我一直得到＆＃34;无效的json响应＆＃34;来自datatable Jq插件， 我发布我的webmethod和HTML结构以及AJAX调用， 我怀疑我的web方法没有正确地序列化为JSON格式，但是当我测试格式时我发现它有效（http://jsonlint.com/）。我无法在这里找出问题
<WebMethod()> _
<ScriptMethod(ResponseFormat:=ResponseFormat.Json, UseHttpGet:=False, XmlSerializeString:=False)> _
Public Function SrcTblRegx()
Dim constr As String = ConfigurationManager.ConnectionStrings("ARTSQLConStrng").ConnectionString
Using con As New SqlConnection(constr)
Using cmd As New SqlCommand("TblRegSearchx", con)
cmd.CommandType = CommandType.StoredProcedure
cmd.Connection = con
Dim ds As New DataSet()
Using sda As New SqlDataAdapter(cmd)
sda.Fill(ds)
End Using
Dim jsondata As String = JsonConvert.SerializeObject(ds)
Return jsondata
End Using
End Using
End Function
Webmethod输出
<anyType xmlns:q1="http://www.w3.org/2001/XMLSchema" xmlns:d1p1="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://tempuri.org/" d1p1:type="q1:string">
{"Table":[{"Filenum":15112777,"FullName":"marwam saleh moh saleem","DOB":"2015-11-26T00:00:00"}]}
</anyType>
<table id="RegSrc2" class="table table-bordered table-striped">
<thead>
<tr>
<th><b>File Number</b></th>
<th><b>Patient Name</b></th>
<th><b>DOB</b></th>
</tr>
</thead>
<tbody></tbody>
<tfoot>
<tr>
<th><b>File Number</b></th>
<th><b>Patient Name</b></th>
<th><b>DOB</b></th>
</tr>
</tfoot>
</table>
$(document).ready(function () {
var $table = $('#RegSrc2');
$table.dataTable({
bProcessing: true,
"serverSide": true,
"sAjaxSource": $table.data('../CONFIG/WebSerTblsSearch.asmx/SrcTblRegx'),
})
});
我也在添加网页浏览器错误
jquery.dataTables.js:3929 Uncaught TypeError: Cannot set property 'data' of null
at _fnBuildAjax (jquery.dataTables.js:3929)
at _fnAjaxUpdate (jquery.dataTables.js:3946)
at _fnDraw (jquery.dataTables.js:3409)
at _fnReDraw (jquery.dataTables.js:3528)
at _fnInitialise (jquery.dataTables.js:4710)
at loadedInit (jquery.dataTables.js:1320)
at HTMLTableElement.<anonymous> (jquery.dataTables.js:1332)
at Function.each (jquery-2.1.4.js:374)
at jQuery.fn.init.each (jquery-2.1.4.js:139)
at jQuery.fn.init.DataTable [as dataTable] (jquery.dataTables.js:869)
答案 0 :(得分：1)
这是我的方式。我使用帖子而不是使用Web服务获得了更多成功。此外，因为您的Web服务正在序列化（我以相同的方式执行），json对象最终被序列化两次。此外，数据表期望数据采用{data：[您的数据]}和Web服务返回{d：[您的数据序列化]}的形式，您必须在客户端进行调整。我就是这样做的。
$(document).ready(function () {
$('#example').DataTable({
"processing": false,
// since you are getting all the data at once set serverSide to
// false, otherwise using the built in search and paging will trigger
// more ajax calls to get the same data.
"serverSide": false,
"ajax": {
// returning the data from the server as json data
contentType: "application/json; charset=utf-8",
// assuming your url is right....
url: "../CONFIG/WebSerTblsSearch.asmx/SrcTblRegx",
type: "Post",
// You are not sending parameters to the server so next line commented out
data: function (dtParms) {
return JSON.stringify({ SrchTxt: "your search string" });
},
dataFilter: function (res) {
// do what you need to the data before it loads to the table
// first deserialization
var parsed = JSON.parse(res);
// now you can access the data in d and deserialize that
var morp = JSON.parse(parsed.d);
// reserialize to what datatables expect.
return JSON.stringify( { data: morp });
},
error: function (x, y) {
console.log(x);
}
},
columns:[
{data:"Filenum"},
{data: "FullName"},
{data:"DOB"}]
});
});
答案 1 :(得分：0)
我从上面的代码中做了更改，我使用数据表而不是数据集。
此序列化数据表的代码
Public Function DataTableToJSONWithJavaScriptSerializer(table As DataTable) As String
Dim jsSerializer As New JavaScriptSerializer()
Dim parentRow As New List(Of Dictionary(Of String, Object))()
Dim childRow As Dictionary(Of String, Object)
For Each row As DataRow In table.Rows
childRow = New Dictionary(Of String, Object)()
For Each col As DataColumn In table.Columns
childRow.Add(col.ColumnName, row(col))
Next
parentRow.Add(childRow)
Next
Return jsSerializer.Serialize(parentRow)
End Function
服务器端处理，webmethod（存储过程）
<WebMethod()> _
<ScriptMethod(ResponseFormat:=ResponseFormat.Json)> _
Public Function SrcTblReg(ByVal SrchTxt As String)
Dim constr As String = ConfigurationManager.ConnectionStrings("ARTSQLConStrng").ConnectionString
Using con As New SqlConnection(constr)
Using cmd As New SqlCommand("TblRegSearch", con)
cmd.CommandType = CommandType.StoredProcedure
If (String.IsNullOrEmpty(SrchTxt)) Then
cmd.Parameters.Add("@Searchtxt", SqlDbType.NVarChar).Value = DBNull.Value
Else
cmd.Parameters.Add("@Searchtxt", SqlDbType.NVarChar).Value = SrchTxt.Trim()
End If
cmd.Connection = con
Using sda As New SqlDataAdapter(cmd)
Dim dt As New DataTable()
sda.Fill(dt)
Dim sJSON = DataTableToJSONWithJavaScriptSerializer(dt)
Return sJSON
End Using
'Dim jsondata As String = JsonConvert.SerializeObject(ds)
'Return jsondata
End Using
End Using
End Function
最后是Bindrid提供的客户端。
$(document).ready(function () {
$('#example').DataTable({
"processing": false,
// since you are getting all the data at once set serverSide to
// false, otherwise using the built in search and paging will trigger
// more ajax calls to get the same data.
"serverSide": false,
"ajax": {
// returning the data from the server as json data
contentType: "application/json; charset=utf-8",
// assuming your url is right....
url: "../CONFIG/WebSerTblsSearch.asmx/SrcTblRegx",
type: "Post",
// You are not sending parameters to the server so next line commented out
data: function (dtParms) {
return JSON.stringify({ SrchTxt: "your search string" });
},
dataFilter: function (res) {
// do what you need to the data before it loads to the table
// first deserialization
var parsed = JSON.parse(res);
// now you can access the data in d and deserialize that
var morp = JSON.parse(parsed.d);
// reserialize to what datatables expect.
return JSON.stringify( { data: morp });
},
error: function (x, y) {
console.log(x);
}
},
columns:[
{data:"Filenum"},
{data: "FullName"},
{data:"DOB"}]
});
});