List header filter fails to find matching rows in 1.5.0

[bbercoviciUspace]

ALL software version info

• panel 1.5.0 pyhd8ed1ab_0
• python 3.10.*

Description of expected behavior and the observed behavior

The list header filters are no longer working. Instead of extracting the relevant rows, filling the filter empties the panel and triggers a warning in the browser console. This issue manifested itself after upgrading from 1.4.5 to 1.5.0.

Complete, minimal, self-contained example code that reproduces the issue

Column header filters defined as list filters, such as the following applied to the processName column

"processName": {
                "type": "list",
                "valuesLookup": True,
}

are not working properly in 1.5.0.

Stack traceback and/or browser JavaScript console output

Screenshots or screencasts of the bug in action

1.4.5 : the filter extracts the expected rows

No warning is shown in the inspect window

1.5.0 : the filter clears the entire table although there are rows matching the pattern in the dataset.

The inspect window shows the following warning :

[Coderambling]

Could you add your code to the issue so there is an MRE that can be tested easily?

[bbercoviciUspace]

I think I found a fix while trying to come up with a minimum example:

import panel as pn
import pandas as pd
import string

filters = {
            "field_A": {
                "type": "list",
                "valuesLookup": True,
                "placeholder" : "list"
            },
            "field_B": {
                "type": "input",
                "placeholder" : "input"

            }
            }

data = list()
for i in range(100):
    data.append(dict(field_A = string.ascii_lowercase[i % len(string.ascii_lowercase)], field_B = string.ascii_lowercase[(i + 3) % len(string.ascii_lowercase)]))

dataframe = pd.DataFrame(data)
panel_args = dict(value = dataframe,layout="fit_data_table", header_filters=filters)
tabulator = pn.widgets.Tabulator(**panel_args)
tabulator.save("test_panel.html")

The above script produced the attached test_panel_buggy.html file

test_panel_buggy.zip

For reasons beyond my understanding, adding the func : "like" to the list typed header filters brings back the search results

import panel as pn
import pandas as pd
import string

filters = {
            "field_A": {
                "type": "list",
                "func": "like",
                "valuesLookup": True,
                "placeholder" : "list"
            },
            "field_B": {
                "type": "input",
                "placeholder" : "input"

            }
            }

data = list()
for i in range(100):
    data.append(dict(field_A = string.ascii_lowercase[i % len(string.ascii_lowercase)], field_B = string.ascii_lowercase[(i + 3) % len(string.ascii_lowercase)]))
dataframe = pd.DataFrame(data)
panel_args = dict(value = dataframe,layout="fit_data_table",header_filters=filters)
tabulator = pn.widgets.Tabulator(**panel_args)
tabulator.save("test_panel.html")

test_panel_fixed.zip

I'm positive that this fix became necessary sometime around when panel 1.5.0 rolled out.

[Coderambling]

Good find!