Explication détaillée des exemples de code de chargement direct et de chargement paresseux de la table jquery

Besoin d'introduire jquery.js, jquery.dataTables.js, dataTables.bootstrap.js (facultatif),

Charger directement , cette comparaison. Simple, comme suit

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

jsp utilise la grille bootstrap, js est comme suit

<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>

backend Passez simplement un json

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 Chargement retardé
Parce que l'ancien projet utilise struts1, il y a un problème avec le front-. fin du formulaire de réception des paramètres. , utilisez donc directement le servlet pour recevoir le
jsp frontal lorsque 1 se charge directement, le js est le suivant

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();
}

Remarque : Il s'agit déjà d'une version simplifiée. Oui, l'en-tête du tableau peut être ignoré en utilisant un autre ajax. Il est omis ici et écrit à mort.
Ce qui suit est la partie des coulisses

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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