Panel: Enable setting the panel.Param name manually.

[MarcSkovMadsen]

My Pain

Sometimes I have a param.Parameterized class with a lot of parameters. For layout reasons I might split them up into multiple panel.Params. I would like to give these seperate names.

As far as I can see this is not supported by panel.Param.

Example

As you can see the name is MyComponent instead of the custom one specified.

import param
import panel as pn

class MyComponent(param.Parameterized):
    selection1 = param.ObjectSelector()
    selection2 = param.ObjectSelector()

component = MyComponent()
app = pn.Column(
    pn.Param(component, parameters=["selection1"], name="Primary Selections"),
    pn.Param(component, parameters=["selection2"], name="Secondary Selections"),
)
app.show()

Solution

Support this.

Workaround

As you can see below the layout is not nice. There is too much space (margin I guess) between things.

import param
import panel as pn

class MyComponent(param.Parameterized):
    selection1 = param.ObjectSelector()
    selection2 = param.ObjectSelector()

component = MyComponent()
app = pn.Column(
    pn.pane.Markdown("# Primary Selections"),
    pn.Param(component, parameters=["selection1"], show_name=False),
    pn.pane.Markdown("# Secondary Selections"),
    pn.Param(component, parameters=["selection2"], show_name=False),
)
app.show()

[maximlt]

It makes sense to support that I guess, I also encountered the same issue and used a similar workaround. I could give it a try since I've been working on param.py lately.

[maximlt]

@philippjfr Does it make sense to you if I explicitly add a name parameter to panel.Param ?

It could be:

• set to whatever the user wants even if the keyword argument parameters isn't used such as with pn.Param(MyComponent(name="A name"), name="Another name") that would display Another name as a title
• set to object.name (how the title is currently determined) if the user doesn't provide name

Note that it would break the following test since the default name would no longer be ParamXXXXX:
https://github.com/holoviz/panel/blob/65fb0fba1287ca8bd9ebbbcfd6b918e30742dea3/panel/tests/test_param.py#L103

[philippjfr]

Yes, I absolutely think that makes sense.