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 01-21-2013, 02:45 AM PM User | #1 GypsyParrot New to the CF scene   Join Date: Jan 2013 Posts: 2 Thanks: 0 Thanked 0 Times in 0 Posts calculate age from year of birth I have to create a javascript program that calculates age based soely on year of birth subtracted from the current year. I am having issues figuring out how to convert the current year into a variable so i can use it in my function for calculation. Can some one tell me what i am doing wrong. Here is the assignment and i have already completed all but the calculation for the age calculator: 1.**Volume** Of a Box:Allow the user to enter the width, length, and height of a box. When they hit a button that says "View Volume" it multiplies all 3 numbers together and shows the result in a disabled input box. - 50 points 2.Age: Allow the user to enter their year of birth. When they hit a button that says "Age This Year" it takes the current year and subtracts their year of birth. Display the result in a disabled input box. - 50 points Exercise 1

Please enter length and width below and I will give you the area.
Length
Width
Area:

Please enter your year of birth below and I will tell you your age.
Year of Birth:
Current Year:
Age:

 01-21-2013, 05:46 AM PM User | #2 Old Pedant Supreme Master coder!     Join Date: Feb 2009 Posts: 24,949 Thanks: 75 Thanked 4,307 Times in 4,274 Posts How much will you KICK yourself? Code: ```function calcualteAge() ... ``` By the by: It's not a great idea to use a function with the same name as some object's ID. It can make later debugging much more difficult, when the browser sees the ID and treats it as a JS name. __________________ An optimist sees the glass as half full. A pessimist sees the glass as half empty. A realist drinks it no matter how much there is.
 01-21-2013, 05:50 AM PM User | #3 Old Pedant Supreme Master coder!     Join Date: Feb 2009 Posts: 24,949 Thanks: 75 Thanked 4,307 Times in 4,274 Posts p.s.: If you will learn to use a JavaScript debugger, you will be able to find stuff like this yourself in a matter of seconds, minutes at most. You can use the JS debugger in any browser, but I personally feel that the one in CHROME browser is the easiest to learn and easiest to use. Just bring up your web page in Chrome and then hit the F12 key. And then click on the "Console" tab to see your errors. And then take the time to learn what you can do after you click on the "Source" tab. __________________ An optimist sees the glass as half full. A pessimist sees the glass as half empty. A realist drinks it no matter how much there is.
 01-21-2013, 08:23 AM PM User | #4 Airblader Regular Coder   Join Date: Jan 2013 Location: Germany Posts: 578 Thanks: 4 Thanked 77 Times in 77 Posts Also by the way: You cannot reliably calculate the age based on year information only. I was born 1990 – am I 22 or 23?
 01-21-2013, 08:24 AM PM User | #5 Philip M Supreme Master coder!     Join Date: Jun 2002 Location: London, England Posts: 17,477 Thanks: 200 Thanked 2,470 Times in 2,448 Posts document.writeln(today.getFullYear() ); document.writeln() is obsolete. document.write() statements must be run before the page finishes loading. Any document.write() statement that runs after the page finishes loading will create a new page and overwrite all of the content of the current page (including the Javascript which called it). So document.write() is at best really only useful to write the original content of your page. It cannot be used to update the content of your page after that page has loaded. You are already using the correct document.getElementById('agePlaceholder').value = age; Age: Surely you (and the assignment instructions) mean readonly? Be aware that HTML input elements such as textboxes within a form that have the disabled="disabled" attribute will not send their values to the server when the form is submitted. If you want to send the value to the server while still disabling the user from changing it you should make the textbox readonly. __________________ All the code given in this post has been tested and is intended to address the question asked. Unless stated otherwise it is not just a demonstration. Last edited by Philip M; 01-21-2013 at 08:56 AM..
 01-21-2013, 08:59 AM PM User | #6 felgall Master Coder     Join Date: Sep 2005 Location: Sydney, Australia Posts: 6,092 Thanks: 0 Thanked 579 Times in 569 Posts To correctly calculate someone's age using their date of birth (and validating that they entered it correctly in mm/dd/ccyy format) Code: ```Date.prototype.ageLastBirthday = function(dob) { var cy, by, db, adj; cy = this.getFullYear(); by = dob.getFullYear(); db = new Date(dob); db.setFullYear(cy); adj = (this-db<0) ? 1 : 0; return cy - by - adj; }; validateDate = function(y,m,d) { var dt; if (d !== +d || m !== +m || y !== +y) return false; dt = new Date(y, --m, d); if (d !== dt.getDate() || m !== dt.getMonth() || y !== dt.getFullYear()) return false; return dt; } var db = document.getElementById('dateOfBirth').value.split('/'); if (validateDate(d[2],d[0],d[1]) { var today = new Date(); var dob = new Date(d[2],--d[0],d[1]); document.getElementById('agePlaceholder').value = today.ageLastBirthday(dob); } else document.getElementById('agePlaceholder').value = 'Invalid date of birth entered';``` __________________ Stephen Learn Modern JavaScript - http://javascriptexample.net/ Helping others to solve their computer problem at http://www.felgall.com/ Beginners need to advise whether they want to learn "Latin" JavaScript for Netscape 3 or "Italian" JavaScript for modern browsers. Last edited by felgall; 01-21-2013 at 09:12 AM..

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