(int totalCount) { this.totalCount = totalCount; } public int getStartIndex() { int pageNum = this.getPageNum() > 0 ? this.getPageNum() - 1 : 0; return pageNum * this.getNumPerPage(); } public RowBounds createRowBounds() { RowBounds ro = new RowBounds(this.getStartIndex(), this.getNumPerPage()); return ro; } /** * @Title: addParams * @Description: 添加查询条件 * @param key * @param value */ public void addParams(String key, Object value) { this.getMo().put(key, value); } /** * @Title: getParams * @Description: 获取查询条件 * @param key * @return */ public Object getParams(String key) { return this.getMo().get(key); } /** * @return the mo */ public Map getMo() { return mo; } /** * @param mo * the mo to set */ public void setMo(Map mo) { this.mo = mo; } }

protected BaseConditionVO getBaseConditionVOForTable(HttpServletRequest req) { BaseConditionVO vo = new BaseConditionVO(); // 当前页 int currentPage = StrUtil.parseStringToInt(req.getParameter("page")); // 一页显示多少行 int sizes = StrUtil.parseStringToInt(req.getParameter("rows")); // 排序 String sortOrder = StrUtil.getString(req.getParameter("sord")); String sortCol = StrUtil.getString(req.getParameter("sidx")); vo.setNumPerPage(sizes); vo.setPageNum(currentPage); vo.setOrderField(sortCol); vo.setOrderDirection(sortOrder); return vo; }

@XStreamAlias("pageGrid") @SuppressWarnings("rawtypes") public class PageGrid { private int page; // 总页数，和select2的processResults.pagination匹配 private int total; private int records; // 数据结果集，和select2的processResults.results匹配 private List data; public int getPage() { return this.page; } public void setPage(int page) { this.page = page; } public int getTotal() { return this.total; } public void setTotal(int total) { this.total = total; } public int getRecords() { return this.records; } public void setRecords(int records) { this.records = records; } public List getData() { return this.data; } public void setData(List data) { this.data = data; } }

protected PageGrid createPageGrid(List list, BaseConditionVO vo, int searchTotalCount) { PageGrid pageGrid = new PageGrid(); // 数据 pageGrid.setData(list); // 当前页 pageGrid.setPage(vo.getPageNum()); // 总数目 pageGrid.setRecords(list.size()); // 总页数 int total = 0; if (pageGrid.getRecords() != 0) { total = searchTotalCount % vo.getNumPerPage() == 0 ? searchTotalCount / vo.getNumPerPage() : searchTotalCount / vo.getNumPerPage() + 1; } pageGrid.setTotal(total); return pageGrid; }

List getPromoterList(BaseConditionVO vo, RowBounds createRowBounds);

 select m.uid as id, convert(m.username,char) username, m.realname, m.children_count, m.headimgUrl from members m where m.deleteflag=0 and m.username like CONCAT('%', '${mo.username}', '%')   ORDER BY ${orderField} ${orderDirection}   order by m.username DESC   

int searchPromoterTotalCount(BaseConditionVO vo);

 select count(0) as a from members m where m.deleteflag=0 and m.username like CONCAT('%', '${mo.username}', '%') 

protected void out(Object result, HttpServletResponse response) throws IOException { ServletOutputStream out = response.getOutputStream(); ObjectMapper objectMapper = new ObjectMapper(); objectMapper.writeValue(out, result); out.flush(); }

Results.prototype.option = function (data) { var option = document.createElement('li'); option.className = 'select2-results__option'; var attrs = { 'role': 'treeitem', 'aria-selected': 'false' }; if (data.disabled) { delete attrs['aria-selected']; attrs['aria-disabled'] = 'true'; } // id为空的情况下，删除的aria-selected，而aria-selected恰好又是列表选中的关键属性。 // 这个就是个坑，只能这么说，select2给出的api上完全不讲这点，我去！！！！！！！ if (data.id == null) { delete attrs['aria-selected']; } ...... }

S2.define('select2/data/minimumInputLength',[ ], function () { function MinimumInputLength (decorated, $e, options) { this.minimumInputLength = options.get('minimumInputLength'); // inputMessage this.inputMessage = options.get('inputMessage'); decorated.call(this, $e, options); } MinimumInputLength.prototype.query = function (decorated, params, callback) { params.term = params.term || ''; if (params.term.length 
select2.js中defaults中增加上inputMessage
 this.defaults = { ... minimumInputLength: 0, inputMessage: '', maximumInputLength: 0, ... };
        

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inputTooShort : function(e) { if (e.inputMessage) { return e.inputMessage;// 增加inputMessage } else { var t = e.minimum - e.input.length, n = "请再输入至少" + t + "个字符"; return n } },