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React: Difference between revisions
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== Babel == | == Babel == | ||
template file to use | |||
<source lang="html"> | |||
<!DOCTYPE html> | |||
<html> | |||
<head> | |||
<meta charset="utf-8" /> | |||
<title>React Examples</title> | |||
</head> | |||
<body> | |||
<div id="root"></div> | |||
<!-- React Library & React DOM --> | |||
<script src="https://unpkg.com/react@16.8.6/umd/react.development.js"></script> | |||
<script src="https://unpkg.com/react-dom@16.8.6/umd/react-dom.development.js"></script> | |||
<script src="https://unpkg.com/@babel/standalone/babel.min.js"></script> | |||
<script type="text/babel"> | |||
// JSX code here. Or link to separate JavaScript file that contains JSX. | |||
</script> | |||
</body> | |||
</html> | |||
</source> | |||
== Recipes as JSX == | |||
<source lang="js"> | |||
const data = [ | |||
{ | |||
name: "Baked Salmon", | |||
ingredients: [ | |||
{ name: "Salmon", amount: 1, measurement: "l lb" }, | |||
{ name: "Pine Nuts", amount: 1, measurement: "cup" }, | |||
{ name: "Butter Lettuce", amount: 2, measurement: "cups" }, | |||
{ name: "Yellow Squash", amount: 1, measurement: "med" }, | |||
{ name: "Olive Oil", amount: 0.5, measurement: "cup" }, | |||
{ name: "Garlic", amount: 3, measurement: "cloves" } | |||
], | |||
steps: [ | |||
"Preheat the oven to 350 degrees.", | |||
"Spread the olive oil around a glass baking dish.", | |||
"Add the yellow squash and place in the oven for 30 mins.", | |||
"Add the salmon, garlic, and pine nuts to the dish.", | |||
"Bake for 15 minutes.", | |||
"Remove from oven. Add the lettuce and serve." | |||
] | |||
}, | |||
{ | |||
name: "Fish Tacos", | |||
ingredients: [ | |||
{ name: "Whitefish", amount: 1, measurement: "l lb" }, | |||
{ name: "Cheese", amount: 1, measurement: "cup" }, | |||
{ name: "Iceberg Lettuce", amount: 2, measurement: "cups" }, | |||
{ name: "Tomatoes", amount: 2, measurement: "large" }, | |||
{ name: "Tortillas", amount: 3, measurement: "med" } | |||
], | |||
steps: [ | |||
"Cook the fish on the grill until cooked through.", | |||
"Place the fish on the 3 tortillas.", | |||
"Top them with lettuce, tomatoes, and cheese." | |||
] | |||
} | |||
]; | |||
// A function component for an individual Recipe | |||
function Recipe (props) { | |||
... | |||
} | |||
// A function component for the Menu of Recipes | |||
function Menu (props) { | |||
return ( | |||
<article> | |||
<header> | |||
<h1>{props.title}</h1> | |||
</header> | |||
<div className="recipes"> | |||
{props.recipes.map((recipe, i) => ( | |||
<Recipe | |||
key={i} | |||
name={recipe.name} | |||
ingredients={recipe.ingredients} | |||
steps={recipe.steps} | |||
/> | |||
))} | |||
// equivalent to | |||
{ | |||
props.recipes.map((recipe, i) => <Recipe key={i} {...recipe} />); | |||
} | |||
</div> | |||
</article> | |||
); | |||
} | |||
// A call to ReactDOM.render to render our Menu into the current DOM | |||
ReactDOM.render( | |||
<Menu recipes={data} title="Delicious Recipes" />, | |||
document.getElementById("root") | |||
); | |||
</source> | |||
we can access title & recipes vars directly, so vars don't have to be prefixed with props: | |||
<source lang="js"> | |||
function Menu({ title, recipes }) { | |||
return ( | |||
<article> | |||
<header> | |||
<h1>{title}</h1> | |||
</header> | |||
<div className="recipes"> | |||
{recipes.map((recipe, i) => ( | |||
<Recipe key={i} {...recipe} /> | |||
))} | |||
</div> | |||
</article> | |||
); | |||
} | |||
</source> | |||
code for the component for each individual recipe: | |||
<source lang="js"> | |||
function Recipe({ name, ingredients, steps }) { | |||
return ( | |||
<section id={name.toLowerCase().replace(/ /g, "-")}> | |||
<h1>{name}</h1> | |||
<ul className="ingredients"> | |||
{ingredients.map((ingredient, i) => ( | |||
<li key={i}>{ingredient.name}</li> | |||
))} | |||
</ul> | |||
<section className="instructions"> | |||
<h2>Cooking Instructions</h2> | |||
{steps.map((step, i) => ( | |||
<p key={i}>{step}</p> | |||
))} | |||
</section> | |||
</section> | |||
); | |||
} | |||
</source> | |||
= React State Management = | = React State Management = | ||