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import panel as pn

The Button widget allows triggering events when the button is clicked. In addition to a value parameter, which will toggle from False to True while the click event is being processed an additional clicks parameter that can be watched to subscribe to click events.

For more information about listening to widget events and laying out widgets refer to the widgets user guide. Alternatively you can learn how to build GUIs by declaring parameters independently of any specific widgets in the param user guide. To express interactivity entirely using Javascript without the need for a Python server take a look at the links user guide.


For layout and styling related parameters see the customization user guide.


  • clicks (int): Number of clicks (can be listened to)

  • value (boolean): Toggles from False to True while the event is being processed.


  • button_type (str): A button theme; should be one of 'default' (white), 'primary' (blue), 'success' (green), 'info' (yellow), 'light' (light), or 'danger' (red)

  • disabled (boolean): Whether the widget is editable

  • name (str): The title of the widget

button = pn.widgets.Button(name='Click me', button_type='primary')

The clicks parameter will report the number of times the button has been pressed:


The on_click method can trigger function when button is clicked:

text = pn.widgets.TextInput(value='Ready')

def b(event):
    text.value = 'Clicked {0} times'.format(button.clicks)
pn.Row(button, text)

The Button name string may contain Unicode characters, providing a convenient way to define common graphical buttons:

backward = pn.widgets.Button(name='\u25c0', width=50)
forward = pn.widgets.Button(name='\u25b6', width=50)
search = pn.widgets.Button(name='🔍', width=100)

pn.Row(backward, forward, search)

The color of the button can be set by selecting one of the available button types:

pn.Column(*(pn.widgets.Button(name=p, button_type=p) for p in pn.widgets.Button.param.button_type.objects))


The Button widget exposes a number of options which can be changed from both Python and Javascript. Try out the effect of these parameters interactively:

pn.Row(button.controls, button)
This web page was generated from a Jupyter notebook and not all interactivity will work on this website. Right click to download and run locally for full Python-backed interactivity.

Download this notebook from GitHub (right-click to download).