JSFiddle - React, Tailwind, and code Playground

HTML

<div class="b-oneColumn w-text">
    <div class="e-text1">
        <textarea id="mce_0" class="tiny" rows="10" ria-hidden="true">Some text here</textarea>
        <span id="mce_0_parent" class="mceEditor defaultSkin">.....</span>
    </div>
</div>
<button id="b1">Click</button>

JavaScript

function processTextForServer(widget) {
    var myText = 'mycontent';
    var tmp = widget.clone(true, true);
    $('#mce_0', tmp).text(myText);
    $('.mceEditor', tmp).remove();
    var widgetHtml = $(tmp).html();
    alert(widgetHtml);
}

$('#b1').click(function() {
    processTextForServer($('.w-text'));
});