Action Button

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import param
import panel as pn

pn.extension(sizing_mode="stretch_width")

param.Action Example

This example demonstrates how to use param.Action to trigger an update in a method that depends on that parameter. Actions can trigger any function, but if we simply want to trigger a method that depends on that action, then we can define a small lambda function that triggers the parameter explicitly.

class ActionExample(param.Parameterized):
    """
    Demonstrates how to use param.Action to trigger an update.
    """

    action = param.Action(lambda x: x.param.trigger('action'), label='Click here!')
    
    number = param.Integer(default=0)
        
    @param.depends('action')
    def get_number(self):
        self.number += 1
        return self.number
    
action_example = ActionExample()
component = pn.Column(
    pn.Row(
        pn.Column(pn.panel(action_example, show_name=False, margin=0, widgets={"action": {"button_type": "primary"}, "number": {"disabled": True}}),
            '**Click the button** to trigger an update in the output.'),
        pn.panel(action_example.get_number, width=300), max_width=600)
)
component

App

Lets wrap it into nice template that can be served via panel serve action_button.ipynb

pn.template.FastListTemplate(
    site="Panel", title="param.Action Example", 
    main=[
        "This example demonstrates **how to use ``param.Action`` to trigger an update** in a method that depends on that parameter.\n\nActions can trigger any function, but if we simply want to trigger a method that depends on that action, then we can define a small ``lambda`` function that triggers the parameter explicitly.",
        component,
    ]
).servable();

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.

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