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So, say I have a number, c, and when I click a button it randomly increases by another number, b, which is any number between 1-10. I have tried math.floor(math.random()) and document-getElementById('#id').innerhtml="". Please help, preferably save c as a variable. Thanks.

user2936538
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    Show us the code that you have. – Tyler Jan 07 '14 at 22:18
  • possible duplicate of [Generate random value between two numbers in Javascript](http://stackoverflow.com/questions/4959975/generate-random-value-between-two-numbers-in-javascript) – Niet the Dark Absol Jan 07 '14 at 22:19
  • I've suggested you an implementation for that random number generator functionality, but update your answer with more code so we can help you out. – João Pinho Jan 07 '14 at 22:39

1 Answers1

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You need to use 

Math.floor(1 + Math.random() * 10)

Math.random() generates a random number between 0 and 1 (except) [0,1[. Here further info about Math.random(): http://www.w3schools.com/jsref/jsref_random.asp

var c = 120;

window.addEventListener("load",function(){

   document.getElementById('btnRandom').addEventListener("click",function(){

        //this code goes inside click event function
        var b = c + Math.floor(1 + Math.random() * 10);
        document.getElementById('results').innerHTML= "random: " + b;

   }, false);

}, false);


<div id="results"></div>
<input type="button" id="btnRandom" value="Random"/>

And a JSFiddle: http://jsfiddle.net/TRSZj/

Regards.

João Pinho
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    `math` is undefined. `Math` is what you need ;) – Niet the Dark Absol Jan 07 '14 at 22:19
  • You may want to be a bit more specific about what `Math.random()` does. Your current statement implies that `11` is a possible result. – Niet the Dark Absol Jan 07 '14 at 22:20
  • True! I've heard that a lot here at SO, never had any trouble with their content dough.. I mainly use it to check things about CSS properties, and JavaScript Native... but that's not my only source :) , with so many sources of info, most of the times I complete the lack of info with knowledge from books. – João Pinho Jan 07 '14 at 22:29
  • I always start my JS doc lookups with "MDN" :3 – Niet the Dark Absol Jan 07 '14 at 22:31
  • Nice... Guess I've been living under a rock... Nice source will follow your advice for sure! – João Pinho Jan 07 '14 at 22:33
  • Okay, I already know how to use Math.floor((Math.random()*10)+1); – user2936538 Jan 08 '14 at 23:07
  • But I need to know how to have you click a button, and it adds between 1-10 to the total _c_. preferable that total is a variable...and I should be able to use document.getElementById('#id').innerhtml=""; to show "You have _c_ objects" – user2936538 Jan 08 '14 at 23:10
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    hmmm, you put: var b = candy **+** .... :( you should have put a **+=** instead of a **+** – user2936538 Jan 13 '14 at 23:48