Allow only two digits after decimal in javascript

Question

I have a variable i=28.57142857142857; I want to alert(i); alert this variable on user screen. But I want only two digits after decimal. ie 28.57

How to do it.

Answer 1

try using toFixed:

 alert(i.toFixed(2));

If you need the precision mentioned in the next answer from Jappie , you could overwrite the native toFixed method like this:

Number.prototype.toFixed = function (precision) {
 var power = Math.pow(10, precision || 0);
 return String(Math.round(this * power) / power);
};

Answer 2

How about

alert(Math.round(i * 100) / 100);

There are problems with toFixed. See this post .

Answer 3

100% working!!!!

 <html> <head> <script> function replacePonto(){ var input = document.getElementById('qtd'); var ponto = input.value.split('.').length; var slash = input.value.split('-').length; if (ponto > 2) input.value=input.value.substr(0,(input.value.length)-1); if(slash > 2) input.value=input.value.substr(0,(input.value.length)-1); input.value=input.value.replace(/[^0-9.-]/,''); if (ponto ==2) input.value=input.value.substr(0,(input.value.indexOf('.')+3)); if(input.value == '.') input.value = ""; } </script> </head> <body> <input type="text" id="qtd" maxlength="10" style="width:140px" onkeyup="return replacePonto()"> </body> </html>

Allow only two digits after decimal in javascript

Question

3 answers

solution1
4 ACCPTED 2010-06-04 08:59:45

solution2
2 2010-06-04 09:01:12

solution3
0 2017-05-05 20:33:59

Allow only two digits after decimal in javascript

Question

3 answers

solution1 4 ACCPTED 2010-06-04 08:59:45

solution2 2 2010-06-04 09:01:12

solution3 0 2017-05-05 20:33:59

solution1
4 ACCPTED 2010-06-04 08:59:45

solution2
2 2010-06-04 09:01:12

solution3
0 2017-05-05 20:33:59