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<title>Context Data - Nullstack</title>

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<div id="application"><main class="light bgm1 cm3"><header class="x12 pftl bgm1 bs2"><div class="x xsb yy p5y"><div class="sm-x12 sm-xsb sm-p4x yy"><a title="Nullstack" href="/"><svg xmlns="http://www.w3.org/2000/svg" height="30" viewBox="0 0 511.5039 113.7368"><title> Nullstack </title><path d="M13.2736,39.964H28.7009v9.8922a20.3919,20.3919,0,0,1,7.743-8.479,21.2792,21.2792,0,0,1,11.2172-3.0031q7.36,0,11.3349,4.1218t3.9745,11.6588a48.9655,48.9655,0,0,1-1.06,8.8913l-8.3025,42.8665H36.3556L44.187,65.7546a31.2306,31.2306,0,0,0,.5888-5.5939q0-7.6542-6.3593-7.6547a10.7348,10.7348,0,0,0-8.4791,4.3278q-3.5922,4.328-5.0639,12.0415l-7.1248,37.0372H.4961Z" transform="translate(-0.4961)" fill="#2d3748"></path><path 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d="M415.1828,107.62q-13.72,0-21.1683-7.4192t-7.4486-21.4333a42.63,42.63,0,0,1,5.005-20.8444,36.7663,36.7663,0,0,1,13.9257-14.338,40.3978,40.3978,0,0,1,20.7562-5.2111A39.0215,39.0215,0,0,1,445.8607,43.32l-3.1208,15.78a22.7112,22.7112,0,0,0-16.075-6.7126,21.2393,21.2393,0,0,0-11.8059,3.2974A22.52,22.52,0,0,0,406.88,64.783a29.416,29.416,0,0,0-2.8853,13.278q0,8.0083,3.4741,11.7765T417.95,93.606q8.8324,0,19.3724-6.1238l-3.2974,16.2516A45.998,45.998,0,0,1,415.1828,107.62Z" transform="translate(-0.4961)" fill="#2d3748"></path><path d="M458.1224,14.2911H475.375l-8.95,46.0463L490.2134,39.964H512L482.2643,64.5769l18.43,41.3356H482.382L469.31,75.058l-6.83,5.6527-4.8284,25.2018H440.3987Z" transform="translate(-0.4961)" fill="#2d3748"></path></svg></a><svg height="20" class="cm3" viewBox="0 0 512 512"><rect x="10" y="10" width="492" height="90.4043" rx="17.383" stroke-width="20" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" fill="none"></rect><rect x="10" y="411.5957" width="492" height="90.4043" rx="17.383" stroke-width="20" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" fill="none"></rect><rect x="10" y="210.7979" width="492" height="90.4043" rx="17.383" stroke-width="20" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" fill="none"></rect></svg></div><nav class="menu-links yy sm-p4 sm-off"><a href="/documentation" class="sm-x12 sm-bcm2b p2 fs4 ci1:h yy"> Documentation </a><a href="/components" class="sm-x12 sm-bcm2b p2 fs4 ci1:h yy"> Components </a><a href="/contributors" class="sm-x12 sm-bcm2b p2 fs4 ci1:h yy"> Contributors </a><a href="https://github.com/nullstack/nullstack" target="_blank" rel="noopener" class="sm-x12 sm-bcm2b p2 fs4 ci1:h yy"> Source </a><a href="/pt-br" class="sm-x12 sm-bcm2b p2 fs4 ci1:h yy"> Português </a><button class="sm-x12 sm-bcm2b p2 fs4 ci1:h yy"> Night Mode </button></nav><div class="sm-x12 sm-p4x sm-off"><a href="/getting-started" class="xx sm-x12 bci1 bgi1 bgm1:h cm1 ci1:h p4x p2y">Get Started</a></div></div></header><section class="x sm-p4x sm-p10y md+p20y"><h1 class="x12 sm-fs6 md+fs8 m6b"> Context Data </h1><article><ul>

<li>Type: <code>object</code></li>

<li>Origin: <a href="/context#----component-context">Component Context</a></li>

<li>Availability: client</li>

<li>readonly in client context</li>

</ul>

It gives you information about the element dataset.

You can use this key to avoid polluting your DOM with invalid attributes.

💡 This helps Nullstack set attributes without wasting time validating them.

</blockquote>

Any <code>data-*</code> attributes will receive a respective camelized key on the <code>data</code> object.

You can assign <code>data</code> attributes both via <code>data-*</code> and a <code>data</code> key that accepts an object with camelized keys.

The kebab version is also available in the context.

<pre><code class="language-jsx">import Nullstack from 'nullstack';

class ContextData extends Nullstack {

count = 1;

calculate({data}) {

this.count = this.count * data.multiply + data.sum;

}

renderInner(context) {

const {data} = context;

return (

{data.frameworkName}

is same as

{context['data-framework-name']}

</div>

)

}

render({data}) {

return (

<div>

Calculate

</button>

</div>

)

}

export default ContextData;

</code></pre>

💡 Camelized keys from the <code>data</code> object will result in kebab attributes in the DOM.

</blockquote>

<h2 id="next-step"><a href="#next-step">Next step</a></h2>⚔ Learn about the <a href="/context-environment">context <code>environment</code></a>.

</article></section><footer class="xx m20t"><div class="x xr md+bcm2t yy md+p10y prtl"><a href="/waifu"><img src="/nullachan.png" alt="Nulla-Chan" title="Nulla-Chan: Nullstack's official waifu" class="pabl sm-p2l" height="160" loading="lazy"/></a><nav class="xr sm-x4 yy"><a href="https://www.youtube.com/channel/UCUNPaxoppH3lu6JTrUX78Ww" rel="noopener" target="_blank" class="sm-xr sm-m1y sm-x12 md+bci1 sm-bcm2t sm-p4t ci1 md+cm1:h md+bgi1:h p4x p2y md+m2x">YouTube</a><a href="https://twitter.com/nullstackapp" rel="noopener" target="_blank" class="sm-xr sm-m1y sm-x12 md+bci1 sm-bcm2t sm-p4t ci1 md+cm1:h md+bgi1:h p4x p2y md+m2x">Twitter</a><a href="https://github.com/nullstack" rel="noopener" target="_blank" class="sm-xr sm-m1y sm-x12 md+bci1 sm-bcm2t sm-p4t ci1 md+cm1:h md+bgi1:h p4x p2y md+m2x">GitHub</a></nav></div></footer></main></div>

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