JSFiddle - React, Tailwind, and code Playground

HTML

<input id='test' type="text" placeholder="0.0" />
<button>click</button>
<span></span>

JavaScript

function test(){
var result = true;
$("input").each(function() {
        if (!this.value) {
            this.value = 0;
        }
        
        if(jQuery.isNumeric(this.value) && this.value>=0){
            
        }else{
            result = false;
        }
    });
    return result;
}

$('button').click(function(){
    var finalValue = $('#test').val();
    var testInput = test();
    if(testInput){
         $('span').text(finalValue);
    }
});