JSFiddle - React, Tailwind, and code Playground
by dying_sakura
HTML
<script>
function setText7(obj){
var val = obj.value;
console.log(val);
document.getElementById('textBox').value = val;
}
</script>
<input type="button" name="btnSeven" id="btnSeven" value="7" onclick="setText7(this)">
<input type="number" name="textBox" id="textBox" value=""/>