mirror of
https://github.com/LukeHagar/unicorn-utterances.git
synced 2025-12-06 04:21:55 +00:00
docs: add basic element references
This commit is contained in:
Corbin Crutchley
@@ -0,0 +1,24 @@
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# Logs
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logs
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*.log
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npm-debug.log*
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yarn-debug.log*
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yarn-error.log*
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pnpm-debug.log*
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lerna-debug.log*
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node_modules
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dist
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dist-ssr
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*.local
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# Editor directories and files
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.vscode/*
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!.vscode/extensions.json
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.idea
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.DS_Store
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*.suo
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*.ntvs*
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*.njsproj
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*.sln
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*.sw?
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<html>
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<head>
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<title>React addEventListener - Example #62b - FFG Fundamentals</title>
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</head>
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<body>
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<div id="root"></div>
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<script type="module" src="/src/main.jsx"></script>
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</body>
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</html>
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{
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"name": "@ffg-fundamentals/react-add-event-listener-62",
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"private": true,
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"version": "0.0.0",
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"type": "module",
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"scripts": {
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"dev": "vite",
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"build": "vite build",
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"preview": "vite preview"
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},
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"dependencies": {
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"react": "^18.2.0",
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"react-dom": "^18.2.0"
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},
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"devDependencies": {
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"@vitejs/plugin-react": "^4.0.4",
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"vite": "^4.4.9"
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}
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}
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@@ -0,0 +1,14 @@
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import { createRoot } from "react-dom/client";
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const RenderButton = () => {
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// el is HTMLElement
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const addClickListener = (el) => {
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el.addEventListener("click", () => {
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alert("User has clicked!");
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});
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};
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return <button ref={addClickListener}>Click me!</button>;
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};
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createRoot(document.getElementById("root")).render(<RenderButton />);
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@@ -0,0 +1,6 @@
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import { defineConfig } from "vite";
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import react from "@vitejs/plugin-react";
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export default defineConfig({
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plugins: [react()],
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});
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@@ -0,0 +1,24 @@
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# Logs
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logs
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*.log
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npm-debug.log*
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yarn-debug.log*
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yarn-error.log*
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pnpm-debug.log*
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lerna-debug.log*
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node_modules
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dist
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dist-ssr
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*.local
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# Editor directories and files
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.vscode/*
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!.vscode/extensions.json
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.idea
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.DS_Store
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*.suo
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*.ntvs*
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*.njsproj
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*.sln
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*.sw?
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@@ -0,0 +1,9 @@
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<html>
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<head>
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<title>React Ref Property - Example #62a - FFG Fundamentals</title>
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</head>
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<body>
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<div id="root"></div>
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<script type="module" src="/src/main.jsx"></script>
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</body>
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</html>
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2056
content/blog/ffg-fundamentals-element-reference/ffg-fundamentals-react-ref-property-62/package-lock.json
generated
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2056
content/blog/ffg-fundamentals-element-reference/ffg-fundamentals-react-ref-property-62/package-lock.json
generated
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File diff suppressed because it is too large
Load Diff
@@ -0,0 +1,19 @@
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{
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"name": "@ffg-fundamentals/react-ref-property-62",
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"private": true,
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"version": "0.0.0",
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"type": "module",
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"scripts": {
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"dev": "vite",
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"build": "vite build",
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"preview": "vite preview"
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},
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"dependencies": {
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"react": "^18.2.0",
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"react-dom": "^18.2.0"
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},
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"devDependencies": {
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"@vitejs/plugin-react": "^4.0.4",
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"vite": "^4.4.9"
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}
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}
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@@ -0,0 +1,8 @@
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import { createRoot } from "react-dom/client";
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const RenderParagraph = () => {
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// el is HTMLElement
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return <p ref={(el) => console.log({ el: el })}>Check your console</p>;
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};
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createRoot(document.getElementById("root")).render(<RenderParagraph />);
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@@ -0,0 +1,6 @@
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import { defineConfig } from "vite";
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import react from "@vitejs/plugin-react";
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export default defineConfig({
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plugins: [react()],
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});
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@@ -0,0 +1,24 @@
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# Logs
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logs
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*.log
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||||
npm-debug.log*
|
||||
yarn-debug.log*
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||||
yarn-error.log*
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||||
pnpm-debug.log*
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||||
lerna-debug.log*
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||||
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node_modules
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||||
dist
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dist-ssr
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||||
*.local
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||||
|
||||
# Editor directories and files
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.vscode/*
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||||
!.vscode/extensions.json
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||||
.idea
|
||||
.DS_Store
|
||||
*.suo
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||||
*.ntvs*
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||||
*.njsproj
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||||
*.sln
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*.sw?
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@@ -0,0 +1,9 @@
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<html>
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<head>
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<title>React useState Ref Broken - Example #62e - FFG Fundamentals</title>
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</head>
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<body>
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<div id="root"></div>
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<script type="module" src="/src/main.jsx"></script>
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</body>
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</html>
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2056
content/blog/ffg-fundamentals-element-reference/ffg-fundamentals-react-use-ref-broken-62/package-lock.json
generated
Normal file
2056
content/blog/ffg-fundamentals-element-reference/ffg-fundamentals-react-use-ref-broken-62/package-lock.json
generated
Normal file
File diff suppressed because it is too large
Load Diff
@@ -0,0 +1,19 @@
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{
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"name": "@ffg-fundamentals/react-use-ref-broken-62",
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"private": true,
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"version": "0.0.0",
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"type": "module",
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"scripts": {
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"dev": "vite",
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"build": "vite build",
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"preview": "vite preview"
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},
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"dependencies": {
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"react": "^18.2.0",
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"react-dom": "^18.2.0"
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},
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"devDependencies": {
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"@vitejs/plugin-react": "^4.0.4",
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"vite": "^4.4.9"
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}
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}
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@@ -0,0 +1,41 @@
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import { createRoot } from "react-dom/client";
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import { useState, useRef, useEffect } from "react";
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// This code intentionally doesn't work to demonstrate how `useRef`
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// might not work with `useEffect` as you might think
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const CountButton = () => {
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const [count, setCount] = useState(0);
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const buttonRef = useRef();
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const [showButton, setShowButton] = useState(false);
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useEffect(() => {
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const interval = setInterval(() => {
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setShowButton(true);
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}, 1000);
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return () => clearInterval(interval);
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}, []);
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useEffect(() => {
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const clickFn = () => {
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setCount((v) => v + 1);
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};
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if (!buttonRef.current) return;
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buttonRef.current.addEventListener("click", clickFn);
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return () => {
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buttonRef.current.removeEventListener("click", clickFn);
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};
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}, [buttonRef.current]);
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return (
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<>
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{showButton && <button ref={buttonRef}>Add one</button>}
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<p>Count is {count}</p>
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</>
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);
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};
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createRoot(document.getElementById("root")).render(<CountButton />);
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@@ -0,0 +1,6 @@
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import { defineConfig } from "vite";
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import react from "@vitejs/plugin-react";
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export default defineConfig({
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plugins: [react()],
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});
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@@ -0,0 +1,24 @@
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# Logs
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||||
logs
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||||
*.log
|
||||
npm-debug.log*
|
||||
yarn-debug.log*
|
||||
yarn-error.log*
|
||||
pnpm-debug.log*
|
||||
lerna-debug.log*
|
||||
|
||||
node_modules
|
||||
dist
|
||||
dist-ssr
|
||||
*.local
|
||||
|
||||
# Editor directories and files
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||||
.vscode/*
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||||
!.vscode/extensions.json
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||||
.idea
|
||||
.DS_Store
|
||||
*.suo
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||||
*.ntvs*
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||||
*.njsproj
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||||
*.sln
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||||
*.sw?
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@@ -0,0 +1,9 @@
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<html>
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<head>
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<title>React useState Ref Fragile - Example #62d - FFG Fundamentals</title>
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</head>
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<body>
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<div id="root"></div>
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<script type="module" src="/src/main.jsx"></script>
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</body>
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</html>
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2056
content/blog/ffg-fundamentals-element-reference/ffg-fundamentals-react-use-ref-fragile-62/package-lock.json
generated
Normal file
2056
content/blog/ffg-fundamentals-element-reference/ffg-fundamentals-react-use-ref-fragile-62/package-lock.json
generated
Normal file
File diff suppressed because it is too large
Load Diff
@@ -0,0 +1,19 @@
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{
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"name": "@ffg-fundamentals/react-use-state-ref-fragile-62",
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"private": true,
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"version": "0.0.0",
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"type": "module",
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"scripts": {
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"dev": "vite",
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"build": "vite build",
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"preview": "vite preview"
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},
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"dependencies": {
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"react": "^18.2.0",
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"react-dom": "^18.2.0"
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},
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"devDependencies": {
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"@vitejs/plugin-react": "^4.0.4",
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"vite": "^4.4.9"
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}
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}
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@@ -0,0 +1,29 @@
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import { createRoot } from "react-dom/client";
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import { useState, useRef, useEffect } from "react";
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const CountButton = () => {
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const [count, setCount] = useState(0);
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const buttonRef = useRef();
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useEffect(() => {
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const clickFn = () => {
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setCount((v) => v + 1);
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};
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buttonRef.current.addEventListener("click", clickFn);
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return () => {
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buttonRef.current.removeEventListener("click", clickFn);
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};
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// Do not use a useRef inside of a useEffect like this, it will likely cause bugs
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}, [buttonRef.current]);
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return (
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<>
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<button ref={buttonRef}>Add one</button>
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<p>Count is {count}</p>
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</>
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);
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};
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createRoot(document.getElementById("root")).render(<CountButton />);
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@@ -0,0 +1,6 @@
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import { defineConfig } from "vite";
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import react from "@vitejs/plugin-react";
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export default defineConfig({
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plugins: [react()],
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});
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@@ -0,0 +1,24 @@
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# Logs
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||||
logs
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||||
*.log
|
||||
npm-debug.log*
|
||||
yarn-debug.log*
|
||||
yarn-error.log*
|
||||
pnpm-debug.log*
|
||||
lerna-debug.log*
|
||||
|
||||
node_modules
|
||||
dist
|
||||
dist-ssr
|
||||
*.local
|
||||
|
||||
# Editor directories and files
|
||||
.vscode/*
|
||||
!.vscode/extensions.json
|
||||
.idea
|
||||
.DS_Store
|
||||
*.suo
|
||||
*.ntvs*
|
||||
*.njsproj
|
||||
*.sln
|
||||
*.sw?
|
||||
@@ -0,0 +1,9 @@
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<html>
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<head>
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<title>React useState Ref - Example #62c - FFG Fundamentals</title>
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</head>
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<body>
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<div id="root"></div>
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<script type="module" src="/src/main.jsx"></script>
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</body>
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</html>
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||||
2056
content/blog/ffg-fundamentals-element-reference/ffg-fundamentals-react-use-state-ref-62/package-lock.json
generated
Normal file
2056
content/blog/ffg-fundamentals-element-reference/ffg-fundamentals-react-use-state-ref-62/package-lock.json
generated
Normal file
File diff suppressed because it is too large
Load Diff
@@ -0,0 +1,19 @@
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{
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"name": "@ffg-fundamentals/react-use-state-ref-62",
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"private": true,
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"version": "0.0.0",
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"type": "module",
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"scripts": {
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"dev": "vite",
|
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"build": "vite build",
|
||||
"preview": "vite preview"
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},
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"dependencies": {
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"react": "^18.2.0",
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"react-dom": "^18.2.0"
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},
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"devDependencies": {
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"@vitejs/plugin-react": "^4.0.4",
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"vite": "^4.4.9"
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||||
}
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||||
}
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@@ -0,0 +1,38 @@
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import { createRoot } from "react-dom/client";
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import { useState, useEffect } from "react";
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const CountButton = () => {
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const [count, setCount] = useState(0);
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const [buttonEl, setButtonEl] = useState();
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const storeButton = (el) => {
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setButtonEl(el);
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};
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useEffect(() => {
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// Initial render will not have `buttonEl` defined, subsequent renders will
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if (!buttonEl) return;
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const clickFn = () => {
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/**
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* We need to use `v => v + 1` instead of `count + 1`, otherwise `count` will
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* be stale and not update further than `1`. More details in the next paragraph.
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*/
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setCount((v) => v + 1);
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};
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buttonEl.addEventListener("click", clickFn);
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return () => {
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buttonEl.removeEventListener("click", clickFn);
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};
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}, [buttonEl]);
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|
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return (
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<>
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<button ref={storeButton}>Add one</button>
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<p>Count is {count}</p>
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</>
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||||
);
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};
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|
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createRoot(document.getElementById("root")).render(<CountButton />);
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||||
@@ -0,0 +1,6 @@
|
||||
import { defineConfig } from "vite";
|
||||
import react from "@vitejs/plugin-react";
|
||||
|
||||
export default defineConfig({
|
||||
plugins: [react()],
|
||||
});
|
||||
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