Question

Possible Duplicate:
Is JavaScript’s Floating-Point Math Broken?
Rounding a float in JavaScript

Why this function increase wrong decimal values? I want to show only one decimal.

var valueElement = $('#valueTempe');
function incrementValue(e){
    if(valueElement.text() < 6){
        valueElement.text(Math.max(parseFloat(valueElement.text()) + e.data.increment)); 
    }

    return false;
}
$('#plus').bind('click', {increment: 0.1}, incrementValue);     
$('#minus').bind('click', {increment: -0.1}, incrementValue);

jsFiddle: Test

Answer 1

You can use .toFixed(1) as below

var valueElement = $('#valueTempe');
function incrementValue(e){
    if(valueElement.text() < 6){
        valueElement.text(Math.max(parseFloat(valueElement.text()) + e.data.increment).toFixed(1)); 
    }
    if(valueElement.text() == 6){
        valueElement.text(Math.max(parseFloat(valueElement.text()) -1).toFixed(1));
    }
    return false;
}


$('#plus').bind('click', {increment: 0.1}, incrementValue);     
$('#minus').bind('click', {increment: -0.1}, incrementValue);

Demo