我找到了一些“解决方案”。

这段代码不起作用:

<table>
<thead>
    <tr>
        <th colspan="3">Test</th>
    </tr>
</thead>
<tbody>
    <tr>
        <td>1</td>
        <td>2</td>
        <td>3</td>
    </tr>
</tbody>

但这是可以的:

<table>
<thead>
    <tr>
        <th colspan="2">Test</th>
        <th></th>
    </tr>
</thead>
<tbody>
    <tr>
        <td>1</td>
        <td>2</td>
        <td>3</td>
    </tr>
</tbody>

我认为，问题是，最后一个TH不能有colspan属性。

In my case, and using ASP.NET GridView, UpdatePanel and with DropDownList (with Chosen plugin where I reset value to zero using a Javascript line), I got this error and tried everything with no hope for days. The problem was that the code of my dropdown in code behind was as follows and when I select a value twice to apply its action to selected grid rows I get that error. I thought for days it's a Javascript issue (again, in my case) and finally the fix was giving zero for the drowpdown value with the update process:

  private void ddlTasks_SelectedIndexChanged(object sender, System.EventArgs e)
  {
     if (ddlTasks.SelectedValue != 0) {
        ChangeStatus(ddlTasks.SelectedValue);
        ddlTasks.SelectedValue = "0"; //// **This fixed my issue**
     }

     dvItemsGrid.DataSource = CreateDatasource();
     dvItemsGrid.DataBind();
     dvItemsGrid.UseAccessibleHeader = true;
     dvItemsGrid.HeaderRow.TableSection = TableRowSection.TableHeader;

  }

这是我的错:

     $('#<%= DropDownList.ClientID%>').val('0').trigger("chosen:updated").chosen();

技巧1:

参考这个链接，你会得到一些想法:

https://datatables.net/forums/discussion/20273/uncaught-typeerror-cannot-read-property-mdata-of-undefined

提示2:

检查以下是否正确:

请检查Jquery版本 请检查您的CDN或本地数据表相关的。min和css文件的版本 你的表有<thead></thead> & <tbody></tbody>标签 你的表标题列长度与正文列长度相同 在style='display:none'中使用一些cloudns，同样的属性适用于Header和body。 你的表列没有空，使用一些像[Null，——，NA, Nil] 你的表格没有<td>， <tr>问题

对于列标题，您需要将行包装为<thead>，对于行包装为<tbody>。还要确保您有匹配的编号。列标题<th>，就像对td

无法读取未定义的属性'fnSetData'的常见原因是列数不匹配，就像下面的错误代码:

<thead>                 <!-- thead required -->
    <tr>                <!-- tr required -->
        <th>Rep</th>    <!-- td instead of th will also work -->
        <th>Titel</th>
                        <!-- th missing here -->
    </tr>
</thead>
<tbody>
    <tr>
        <td>Rep</td>
        <td>Titel</td>
        <td>Missing corresponding th</td>
    </tr>
</tbody>

下面的代码中，每<td>(列数必须匹配)包含一个<th>:

<thead>
    <tr>
        <th>Rep</th>       <!-- 1st column -->
        <th>Titel</th>     <!-- 2nd column -->
        <th>Added th</th>  <!-- 3rd column; th added here -->
    </tr>
</thead>
<tbody>
    <tr>
        <td>Rep</td>             <!-- 1st column -->
        <td>Titel</td>           <!-- 2nd column -->
        <td>th now present</td>  <!-- 3rd column -->
    </tr>
</tbody>

当使用带有colspan但没有第二行的格式良好的标题时，也会出现这种错误。

对于一个有7列的表，下面的不工作，我们看到“不能读取属性'mData' of undefined”在javascript控制台中:

<thead>
    <tr>
        <th>Rep</th>
        <th>Titel</th>
        <th colspan="5">Download</th>
    </tr>
</thead>

虽然这是有效的:

<thead>
    <tr>
        <th rowspan="2">Rep</th>
        <th rowspan="2">Titel</th>
        <th colspan="5">Download</th>
    </tr>
    <tr>
        <th>pdf</th>
        <th>nwc</th>
        <th>nwctxt</th>
        <th>mid</th>
        <th>xml</th>
    </tr>
</thead>

发生这种情况的另一个原因是DataTable初始化中的columns参数。

列的数量必须与标题相匹配

"columns" : [ {
                "width" : "30%"
            }, {
                "width" : "15%"
            }, {
                "width" : "15%"
            }, {
                "width" : "30%"
            } ]

我有7列

<th>Full Name</th>
<th>Phone Number</th>
<th>Vehicle</th>
<th>Home Location</th>
<th>Tags</th>
<th>Current Location</th>
<th>Serving Route</th>