widget - 如何使用 ipython 中的按钮获取小部件值

Question

我有一个函数 createWidgets，其目的是获取一个字符串列表并为每个字符串创建一个容器列表 -> 1 个容器 = 一个文本框和一个复选框。然后将每个容器放入一个大容器中。

我想做的是在容器上附加一个按钮，on_click 获取所有“True”并将所有修改后的字符串放入数据框中

    widgelist = e.options
    txtBox_type = 'text_widget' # Define if Area box o regular txtbox
    bigContainer = createWidgets(widgelist, txtBox_type)

    Function
    def createWidgets(widgelist, txtBox_type):

        #containerList = []
        i = 0

        for k in widgelist:
        ## Build Container widgets

           chBox_Widget = widgets.CheckboxWidget(description = str(i),value = False,)
           if txtBox_type == 'textA_widget': # Check wether txtBox should be an area txt box or not.
               txt_Widget = widgets.TextareaWidget( description = str(i), value = k)
           else:
               txt_Widget = widgets.TextWidget( description = str(i), value = k)

        container = widgets.ContainerWidget()
        container.children = [chBox_Widget, txt_Widget]
        containerList.append(container)

        i+= 1

        button = widgets.ButtonWidget(description = 'Add')
        bigContainer = widgets.ContainerWidget()
        bigContainer.children = containerList

        return  bigContainer

我访问了很多网站并花了很多天的时间在这个帮助上非常感谢

Answer 1

就我所能解释的问题而言，下面的代码应该提供答案:

import IPython.html.widgets as widgets
from IPython.display import display, clear_output
import pandas as pd

df = pd.DataFrame(columns=['Thing'])

def createWidgets(widgelist):

    ## Each CheckboxWidget and TextWidget are enclosed in a subwidget.  We use a 
    ## list comprehension to construct a list of these subwidgets.
    containerList = [
        widgets.ContainerWidget(children=(widgets.CheckboxWidget(description=k)
                                          widgets.TextWidget(value=k)))
        for k in widgelist]
    bigContainer = widgets.ContainerWidget(children=containerList)

    ## To arrange the CheckboxWidget in a row with the TextWidget, we have to
    ## first display them, then remove_class('vbox') and add_class('hbox'). This 
    ## bit of awkwardness in the IPython version 2.x notebook will hopefully 
    ## be fixed in version 3.x.  Displaying bigContainer also displays it's children.
    display(bigContainer)
    for c in containerList:
        c.remove_class('vbox')
        c.add_class('hbox')

    return  bigContainer

widgelist = ['ThingA', 'ThingB', 'ThingC', 'ThingD']
bigContainer = createWidgets(widgelist, txtBox_type)

## Callback for button.on_click.
def add_to_dataframe(a):
    # The children of bigContainer are also containers,
    # each with first child a CheckboxWidget and second
    # child a TextWidget.  We iterate through them and
    # if checked, add the text to the dataframe df as
    # an additional row.
    for c in bigContainer.children:
        if c.children[0].value:
            df.loc[len(df)+1] = (c.children[1].value,)
            display(df)

    clear_output()
    display(df)

button = widgets.ButtonWidget(description = 'Add')
button.on_click(add_to_dataframe)

display(button)

这是向数据框添加几行后小部件区域和输出的屏幕截图。

我会设计代码以稍微不同的方式来执行此操作，但我试图保持靠近您的代码组织。