Detailed explanation of jquery table direct loading and lazy loading code examples

Need to introduce jquery.js, jquery.dataTables.js, dataTables.bootstrap.js (optional),

1. Directly load , this comparison Simple, as follows

<p id="tid" class="col-sm-12 col-md-12">
  <p id="secondtid" hidden="hidden"></p>
</p>

jsp uses the bootstrap grid, js is as follows

<script type="text/javascript">
    function getgaoxinqu() {
      $(&#39;#secondtid&#39;).remove();
      $("#tid").append(
              "<p id=&#39;secondtid&#39; style=&#39;width: 100%;&#39;><table id=&#39;table_id&#39; class=&#39;table table-striped table-bordered table-hover no-footer dataTable display&#39; ><thead><tr><th nowrap>id</th><th nowrap>高新区名称</th><th nowrap>地区</th><th nowrap>工商注册企业数</th><th nowrap>网址</th><th nowrap>工业总产值(千元)</th><th nowrap>工业增加值(千元)</th><th nowrap>主导产业</th><th nowrap>财政收入（万元）</th><th nowrap>财政支出（万元）</th></tr></thead><tbody></tbody></table></p>");
      $.ajax({
            url : &#39;${contextPath}/mst/theme/otherOperatePlatformTheme.do?flag=gaoxinqu&#39;,// 跳转到 action 
            data : {
              barName : &#39;1&#39;
            },
            serverSide: true,//服务器处理 
            traditional : true,
            type : &#39;post&#39;,
            success : function(data) {
              var dataObj = eval(data);
              $(&#39;#table_id&#39;).DataTable(
                      {
                        data : dataObj,
                        sScrollY: 600,
                        sScrollX: &#39;100%&#39;,
                        columns : [ {
                          data : &#39;id&#39;
                        },{
                          data : &#39;name&#39;
                        }, {
                          data : &#39;dy&#39;
                        }, {
                          data : &#39;gxqyy&#39;
                        }, {
                          data : &#39;www&#39;
                        }, {
                          data : &#39;gysum&#39;
                        }, {
                          data : &#39;gyadd&#39;
                        }, {
                          data : &#39;zdcy&#39;
                        } , {
                          data : &#39;cztr&#39;
                        } , {
                          data : &#39;czzc&#39;
                        } ],
                        order:[[ 0, "asc" ]],
                        language : {
                          search : "在表格中搜索:",
                          show : "显示",
                          "sProcessing" : "处理中...",
                          "sLengthMenu" : "显示 _MENU_ 项结果",
                          "sZeroRecords" : "没有匹配结果",
                          "sInfo" : "显示第 _START_ 至 _END_ 项结果，共 _TOTAL_ 项",
                          "sInfoEmpty" : "显示第 0 至 0 项结果，共 0 项",
                          "sInfoFiltered" : "(由 _MAX_ 项结果过滤)",
                          "sInfoPostFix" : "",
                          "sSearch" : "搜索:",
                          "sUrl" : "",
                          "sEmptyTable" : "表中数据为空",
                          "sLoadingRecords" : "载入中...",
                          "sInfoThousands" : ",",
                          "oPaginate" : {
                            "sFirst" : "首页",
                            "sPrevious" : "上页",
                            "sNext" : "下页",
                            "sLast" : "末页"
                          },
                          "oAria" : {
                            "sSortAscending" : ": 以升序排列此列",
                            "sSortDescending" : ": 以降序排列此列"
                          }
                        }
                      });
              showPage();
            },
            error : function() {
              alert("异常！");
            }
          });
      showPage();//高度调节
    }
</script>

Just pass a json in the background

List<GaoXinDistrict> gxlist=new ArrayList<GaoXinDistrict>();
      String sql="select * from ODS10000060";
      try {
        List<Map> list = oracledictionaryService.executeSqlToRecordMap(sql);
        for (Map map : list) {
          GaoXinDistrict gx=new GaoXinDistrict();
          Object id= map.get("ID");
          Object name = map.get("NAME");
          Object JB = map.get("JB");
          Object DY = map.get("DY");
          Object YEAR = map.get("YEAR");
          Object FZR = map.get("FZR");
          Object TBR = map.get("TBR");
          Object phone = map.get("PHONE");
          Object EMAIL = map.get("EMAIL");
          Object WWW = map.get("WWW");
          Object GXQMJSUM = map.get("GXQMJSUM");
          Object JCMJ = map.get("JCMJ");
          Object GXQYY = map.get("GXQYY");
          Object GYSUM = map.get("GYSUM");
          Object GYADD = map.get("GYADD");
          Object CZTR = map.get("CZTR");
          Object CZZC = map.get("CZZC");
          Object DEC = map.get("DEC");
          Object ZDCY = map.get("ZDCY");

          gx.setId(Integer.parseInt(String.valueOf(id)));
          gx.setName(name.toString());
          gx.setJB(JB.toString());
          gx.setDY(DY.toString());
          gx.setYEAR(YEAR.toString());
          gx.setFZR(FZR.toString());
          gx.setTBR(TBR.toString());
          gx.setPhone(phone.toString());
          gx.setEMAIL(EMAIL.toString());
          gx.setWWW(WWW.toString());
          gx.setGXQMJSUM(GXQMJSUM.toString());
          gx.setJCMJ(JCMJ.toString());
          gx.setGXQYY(GXQYY.toString());
          gx.setGYSUM(GYSUM.toString());
          gx.setGYADD(GYADD.toString());
          gx.setCZTR(CZTR.toString());
          gx.setCZZC(CZZC.toString());
          gx.setDEC(DEC.toString());
          gx.setZDCY(ZDCY.toString());

          gxlist.add(gx);
        }
        parseJSONResult(gxlist, response);
      } catch (Exception e) {
        e.printStackTrace();
      }

2. Delayed loading
Because the old project uses struts1, there is a problem with the front-end form receiving parameters, so we directly use servlet to receive it.
The front-end jsp is loaded directly like 1, and the js is as follows

function initDatatables(){
  /*var columns = new Array();
  $("#listTable thead th").each(function(index, element) {
    var fieldName=$(element).attr("fieldName");
    if(fieldName.indexOf('.')>0)fieldName=fieldName.substring(2);
    columns.push({"data":fieldName});
  }); 
  if($(&#39;#listTable&#39;).length<=0) return;
  //-- 列定义
  var columnDefs = new Array();
  $("#listTable thead th").each(function(index, element) {
    if($(element).attr("fieldType")!=&#39;VARCHAR&#39;){        
      columnDefs.push({        
         "orderable": true, 
         "searchable" : false,
         "targets": index });
    }    
  });*/

  $(&#39;#listTable&#39;).DataTable( {
    "processing": true,//处理中显示
    "serverSide": true,//服务器处理 
    "sScrollY": 300,
    "sScrollX": "100%", 
    "columns":[{"data":"ID"},{"data":"YEAR"},{"data":"REGION"},{"data":"GYZCZ"},{"data":"QYS"}],
    /*"columns":columns,*/
    /*"columnDefs":columnDefs,*/
//   "bInfo": false,
//   "bPaginate": false,
//   "bFilter":false,/servlet/ComplexInquireServlet
//    "bLengthChange": false,
    "ajax": {
      "url": urlContextPath+"/mst/DatatablesLazyLoadServlet?flag=details",
      "type": "POST",
      "data": function ( d ) {
        var queryForm = document.queryConditionForm;                
        d[&#39;fieldCode&#39;] = &#39;ID,YEAR,REGION,GYZCZ,QYS&#39;;
        d[&#39;tableCode&#39;] = &#39;ODS10000030&#39;; //表名
      }
    },
    "oLanguage": {
      "search" : "在表格中搜索:",
      "show" : "显示",
      "sProcessing" : "处理中...",
      "sLengthMenu" : "显示 _MENU_ 项结果",
      "sZeroRecords" : "没有匹配结果",
      "sInfo" : "显示第 _START_ 至 _END_ 项结果，共 _TOTAL_ 项",
      "sInfoEmpty" : "显示第 0 至 0 项结果，共 0 项",
      "sInfoFiltered" : "(由 _MAX_ 项结果过滤)",
      "sInfoPostFix" : "",
      "sSearch" : "搜索:",
      "sUrl" : "",
      "sEmptyTable" : "表中数据为空",
      "sLoadingRecords" : "载入中...",
      "sInfoThousands" : ",",
      "oPaginate" : {
        "sFirst" : "首页",
        "sPrevious" : "上页",
        "sNext" : "下页",
        "sLast" : "末页"
      },
      "oAria" : {
        "sSortAscending" : ": 以升序排列此列",
        "sSortDescending" : ": 以降序排列此列"
      }
    }
  } );
  showPage();
}


function showQueryTable(){
  //建table
  $(&#39;#secondtid&#39;).remove();
  $("#tid").append(
          "<p id=&#39;secondtid&#39; style=&#39;width: 100%;&#39;>" +
          "<table id=&#39;listTable&#39; class=&#39;table table-striped table-bordered table-hover no-footer dataTable display&#39; ><thead><tr>" +
          "<th nowrap>id</th>" +
          "<th nowrap>年份</th>" +
          "<th nowrap>地区</th>" +
          "<th nowrap>工业总产值（万元）</th>" +
          "<th nowrap>企业数（家）</th>" +
          "</tr></thead><tbody></tbody></table>" +
          "</p>");
  //创建表头 
  /*$.ajax({
        url : urlContextPath+&#39;/mst/DatatablesLazyLoadServlet?flag=titles&#39;,// 跳转到 action 
        data : {
          index : &#39;&#39;
        },
        type : &#39;post&#39;,
        success : function(data) {
          var dataObj = eval(data);
        },
        error : function() {
          alert("异常！");
        }
  });*/
  //填充数据
  initDatatables();
}

Note: This is already a simplified version, the header can be used with another An ajax is passed over, so it is omitted here and written to death.
The following is the background part

public class DatatablesLazyLoad extends HttpServlet{
  @Override
  protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    this.process(request, response);
  }

  /**
   * datatables 延迟加载 数据加载，flag标注details表示注入数据，titles表示注入标题。
   * @param request
   * @param response
   */
  private void process(HttpServletRequest request, HttpServletResponse response) {
    ServletContext servletContext=request.getSession().getServletContext();
    WebApplicationContext wac =WebApplicationContextUtils.getRequiredWebApplicationContext(servletContext);
    DictionaryServiceImpl ds=(DictionaryServiceImpl)wac.getBean("oracledictionaryService");

    String flag = request.getParameter("flag");
    String tableCode = request.getParameter("tableCode");
    String fieldCode = request.getParameter("fieldCode");

    if(flag==null)return;
    if(flag.equals("titles")){

    }else if(flag.equals("details")){
      String draw = request.getParameter("draw");
      String start = request.getParameter("start");
      String length = request.getParameter("length");
      StringBuilder sql = new StringBuilder("select ");
      List titles = this.getTitles(tableCode,fieldCode,ds);
      for(int i=0;i<titles.size();i++){
        Map record = (Map)titles.get(i);      
        sql.append(" ").append(record.get("FIELDNAME")).append(", ");
      }
      if(sql.lastIndexOf(",")>0) sql.deleteCharAt(sql.lastIndexOf(","));
      sql.append(" from ").append(tableCode);
      sql.append(" where 1=1 ");
      String filterSql = getFilterSql(titles,request);
      Integer totalCount =ds.getSqlRecordCount("select count(*) from (" + sql.toString()+ ") tmp");
      Integer filterCount = ds.getSqlRecordCount("select count(*) from (" + sql.toString()+filterSql+ ") tmp");

      String[] strings = fieldCode.split(",");

      String orderSql = getOrderSql(strings,request);
      sql.append(filterSql);
      sql.append(orderSql);
      List<Map> lt = ds.executeSqlToRecordMap(sql.toString(),Integer.valueOf(start),Integer.valueOf(length));
      Map result = new LinkedHashMap();
      result.put("draw", draw);
      result.put("recordsTotal", totalCount);//记录总行数
      result.put("recordsFiltered", filterCount);//过滤的行数   

      int count=Integer.valueOf(length)+1;
      for(Map r : lt){
        r.put("DT_RowId", r.get("id"));//设置行主键

        Map rowDate = new LinkedHashMap();//row data
        rowDate.putAll(r);
        r.put("DT_RowData", rowDate);


        r.put("countInx", count);
        count++;
      }
      result.put("data", lt);
      try {
        convertListToJson(result, response);
      } catch (Exception e1) {
        // TODO Auto-generated catch block
        e1.printStackTrace();
      }
    }
  }

  /**
   * 得到所有的列标题名称
   * @return 
   */
  private List getTitles(String tableCode,String fieldCode,DictionaryServiceImpl ds){
    /*StringBuilder sql = new StringBuilder("select UPPER(ODS_DF_NAME) fieldName,ODS_DF_CN_NAME fieldLabel,ODS_DF_CODE fieldCode,UPPER(ODS_DF_DATA_TYPE) fieldType from ODS.ODS_DF_INFO_REG ");
    sql.append(" where ODS_TB_CODE= &#39;"+tableCode+"&#39; ");
    List<Map> list = ds.executeSqlToRecordMap(sql.toString());
    return list;*/


    StringBuilder sql = new StringBuilder("select UPPER(ODS_DF_NAME) fieldName,ODS_DF_CN_NAME fieldLabel,ODS_DF_CODE fieldCode,UPPER(ODS_DF_DATA_TYPE) fieldType from ODS.ODS_DF_INFO_REG ");
    sql.append(" where 1=1 ");
    sql.append(" and ODS_TB_CODE = &#39;"+tableCode+"&#39;");
    sql.append(" and ODS_DF_NAME in (");
    String[] tmp = fieldCode.split(",");
    StringBuilder ids = new StringBuilder();
    for(String t : tmp){
      if(StringUtils.isEmpty(t)) continue;
      ids.append("&#39;").append(t).append("&#39;,");
    }
    if(ids.lastIndexOf(",")>0) ids.deleteCharAt(ids.lastIndexOf(","));
    sql.append(ids);
    sql.append(")");    
    List lt = ds.executeSqlToRecordMap(sql.toString());
    return lt;
  }

  /**
   * 前台搜索
   * @param fieldLt
   * @return
   */
  private String getFilterSql(List<Map> fieldLt,HttpServletRequest request) {
    StringBuilder filterSql = new StringBuilder(" and ( ");
    String searchKey = "search[value]";
    String searchValue = request.getParameter(searchKey);
    System.out.println(searchValue);
    if(StringUtils.isEmpty(searchValue)) return "";
    List<String> filterDetail = new ArrayList();
    for(int i=0;i<fieldLt.size();i++){
      Map field = fieldLt.get(i);
      if(field.get("FIELDTYPE").equals("VARCHAR")){
        String subKey = "columns["+i+"][searchable]";    
        if("true".equals(request.getParameter(subKey))){
          String fieldName = field.get("FIELDNAME").toString();


          String subSql = fieldName + " like &#39;%"+searchValue+"%&#39;";
          filterDetail.add(subSql);
        }
      }
    }
    if(filterDetail.size()==0) return "";
    boolean f = true;
    for(String subSql : filterDetail){
      if(f){
        f= false;
        filterSql.append(subSql);
      }else{
        filterSql.append(" OR ").append(subSql);
      }
    }
    filterSql.append(")");

    return filterSql.toString();
  }

  /**
   * 排序
   * @param fieldLt
   * @return
   */
  private String getOrderSql(String[] titles,HttpServletRequest request){

    StringBuilder orderSql = new StringBuilder(" order by ");
    String indexKey = "order[0][column]";
    String dirKey = "order[0][dir]";
    Integer columnIndex = Integer.valueOf(request.getParameter(indexKey));
    String dir = request.getParameter(dirKey);
    if(columnIndex<=titles.length){
      orderSql.append(titles[columnIndex]).append(" ").append(dir);
      return orderSql.toString();
    }

    return "";
  }

  public void convertListToJson(Map map,HttpServletResponse response)throws Exception{
    JSONArray json = JSONArray.fromObject(map); 
    response.setHeader("Cache-Control", "no-cache");
    response.setContentType("text/html; charset=GBK"); 
    PrintWriter writer;
    writer = response.getWriter();
    writer.write(json.get(0).toString());
    writer.close();
  }
}

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