Javascript with xlt formatting error

Question

I'm using javascript to pad numbers in my xslt file. but when debugging I get an error saying.

Extension function parameters or return values which have Clr type 'ConcatString' are not supported.

How can I fix this?

xslt

<xsl:template name="padNumber">
    <xsl:param name="value"></xsl:param>
    <xsl:param name="length"></xsl:param>
    <xsl:value-of select="user:PadDigits($value,$length)"/>
  </xsl:template>

javascript

function PadDigits(n, totalDigits)
{
    n = n.toString();
    var pd = '';
    if (totalDigits > n.length)
    {
        var i;
        for (i=0; i<(totalDigits-n.length); i++)
        {
            pd += '0';
        }
    }
    pd = pd + n.toString();
    return pd;
}

Answer 1

Change your PadDigits to return strings:

return "" + pd;