DataTables错误：“请求的未知参数”

小编典典

DataTables错误：“请求的未知参数”

spring-mvc

我是DataTables jQuery插件的新手。在发现IE
8的Javascript性能问题后，我决定更改使用DataTables进行服务器端处理的方式。当我的JSP加载时（我正在使用Spring
3），我收到此错误消息：

DataTables warning (table id = 'results_table'): Requested unknown parameter '0' from the data source for row 0

我在Google周围搜索，发现导致该错误消息的许多原因都归结为格式错误的JSON，因此我找到了一种从Spring
3控制器函数输出JSON的方法，以查看其生成的JSON，并更改了代码以将其转换为非常接近DataTables网站所说的外观。

仍然没有喜悦，仍然收到该错误消息。

我为DataTables找到的服务器端处理示例不包含用于指定客户端使用的列的代码，因此我假设我不需要它。可以吗

这是我的results.jsp的相关部分：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >

<head>
    <title>ACME: search results in a nice DataTables.net Plugin</title>
</head>
<body>

<link rel="stylesheet" type="text/css" href="css/jquery.dataTables.css" />
<script language = "JavaScript" type = "text/javascript" src = "../nsd/js/jquery-1.7.js"></script>
<script language = "JavaScript" type = "text/javascript" src = "../nsd/js/jquery.dataTables.js"></script>

<script type="text/javascript">
$(document).ready(function() {
    $('#results_table').dataTable( {
        "bProcessing": true,
        "bServerSide": true,
        "sScrollX": "600px",
        "sServerMethod": "POST",
        "sAjaxSource": "/acme/resultstable",
    } );
} );
</script>


<form id="command" name="f" action="employee" method="post">

    <div id = "results">
        <table id = "results_table">
            <thead>           
                <tr>
                    <th>&nbsp;</th>
                    <th>ID</th>
                    <th>NO_PRINT</th>
                    <th>Full Name</th>
                    <th>Email Address</th>
                    <th>Phone Number</th>
                    <th>Organization</th>
                    <th>Organization Code</th>
                    <th>Position</th>
                    <th>Employee Type</th>
                </tr>
            </thead>
            <tbody>           
            </tbody>
        </table>

    </body>
</html>

这是我一直发送给它的JSON响应：

{
  "sEcho" : 1,
  "iTotalRecords" : 1,
  "iTotalDisplayRecords" : 1,
  "aaData" : [ {
    "person_id" : "888888",
    "ID" : "999999",
    "no_print" : "&nbsp;",
    "fullname" : "Obama, Willard",
    "email_address" : "<a href = \"mailto:barry@whitehouse.gov\">barry@whitehouse.gov</a>",
    "current_phone_number" : "303-867-5309",
    "title" : "&nbsp;",
    "office" : "&nbsp;",
    "position" : "Contractor",
    "empl_code" : "CONT"
  } ]
}

这是我用来通过Jackson发送JSON响应的Spring控制器函数。这包括用于输出JSON的代码，因此我可以看到它的外观。它输出到stdout的JSON和我发送回DataTables的JSON是否可能不同？

@RequestMapping(value = "/resultstable", method = RequestMethod.POST)
public @ResponseBody LinkedHashMap resultstable(ModelMap model,                 
                                                HttpSession session,
                                                @RequestParam (required=true) int sEcho,   
                                                @RequestParam (required=true) int iDisplayStart,   
                                                @RequestParam (required=true) int iDisplayLength,    
                                                @RequestParam (required=true) int iColumns,
                                                @RequestParam (required=true) int iSortCol_0, 
                                                @RequestParam (required=false)String sSortDir_0,
                                                @RequestParam (required=true) String sSearch ) {

    /*
    **********************************************************************
    **  These come from the DataTables.net Jquery plugin on results.jsp
    **********************************************************************
    **  sEcho,          -  just send it back, used by DataTables for synching
    **  iDisplayStart   -  index of the record to start with, ie 3 for the 3rd of 100 records
    **  iDisplayLength  -  number of records to send back starting with iDisplayStart  
    **  iColumns        -  number of columns to be displayed in the table
    **  iSortCol_0      -  the number of thee column to be sorted on
    **  sSortDir_0      -  direction of sorting: asc or desc
    **  sSearch         -  from the search box, filter results further on this term 
    ********************************************************************** 
    */

    String nextView                   = "results";
    String usertype                   = (String)session.getAttribute("usertype");
    Search search                     = new Search(usertype);
    List<LinkedHashMap> records       = null;
    String results                    = null;
    int number_of_records             = (Integer)session.getAttribute("number_of_records_found");
    ResultsView rv                    = new ResultsView();
    ResultsScreenTableHolder rstrh    = null;
    SearchScreenDataHolder ssdh2      = (SearchScreenDataHolder)session.getAttribute("search_screen_data_holder");
    ObjectMapper mapper               = new ObjectMapper();

    logger.debug("started");

    logger.debug("sEcho,         == " + sEcho         );
    logger.debug("iDisplayStart  == " + iDisplayStart  );
    logger.debug("iDisplayLength == " + iDisplayLength );
    logger.debug("iColumns       == " + iColumns       );
    logger.debug("iSortCol_0     == " + iSortCol_0     );
    logger.debug("sSortDir_0     == " + sSortDir_0     );
    logger.debug("sSearch        == " + sSearch        );


    try {
        records = search.searchForAnEmployee(ssdh2,usertype,sSearch,"asc",
                                             iSortCol_0,iDisplayStart, 
                                             iDisplayLength);


        LinkedHashMap lhm= new java.util.LinkedHashMap();
        lhm.put("sEcho", sEcho);
        lhm.put("iTotalRecords",number_of_records);
        lhm.put("iTotalDisplayRecords",9);
        lhm.put("aaData",records);

        // convert user object to json string, and save to a file
        mapper.writeValue(new File("c:\\Downloads\\rstrh.json.txt"), lhm);

        // display to console
        logger.debug("My JSON: " + mapper.defaultPrettyPrintingWriter().writeValueAsString(lhm));

    }
    catch (Exception e) {
        logger.debug("\n",e);
    }

    return lhm;

}// end function

阅读 481

2020-06-01

共1个答案

小编典典

今天早上我遇到了同样的问题。您需要具有aoColumns参数并在其中使用mDataProp As：

https://gist.github.com/1660712

至少它解决了我的问题。

2020-06-01