{"$schema":"https://ui.shadcn.com/schema/registry-item.json","name":"chart-builder","type":"registry:component","title":"Chart Builder","description":"Turn manually entered categories and numbers into a simple bar chart.","author":"Notion Arena","categories":["dashboards"],"tags":["widget","free","chart","bar chart","data visualization","manual data","offline"],"meta":{"kind":"widget","tier":"free","version":"1.0.0","updatedAt":"2026-10-11","notionPlan":"Free","emoji":"📊","delivery":["embed","html-block","download"],"capabilities":{"interactive":true,"offlineSafe":true,"persistsLocally":true,"writesToNotion":false,"needsNetwork":false},"embedUrl":"https://notionarena.vercel.app/embed/chart-builder","fileUrl":"https://notionarena.vercel.app/widgets/chart-builder.html","downloadUrl":"https://notionarena.vercel.app/api/widget/chart-builder","height":330,"minHeight":250,"maxHeight":500,"params":[{"key":"label","label":"Widget title","type":"text","default":"Chart 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Builder</title>\n<style>\n:root{--bg:#fff;--fg:#37352f;--muted:#6b6a68;--surface:#f7f7f5;--border:#e9e9e7;--accent:#2383e2;--accent-ink:#fff;--accent-text:var(--accent);--danger:#c24136}\nhtml[data-theme=\"dark\"]{--bg:#191919;--fg:#e6e6e4;--muted:#9b9a97;--surface:#252525;--border:#343434;--danger:#ff7369}\n@media(prefers-color-scheme:dark){html[data-theme=\"auto\"]{--bg:#191919;--fg:#e6e6e4;--muted:#9b9a97;--surface:#252525;--border:#343434;--danger:#ff7369}}\n*{box-sizing:border-box}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}html,body{margin:0;height:100%}body{background:var(--bg);color:var(--fg);font-family:ui-sans-serif,-apple-system,BlinkMacSystemFont,\"Segoe 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var(--border);border-radius:6px;background:var(--surface);color:var(--muted);cursor:pointer}.remove:hover{border-color:var(--danger);color:var(--danger)}.empty{text-align:center;padding:12px;color:var(--muted);font-size:10px}.foot{display:flex;align-items:center;justify-content:space-between;gap:8px}.status,.note{font-size:9px;color:var(--muted);line-height:1.35}.clear{min-height:26px;border:1px solid var(--border);border-radius:7px;background:var(--surface);color:var(--fg);font:inherit;font-size:9px;padding:4px 7px;cursor:pointer}@media(max-width:340px){.wrap{padding:10px}.form{grid-template-columns:minmax(0,1fr) 88px auto}.bar-row{grid-template-columns:minmax(42px,74px) minmax(35px,1fr) auto 21px;gap:4px}.value{min-width:32px;font-size:8px}}@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important;scroll-behavior:auto!important}}\n</style>\n</head>\n<body><main class=\"wrap\">\n  <header class=\"head\"><div><div class=\"kicker\">Chart from your values</div><div class=\"title\" id=\"title\">Chart builder</div></div><div class=\"count\"><b id=\"count\">0</b>values</div></header>\n  <form class=\"form\" id=\"form\"><label class=\"sr-only\" for=\"label\">Category label</label><input id=\"label\" maxlength=\"32\" placeholder=\"Category\" required /><label class=\"sr-only\" for=\"value\">Numeric value</label><input id=\"value\" type=\"number\" min=\"0\" max=\"1000000000000\" step=\"any\" placeholder=\"Value\" required /><button type=\"submit\">Add</button></form>\n  <section class=\"chart\" id=\"chart\" role=\"list\" aria-label=\"Horizontal bar chart\"></section>\n  <footer class=\"foot\"><span class=\"status\" id=\"status\" aria-live=\"polite\">Bars scale to your largest value. Data stays local.</span><button class=\"clear\" id=\"clear\" type=\"button\">Clear chart</button></footer>\n  <div class=\"note\">Uses only values you enter; no live data, external requests, or automatic analysis.</div>\n</main>\n<script>\n(function(){\n  var cfgEl=document.getElementById('bk-config'),base={};try{base=cfgEl?JSON.parse(cfgEl.textContent||'{}'):{};}catch(e){}var q=new URLSearchParams(location.search),c={};for(var k in base)c[k]=base[k];q.forEach(function(v,k){c[k]=v;});\n  function safeColor(v,d){return /^#[0-9a-f]{6}$/i.test(String(v||''))?String(v):d;}function rgb(h){var s=String(h).slice(1);return[0,2,4].map(function(i){return parseInt(s.slice(i,i+2),16);});}function lum(a){return a.map(function(v){v/=255;return v<=.04045?v/12.92:Math.pow((v+.055)/1.055,2.4);}).reduce(function(s,v,i){return s+v*[.2126,.7152,.0722][i];},0);}function ratio(a,b){var x=lum(a),y=lum(b);return(Math.max(x,y)+.05)/(Math.min(x,y)+.05);}function ink(h){var a=rgb(h);return ratio(a,[255,255,255])>=ratio(a,[0,0,0])?'#fff':'#000';}function textColor(h){var dark=theme==='dark'||(theme==='auto'&&window.matchMedia&&window.matchMedia('(prefers-color-scheme: dark)').matches),bg=rgb(dark?'#252525':'#f7f7f5'),a=rgb(h),to=dark?[255,255,255]:[0,0,0];if(ratio(a,bg)>=4.5)return h;for(var t=.02;t<=1;t+=.02){var m=a.map(function(v,i){return Math.round(v+(to[i]-v)*t);});if(ratio(m,bg)>=4.5)return'#'+m.map(function(v){return v.toString(16).padStart(2,'0');}).join('');}return dark?'#fff':'#191919';}function setText(){document.documentElement.style.setProperty('--accent-text',textColor(ACCENT));}\n  var theme=['auto','light','dark'].indexOf(String(c.theme||'auto'))>=0?String(c.theme||'auto'):'auto',ACCENT=safeColor(c.accent,'#2383e2'),LABEL=String(c.label||'Chart builder').slice(0,48),KEY='notion-arena.chart-builder.v1',items=[];\n  document.documentElement.setAttribute('data-theme',theme);document.documentElement.style.setProperty('--accent',ACCENT);document.documentElement.style.setProperty('--accent-ink',ink(ACCENT));setText();if(theme==='auto'&&window.matchMedia){var mq=window.matchMedia('(prefers-color-scheme: dark)');if(mq.addEventListener)mq.addEventListener('change',setText);else if(mq.addListener)mq.addListener(setText);}document.getElementById('title').textContent=LABEL;document.title=LABEL;\n  try{var a=JSON.parse(localStorage.getItem(KEY)||'[]');if(Array.isArray(a))items=a.filter(function(x){return x&&typeof x.label==='string'&&isFinite(Number(x.value))&&Number(x.value)>=0;}).slice(0,40);}catch(e){}var chart=document.getElementById('chart'),status=document.getElementById('status');function save(msg){try{localStorage.setItem(KEY,JSON.stringify(items));status.textContent=msg||'Bars scale to your largest value. Data stays local.';}catch(e){status.textContent='Storage is unavailable in this browser session.';}}function format(v){return new Intl.NumberFormat(undefined,{maximumFractionDigits:3}).format(v);}\n  function render(){chart.textContent='';document.getElementById('count').textContent=String(items.length);if(!items.length){var empty=document.createElement('div');empty.className='empty';empty.textContent='Add categories and values to build a small bar chart.';chart.appendChild(empty);return;}var max=items.reduce(function(m,x){return Math.max(m,Number(x.value)||0);},0);items.forEach(function(item,index){var row=document.createElement('div');row.className='bar-row';row.setAttribute('role','listitem');var label=document.createElement('span');label.className='label';label.textContent=item.label;var track=document.createElement('div');track.className='track';track.setAttribute('aria-hidden','true');var bar=document.createElement('div');bar.className='bar';bar.style.width=(max>0?Number(item.value)/max*100:0)+'%';track.appendChild(bar);var value=document.createElement('span');value.className='value';value.textContent=format(Number(item.value));var remove=document.createElement('button');remove.className='remove';remove.type='button';remove.textContent='×';remove.setAttribute('aria-label','Remove '+item.label);remove.addEventListener('click',function(){items.splice(index,1);save();render();});row.setAttribute('aria-label',item.label+', '+format(Number(item.value)));row.append(label,track,value,remove);chart.appendChild(row);});}\n  document.getElementById('form').addEventListener('submit',function(e){e.preventDefault();var label=document.getElementById('label').value.trim().slice(0,32),value=Number(document.getElementById('value').value);if(!label||!isFinite(value)||value<0||value>1000000000000){status.textContent='Enter a category and a non-negative value up to one trillion.';return;}if(items.length>=40){status.textContent='Chart limit reached.';return;}items.push({label:label,value:value});document.getElementById('label').value='';document.getElementById('value').value='';save();render();document.getElementById('label').focus();});document.getElementById('clear').addEventListener('click',function(){items=[];save('Chart cleared.');render();});render();\n})();\n</script>\n</body>\n</html>\n"}]}