Develop Reference

Number decimal is displaying wrong [duplicate]

This question already has answers here:
javascript - how to prevent toFixed from rounding off decimal numbers
(7 answers)
Closed 5 years ago.
I am defining my numberfield and then I amgetting some value like this
val = 3.555678
I am using decimalPrecision : 3 in my number field so The value is displaying is 3.556
I want my value should be display 3.555 so for that I am using
val = val.toFixed(3);
val is coming in consol 3.555
then numberfield.setValue(val);
But in UI it is still comming 3.556
Why it is coming this.

I you want to display 3.555 you can do it in the following way
let val = 3.555678
let decimalPrecision = 3;
let roundedval = val.toFixed(3);
if(roundedval > val){
val = roundedval - Math.pow(10, -1*decimalPrecision);
}
console.log(val);

You can use:
var val=3.555678;
val = Math.floor (val*1000)/1000;
console.log(val);

Javascript wrong math [duplicate]

This question already has answers here:
Adding two numbers concatenates them instead of calculating the sum
(24 answers)
Closed 6 years ago.
I'm not sure what's wrong.
There are two variables, cena and uhrada. cena = 10 and uhrada = 279.8. I want to add them but I am getting 279.810 instead of 289.8.
Thanks for any help!
function priplatok(vstup1, vstup2) {
var chid = vstup1;
var cena = vstup2;
var uhrada = document.getElementById('uhr').value;
if (document.getElementById(chid).checked) {
var pridatu = uhrada + cena;
alert(pridatu);
}
}

The reason is that the values you take from the HTML input elements are always strings, even when they look like numbers. You have to first convert them, for instance with parseInt(...) or parseFloat():
var pridatu = parseFloat(uhrada) + parseFloat(cena);
A shorter way is to force conversion with a +:
var pridatu = +uhrada + +cena;
Although this is concise, you should probably first check if the input really is numeric. I refer to a popular question "Validate decimal numbers in JavaScript - IsNumeric()".

You get a string from document.getElementById('uhr').value.
If you want to do math, you need to cast the value either with parseInt(string, 10) or with parseFloat(string) to a number, implicit with a unary plus.
Your code:
function priplatok(vstup1, vstup2) {
var chid = vstup1;
var cena = vstup2;
var uhrada = +document.getElementById('uhr').value; // use implicit cast to number
if (document.getElementById(chid).checked) {
var pridatu = uhrada + cena;
alert(pridatu);
}
}

Thats because the values are strings and not numbers.
You have to make them numbers first and then calculate:
var pridatu = parseInt(uhrada) + parseInt(cena);

Adding Decimal Point [duplicate]

This question already has answers here:
Formatting a number with exactly two decimals in JavaScript
(32 answers)
Closed 7 years ago.
Here's the code
<script type="text/javascript">
$(document).ready(function(){
$('input.number')
.on("blur", function(e){
var $this = $(this);
var num = $this.val().replace(/(\d)(?=(\d{3})+(?!\d))/g, "$1,");
$this.val(num);
});
});
</script>
The output of that code is 10000 => 10,000
I want the output to be 10000 => 10,000.00
thanks..

You could also make use of toLocaleString with minimumFractionDigits property of its options argument.
numObj.toLocaleString([locales [, options]])
Example:
var number = 10000;
alert(number.toLocaleString('en-US', { minimumFractionDigits: 2 }));
Note: Supported by all modern browsers, except Safari (it seems)

Use this:
parseFloat(num).toFixed(2)
Like:
$this.val(parseFloat(num).toFixed(2));//output 1000.00
For comma separator use this SO ANSWER.
function commaSeparateNumber(val){
while (/(\d+)(\d{3})/.test(val.toString())){
val = val.toString().replace(/(\d+)(\d{3})/, '$1'+','+'$2');
}
return val;
}
var num = 10000;
console.log(commaSeparateNumber(parseFloat(num).toFixed(2)));// output 10,000.00
DEMO

How to remove $ from javascript variable? [duplicate]

This question already has answers here:
Closed 10 years ago.
Possible Duplicate:
Remove characters from a string
I have a variable p which I would like to remove the $ from. This variable will be a number such as $10.56. How can I do this? I thought it could be done using .replace('$','') but i'm not quite sure how to implement this.
Here is my javascript code:
function myFunction() {
var p = parseFloat(document.getElementById('p_input').value);
var q = parseFloat(document.getElementById('q_input').value);
if (!q){
document.getElementById('t').value = '';
}
else {
var t = q * p;
document.getElementById('t_output').value = t;
}
}

It's pretty simple:
var myString = "$15.62"
console.log(myString.replace('$', ''));
//Logs: "15.62"
Please note that this new value is not actually "saved" to myString, you'll have to assign it to a variable, yourself:
var newString = myString.replace('$', '');

Try this, assuming that the values of p_input and q_input will be the money values:
var p = parseFloat(document.getElementById('p_input').value.replace('$', ''));
var q = parseFloat(document.getElementById('q_input').value.replace('$', ''));

how to check "contains" using jquery [duplicate]

This question already has answers here:
How to check whether a string contains a substring in JavaScript?
(3 answers)
Closed 9 years ago.
I tried of checking contains option using jquery for the birthday but its getting exception
var _dob = "4/10";
// this line doesn't work
var _adob = _dob.contains('/') ? _dob.Split('/') : _dob.Split('-');
$('#Month').val(_adob[0]);
$('#Day').val(_adob[1]);
but i can't able to split.. its resulting in error on getting _adob itself

Try this:
var _dob = "4/10";
var _adob;
if (_dob.indexOf("/") >-1) {
_adob = _dob.split("/");
} else {
_adob - _dob.split("-");
}

Direct Answer
indexOf(something)>-1
var _dob = "4/10";
var _adob = _dob.indexOf('/')>-1 ? _dob.split('/') : _dob.split('-');
$('#Month').val(_adob[0]);
$('#Day').val(_adob[1]);
Indirectly
You really don't need to check that the string contains that... Using a regular expression, you can split on a -, /, or . by building a character set:
var _dob = '4.10';
var _aodb = _dob.split(new RegExp('[-/.]'));