Allow only numbers and dot in script

Use Jquery instead. Add a decimal class to your textbox:

<input type="text" class="decimal" value="" />

Use this code in your JS. It checks for multiple decimals and also restrict users to type only numbers.

$('.decimal').keyup(function(){
    var val = $(this).val();
    if(isNaN(val)){
         val = val.replace(/[^0-9\.]/g,'');
         if(val.split('.').length>2) 
             val =val.replace(/\.+$/,"");
    }
    $(this).val(val); 
});​

Check this fiddle: http://jsfiddle.net/2YW8g/

Hope it helps.

This is a great place to use regular expressions.

By using a regular expression, you can replace all that code with just one line.

You can use the following regex to validate your requirements:

[0-9]*\.?[0-9]*

In other words: zero or more numeric characters, followed by zero or one period(s), followed by zero or more numeric characters.

You can replace your code with this:

function validate(s) {
    var rgx = /^[0-9]*\.?[0-9]*$/;
    return s.match(rgx);
}

That code can replace your entire function!

Note that you have to escape the period with a backslash (otherwise it stands for 'any character').

For more reading on using regular expressions with javascript, check this out:

• http://www.regular-expressions.info/javascript.html

You can also test the above regex here:

• http://www.regular-expressions.info/javascriptexample.html

---

Explanation of the regex used above:

• The brackets mean "any character inside these brackets." You can use a hyphen (like above) to indicate a range of chars.

• The * means "zero or more of the previous expression."

• [0-9]* means "zero or more numbers"

• The backslash is used as an escape character for the period, because period usually stands for "any character."

• The ? means "zero or one of the previous character."

• The ^ represents the beginning of a string.

• The $ represents the end of a string.

• Starting the regex with ^ and ending it with $ ensures that the entire string adheres to the regex pattern.

Hope this helps!