Uncaught TypeError: Cannot read properties of undefined (reading 'header')

Question

[enter image description here](https://i.sstatic.net/DIyLN.png)

app.js:213 Uncaught TypeError: Cannot read properties of undefined (reading 'header')
    at getSlot (vuedraggable.js:59:1)
    at computeChildrenAndOffsets (vuedraggable.js:65:1)
    at Proxy.render (vuedraggable.js:163:1)
    at renderComponentRoot (runtime-core.esm-bundler.js:820:1)
    at ReactiveEffect.componentUpdateFn [as fn] (runtime-core.esm-bundler.js:5749:1)
    at ReactiveEffect.run (reactivity.esm-bundler.js:178:1)
    at instance.update (runtime-core.esm-bundler.js:5862:1)
    at setupRenderEffect (runtime-core.esm-bundler.js:5870:1)
    at mountComponent (runtime-core.esm-bundler.js:5660:1)
    at processComponent (runtime-core.esm-bundler.js:5613:1)

Please edit your question and include the relevant code as formatted text not images — yoduh
– yoduh, Commented Nov 23, 2023 at 2:50
also add information on relevant libraries and versions being used. an explanation of your code and what you're trying to do and what you think caused the error wouldn't hurt either. — yoduh
– yoduh, Commented Nov 23, 2023 at 2:52

richardj · Accepted Answer · 2023-11-24 10:11:53Z

1

With not enough information to be fully sure, it seems like you are using a version of the vuedraggable library that is not fully compliant with Vue3.

The issue you are describing comes forward searching for it (https://github.com/SortableJS/Vue.Draggable/issues/1184), the maintainers of the vuedraggable component are advising to use https://github.com/SortableJS/vue.draggable.next with Vue3.

answered Nov 24, 2023 at 10:11

richardj

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