fix: dynamically setting options sets undefined to select value #655
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Approach
====
Without this change, the `Select` component doesn't know the `Options`
(items in the internal `List` component) after `onMount`. So it can't tell
which `Option`s are added/removed.
To fix the root cause, I created a new events to `List`: `SMUIList:mountItem`
and `SMUIList:unmountItem`, which tells the parent when some of its children
are added or removed. Then, I implemented an event handler of `Select` for the
new events to update the internal list and call `layoutOptions`. `layoutOptions`
should always be called whenever the options are updated
Another Option
====
The change might be simpler adding `bind:accessor={list}` to the `List`. But I
didn't choose it because `List` seems to want to hide its `accessor` as the
implementation details. I'll rewrite if you prefer.
Ref: hperrin#538.
Ref: https://discord.com/channels/833139170703704115/1228040959670091787
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Approach
Without this change, the
Selectcomponent doesn't know theOptions(items in the internalListcomponent) afteronMount. So it can't tell whichOptions are added/removed.To fix the root cause, I created a new events to
List:SMUIList:mountItemandSMUIList:unmountItem, which tells the parent when some of its children are added or removed. Then, I implemented an event handler ofSelectfor the new events to update the internal list and calllayoutOptions.layoutOptionsshould always be called whenever the options are updated (Ref. https://github.com/material-components/material-components-web/blob/f80ac92b08dfa1b59cd9faf74f3d19a4b134993e/packages/mdc-select/foundation.ts#L235-L239.Another Option
The change might be simpler adding
bind:accessor={list}to theList. But I didn't choose it becauseListseems to want to hide itsaccessoras the implementation details. I'll rewrite to try if you prefer.