{ "data": [ { "id": "Accordion", "title": "Accordion", "type": "snippet", "attributes": { "fileName": "Accordion.md", "text": "Renders an accordion menu with multiple collapsible content components.\n\n- Define an `AccordionItem` component, pass it to the `Accordion` and remove unnecessary nodes expect for `AccordionItem` by identifying the function's name in `props.children`.\n- Each `AccordionItem` component renders a `\r\n \r\n {props.children}\r\n \r\n \r\n );\r\n}\r\n\r\nfunction Accordion(props) {\r\n const [bindIndex, setBindIndex] = React.useState(props.defaultIndex);\r\n\r\n const changeItem = itemIndex => {\r\n if (typeof props.onItemClick === 'function') props.onItemClick(itemIndex);\r\n if (itemIndex !== bindIndex) setBindIndex(itemIndex);\r\n };\r\n const items = props.children.filter(item => item.type.name === 'AccordionItem');\r\n\r\n return (\r\n
\r\n {items.map(({ props }) => (\r\n changeItem(props.index)}\r\n children={props.children}\r\n />\r\n ))}\r\n
\r\n );\r\n}", "example": "ReactDOM.render(\r\n \r\n \r\n Lorem ipsum\r\n \r\n \r\n Dolor sit amet\r\n \r\n ,\r\n document.getElementById('root')\r\n);" }, "tags": [ "visual", "children", "state", "advanced" ] }, "meta": { "hash": "0300c924ea29110f2982ae5564a63ff01519a5d0ffc8ae6dc8d175363fb77534" } }, { "id": "AutoLink", "title": "AutoLink", "type": "snippet", "attributes": { "fileName": "AutoLink.md", "text": "Renders a string as plaintext, with URLs converted to appropriate `` elements.\n\n- Use `String.prototype.split()` and `String.prototype.match()` with a regular expression to find URLs in a string.\n- Return a `` with matched URLs rendered as `` elements, dealing with missing protocol prefixes if necessary, and the rest of the string rendered as plaintext.\n\n", "codeBlocks": { "style": "", "code": "function AutoLink({ text }) {\r\n const delimiter = /((?:https?:\\/\\/)?(?:(?:[a-z0-9]?(?:[a-z0-9\\-]{1,61}[a-z0-9])?\\.[^\\.|\\s])+[a-z\\.]*[a-z]+|(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)(?:\\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3})(?::\\d{1,5})*[a-z0-9.,_\\/~#&=;%+?\\-\\\\(\\\\)]*)/gi;\r\n\r\n return (\r\n \r\n {text.split(delimiter).map(word => {\r\n let match = word.match(delimiter);\r\n if (match) {\r\n let url = match[0];\r\n return {url};\r\n }\r\n return word;\r\n })}\r\n \r\n );\r\n}", "example": "ReactDOM.render(\r\n ,\r\n document.getElementById('root')\r\n);" }, "tags": [ "string", "fragment", "regexp", "advanced" ] }, "meta": { "hash": "8a4373d9d191111ec6644ca315399c78d48c4d1a8c29124e48a88741ef826bea" } }, { "id": "Carousel", "title": "Carousel", "type": "snippet", "attributes": { "fileName": "Carousel.md", "text": "Renders a carousel component.\n\n- Use the `React.setState()` hook to create the `active` state variable and give it a value of `0` (index of the first item).\n- Use an object, `style`, to hold the styles for the individual components.\n- Use the `React.setEffect()` hook to update the value of `active` to the index of the next item, using `setTimeout`.\n- Destructure `props`, compute if visibility style should be set to `visible` or not for each carousel item while mapping over and applying the combined style to the carousel item component accordingly.\n- Render the carousel items using `React.cloneElement()` and pass down rest `props` along with the computed styles.\n\n", "codeBlocks": { "style": "", "code": "function Carousel(props) {\r\n const [active, setActive] = React.useState(0);\r\n let scrollInterval = null;\r\n const style = {\r\n carousel: {\r\n position: 'relative'\r\n },\r\n carouselItem: {\r\n position: 'absolute',\r\n visibility: 'hidden'\r\n },\r\n visible: {\r\n visibility: 'visible'\r\n }\r\n };\r\n React.useEffect(() => {\r\n scrollInterval = setTimeout(() => {\r\n const { carouselItems } = props;\r\n setActive((active + 1) % carouselItems.length);\r\n }, 2000);\r\n });\r\n const { carouselItems, ...rest } = props;\r\n return (\r\n
\r\n {carouselItems.map((item, index) => {\r\n const activeStyle = active === index ? style.visible : {};\r\n return React.cloneElement(item, {\r\n ...rest,\r\n style: {\r\n ...style.carouselItem,\r\n ...activeStyle\r\n }\r\n });\r\n })}\r\n
\r\n );\r\n}", "example": "ReactDOM.render(\r\n carousel item 1,\r\n
carousel item 2
,\r\n
carousel item 3
\r\n ]}\r\n />,\r\n document.getElementById('root')\r\n);" }, "tags": [ "visual", "children", "state", "effect", "intermediate" ] }, "meta": { "hash": "24c0b339ea3131a8bde8081b1f44caac1d5014ecc1ac6d25ebf4b14d053a83a8" } }, { "id": "Collapse", "title": "Collapse", "type": "snippet", "attributes": { "fileName": "Collapse.md", "text": "Renders a component with collapsible content.\n\n- Use the `React.setState()` hook to create the `isCollapsed` state variable with an initial value of `props.collapsed`.\n- Use an object, `style`, to hold the styles for individual components and their states.\n- Use a `
` to wrap both the `\r\n \r\n {props.children}\r\n
\r\n \r\n );\r\n}", "example": "ReactDOM.render(\r\n \r\n

This is a collapse

\r\n

Hello world!

\r\n ,\r\n document.getElementById('root')\r\n);" }, "tags": [ "visual", "children", "state", "intermediate" ] }, "meta": { "hash": "bb14a75971ab3a395e7a7e4458f636b9309f3e9a376494fe10b716be256bd9d2" } }, { "id": "ControlledInput", "title": "ControlledInput", "type": "snippet", "attributes": { "fileName": "ControlledInput.md", "text": "Renders an `` element with internal state, that uses a callback function to pass its value to the parent component.\n\n- Use object destructuring to set defaults for certain attributes of the `` element.\n- Use the `React.setState()` hook to create the `value` state variable and give it a value of equal to the `defaultValue` prop.\n- Use the `React.useEffect()` hook with a second parameter set to the `value` state variable to call the `callback` function every time `value` is updated.\n- Render an `` element with the appropriate attributes and use the the `onChange` event to upda the `value` state variable.\n\n", "codeBlocks": { "style": "", "code": "function ControlledInput({\r\n callback,\r\n type = 'text',\r\n disabled = false,\r\n readOnly = false,\r\n defaultValue,\r\n placeholder = ''\r\n}) {\r\n const [value, setValue] = React.useState(defaultValue);\r\n\r\n React.useEffect(() => {\r\n callback(value);\r\n }, [value]);\r\n\r\n return (\r\n setValue(value)}\r\n />\r\n );\r\n}", "example": "ReactDOM.render(\r\n console.log(val)}\r\n />,\r\n document.getElementById('root')\r\n);" }, "tags": [ "input", "state", "effect", "intermediate" ] }, "meta": { "hash": "a9c8332455bad3c81dd1dbaf7361b98406ed11eaa35e9be8e72e88d8139eb2d6" } }, { "id": "CountDown", "title": "CountDown", "type": "snippet", "attributes": { "fileName": "CountDown.md", "text": "Renders a countdown timer that prints a message when it reaches zero.\n\n- Use object destructuring to set defaults for the `hours`, `minutes` and `seconds` props.\n- Use the `React.useState()` hook to create the `time`, `paused` and `over` state variables and set their values to the values of the passed props, `false` and `false` respectively.\n- Create a method `tick`, that updates the value of `time` based on the current value (i.e. decreasing the time by one second).\n- If `paused` or `over` is `true`, `tick` will return immediately.\n- Create a method `reset`, that resets all state variables to their initial states.\n- Use the the `React.useEffect()` hook to call the `tick` method every second via the use of `setInterval()` and use `clearInterval()` to cleanup when the component is unmounted.\n- Use a `
` to wrap a `

` element with the textual representation of the components `time` state variable, as well as two `\r\n \r\n

\r\n );\r\n}", "example": "ReactDOM.render(, document.getElementById('root'));" }, "tags": [ "visual", "state", "advanced" ] }, "meta": { "hash": "b5ac7580e6a96df21478030c6c2b30fa2e56df2573ab66e2405bdbbdce60aa61" } }, { "id": "DataList", "title": "DataList", "type": "snippet", "attributes": { "fileName": "DataList.md", "text": "Renders a list of elements from an array of primitives.\n\n- Use the value of the `isOrdered` prop to conditionally render a `
    ` or `
      ` list.\n- Use `Array.prototype.map` to render every item in `data` as a `
    • ` element, give it a `key` produced from the concatenation of the its index and value.\n- Omit the `isOrdered` prop to render a `
        ` list by default.\n\n", "codeBlocks": { "style": "", "code": "function DataList({ isOrdered, data }) {\r\n const list = data.map((val, i) =>
      • {val}
        • );\r\n return isOrdered ?
          {list}
        :
          {list}
        ;\r\n}", "example": "const names = ['John', 'Paul', 'Mary'];\r\nReactDOM.render(, document.getElementById('root'));\r\nReactDOM.render(, document.getElementById('root'));" }, "tags": [ "array", "beginner" ] }, "meta": { "hash": "38eb402c926fbc919a04b55fe8d6fb2fbdd5ba54341783852f909f9181e745da" } }, { "id": "DataTable", "title": "DataTable", "type": "snippet", "attributes": { "fileName": "DataTable.md", "text": "Renders a table with rows dynamically created from an array of primitives.\n\n- Render a `` element with two columns (`ID` and `Value`).\n- Use `Array.prototype.map` to render every item in `data` as a `` element, consisting of its index and value, give it a `key` produced from the concatenation of the two.\n\n", "codeBlocks": { "style": "", "code": "function DataTable({ data }) {\r\n return (\r\n
        \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n {data.map((val, i) => (\r\n \r\n \r\n \r\n \r\n ))}\r\n \r\n
        IDValue
        {i}{val}
        \r\n );\r\n}", "example": "const people = ['John', 'Jesse'];\r\nReactDOM.render(, document.getElementById('root'));" }, "tags": [ "array", "beginner" ] }, "meta": { "hash": "c4aba21d546f519469e8a65101e9cd44b25dae028b48a223b8cb6c19f83b60d4" } }, { "id": "FileDrop", "title": "FileDrop", "type": "snippet", "attributes": { "fileName": "FileDrop.md", "text": "Renders a file drag and drop component for a single file.\n\n- Create a ref called `dropRef` for this component.\n- Use the `React.useState()` hook to create the `drag` and `filename` variables, initialized to `false` and `''` respectively.\n The variables `dragCounter` and `drag` are used to determine if a file is being dragged, while `filename` is used to store the dropped file's name.\n- Create the `handleDrag`, `handleDragIn`, `handleDragOut` and `handleDrop` methods to handle drag and drop functionality, bind them to the component's context.\n- Each of the methods will handle a specific event, the listeners for which are created and removed in the `React.useEffect()` hook and its attached `cleanup()` method.\n- `handleDrag` prevents the browser from opening the dragged file, `handleDragIn` and `handleDragOut` handle the dragged file entering and exiting the component, while `handleDrop` handles the file being dropped and passes it to `props.handleDrop`.\n- Return an appropriately styled `
        ` and use `drag` and `filename` to determine its contents and style.\n- Finally, bind the `ref` of the created `
        ` to `dropRef`.\n\n", "codeBlocks": { "style": ".filedrop {\r\n min-height: 120px;\r\n border: 3px solid #d3d3d3;\r\n text-align: center;\r\n font-size: 24px;\r\n padding: 32px;\r\n border-radius: 4px;\r\n}\r\n\r\n.filedrop.drag {\r\n border: 3px dashed #1e90ff;\r\n}\r\n\r\n.filedrop.ready {\r\n border: 3px solid #32cd32;\r\n}", "code": "function FileDrop(props) {\r\n const [drag, setDrag] = React.useState(false);\r\n const [filename, setFilename] = React.useState('');\r\n let dropRef = React.createRef();\r\n let dragCounter = 0;\r\n\r\n const handleDrag = e => {\r\n e.preventDefault();\r\n e.stopPropagation();\r\n };\r\n\r\n const handleDragIn = e => {\r\n e.preventDefault();\r\n e.stopPropagation();\r\n dragCounter++;\r\n if (e.dataTransfer.items && e.dataTransfer.items.length > 0) setDrag(true);\r\n };\r\n\r\n const handleDragOut = e => {\r\n e.preventDefault();\r\n e.stopPropagation();\r\n dragCounter--;\r\n if (dragCounter === 0) setDrag(false);\r\n };\r\n\r\n const handleDrop = e => {\r\n e.preventDefault();\r\n e.stopPropagation();\r\n setDrag(false);\r\n if (e.dataTransfer.files && e.dataTransfer.files.length > 0) {\r\n props.handleDrop(e.dataTransfer.files[0]);\r\n setFilename(e.dataTransfer.files[0].name);\r\n e.dataTransfer.clearData();\r\n dragCounter = 0;\r\n }\r\n };\r\n\r\n React.useEffect(() => {\r\n let div = dropRef.current;\r\n div.addEventListener('dragenter', handleDragIn);\r\n div.addEventListener('dragleave', handleDragOut);\r\n div.addEventListener('dragover', handleDrag);\r\n div.addEventListener('drop', handleDrop);\r\n return function cleanup() {\r\n div.removeEventListener('dragenter', handleDragIn);\r\n div.removeEventListener('dragleave', handleDragOut);\r\n div.removeEventListener('dragover', handleDrag);\r\n div.removeEventListener('drop', handleDrop);\r\n };\r\n });\r\n\r\n return (\r\n \r\n {filename && !drag ?
        {filename}
        :
        Drop files here!
        }\r\n
        \r\n );\r\n}", "example": "ReactDOM.render(, document.getElementById('root'));" }, "tags": [ "visual", "input", "state", "effect", "event", "intermediate" ] }, "meta": { "hash": "2e35dd3fa6b4808f03aff6b542b293f8be0fd9aa1cbb7bd85a2729f808cf8888" } }, { "id": "LimitedTextarea", "title": "LimitedTextarea", "type": "snippet", "attributes": { "fileName": "LimitedTextarea.md", "text": "Renders a textarea component with a character limit.\n\n- Use the `React.useState()` hook to create the `content` state variable and set its value to `value`.\n Create a method `setFormattedContent`, which trims the content of the input if it's longer than `limit`.\n- Use the `React.useEffect()` hook to call the `setFormattedContent` method on the value of the `content` state variable.\n- Use a`
        ` to wrap both the`