JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://code.jquery.com/jquery-1.11.1.js"></script>
<div id="defaultdata" data-data='{"yestext":"Yes please, thank you!", "yesclass":"yesstyle", "notext":"No thank you..", "noclass":"nostyle"}'></div>
<div id="someelement"></div>

JavaScript

var someclass = 'yes';
var someelement = $("#someelement");
var defaultData = $('#defaultdata').data('data');

if (someclass == 'yes') {
    someelement.text(defaultData.yestext);
    someelement.removeClass(defaultData.noclass);
    someelement.addClass(defaultData.yesclass);
} else {
    someelement.text(defaultData.notext);
    someelement.removeClass(defaultData.yesclass);
    someelement.addClass(defaultData.noclass);
}