Update Accordion
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@ -3,43 +3,45 @@ title: Accordion
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tags: components,children,state,advanced
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---
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Renders an accordion menu with multiple collapsible content components.
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Renders an accordion menu with multiple collapsible content elements.
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- Define an `AccordionItem` component, pass it to the `Accordion` and remove unnecessary nodes expect for `AccordionItem` by identifying the function's name in `children`.
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- Each `AccordionItem` component renders a `<button>` that is used to update the `Accordion` via the `handleClick` callback and the content of the component, passed down via `children`, while its appearance is determined by `isCollapsed` and based on `style`.
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- In the `Accordion` component, use the `React.useState()` hook to initialize the value of the `bindIndex` state variable to `defaultIndex`.
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- Define an `AccordionItem` component, that renders a `<button>` which is used to update the component and notify its parent via the `handleClick` callback.
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- Use the `isCollapsed` prop in `AccordionItem` to determine its appearance and set an appropriate `className`.
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- Define an `Accordion` component that uses the `useState()` hook to initialize the value of the `bindIndex` state variable to `defaultIndex`.
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- Filter `children` to remove unnecessary nodes expect for `AccordionItem` by identifying the function's name.
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- Use `Array.prototype.map()` on the collected nodes to render the individual collapsiple elements.
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- Define `changeItem`, which will be executed when clicking an `AccordionItem`'s `<button>`.
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`changeItem` executes the passed callback, `onItemClick` and updates `bindIndex` based on the clicked element.
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- `changeItem` executes the passed callback, `onItemClick`, and updates `bindIndex` based on the clicked element.
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```css
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.accordion-item.collapsed {
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display: none;
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}
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.accordion-item.expanded {
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display: block;
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}
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.accordion-button {
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display: block;
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width: 100%;
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}
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```
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```jsx
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const AccordionItem = ({ label, isCollapsed, handleClick, children }) => {
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const style = {
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collapsed: {
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display: 'none'
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},
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expanded: {
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display: 'block'
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},
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buttonStyle: {
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display: 'block',
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width: '100%'
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}
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};
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return (
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<div>
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<button style={style.buttonStyle} onClick={handleClick}>
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<>
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<button className="accordion-button" onClick={handleClick}>
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{label}
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</button>
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<div
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className="collapse-content"
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style={isCollapsed ? style.collapsed : style.expanded}
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className={`accordion-item ${isCollapsed ? 'collapsed' : 'expanded'}`}
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aria-expanded={isCollapsed}
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>
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{children}
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</div>
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</div>
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</>
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);
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};
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@ -53,7 +55,7 @@ const Accordion = ({ defaultIndex, onItemClick, children }) => {
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const items = children.filter(item => item.type.name === 'AccordionItem');
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return (
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<div className="wrapper">
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<>
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{items.map(({ props }) => (
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<AccordionItem
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isCollapsed={bindIndex !== props.index}
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@ -62,7 +64,7 @@ const Accordion = ({ defaultIndex, onItemClick, children }) => {
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children={props.children}
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/>
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))}
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</div>
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</>
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);
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};
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```
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