We have a form with 2 fields and a button. We want on button click to output random int number (like 3, 5 or 33) which would lie between int A and int B? (no use of jQuery or anything like it is required)
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3 Answers
You can use Javascript Math.random
function randomInRange(start,end){
return Math.floor(Math.random() * (end - start + 1) + start);
}
3 Comments
Rella
give it 33 and 44 and get 4=)
Samet Atdag
I called this function in a 1000 times for loop, all gives results in between 33 and 44.
Sergey Sob
@rella you can't get 4 as result sum of positive number and 33. you will get at least 33 :)
Use something like Math.floor(Math.random()*(intB-intA +1)) + intA ?
answered Dec 29, 2010 at 23:41
Sebastiaan van den Broek
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Comments
Like this:
Math.floor(a + Math.random() * (b - a))
The Math.random() method returns a random floating-point number in the range [0,1) — that is, between 0 (inclusive) and 1 (exclusive).
1 Comment
Michael Lorton
I think (re-reading both the question and the code carefully) the OP might want to multiply
(b + 1 - a) not (a - b).