JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" value="" id="delterms" name="O_" />
<input type="checkbox" id="checkbox" onchange="terms(event)" />
<script type="text/javascript">
    
</script>

JavaScript

function terms(e) {
    var el = e.srcElement;
    if (el.checked == false) {
        document.getElementById('delterms').value = ''
    }
    else {
        document.getElementById('delterms').value = 'Accepted'
    }
}