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Migrated Scribe to a CARE App + Context (#8469)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,55 @@ | ||
| import { useEffect, useState } from "react"; | ||
|
|
||
| /** | ||
| * A custom React hook that observes changes to a specific attribute of a DOM element | ||
| * and returns a new value when the attribute changes. It is primarily useful | ||
| * for detecting updates to the value of a custom CUI component through layers where | ||
| * the component's state cannot be determined or mutated (example. CARE Scribe). | ||
| * | ||
| * @template T | ||
| * @param {Object} options - Configuration options for the observer. | ||
| * @param {HTMLElement | null} options.targetElement - The DOM element to observe for attribute changes. | ||
| * @param {string} [options.attribute="value"] - The name of the attribute to observe (default is "value"). | ||
| * | ||
| * @example | ||
| * const targetElement = document.getElementById('my-input'); | ||
| * const DOMValue = useValueInjectionObserver({ | ||
| * targetElement: targetElement, | ||
| * attribute: 'value', | ||
| * }); | ||
| * | ||
| * @returns {unknown} This hook returns the current value of the attribute. | ||
| */ | ||
| export function useValueInjectionObserver<T = unknown>(options: { | ||
| targetElement: HTMLElement | null; | ||
| attribute?: string; | ||
| }) { | ||
| const { targetElement, attribute = "value" } = options; | ||
| const [value, setValue] = useState<T>(); | ||
|
|
||
| useEffect(() => { | ||
| const observer = new MutationObserver((mutationsList) => { | ||
| mutationsList.forEach((mutation) => { | ||
| if ( | ||
| mutation.type === "attributes" && | ||
| mutation.attributeName === attribute | ||
| ) { | ||
| const newValue = JSON.parse( | ||
| targetElement?.getAttribute(attribute) || '""', | ||
| ); | ||
| setValue(newValue); | ||
| } | ||
| }); | ||
| }); | ||
|
|
||
| const config = { | ||
| attributes: true, | ||
| attributeFilter: [attribute], | ||
| }; | ||
|
|
||
| targetElement && observer.observe(targetElement, config); | ||
| return () => observer.disconnect(); | ||
| }, [targetElement]); | ||
|
|
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| return value; | ||
| } |
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