<!DOCTYPE html>
<script type="text/javascript">
function oblicz() {
var m=parseDouble(document.getElementById('mass').value);
var r = 0;
var radio = document.getElementsByName('rodzaj');
if(radio[0].checked) {
r = 0.6;
} else if(radio[1].checked) {
r = 5.5;
} else if(radio[2].checked) {
r = 0.9;
} else if(radio[3].checked) {
r = 4.2;
} else if(radio[4].checked) {
r = 16.6;
} else if(radio[5].checked) {
r = 20.0;
} else if(radio[6].checked) {
r = 18.0;
} else if(radio[7].checked){
r = 1.95;
} else {
alert("Wybierz rodzaj materiału");
}
var z=document.getElementById('zysk');
z.value=m*r;}
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" type="text/css" href="css\kalkulator-css.css" />
<h1>Sprawdź ile zyskasz, oddając złom do nas:
</h1>
<input type="radio" class= "material" name="rodzaj" value="1" id="st">Stal
<br />
<input type="radio" class= "material" name="rodzaj" value="2" id="stn" />Stal nierdzewna
<br />
<input type="radio" class= "material" name="rodzaj" value="3" id="zel" />Żeliwo
<br />
<input type="radio" class= "material" name="rodzaj" value="4" id="alu" />Aluminium
<br />
<input type="radio" class= "material" name="rodzaj" value="5" id="mi" />Miedź
<br />
<input type="radio" class= "material" name="rodzaj" value="6" id="mo" />Mosiądz
<br />
<input type="radio" class= "material" name="rodzaj" value="7" id="bl" />Blacha ocynkowana
<br />
<input type="radio" class= "material" name="rodzaj" value="8" id="poj" />Pojazdy/resztki pojazdów
<br />
<input type="number" name="masa" value="x" id="mass"><br />
<input type="button" onclick="oblicz()" class="button" value="Oblicz" />
<input id="zysk" disabled="disabled" value=""/>
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