Question

我使用SqlAlchemy DataTable example作为尝试实施DataTables的基础。一切正常，我做了多个屏幕刷新，一切都很完美。现在，当我点击刷新时，我突然收到此错误KeyError: 'iDisplayStart'。我没有改变任何事情，或者至少我是这么认为的。这是我的python方法

@view_config(route_name='simple_example', request_method='GET', renderer='json')
def simple_example(request):
    # defining columns
    columns = []
    columns.append(ColumnDT('ixTransformerTurnsRatio'))
    columns.append(ColumnDT('iPrimaryVoltage'))
    columns.append(ColumnDT('iSecondaryVoltage'))
    columns.append(ColumnDT('sTap'))
    columns.append(ColumnDT('decRatioA'))
    columns.append(ColumnDT('decExcitationA'))
    columns.append(ColumnDT('decDeviationA'))
    columns.append(ColumnDT('decRatioB'))
    columns.append(ColumnDT('decExcitationB'))
    columns.append(ColumnDT('decDeviationB'))
    columns.append(ColumnDT('decRatioC'))
    columns.append(ColumnDT('decExcitationC'))
    columns.append(ColumnDT('decDeviationC'))

    # defining the initial query depending on your purpose
    query = DBSession.query(TTransformerTurnsRatio)

    # instantiating a DataTable for the query and table needed
    rowTable = DataTables(request, TTransformerTurnsRatio, query, columns)

    # returns what is needed by DataTable
    return rowTable.output_result()

这是我的表格的html：

<table class="table" id="simple-example">
    <thead>
        <tr>
            <th>ID</th>
            <th>PV</th>
            <th>SV</th>
            <th>Tap</th>
            <th>Ratio A</th>
            <th>Excitation A</th>
            <th>Deviation A</th>
            <th>Ratio B</th>
            <th>Excitation B</th>
            <th>Deviation B</th>
            <th>Ratio C</th>
            <th>Excitation C</th>
            <th>Deviation C</th>
        </tr>
    </thead>
    <tbody></tbody>
</table>

修改

错误来自paging()中的datatables.py方法。

  File &#34;C:\Python27\lib\site-packages\datatables\datatables.py&#34;, line 102, in run
    self.paging()
  File &#34;C:\Python27\lib\site-packages\datatables\datatables.py&#34;, line 225, in paging
    if (self.request_values[&#39;iDisplayStart&#39;] != &#34;&#34; ) \
  File &#34;C:\Python27\lib\site-packages\webob-1.3.1-py2.7.egg\webob\multidict.py&#34;, line 99, in __getitem__
    raise KeyError(key)
KeyError: &#39;iDisplayStart&#39;

修改似乎在datatables.py中的if语句失败了：

def paging(self):
    """Construct the query, by slicing the results in order to limit rows showed on the page, and paginate the rest
    """
    pages = namedtuple('pages', ['start', 'length'])

if (self.request_values['iDisplayStart'] != "" ) \
    and (self.request_values['iDisplayLength'] != -1 ):
    pages.start = int(self.request_values['iDisplayStart'])
    pages.length = int(self.request_values['iDisplayLength'])

offset = pages.start + pages.length
self.query = self.query.slice(pages.start, offset)

在我看来，iDisplayStart＆＃39;不存在于GET请求字典

中

Answer 1

我说的是错误的路线...... 我不小心直接调用了该方法，而不是导航到包含ajax调用的页面

这些是我的路线：

config.add_route('simple_example', '/simple_example')
config.add_route('test', '/test')

@view_config(route_name='test', renderer='templates/main.html')
def test(request):
    partial = ["Custom/test.html"]
    return dict(partial=partial)

test是我的视图的路径，它返回包含表和数据表调用的html。相反，我一直调用127.0.0.1:1234/simple_example，这是将数据返回到表中的方法

没有＆＃39; iDisplayStart＆＃39; GET请求字典中的键

1 个答案: