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chore(docs): add implemetation note on auto-height textarea (closes #3702) #3725

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Jul 21, 2019
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chore(docs): add implemetation note on auto-height textarea (closes #3702) #3725

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chore(docs): add implemetation note on auto-height textarea (closes #…
tmorehouse Jul 21, 2019
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Update README.md
tmorehouse Jul 21, 2019
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11 changes: 11 additions & 0 deletions src/components/form-textarea/README.md
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Expand Up @@ -168,6 +168,17 @@ disabled in auto-height mode.
<!-- b-form-textarea-auto-height.vue -->
```


#### Auto height implementation note

Auto-height works by computing the resulting height via CSS queries, hence the input has to be in
document (DOM) and visible (not hidden via `display: none`). Initial height is computed on mount. If
the `b-form-text-area` is visually hidden on mount, the auto height cannot be computed.

In situations where the text area may initially be hidden visually (i.e. in non-lazy `b-tab` components
or non-lazy static `b-modal`), you may want to use `v-if` to delay mouting (lazy mount), or delay setting
the value of `b-form-textarea` until it's visually hidden parent is shown.

## Contextual states

Bootstrap includes validation styles for `valid` and `invalid` states on most form controls.
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