我正在为我的案例调整这个答案,我想要一个交互式的独立图表,其中滑块选择要在条形图中绘制的数据列。(独立是至关重要的,我无法运行 Bokeh 服务器,因此需要JavaScript 回调。)
数据是一个浮点矩形,38 列中的每一列都有 100 行,它们都有字符串标签等'40'
。(这是 pandas.read_csv()
默认处理标题中的数字的方式。)这是左上角的示例(3x3 ,加上行和列标签):
# , 40, 41, 42,
1.00000, 1.00000, 0.99287, 0.98489,
2.00000, 1.00000, 0.99348, 0.98626,
3.00000, 1.00000, 0.99433, 0.98922,
下面的代码为第一列生成图表,但在移动滑块时不会更新图表。
通过戳它,我怀疑问题出在 JavaScript 代码上,尽管ColumnDataSource对我来说仍然有点神秘。(一个更直接的数字列标签字典到列中的数字列表不起作用datasource_available
,尽管对应于链接答案的用例。)
datadf = pd.read_csv('male_survival_by_pctile.csv')
datadf.set_index('# ',inplace=True)
years = range(40,77)
data = {}
data_available = {}
for year in years:
data[year] = {'top':datadf[str(year)],'x':range(1,101)}
data_available = ColumnDataSource.from_df(datadf)
from bokeh.core.properties import field
from bokeh.io import curdoc, output_notebook, show
from bokeh.layouts import layout, column
from bokeh.models import (ColumnDataSource, HoverTool, SingleIntervalTicker,
Slider, Button, Label, CustomJS)
from bokeh.plotting import figure
output_notebook()
source_visible = ColumnDataSource(data=dict(x=range(1,101),top=data_available[str(years[0])]))
source_available = ColumnDataSource(data=data_available)
plot = figure(output_backend="webgl")
plot.xaxis.ticker = SingleIntervalTicker(interval=.01)
plot.xaxis.axis_label = "Income percentile"
plot.yaxis.ticker = SingleIntervalTicker(interval=.05)
plot.yaxis.axis_label = "Survival rate"
label = Label(x=1.1, y=18, text=str(years[0]), text_font_size='70pt', text_color='#eeeeee')
plot.add_layout(label)
plot.vbar(top='top',x='x',width=1,source=source_visible)
slider = Slider(start=years[0], end=years[-1], value=years[0], step=1, title="Age")
slider.callback = CustomJS(
args=dict(source_visible=source_visible,
source_available=source_available), code="""
var selected_function = cb_obj.get('value').toString();
// Get the data from the data sources
var data_visible = source_visible.get('data');
var data_available = source_available.get('data');
// Change bar height to the selected value
data_visible.top = data_available[selected_function];
// Update the plot
source_visible.trigger('change');
""")
layout = column(slider, plot)
show(layout)