I want to retrive a number value from a div and then round that number to 2 decimal places using jQuery.
So far I have the element name and value:
<div class="value">Price = £133.3223443</div>
I am using the toFixed() method to convert a number into a string then round to 2 decimal places:
var inNum = 12345.6789;
inNum.toFixed(2);
However, I am having trouble trying to read a number within the element on the page (ignoring 'Price'), rather than just rounding a number entered within the jQuery.
Parse it with regexp? :)
http://jsfiddle.net/LERFB/2/ <--- working fiddle
var price = $('div.value').text();
var parsedPrice = parseFloat(price.replace(/([^0-9\.])/g, ''));
alert(parsedPrice.toFixed(2));
You can use text() to get the value from the element, and the split() by £ to get the numerical price. Try this:
var inNum = parseFloat($('.value').text().split('£')[1]).toFixed(2);
Example fiddle
Obviously you will also need some form of verification to ensure that there is a £ character in the string to split by, and that the value retrieved is numerical.
The following regular expression will extract the floating numbers from the string and do a toFixed operation.
var inNum = parseFloat($(".value").text().match(/[\d\.\d]+/i)).toFixed(2);
Please make sure you have the value inside the container all the time.
Related
I am not able to change string from innerHTML to number with javascript, the innerHTML of the element is like 1.2.34, I have tried ParseFloat, ParseInt and Number functions, they are working but only for the string(innerHTML) which is in the form of 1.23 means having only one decimal point, but in my case I have more than 1, 2 decimals and not able to change them in js. PLEASE help me fix this problem.
parseFloat, parseInt can be applied only for the text or number having proper decimal format. ex : 100,1.24,100.24,100.254 but you are trying with 1.2.4 which is not a valid decimal formats, when you try to parse this invalid format with int or float, the JS will consider as invalid arguments for the parseInt or parseFloat.
So i am considering the innerHtml as hh.mm.ss paster the code snippet as below
var time = '1.24.3'; // input string from innerHtml
var timearray = time.split('.'); // split it with .
// You can multiply hours to seconds or minutes
var totalminutes = (+timearray[0]) * 60 + (+timearray[1]);
//then you can add the every time and divide by n
-->You logic goes here
I am making a basic game, and I have a tile system that I'm using. Each tile has an ID of "tileX", where X is a number (ex. tile1). I have a function as follows:
window.onclick = function() {
var x = event.clientX, y = event.clientY,
elementMouseIsOver = document.elementFromPoint(x, y).id;
document.getElementById("tileTell").value = elementMouseIsOver;
console.log(elementMouseIsOver);
console.log(typeof(elementMouseIsOver));
elementMouseIsOver = parseInt(elementMouseIsOver);
console.log(elementMouseIsOver);
console.log(typeof(elementMouseIsOver));
}
Line 4 of code there fills in an input field so I can visually see which tile I've clicked (I'm using this to make sure things are working properly and so I can find the tiles I need). That works fine. On line 5 when I do a console.log, it gives me the proper ID, and verifies that it is a string.
After that I want to reset the elementMouseIsOver variable to be an integer, so if the ID was tile1 I would expect the new result to be 1. But when I look at it in the console, I get NaN. And then when I check the type of it immediately after that, I get number.
The parseInt does not seem to be working properly, what am I doing wrong? I need to use the ID names of each tile for mathematical operations so this is vital to my game. I know it's probably a really dumb mistake but I am completely at a loss...
If you want parseInt() to work on strings in the way you're using it, it has to start with a digit; in your case, it starts with alphabetical characters, and so (with an implicit radix of 10) it will rightfully return NaN.
You could get the number out by using a generic method:
var num = +(elementMouseIsOver.match(/\d+/) || [])[0];
It matches the first group of digits it can find and then uses the unary plus operator to cast it into an actual number value. If the string doesn't contain any digits, it will yield NaN.
In your particular case, you could also apply parseInt() on the part that immediately follows "tile":
var num = +elementMouseIsOver.substr(4);
NaN is correct.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/parseInt
If parseInt encounters a character that is not a numeral in the specified radix, it ignores it and all succeeding characters and returns the integer value parsed up to that point.
Nothing parsed successfully.
EDIT
You could accomplish what you want by removing the non-numeric characters from the string, assuming you'll always have a string+integer as the ID. Try this:
parseInt(elementMouseIsOver.replace(/[^\d]/,""))
You need to remove the "tile" string first, so it can properly parse the value:
elementMouseIsOver = parseInt(elementMouseIsOver.substring("tile".length));
.substring("tile".length) returns a substring starting with the character after "tile" (position 4 in the string, count starts at 0), resulting in only the number of the ID (as a string).
fiddle: http://jsfiddle.net/rk96uygd/
The typeof of a NaN is number.
Use isNaN() to test if a value is NaN or Not a Number
https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/isNaN
You could also use the Number() cast instead of parseInt().
you trying to parseInt on a element ID that is non-numeric, when parse fail it will return NaN (*or not a number*)
elementMouseIsOver = parseInt(elementMouseIsOver);
moreover, your elementMouseIsOver is an ID of control, I don't think .value can get the value of control
elementMouseIsOver = document.elementFromPoint(x, y).id;
I have a simple app that allows me to caculate the total amount invoiced and deposited in a route. However I want to allow the user to input multiple values in a single input field; e.g:
500+50+36.5-45.2-10.
I have written a function that will retrieve this input and then split this string into elements of an array at the + sign and immediately parse the values to numbers and then add them and return the total the user inputs into each individual field. This is all well as long as the user does no use any sign other than +.
I have searched the use of regexp:
regular expression in javascript for negative floating point number result stored in array
Javascript Regular expression to allow negative double value?
but none of the results seem to work.
How could I make my code retrieve the values so that the negative values get passed into the array as negative values?
Here is a snippet of my Js code:
For the full code, visit my fiddle.
totalInvoiced: function () {
var a = A.invoiced.value;
var value1Arr = [];
value1Arr = a.split("+").map(parseFloat);
var value1 = 0;
value1Arr.forEach(function (value) {
value1 += value;
});
I really like PhistucK's solution, but here an alternative with regex:
value1Arr = a.split(/(?=\+|\-)/);
This will split it, but keeps the delimiter, so the result will be:
["500", "+50", "+36.5", "-45.2", "-10"]
A bit dirty, but maybe a.replace(/-/g, "+-").split("+"), this way, you add a plus before every minus, since the negative numbers just basically lack an operator.
You can use this pattern that splits on + sign or before - sign:
var str = '500+50+36.5-45.2-10';
console.log(str.split(/\+|(?=-)/));
I am just dipping my toe into the confusing world of javascript, more out of necessity than desire and I have come across a problem of adding two integers.
1,700.00 + 500.00
returns 1,700.00500.00
So after some research I see that 1,700.00 is being treated as a string and that I need to convert it.
The most relevant pages I read to resolve this were this question and this page. However when I use
parseInt(string, radix)
it returns 1. Am I using the wrong function or the an incorrect radix (being honest I can't get my head around how I decide which radix to use).
var a="1,700.00";
var b=500.00;
parseInt(a, 10);
Basic Answer
The reason parseInt is not working is because of the comma. You could remove the comma using a regex such as:
var num = '1,700.00';
num = num.replace(/\,/g,'');
This will return a string with a number in it. Now you can parseInt. If you do not choose a radix it will default to 10 which was the correct value to use here.
num = parseInt(num);
Do this for each of your string numbers before adding them and everything should work.
More information
How the replace works:
More information on replace at mdn:
`/` - start
`\,` - escaped comma
`/` - end
`g` - search globally
The global search will look for all matches (it would stop after the first match without this)
'' replace the matched sections with an empty string, essentially deleting them.
Regular Expressions
A great tool to test regular expressions: Rubular and more info about them at mdn
If you are looking for a good tutorial here is one.
ParseInt and Rounding, parseFloat
parseInt always rounds to the nearest integer. If you need decimal places there are a couple of tricks you can use. Here is my favorite:
2 places: `num = parseInt(num * 100) / 100;`
3 places: `num = parseInt(num * 1000) / 1000;`
For more information on parseInt look at mdn.
parseFloat could also be used if you do not want rounding. I assumed you did as the title was convert to an integer. A good example of this was written by #fr0zenFry below. He pointed out that parseFloat also does not take a radix so it is always in base10. For more info see mdn.
Try using replace() to replace a , with nothing and then parseFloat() to get the number as float. From the variables in OP, it appears that there may be fractional numbers too, so, parseInt() may not work well in such cases(digits after decimal will be stripped off).
Use regex inside replace() to get rid of each appearance of ,.
var a = parseFloat('1,700.00'.replace(/,/g, ''));
var b = parseFloat('500.00'.replace(/,/g, ''));
var sum = a+b;
This should give you correct result even if your number is fractional like 1,700.55.
If I go by the title of your question, you need an integer. For this you can use parseInt(string, radix). It works without a radix but it is always a good idea to specify this because you never know how browsers may behave(for example, see comment #Royi Namir). This function will round off the string to nearest integer value.
var a = parseInt('1,700.00'.replace(/,/g, ''), 10); //radix 10 will return base10 value
var b = parseInt('500.00'.replace(/,/g, ''), 10);
var sum = a+b;
Note that a radix is not required in parseFloat(), it will always return a decimal/base10 value. Also, it will it will strip off any extra zeroes at the end after decimal point(ex: 17500.50 becomes 17500.5 and 17500.00 becomes 17500). If you need to get 2 decimal places always, append another function toFixed(decimal places).
var a = parseFloat('1,700.00'.replace(/,/g, ''));
var b = parseFloat('500.00'.replace(/,/g, ''));
var sum = (a+b).toFixed(2); //change argument in toFixed() as you need
// 2200.00
Another alternative to this was given by #EpiphanyMachine which will need you to multiply and then later divide every value by 100. This may become a problem if you want to change decimal places in future, you will have to change multiplication/division factor for every variable. With toFixed(), you just change the argument. But remember that toFixed() changes the number back to string unlike #EpiphanyMachine solution. So you will be your own judge.
try this :
parseFloat(a.replace(/,/g, ''));
it will work also on : 1,800,300.33
Example :
parseFloat('1,700,800.010'.replace(/,/g, '')) //1700800.01
Javascript doesn't understand that comma. Remove it like this:
a.replace(',', '')
Once you've gotten rid of the comma, the string should be parsed with no problem.
i am working with parseInt() as it only allow to pass value before decimcal place how i could pass the whole value i need to add the value in the textboxes .this below is code for the display of result after getting value from three different textbox using javascripting
function getText6(){
var in32=document.getElementById('in3').value;<value from textbox1>
var in332=document.getElementById('in33').value;<value from textbox2>
var in3332=document.getElementById('in333').value;<value from textbox3>
var in123=parseInt(in32)+parseInt(in332)+parseInt(in3332);
document.getElementById('in123').value=in123.toFixed(2);
}
now when in textbox in123 value come only take two digits before decimal plce.
like 34.56+138.00+964.80=1136.00 it take only 34+138+964=1136 i want that it take whole term and ans =1137.36
kindly help me for this result
Use parseFloat instead of parseInt. The latter strips away any decimal places since integers do not have them.
use parseFloat() instead of parseInt()
var in123=parseFloat(in32)+parseFloat(in332)+parseFloat(in3332);