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if binding evaluating to false delays invocation of koDescendantsComplete #414
Description
Migrating from knockout, I have component templates that have simple if binding checks like
<!-- ko if: showTabsList -->
if showTabsList is set to false, and we have a koDescendantsComplete() function, that function is never called. Only when showTabsList is set to true will koDescendantsComplete be called.
This appears to be similar behavior to knockout's completeOn: "render" option, but that's not what we want/need.
Is there any way to have koDescendantsComplete even when an if binding is bound to false?
Activity
brimimc commentedon Jul 8, 2026
This may be fixed in latest - will need to get a release to test with
brimimc commentedon Jul 16, 2026
Of note - we've found that the descendantsComplete binding handler applies TOO EARLY (before a child foreach has updated the DOM) - I'm not sure if the comment on the fix "Fix mirrors DescendantBindingHandler" if that will also be too early.
@phillipc any ideas when the next release will happen for me to test the updates? thanks
phillipc commentedon Jul 16, 2026
Hey @brimimc, i think the
DescendantsComplete-behavior is different in TKO.Properly you can switch to
childrenComplete: render, see here:tko/packages/binding.core/spec/descendantsCompleteBehaviors.ts
Line 118 in f396518
BTW: Have you already set the option
createChildContextWithAstofalsefor your migration project (see #191)?brimimc commentedon Jul 17, 2026
Interesting @phillipc ... switching from
descendantsCompletetochildrenCompletecould work for a single sub-component, but we have multiple and we need to wait for all of them to havechildrenCompletebefore invoking our logic.And yes we do have
ko.options.createChildContextWithAs = true;set.Any update on when the next release with koDescendantsComplete behavior fixes might be released?
phillipc commentedon Jul 18, 2026
I couldn't stop thinking about this either. I've implemented a solution that restores the KO behavior.
@brianmhunt , please take a look at this. -> #416