JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" name="attribute:name" ID="attribute:index" value="attribute:value" onKeyUp="myfunction('attribute:index')" />

JavaScript

function myfunction(sourceObject) {
    el = document.getElementById(sourceObject)
    el.value = el.value.replace(/</g, '')
    el.value = el.value.replace(/>/g, '')
    var inputTextString = ""

    var inputTextString = el.value.toUpperCase();
}