Length of a value? Javascript

Javascript
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Hi.. I need to calculate the length of a numeric variable:

Code:

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value = 12345
len = value.length

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This doesn't work.. why? Whats wrong?
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Code:

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function len(val){
    var str = new String(val);
    return str.length;
}

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Whats wrong here? I need to format a value.
Example:

Before: 1000
After : 1.000

Code:

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function NumForm(valor){
  numval = valor;
  len = String(numval);
  len = len.length;

  if (len >= 3){
    while (len > 0){
      TempString = numval.substring(len - 3, len);    // <-- Error
      if (TempString.length == 3){
        OutString = "." + TempString + OutString;
        len = len - 3;
      }
      else{
        OutString = TempString + OutString;
        lenx = 0;
      }
    }
    if (OutString.substring(0, 1) == ".")
      numval = OutString.substring (1, OutString.length);
    else
      numval = OutString;
  }
  return (numval);
}

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Code:

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function NumForm(valor){
  numval = String(valor); //create a new string object
  len = numval.length; //get it's length
  .
  .

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Yes! Thanks! It worked!

Quote:

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DeadEyes
function len(val){
var str = new String(val);
return str.length;
}

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Simpler:

Code:

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var value = 12345;
var len = String(value).length;

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Quote:

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Evolute
Before: 1000
After : 1.000

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You havn't really described how you want it formatted, so can only assume you want a scientific notation type of format.

Code:

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var value = 1000;
value = String(value).substring(0, 1) + "." + String(value).substring(1);

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or, if you want to keep the variable as a numeric value (but will not retain uneeded zeros)

Code:

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var value = 1000;
while (value >= 10) value /= 10;

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Thanks a lot!