CODEWITHSUNDEEP
javascript
XxGamingTownxX
XxGamingTownxX

Reputation: 21

How can I add money?

I'm having trouble, I'm a new programmer (obviously) and I was wanting to make a wallet program to keep track of my money since I don't have a bank account. I want my money to add up correctly, but it just combines the words. Also I wanna know how to store that number, so when I leave and come back it'll be the same number.

Heres my code: (Very bad and prototype)

<HTML>
<HEAD>
<TITLE> JavaScript Wallet </TITLE>
</HEAD>
<BODY>
<h2>Wallet</h2>

<script language="Javascript">

var plusCash = prompt("How much money are you entering?");

var money = 0.00;

var money = money + plusCash;

document.write("You have $" + money);
</script>


</BODY>
</HTML>

Upvotes: 0

Views: 687

Answers (2)

Dai
Dai

Reputation: 155045

To persist values between pages and browser sessions, you can use either cookies for short simple values, or localStorage, which was introduced in the HTML5-wave of platform enhancements.

Cookies would not be ideal in this situation because I'm guessing you're using HTML files on disk, therefore localStorage would be better.

localStorage is used thusly:

window.localStorage['someValue'] = someOtherValue;

localStorage can only store strings, not complex types (objects). You must 'stringify' / serialize them first, but this is easy:

window.localStorage['someObject'] = JSON.stringify( someObjectValue );

Note this code requires a fairly modern browser (think IE10, Chrome or recent builds of Firefox).

Upvotes: 2

Niels Keurentjes
Niels Keurentjes

Reputation: 41958

Since prompt returns a string value, 'adding' that to a float results in a string - Javascript implicitly converts the float since it gives least data loss. To treat plusCash as a float value, invoke parseFloat on it:

var money = money + parseFloat(plusCash);

Upvotes: 4

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