boolean logic - Odd JavaScript Behavior When Comparing Numbers Larger than 1000 -

i wrote javascript function supposed check if amount greater 0 , less amount. example, if total amount due $800.00, , user tries pay $1100, want function first check amount being paid ($1100) greater 0 (true) , amount being paid less total amount due (false). pretty sure logic fine, function hasn't been working correctly:

function validate_payment_amount() {     var payment_amt = get_amount_paying(); // 1100.00     var amt_due = get_amount_due(); // 800.00      console.log('is ' + payment_amt + ' greater 0?: ' + (payment_amt > 0));     console.log('&&');     console.log('is ' + payment_amt + ' less or equal ' + amt_due + '?: ' + (payment_amt <= amt_due));      return payment_amt > 0 && payment_amt <= amt_due; } 

the function evaluates correctly if payment_amount less 1000, here console output:

is 999.00 greater 0?: true &&    999.00 less or equal 892.50?: false 

so above works fine. however, when give number greater 1000, console displays:

is 1001.00 greater 0?: true && 1001.00 less or equal 892.50?: true 

can please shed light on this?

edit: get_amount_paying() , get_amount_due():

function get_amount_due() {     return parsefloat($("#still_due").data('amount')).tofixed(2); }  function get_amount_paying() {     return parsefloat($("#make_payment").val()).tofixed(2); } 

your output gives away fact strings - printing actual number type never have extraneous 0s. seeing 892.50 when printing number impossible.

.tofixed() returns string, not number btw.

it works > 0, because when comparing string > number, string automatically parsed number before comparison.

it doesn't work payment_amt <= amt_due because both strings, string comparison done , nothing parsed numeric value.

try

function get_amount_due() {     return parsefloat($("#still_due").data('amount')) }  function get_amount_paying() {     return parsefloat($("#make_payment").val()) } 

the difference removal of tofixed, useless here.