urth-core-dataframe: polymer-mini.html: Uncaught TypeError: Cannot read property 'disconnect' of null

[peller]

When running the cells in this test, in order, the visual in the explorer fails to appear, apparently due to this exception from urth-core-dataframe.detached:

Uncaught TypeError: Cannot read property 'disconnect' of null
Polymer.Base.extend._cleanup    @   polymer-mini.html:1595
DomApi.EffectiveNodesObserver.removeListener    @   polymer-mini.html:1460
DomApi.unobserveNodes   @   polymer-mini.html:632
Polymer.Base.extend._cleanup    @   polymer-mini.html:1675
DomApi.EffectiveNodesObserver.removeListener    @   polymer-mini.html:1460
DomApi.unobserveNodes   @   polymer-mini.html:632
window.Urth.urth-core-dataframe.Polymer.detached    @   urth-core-dataframe.html:261
Polymer.Base._addFeature._invokeBehavior    @   polymer-micro.html:433
Polymer.Base._addFeature._doBehavior    @   polymer-micro.html:428
(anonymous function)    @   polymer-micro.html:217
Polymer.RenderStatus.whenReady  @   polymer-micro.html:103
Polymer.Base.detachedCallback   @   polymer-micro.html:215
(anonymous function)    @   jquery.min.js:5
x.extend.access @   jquery.min.js:4
x.fn.extend.html    @   jquery.min.js:5
OutputArea.clear_output @   outputarea.js:866
CodeCell.execute    @   codecell.js:313
Notebook.execute_cell_and_select_below  @   notebook.js:2177
_actions.run-cell-and-select-next.handler   @   actions.js:116
final_actions.(anonymous function).handler  @   actions.js:621
ActionHandler.call  @   actions.js:723
ShortcutManager.call_handler    @   keyboard.js:451
KeyboardManager.handle_keydown  @   keyboardmanager.js:172
(anonymous function)    @   keyboardmanager.js:136
x.event.dispatch    @   jquery.min.js:5
y.handle    @   jquery.min.js:5

Run the cell again, or run the notebook in a different order, and everything is ok. Only happens when the explore() call comes immediately after the table/query test. Probably has something to do with the incomplete/null attributes on the urth-core-query elements created by urth-viz-query

@lbustelo

[lbustelo]

Looking at the code in urth-core-dataframe.detached, don't see anything that jumps out. I looked at the relevant behaviors too.

[peller]

probably has something to do with the way I'm moving the query nodes around in the DOM with an appendChild() and the reference gets stale

[lbustelo]

I cannot reproduce this issue on master.

[peller]

yeah, sorry, it's with the new notebook, which lives in the declarativewidgets_explorer repo. For now, you can copy it over.

[lbustelo]

I'll try that... but that seems similar to what I tested.

[peller]

just tried it. I cannot reproduce the problem either.

[peller]

I had to run the explore() cell a second time to see it. Both times, the vega chart failed to appear.

[lbustelo]

@peller with the same error?

[lbustelo]

Can't test this due to https://github.com/jupyter-incubator/declarativewidgets_explorer/issues/24

[peller]

@lbustelo same error