Home >Web Front-end >CSS Tutorial >Custom Elements Unleashed: Dominando customElements.define() e .get() como um Jedi do Front-end!
Hey, dev guys! Ready to unlock the secrets of the Custom Elements universe? Today we're going to dive deep into the powers of customElements.define() and customElements.get() - the secret weapons every front-end Jedi needs to master!
Imagine you are a mad front-end scientist and want to create your own HTML creature. That's where customElements.define() comes in. It's like that Mewtwo cloning machine, but for web elements!
class ElementoTopzera extends HTMLElement { constructor() { super(); this.innerHTML = `<p>Eu sou incrível e customizado!</p>`; } } customElements.define('elemento-topzera', ElementoTopzera);
Now you can use your element as if it were native to HTML:
<elemento-topzera></elemento-topzera>
BOOM! ? You just created life... in the DOM!
class BotaoContador extends HTMLElement { constructor() { super(); this.count = 0; this.innerHTML = ` <button>Cliques: <span>0</span></button> `; this.addEventListener('click', () => { this.count++; this.querySelector('span').textContent = this.count; }); } } customElements.define('botao-contador', BotaoContador);
class CardPerfil extends HTMLElement { constructor() { super(); const nome = this.getAttribute('nome') || 'Dev Anônimo'; const skill = this.getAttribute('skill') || 'Café++'; this.innerHTML = ` <div style="border: 2px solid #333; padding: 10px; margin: 10px;"> <h2>${nome}</h2> <p>Skill Suprema: ${skill}</p> </div> `; } } customElements.define('card-perfil', CardPerfil);
Use it like this, look:
<card-perfil nome="ZézimDev" skill="Bug Hunter"></card-perfil>
Now, what if you wanted to investigate whether a custom element already exists? That's where customElements.get() comes in - the private detective of the Web Components world!
const ElementoTopzera = customElements.get('elemento-topzera'); if (ElementoTopzera) { console.log('Elemento encontrado! Hora do show!'); // Faz alguma mágica aqui } else { console.log('404 Elemento Not Found'); }
function carregaComponenteSeNecessario(nomeElemento) { if (!customElements.get(nomeElemento)) { import(`./components/${nomeElemento}.js`) .then(() => console.log(`${nomeElemento} carregado e pronto pra ação!`)) .catch(err => console.error(`Oops, deu ruim ao carregar ${nomeElemento}`, err)); } } carregaComponenteSeNecessario('super-tabela');
function elementoSeguro(nomeElemento) { const elemento = customElements.get(nomeElemento); if (elemento && elemento.prototype instanceof HTMLElement) { console.log('Elemento verificado e aprovado! ?'); return true; } console.warn('Elemento suspeito detectado! ?'); return false; } elementoSeguro('botao-contador'); // true, se definido anteriormente elementoSeguro('virus-malicioso'); // false, espero eu! ?
class SuperButton extends HTMLButtonElement { // Código supimpa aqui } customElements.define('super-button', SuperButton, { extends: 'button' });
With customElements.define() and customElements.get(), you're ready to create a more customized web than a streamer setup! Remember: with great powers come great opportunities to create incredible components!
Now it's up to you! Go create your elements and revolutionize the web! And if you get caught in a bug, take a deep breath and think: "What would Linus Torvalds do?" ??
Do you want to delve deeper into this multiverse of possibilities? Take a look at the official Custom Elements documentation on MDN. It's like the grimoire of front-end wizards! ?✨
What's up, dev? Are you excited to create your own elements? Share in the comments what crazy element you will create! Maybe next time we'll do a
May the code be with you, always! ???
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