Good Night, I have a problem with my JS code, I ask him to check if the fields are empty, but when I execute the function with the empty field, it does not deal with it, it simply ignores the if's, validate, but what I think are examples very similar to what I did
Follow the code in Js and below the HTML
function calculaBask(){
var numA = parseFloat(document.getElementById('a').value),
numB = parseFloat(document.getElementById('b').value),
numC = parseFloat(document.getElementById('c').value),
delta = null,
x1 = null, x2 = null;
/* TRATATIVAS */
//ver se nao esta vindo numeros nulos
if(numA == '' || numA == null){
alert("Digite um numero valido para continuar.");
return false;
}
if(numB == '' || numB == null){
alert("Digite um numero valido para continuar.");
return false;
}
if(numC == '' || numC == null){
alert("Digite um numero valido para continuar.");
return false;
}
//recebendo o valor de delta
delta = numB * numB - 4 * numA * numC;
//pegando a raiz de delta
raizDelta = Math.sqrt(delta);
//Calculando primeira raiz
x1 = (-numB + raizDelta) / 2 * numA ;
//calculando segunda raiz
x2 = (-numB - raizDelta) / 2 * numA;
document.getElementById('raiz1').value = x1;
document.getElementById('raiz2').value = x2;
document.getElementById('bd').value = delta;
}
<header class="container">
<h1 style="text-align:center;">Calcule Baskhara</h1>
</header>
<section class="container box-space secao-input">
<label>Digite A:
<input id="a" type="text" placeholder="">
</label>
<label>Digite B:
<input id="b" type="text" placeholder="">
</label>
<label>Digite C:
<input id="c" type="text" placeholder="">
</label>
</section>
<div class="container box-space results">
<label class="label-rs">Raiz 1:
<input id="raiz1" type="text">
</label>
<label class="label-rs">Raiz 2:
<input id="raiz2" type="text">
</label>
<label class="label-rs">Binomio discriminante:
<input id="bd" type="text">
</label>
<button onclick="calculaBask()" id="botao">Calcular</button>
</div>
<script src="js/script.js"></script>