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feat(useTextDirection): new function (#1678)
Co-authored-by: Anthony Fu <anthonyfu117@hotmail.com>
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<script setup lang="ts"> | ||
import { computed, onUnmounted } from 'vue' | ||
import { useTextDirection } from './index' | ||
const dir = useTextDirection({ | ||
selector: '#_useTextDirectionDemo', | ||
}) | ||
const text = computed(() => | ||
dir.value === 'ltr' | ||
? 'This paragraph is in English and correctly goes left to right.' | ||
: 'This paragraph is in English but incorrectly goes right to left.', | ||
) | ||
const handleOnClick = () => { | ||
dir.value = dir.value === 'rtl' ? 'ltr' : 'rtl' | ||
} | ||
</script> | ||
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||
<template> | ||
<div id="_useTextDirectionDemo"> | ||
<p> | ||
{{ text }} | ||
</p> | ||
<hr> | ||
<button @click="handleOnClick"> | ||
<span class="ml-2">{{ dir.toUpperCase() }}</span> | ||
</button> | ||
<span class="p-4 opacity-50">Click to change the direaction</span> | ||
</div> | ||
</template> | ||
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||
<style scoped> | ||
#_useTextDirectionDemo[dir='rtl'] | ||
p { | ||
color: red; | ||
} | ||
button { | ||
margin-right: 0.5em; | ||
} | ||
</style> |
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--- | ||
category: Browser | ||
--- | ||
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# useTextDirection | ||
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Reactive [dir](https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/dir) of the element's text. | ||
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## Usage | ||
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```ts | ||
import { useTextDirection } from '@vueuse/core' | ||
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const dir = useTextDirection() // Ref<'ltr' | 'rtl' | 'auto'> | ||
``` | ||
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By default, it returns `rlt` direction when dir `rtl` is applied to the `html` tag, for example: | ||
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```html | ||
<!--ltr--> | ||
<html> ... </html> | ||
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<!--rtl--> | ||
<html dir="rtl"> ... </html> | ||
``` | ||
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## Options | ||
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```ts | ||
import { useTextDirection } from '@vueuse/core' | ||
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const mode = useTextDirection({ | ||
selector: 'body' | ||
}) // Ref<'ltr' | 'rtl' | 'auto'> | ||
``` |
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import { tryOnMounted } from '@vueuse/shared' | ||
import { computed, ref } from 'vue-demi' | ||
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import type { MaybeElement } from '../unrefElement' | ||
import { useMutationObserver } from '../useMutationObserver' | ||
import type { ConfigurableDocument } from '../_configurable' | ||
import { defaultDocument } from '../_configurable' | ||
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export type UseTextDirectionValue = 'ltr' | 'rtl' | 'auto' | ||
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export interface UseTextDirectionOptions extends ConfigurableDocument { | ||
/** | ||
* CSS Selector for the target element applying to | ||
* | ||
* @default 'html' | ||
*/ | ||
selector?: string | ||
/** | ||
* Observe `document.querySelector(selector)` changes using MutationObserve | ||
* | ||
* @default false | ||
*/ | ||
observe?: boolean | ||
/** | ||
* Initial value | ||
* | ||
* @default 'ltr' | ||
*/ | ||
initialValue?: UseTextDirectionValue | ||
} | ||
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/** | ||
* Reactive dir of the element's text. | ||
* | ||
* @see https://vueuse.org/useTextDirection | ||
*/ | ||
export function useTextDirection(options: UseTextDirectionOptions = {}) { | ||
const { | ||
document = defaultDocument, | ||
selector = 'html', | ||
observe = false, | ||
initialValue = 'ltr', | ||
} = options | ||
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function getValue() { | ||
return document?.querySelector(selector)?.getAttribute('dir') as UseTextDirectionValue ?? initialValue | ||
} | ||
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const dir = ref<UseTextDirectionValue>(getValue()) | ||
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tryOnMounted(() => dir.value = getValue()) | ||
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if (observe && document) { | ||
useMutationObserver( | ||
document.querySelector(selector) as MaybeElement, | ||
() => dir.value = getValue(), | ||
{ attributes: true }, | ||
) | ||
} | ||
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return computed<UseTextDirectionValue>({ | ||
get() { | ||
return dir.value | ||
}, | ||
set(v) { | ||
dir.value = v | ||
if (!document) | ||
return | ||
if (dir.value) | ||
document.querySelector(selector)?.setAttribute('dir', dir.value) | ||
else | ||
document.querySelector(selector)?.removeAttribute('dir') | ||
}, | ||
}) | ||
} |