Carregador de vários estágios do player de música
Conclua um carregador em várias etapas para o cenário de player de música: inclui conteúdo real, controles acionáveis, feedback de estado claro e layout responsivo a diferentes tamanhos.
É possível editar, executar e salvar este exemplo após ativar JavaScript. O código-fonte fixo é o seguinte:
<!doctype html>
<html lang="pt-BR" dir="ltr">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Carregador de vários estágios do player de música</title>
<style>
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</style>
</head>
<body data-aesthetic="monochrome" data-composition="studio">
<main class="page">
<header class="mast"><div><span class="eyebrow">monochrome / carregador em várias etapas / INTERMEDIATE</span><h1>Carregador de vários estágios do player de música</h1><p class="intro">Conclua um carregador em várias etapas para o cenário de player de música: inclui conteúdo real, controles acionáveis, feedback de estado claro e layout responsivo a diferentes tamanhos.</p></div><span class="scenario">Reprodutor de música</span></header>
<div class="composition-studio"><div class="studio-ruler" aria-hidden="true"></div><section class="demo" aria-label="Área de interação do carregador em várias etapas do tocador de música"><div class="workflow-compare"><form id="workflowCompareControls" class="compare-controls"><fieldset><legend>Canal de comparação</legend><label><input type="radio" name="workflowChannel" value="A" checked>A · versão original</label><label><input type="radio" name="workflowChannel" value="B">B · versão ao vivo</label></fieldset><label>Peso do progresso da reprodução<input id="workflowCompareWeight" type="range" min="10" max="90" value="50"><output id="workflowCompareWeightValue">50 %</output></label><label><input id="workflowCompareFreeze" type="checkbox">Congelar a versão atual</label><button id="workflowCompareCapture" class="action primary" type="button">Amostragem e salvamento da reprodução</button><ol id="workflowCompareShelf" aria-label="Versão de amostra de registro"></ol></form><section class="compare-stage"><header><span class="eyebrow">Player de música COMPARE</span><h2>Comparação entre duas versões da reprodução</h2><output id="workflowCompareLive">Versão A aguardando amostragem</output></header><section id="workflowCore" class="workflow-core compare-core" data-compare-channel="A" style="--compare-split:50%"><!-- 11DZ_CORE_START:animation-microinteractions-css-loader --><div class="stage-loader panel"><header><span class="eyebrow">MULTI-STAGE LOADER</span><h2>Fila de processamento do tocador de música</h2></header><div id="loaderTrack" class="loader-track" role="progressbar" aria-label="Progresso de carregamento em três etapas" aria-valuemin="0" aria-valuemax="3" aria-valuenow="0"><i></i><i></i><i></i><span></span></div><ol id="loaderSteps"><li>Preparar recursos</li><li>Processando conteúdo</li><li>Validação concluída</li></ol><button id="startLoader" class="action primary" type="button" data-core-bridge="animation-microinteractions-css-loader">Iniciar carregamento</button></div><!-- 11DZ_CORE_END --></section></section></div><p id="status" class="status" role="status" aria-live="polite"></p></section></div>
</main>
<script>
'use strict';
const statusOutput = document.querySelector('#status');
const announce = message => { statusOutput.textContent = message; };
/* 11DZ_CORE_SCRIPT_START:animation-microinteractions-css-loader */
const loaderTrack=document.querySelector('#loaderTrack');const loaderDots=[...loaderTrack.querySelectorAll('i')];const loaderLabels=[...document.querySelectorAll('#loaderSteps li')];let loaderTimers=[];let loaderRun=0;document.querySelector('#startLoader').addEventListener('click',event=>{loaderTimers.forEach(clearTimeout);loaderTimers=[];loaderRun+=1;loaderTrack.dataset.run=String(loaderRun);loaderTrack.classList.add('is-running');loaderDots.forEach(dot=>dot.classList.remove('is-done'));loaderLabels.forEach(label=>label.classList.remove('is-active'));loaderTrack.setAttribute('aria-valuenow','0');event.currentTarget.textContent=loaderRun===1?'Reiniciar carregamento':'Recomeçar · Nº '+loaderRun+' Próximo';announce('Iniciado número '+loaderRun+' Próxima carga local');loaderDots.forEach((dot,index)=>loaderTimers.push(setTimeout(()=>{dot.classList.add('is-done');loaderLabels[index].classList.add('is-active');loaderTrack.setAttribute('aria-valuenow',String(index+1));announce('Etapa concluída '+(index+1)+'：'+loaderLabels[index].textContent);if(index===loaderDots.length-1){loaderTrack.classList.remove('is-running');event.currentTarget.textContent='Recarregar';}},(index+1)*450)));});
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workflowBridgeReset();
</script>
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