[javascript] Why does Firebug say toFixed() is not a function?

I am using jQuery 1.7.2 and jQuery UI 1.9.1. I am using the code below within a slider. (http://jqueryui.com/slider/)

I have a function that should test two values and depending on the difference between the two values reformat them (to the appropriate decimal place). If the difference is greater than 10, I will parse out the integer. If the difference is greater than 5, it should keep one decimal. Everything else, I will keep two decimals.

When I enter two values that have a difference that is ten or less, I use the toFixed() function. And, in Firebug, I see an error:

TypeError: Low.toFixed is not a function
Low = Low.toFixed(2);

Is there something simple that I am doing wrong?

Here is my code:

var Low = $SliderValFrom.val(),
High = $SliderValTo.val();

// THE NUMBER IS VALID
if (isNaN(Low) == false && isNaN(High) == false) {
    Diff = High - Low;
if (Diff > 10) {
      Low = parseInt(Low);  
  High = parseInt(High);    
} else if (Diff > 5) {
       Low = Low.toFixed(1);
       High = High.toFixed(1);
} else {
       Low = Low.toFixed(2);
   High = High.toFixed(2);
}
}

You need convert to number type:

(+Low).toFixed(2)

Low is a string.

.toFixed() only works with a number.

A simple way to overcome such problem is to use type coercion:

Low = (Low*1).toFixed(..);

The multiplication by 1 forces to code to convert the string to number and doesn't change the value.

That is because Low is a string.

.toFixed() only works with a number.

Try doing:

Low = parseFloat(Low).toFixed(..);

In a function, use as

render: function (args) {
    if (args.value != 0)
        return (parseFloat(args.value).toFixed(2));


},