v1.0.0-alpha.2: Uncaught TypeError: Cannot read property '__vfrag__' of null

[humanismusic]

Update: Reproduction here

Occurring when dragging a list item from one unordered list to another - in this case when using RubaXa/Sortable to manage lists.

Appears to be caused by the location of the comment node after items are moved, according to comments under #437 - typeError 'Cannot read property 'vue' of null'. That similar issue was closed as could not be reproduced.

Billiam later provided more details as well as a jsfiddle example.

Now that v1.0.0 uses 'v-for' instead of 'v-repeat' it generates the error: Cannot read property 'vfrag' of null.

[yyx990803]

Can you provide a repro using 1.0.0-alpha.2?

[humanismusic]

Sure thing. Repro created here

[humanismusic]

Spent more time on this and don't think it's due to the comment issue that affected #437. Looks like comment nodes are not output in the DOM in Vue 1.0.0 when using v-for, as far as I can tell.

So issue is caused by something else that I can't seem to resolve.

[yyx990803]

Ok, so in 0.12, the anchor nodes for v-repeat will be an empty textNode in normal mode, and comment node in debug mode. So the code that hacks around comment nodes should also check for empty textNodes: http://jsfiddle.net/64scphgn/5/

[humanismusic]

Thanks for the info however this doesn't resolve the issue. If you walk through the reproduction steps in your updated Fiddle the 'Cannot read property '__vfrag__' of null error still appears.

Note that this only happens after dragging between two lists like in example, dragging within a list appears to be OK. Any ideas?