Plotly (Dash) tick label overwriting

I cannot get the following to plot the ticklabels

self.months = [2017-01-01', 2017-02-01', ...]    def plot_bar(self):         print self.data         app.layout = html.Div(children=[html.H1(children=''), html.Div(children='Discovered monthly'),         dcc.Graph(             figure=go.Figure(             data = self.data,             layout=go.Layout(                 title='Streams', showlegend=True, barmode='stack', margin=go.Margin(l=200, r=0, t=40, b=20),                 xaxis=dict(tickvals = self.months, ticktext = self.months, title='months')                 )             ),         style={'height': 300},         id='my-graph')         ]) 

So basically I have a numerical representation of the a bar chart, however when I change the tick values and ticklabels, those numerical labels dissappear, however I do not see the dates that I would be expected to be there. Am I missing a switch to display these labels?

1 Answers

Answers 1

The tickvals need to be the actual values of the x-axis where your ticks shall be positioned, not the labels. Not knowing what your actual data looks like, here is an adjusted example with some made-up data:

self.months = ['2017-01-01', '2017-02-01', '2017-03-01'] self.data = [     {'x': [0, 1, 2], 'y': [4, 1, 2], 'type': 'bar', 'name': 'SF'},     {'x': [0, 1, 2], 'y': [2, 4, 5], 'type': 'bar', 'name': u'Montréal'}, ]  # X-Axis location for the ticks self.tickvals = [0, 1, 2]  def plot_bar(self):     app.layout = html.Div(children=[html.H1(children=''), html.Div(children='Discovered monthly'),                                     dcc.Graph(                                         figure=go.Figure(                                             data = self.data,                                             layout=go.Layout(                                                 title='Streams', showlegend=True, barmode='stack', margin=go.Margin(l=200, r=0, t=40, b=20),                                                 xaxis=dict(tickvals = self.tickvals, ticktext = self.months, title='months')                                             )                                         ),                                         style={'height': 300},                                         id='my-graph')                                     ]) 

Note how this maps 2017-01-01 to the corresponding value 0, 2017-02-01 to 1 and 2017-03-01 to 2 on the x-axis. I could have left out 2017-02-01 (and thus 1 in self.tickvals) in case that would produce too many labels or chosen arbitrary values here such as 1.5 to plot my labels. As we are talking about bar graphs, the latter example lacks a useful application.

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