Edit fiddle - JSFiddle - React, Tailwind, and code Playground

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HTML

<textarea name='texto1' id="txtBriefing" rows="5" style="font-family: Trebuchet MS; font-size: 16px; width: 394px; height: 100px" onkeyup="javascript: doSomething(this)" ></textarea>
<input name="btnEnvia" id="btnEnvia" type="submit" value="Enviar" style="font-family: Trebuchet MS; font-size: 20px" disabled="disabled" />

JavaScript

window.doSomething = function(input) {
    document.getElementById('btnEnvia').disabled = (input.value.length == 0);
}

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JSFiddle - React, Tailwind, and code Playground

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JavaScript

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Use pre-released features

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