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BIRT: Weird behaviour of parseInt

I am using a report parameter in BIRT.
It a string, which contains the month/year, like: 08/2018
To test the value, I am using the following code. It is located in a Dynamic Text:
var dateStringArray = params["monthYear"].value.split("/");
var date = new Date(parseInt(dateStringArray[1]), parseInt(dateStringArray[0]) - 1, 1);
var t = parseInt(dateStringArray[0]);
t;
If I fill the parameter with 08/2018, I get a NaN, see:
But if I fill the parameter with 07/2018, it is working correctly:
I have tested it with several numbers. It is just not working with 08 and 09. All other number til 10 are working...

This seems to be a weird scenario. Need to raise a bug on this.
But for your workaround, you can make use of the code below in Dynamic Text which is working fine:
var dateStringArray = params["monthYear"].value.split("/");
var monNum;
if (BirtStr.charLength(dateStringArray[0]) == 2)
{monNum = BirtStr.right(dateStringArray[0],1);}
else {monNum = dateStringArray[0];}
monNum;
//var date = new Date(parseInt(dateStringArray[1]), parseInt(dateStringArray[0]) - 1, 1);
var t = parseInt(monNum);
t;

Subtract 1 from variable jQuery

Having some trouble getting this right. I'm very new to jQuery, so trying to get better and learn.
Currently I am getting 2 different values from a html table using the following code
var sellPrice = $('.qt').find("tr:eq(2)").find("td:eq(4)").html();
var buyPrice = $('.break .main-col .qt').find("tr:eq(2)").find("td:eq(4)").html();
These both output a value such as $13,000,000
I am then wanting to subtract 1 from these values (making it $12,999,999) before pasting them to an input as such
$('input[name="sell"]').val(sellPrice);
$('input[name="buy"]').val(buyPrice);
However, I am having some trouble with how to subtract $1 from these.
I tried using sellPrice--; but without success.
I've also tried adding - 1; at the end of each variable, but did not succeed either.
I tried to test something like this, but did not work either.
var minusOne = -1;
var getCurrentSellPrice = $('.qt').find("tr:eq(2)").find("td:eq(4)").html();
var getCurrentBuyPrice = $('.break .main-col .qt').find("tr:eq(2)").find("td:eq(4)").html();
var sellPrice = (getCurrentSellPrice - minusOne);
var buyPrice = (getCurrentBuyPrice - minusOne);
$('input[name="sell"]').val(sellPrice);
$('input[name="buy"]').val(buyPrice);`
Trying my best to familiarize myself with jQuery :)
Any help is much appreciated!

Solved using this
var getCurrentSellPrice = $('.qt').find("tr:eq(2)").find("td:eq(4)").html();
var getCurrentBuyPrice = $('.break .main-col .qt').find("tr:eq(2)").find("td:eq(4)").html();
var sellPrice = Number(getCurrentSellPrice.replace(/[^0-9\.]+/g,"")) - 1;
var buyPrice = Number(getCurrentBuyPrice.replace(/[^0-9\.]+/g,"")) + 1;
$('input[name="sell"]').val(sellPrice);
$('input[name="buy"]').val(buyPrice);

Since your numbers contain currency symbol and are strings, you need to convert them to proper numbers before subtracting them. See the answer below.
How to convert a currency string to a double with jQuery or Javascript?

Input field values not arithmetically summing up

Goodday, please i have a code to calculate the efficiency of a generator. The problem is the input fields all add up until the last variable. If all values were 2+2+3+4 which normally sums up into 11 normally, this program doesn't do that instead it just adds the 4 as in 2+2+3+4 equals 74.
That's the formula for calculating the efficiency of a generator.
$('.efmit').on('click', function efficiency() {
var vI = $('.I').val();
var vV = $('.V').val();
var ia = $('.ia').val();
var If = $('.If').val();
var Ra = $('.Ra').val();
var closs = $('.closs').val();
var vi_combo = vI*vV;
var ias = (ia*ia)*Ra;
var iv = If*vV;
var cent = 100;
var result = vi_combo+ias + iv;
var finalR = result + closs;
window.alert(finalR);
})

jQuery val method like $('.closs').val() returns String type variable not Number type.
You can cast type of variable to solve the problem.
var closs = Number($('.closs').val());

The reason is your program treated your variable as a string
try converting them to integer by parsing them like this parseInt(yourVariable).

Variable Returning NaN Value - Cannot find out why

I am having to pickup from where someone in the business left off many years ago with an aging texting system.
It was built using ASP classic and sends a string to an API that then texts out, all this is neither here nor there. The problem i have is no JS experience, I am am a SQL Developer and did a little bit of ASP Classic (VBScript) years ago.
This piece of JScript picks up information from several form boxes and then places them in a string which is then passed to variable on a processing page to text out. The fields 'QValue, Indemnity and Excess' are all numeric. The Cover is text and it is replacing the cover text with 'NaN' now I understand this is for 'Not A Number' well that is exactly what it is, not a number but I want the text string.
Here is the snippet of code in question:
<script type="text/javascript">
function changeMessageText()
{
var messagetxt = document.getElementById('message').value
var QValue = document.getElementById('QValue').value
var Cover = document.getElementById('Cover').value
var Excess = document.getElementById('Excess').value
var Indem = document.getElementById('Indemnity').value
var messagetxt=messagetxt.replace("[QValue]", + QValue)
var messagetxt=messagetxt.replace("[Cover]", + Cover2)
var messagetxt=messagetxt.replace("[Excess]", + Excess)
var messagetxt=messagetxt.replace("[Indem]", + Indem)
document.getElementById('messageText').innerHTML = messagetxt;
}
</script>
Cheers.

When you do string.replace(searchvalue,newvalue), there is no need of + before the newValue
var messagetxt=messagetxt.replace("[QValue]", QValue)
//cover or cover2 whichever appropriate
var messagetxt=messagetxt.replace("[Cover]", Cover)
var messagetxt=messagetxt.replace("[Excess]", Excess)
var messagetxt=messagetxt.replace("[Indem]", Indem)

Is it normal that you use Cover2 in the replace where you read the input value and store it in the Cover variable ?
Those are two different variables and from the code you provided, we can only assume that Cover2 is initialized with NaN (which might not be the case, it can be copy/paste error).

Here is how you do it:
var messagetxt = document.getElementById('message').value;
var QValue = document.getElementById('QValue').value
var Cover = document.getElementById('Cover').value
var messagetxt=messagetxt.replace("[QValue]", QValue)
var messagetxt=messagetxt.replace("[Cover]", Cover)
document.getElementById('messagetxt').innerHTML = messagetxt;
Here is a working example of this: http://jsfiddle.net/F24cr/
Enjoy

ExtJS 4.1.1: Evaluating a field in a grid

I'm struggling with a ExtJS 4.1.1 grid that has editable cells (CellEditing plugin).
A person should be able to type a mathematic formula into the cell and it should generate the result into the field's value. For example: If a user types (320*10)/4 the return should be 800. Or similar if the user types (320m*10cm)/4 the function should strip the non-mathematical characters from the formula and then calculate it.
I was looking to replace (or match) with a RegExp, but I cannot seem to get it to work. It keeps returning NaN and when I do console.log(e.value); it returns only the originalValue and not the value that I need.
I don't have much code to attach:
onGridValidateEdit : function(editor,e,opts) {
var str = e.value.toString();
console.log(str);
var strCalc = str.match(/0-9+-*\/()/g);
console.log(strCalc);
var numCalc = Number(eval(strCalc));
console.log(numCalc);
return numCalc;
},
Which returns: str=321 strCalc=null numCalc=0 when I type 321*2.
Any help appreciated,
GR.
Update:
Based on input by Paul Schroeder, I created this:
onGridValidateEdit : function(editor,e,opts) {
var str = e.record.get(e.field).toString();
var strCalc = str.replace(/[^0-9+*-/()]/g, "");
var numCalc = Number(eval(strCalc));
console.log(typeof numCalc);
console.log(numCalc);
return numCalc;
},
Which calculates the number, but I am unable to print it back to the grid itself. It shows up as "NaN" even though in console it shows typeof=number and value=800.
Final code:
Here's the final code that worked:
onGridValidateEdit : function(editor,e,opts) {
var fldName = e.field;
var str = e.record.get(fldName).toString();
var strCalc = str.replace(/[^0-9+*-/()]/g, "");
var numCalc = Number(eval(strCalc));
e.record.set(fldName,numCalc);
},

Lets break this code down.
onGridValidateEdit : function(editor,e,opts) {
var str = e.value.toString();
What listener is this code being used in? This is very important for us to know, here's how I set up my listeners in the plugin:
listeners: {
edit: function(editor, e){
var record = e.record;
var str = record.get("your data_index of the value");
}
}
Setting it up this way works for me, So lets move on to:
var strCalc = str.match(/0-9+-*\/()/g);
console.log(strCalc);
at which point strCalc=null, this is also correct. str.match returns null because your regex does not match anything in the string. What I think you want to do instead is this:
var strCalc = str.replace(/[^0-9+*-]/g, "");
console.log(strCalc);
This changes it to replace all characters in the string that aren't your equation operators and numbers. After that I think it should work for whole numbers. I think that you may actually want decimal numbers too, but I can't think of the regex for that off the top of my head (the . needs to be escaped somehow), but it should be simple enough to find in a google search.