partial.update_content() not updating as expected

[chrisOnWheels]

Description I expected partial.update_content() to immediately change a partial, which would allow for a dynamic element. In a callback there is immediate reaction to changes in the bound variables, but partial.update_content() seems to execute after the callback has finished. This leads to a raised exception in the example.

How to reproduce

import taipy as tp


def make_partial(state):
    state.my_partial.update_content(state, """<|empty|>""")

    if state.select == "with Y":
        state.data_for_display = state.data
    else:
        state.data_for_display = state.data2

    content = """<|
"""
    for key in state.data_for_display.keys():
        content = (
            content + key + """ = <|{data_for_display['""" + key + """']}|><br />"""
        )
    content = (
        content
        + """
|>"""
    )

    state.my_partial.update_content(state, content)


if __name__ == "__main__":
    data = {"x": "X", "y": "Y"}
    data2 = {"x": "X"}

    data_for_display = data
    select = 1

    gui = tp.Gui()
    gui.add_page(
        "page",
        page="""
<|selector|value={select}|lov={['with Y','Exception without Y']}|adapter={lambda i: str(i)}|on_change=make_partial|>
<br />
<|part|partial={my_partial}|>  
""",
    )

    my_partial = gui.add_partial(page="""""")

    tp.run(gui)

[FredLL-Avaiga]

partial update is asynchronous by design

[FredLL-Avaiga]

you could add a bit of test in your expression to avoid the exception

from taipy.gui import Gui


def make_partial(state):
    state.my_partial.update_content(state, "<|empty|>")

    if state.select == "with Y":
        state.data_for_display = state.data
    else:
        state.data_for_display = state.data2

    content = """<|
"""
    for key in state.data_for_display.keys():
        content = f"{content}{key} = <|{{data_for_display['{key}'] if '{key}' in data_for_display else ''}}|><br />"
    content += """
|>"""

    state.my_partial.update_content(state, content)


if __name__ == "__main__":
    data = {"x": "X", "y": "Y"}
    data2 = {"x": "X"}

    data_for_display = data
    select = None

    gui = Gui()
    gui.add_page(
        "page",
        page="""
<|selector|value={select}|lov=with Y;Exception without Y|on_change=make_partial|>
<br />
<|part|partial={my_partial}|>
""",
    )

    my_partial = gui.add_partial(page="")

    gui.run()

[FredLL-Avaiga]

Does that answer your question @chrisOnWheels ?

[chrisOnWheels]

Hi Fred,

this is exactly what I'm doing. Change the underlying data first, then rebuild/adapt the content for the partial, finally call update_partial. But I keep getting these exceptions. My only problem is that these exceptions spam the console.

Best regards, Chris

Fred Lefévère-Laoide @.***> hat am 14.09.2023 17:27 GMT geschrieben:

you could add a bit of test in your expression to avoid the exception

from taipy.gui import Gui

def make_partial(state): state.my_partial.update_content(state, "<|empty|>")

if state.select == "with Y": state.data_for_display = state.data else: state.data_for_display = state.data2

content = """<| """ for key in state.data_for_display.keys(): content = f"{content}{key} = <|{{data_for_display['{key}'] if '{key}' in data_for_display else ''}}|>
" content += """ |>"""

state.my_partial.update_content(state, content)

if name == "main": data = {"x": "X", "y": "Y"} data2 = {"x": "X"}

data_for_display = data select = None

gui = Gui() gui.add_page( "page", page=""" <|selector|value={select}|lov=with Y;Exception without Y|on_change=make_partial|>
<|part|partial={my_partial}|> """, )

my_partial = gui.add_partial(page="")

gui.run()

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[FredLL-Avaiga]

I don't get any exception with the code I provided. Can you give me some example ?

[chrisOnWheels]

I will try to isolate it, it's gonna take a while

Fred Lefévère-Laoide @.***> hat am 19.09.2023 07:47 GMT geschrieben:

I don't get any exception with the code provided. Can you give me some example ?

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[FredLL-Avaiga]

👍

[FredLL-Avaiga]

Hi @chrisOnWheels Is this issue still relevant ?

[chrisOnWheels]

I'll not be working on the project in the near future, so it's up to you. Thanks for the support :-)

[FabienLelaquais]

Here is a modified version of the code that works properly.

All I did was postpone the update of state.data_for_display until just before the partial gets updated. Please let us know if this works for you, so we can Close the issue with a smile on our faces.

import taipy as tp


def make_partial(state):
    state.my_partial.update_content(state, "<|empty|>")

    new_data = data if state.select == "with Y" else data2
    content = "<|\n"
    for key in new_data.keys():
        content = content + key + f" = <|{{data_for_display['{key}']}}|><br />\n"
    content = content + "|>"

    state.data_for_display = new_data
    state.my_partial.update_content(state, content)


data = {"x": "X", "y": "Y"}
data2 = {"x": "X"}

if __name__ == "__main__":

    data_for_display = data
    select = 1

    gui = tp.Gui()
    gui.add_page(
        "page",
        page="""
<|selector|value={select}|lov={['with Y','Exception without Y']}|adapter={lambda i: str(i)}|on_change=make_partial|>
<br />
<|part|partial={my_partial}|>  
""",
    )

    my_partial = gui.add_partial(page="<|empty|>")

    tp.run(gui)

[jrobinAV]

Closed as answered.