Numver Fortmat in JavaScript

ff-input-number-format.js

jQuery(document).ready(function($){
    //* #ff_10_value_1,#ff_10_value_2 are input field ID.
    $('#ff_10_value_1,#ff_10_value_2').on('keyup blur', function(){
        var value = $('#ff_10_sum_ff').val();
        //* #ff_10_sum_ff is the calcualtion field ID where value is showing
        $('#ff_10_sum_ff').val( numberFormat(value, 2, '.', ',') );
    });
});

function numberFormat (number, decimal_pos, decimal_sep, thousand_sep) {
    var ts      = ( thousand_sep == null ? ',' : thousand_sep )
        , ds    = ( decimal_sep  == null ? '.' : decimal_sep )
        , dp    = ( decimal_pos  == null ? 2   : decimal_pos )

        , n     = Math.floor(Math.abs(number)).toString()

        , i     = n.length % 3 
        , f     = ((number < 0) ? '-' : '') + n.substr(0, i)
    ;

    for(;i<n.length;i+=3) {
        if(i!=0) f+=ts;
        f+=n.substr(i,3);
    }

    if(dp > 0) 
        f += ds + parseFloat(number).toFixed(dp).split('.')[1]

    return f;
}

Keep in mind that comma will not work in Fluent Form numeric field. Because validation script is blocking it.