Widget Exercises

Widget basics

Displaying a widget

Create and display a Text widget. Change that widget's value and some of it's other properties. Discover the other properties by querying the keys property of the instance.

Hint: You'll need to import from IPython.html.widgets and IPython.display.


In [ ]:
%load soln/displaying.py

Widget list

Selection widget

Create and display one of the selection widgets (dropdown, select, radiobuttons, or togglebuttons). Use the dictionary syntax to set the list of possible values. The values should be "Left" = 0, "Center" = 1, and "Right" = 2. Try reading and setting the value programmatically.


In [ ]:
%load soln/selection.py

Use a link to link the values of a Textarea widget and, an HTML or Latex widget. Display the widgets and try typing Latex and HTML in the textarea.

Hint: Look at the Widget Basics notebook for an example of how to use link.


In [ ]:
%load soln/link.py

Widget events

on_submit event

Create and display a Text widget. Use the on_submit event to print the value of the textbox just before you clear the textbox.

Hint: The on_submit callback must accept one argument, the sender.


In [ ]:
%load soln/on_submit.py

on_trait_change event

Create and display a Text widget. Use the on_trait_change method to register a callback that prints the value of the textbox without clearing it. Observe the difference in behavior to Exercise 1.


In [ ]:
%load soln/on_trait_change.py

Widget styling

Colored text

Create and display an HTML widget with a value of your choice (i.e. "Hello World"). Use its attributes to change that widget's background color and font color.


In [ ]:
%load soln/colored.py

Vertical sliders

Create an array of 10 or more vertical sliders. Align the sliders using a container so they look like an equalizer.

Hint: Refer to the Widget List notebook for an example of how to display a vertical slider.


In [ ]:
%load soln/sliders.py