python - Bokeh:显示用户输入的文本

Question

我正在尝试弄清楚如何使用 Bokeh 显示用户的输入。示例代码如下。任何指示将不胜感激。

谢谢

from bokeh.layouts import widgetbox
from bokeh.models import CustomJS, TextInput, Paragraph
from bokeh.plotting import output_file, show

# SAVE
output_file('Sample_Application.html',mode='inline',root_dir=None)

# PREP DATA
welcome_message = 'You have selected: (none)'

# CALLBACKS
def callback_print(source=None, window=None):
    user_input = str(cb_obj.value)
    welcome_message = 'You have selected: ' + user_input
    source.trigger('change')

# TAKE ONLY OUTPUT
text_banner = Paragraph(text=welcome_message, width=200, height=100)

# USER INTERACTIONS
text_input = TextInput(value="", title="Enter row number:",             
callback=CustomJS.from_py_func(callback_print))

# LAYOUT
widg = widgetbox(text_input, text_banner)
show(widg)

Answer 1

有几个问题，您需要实际将文本横幅对象传递到 python 回调中，并将文本属性更新为新字符串。

当前您正在传递未定义的“source”并试图触发更改。通常，当您更改源数据并将其更新为显示在表格或绘图等上时，您会执行此操作...

包含在必要的修复下面

from bokeh.layouts import widgetbox
from bokeh.models import CustomJS, TextInput, Paragraph
from bokeh.plotting import output_file, show

# SAVE
output_file('Sample_Application.html',mode='inline',root_dir=None)

# PREP DATA
welcome_message = 'You have selected: (none)'

# TAKE ONLY OUTPUT
text_banner = Paragraph(text=welcome_message, width=200, height=100)

# CALLBACKS
def callback_print(text_banner=text_banner):
    user_input = str(cb_obj.value)
    welcome_message = 'You have selected: ' + user_input
    text_banner.text = welcome_message

# USER INTERACTIONS
text_input = TextInput(value="", title="Enter row number:",             
callback=CustomJS.from_py_func(callback_print))

# LAYOUT
widg = widgetbox(text_input, text_banner)
show(widg)