Menu
JavaScript to Generate a Random Number Between X and Y

You can use the JavaScript Math object's .random() method to generate a random number between two values, but because it returns a (pseudo) random floating-point number between 0 and 1 (but not including 1), you'll need to perform some additional operations on it to scale it to your required range.

To generate a random integer between two values x and y use the code shown below:

Math.floor((Math.random() * y) + x);

x being the lowest value, and y being the highest value.

For example if you wanted to generate a random integer between 1 and 8, you would use:

Math.floor((Math.random() * 8) + 1);

The Math.floor() function returns the largest integer less than or equal to the passed argument.

If the lowest random integer that you require is 0, you can simplify the statement as shown below:

Math.floor(Math.random() * max);

To generate a random floating-point number between two values x and y you would use the code shown below:

return Math.random() * (max-min) + min;


Learn more at amazon.com

More Java Script Code:
• Using a Select List for Navigation
• JavaScript Code to Restrict Keyboard Entries
• Basic State Machines
• Concatenating a String and Another Data Type
• Regular Expression Position Matching
• How Far Did the User Scroll?
• Date Picker For Your Web Site
• Introduction to HTML5 Canvas
• How to Use HTML5 canvas arc and arcTo Functions
• Easy JavaScript FileReader Code