<form action="#"></form>
<label for="First-name">First name: </label>
<input type="text" id="First-name" placeholder="Please insert fiid."><br>
<label for="Second-name">Second name: </label>
<input type="text" id="Second-name" placeholder="Please insert second name"> <br>
<label for="Passenger-weight">Passengers weight: </label>
<input type="number" class="weight" id ="Passenger-weight" placeholder="Please enter passengers weight"><br>
<label for="cargo-weight">cargo weight: </label>
<input type="number" class="weight" id ="cargo-weight" placeholder="Please enter cargo weight"><br>
<input type="submit" id ="submit" ><br>
</form>
<p id="sum"></p>
<div id="sumoftotal"></div>
<body>
<script language="JavaScript">
document.getElementById("submit").onclick=function (){
let firstName = document.getElementById("First-name").value;
let lastName= document.getElementById("Second-name").value;
let num1 = document.getElementById("Passenger-weight").value;
let num2 = document.getElementById("cargo-weight").value;
let total =parseInt(num1) + parseInt(num2);
document.getElementById("sum").innerHTML=(`${firstName} ${lastName} ${total }`)
}
</script>
</body>
my problem can be numbered: number 1: when I press the submit button, input values show up, BUT when I want to insert a different data, the previous one disappear. I studied about it, because whatever comes in the function scope become local we cannot apply it outside, BUT I don't know how to change it. number 2: I want to have the sum of total weights I insert at the end of my list, I know we can do this by loop, BUT I need something simpler and more preliminary because I am a novice and it would be a big jump for the time being. all in all, I would be happy if anyone could help me.
Here is the primary and most basic approach.
var data = document.getElementById('data');
var weightElement = document.getElementById('total-weight');
document.getElementById("submit").onclick = function() {
/* Getting data */
let firstName = document.getElementById("First-name").value;
let lastName = document.getElementById("Second-name").value;
let num1 = document.getElementById("Passenger-weight").value;
let num2 = document.getElementById("cargo-weight").value;
let total = parseInt(num1) + parseInt(num2);
/* Appending element */
data.innerHTML = data.innerHTML + `First Name - ${firstName}, Last Name - ${lastName}, Weight - ${total} <br/>`;
weightElement.innerHTML = parseInt(weightElement.innerHTML) + total;
}<body>
<form action="#"></form>
<label for="First-name">First name: </label>
<input type="text" id="First-name" placeholder="Please insert fiid."><br>
<label for="Second-name">Second name: </label>
<input type="text" id="Second-name" placeholder="Please insert second name"> <br>
<label for="Passenger-weight">Passengers weight: </label>
<input type="number" class="weight" id="Passenger-weight" placeholder="Please enter passengers weight"><br>
<label for="cargo-weight">cargo weight: </label>
<input type="number" class="weight" id="cargo-weight" placeholder="Please enter cargo weight"><br>
<input type="submit" id="submit"><br>
</form>
<div id="data"></div>
<div>Total weight = <span id="total-weight">0</span></div>
</body>