Adding a value when clicking button

Question

I want to add 10 to 0 every time I click a button and show it on the screen. I've tried everything but I can't get it to work.

This belongs to a longer code:

var bet = 0;
pen.fillText('Bet: ' + bet, 350, 390);

function reactToBetIncrease() {
    bet += 10;
}

It would be helpful if you would include the portion of code where you actually call the function reactToBetIncrease(). The calling context will matter a lot in your case. Is the bet variable a global (part of the window object)? — Tanzeel Kazi
– Tanzeel Kazi, Commented Dec 5, 2012 at 11:19
perhaps you need to display the new value as well? You don't seem to do that. — John Dvorak
– John Dvorak, Commented Dec 5, 2012 at 11:19

karaxuna · Accepted Answer · 2012-12-05 11:20:12Z

3

var bet=0;

pen.fillText('Bet: '+bet,350,390);

function reactToBetIncrease()

{

    bet += 10;
    pen.fillText('Bet: '+bet,350,390);
}

answered Dec 5, 2012 at 11:20

karaxuna

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7 Comments

Goldenvale Over a year ago

Another question. When I click the button the numbers overlap, how do I remove the old one?

Goldenvale Over a year ago

pen.font = '20pt Calibri'; pen.fillText('Inzet: '+inzet,350,390);

karaxuna Over a year ago

this is very simple in generic, it's done like this: element.value+=10;

Goldenvale Over a year ago

var pen=c.getContext("2d");

karaxuna Over a year ago

oh you are using canvas, that's another question, I don't know much about canvas

|

Aesthete · Accepted Answer · 2012-12-05 11:21:32Z

0

HTML

<button id="myButton">

JavaScript

var bet = 0;
$("#myButton").click(function() { bet += 10; });

Note: I don't know what your pen object is, nor what library it's from. It may require a single call on update - in which case it should live in the click callback. Otherwise it may require a call each frame. Since you haven't specified exactly what it does, I've left this out.

answered Dec 5, 2012 at 11:21

Aesthete

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3 Comments

John Dvorak Over a year ago

note that this alone won't affect the display in any way. It's still useful if attaching the handler was a problem.

Aesthete Over a year ago

@JanDvorak - I have no idea what pen is. And the question seemed like the handler was the problem, that's why I answered it.

John Dvorak Over a year ago

And yet if it was polling the variable (bad idea) then most likely it wouldn't be passed a string generated from the variable.

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