I have a lill problem in JavaScript...
I saw this source code for a GPA calculator...
but it's not working properly, need help fixing
it
<CENTER>
<FORM Name="GPACalcForm">
<TABLE BORDER=5 BGCOLOR= #C0C0C0
CELLPADDING="5"
CELLSPACING="2">
<TH></TH>
<TH>Grade</TH>
<TH>Credits</TH>
<TR>
<TD>Class 1</TD>
<TD><INPUT TYPE=TEXT SIZE=5
NAME="GR1" ALIGN=TOP
MAXLENGTH=5></TD>
<TD><INPUT TYPE=TEXT SIZE=5
NAME="CR1" ALIGN=TOP
MAXLENGTH=5></TD>
</TR>
<TR>
<TD>Class 2</TD>
<TD><INPUT TYPE=TEXT SIZE=5
NAME="GR2" ALIGN=TOP
MAXLENGTH=5></TD>
<TD><INPUT TYPE=TEXT SIZE=5
NAME="CR2" ALIGN=TOP
MAXLENGTH=5></TD>
</TR>
<TR>
<TD>Class 3</TD>
<TD><INPUT TYPE=TEXT SIZE=5
NAME="GR3" ALIGN=TOP
MAXLENGTH=5></TD>
<TD><INPUT TYPE=TEXT SIZE=5
NAME="CR3" ALIGN=TOP
MAXLENGTH=5></TD>
</TR>
<TR>
<TD>Class 4</TD>
<TD><INPUT TYPE=TEXT SIZE=5
NAME="GR4" ALIGN=TOP
MAXLENGTH=5></TD>
<TD><INPUT TYPE=TEXT SIZE=5
NAME="CR4" ALIGN=TOP
MAXLENGTH=5></TD>
</TR>
<TR>
<TD>Class 5</TD>
<TD><INPUT TYPE=TEXT SIZE=5
NAME="GR5" ALIGN=TOP
MAXLENGTH=5></TD>
<TD><INPUT TYPE=TEXT SIZE=5
NAME="CR5" ALIGN=TOP
MAXLENGTH=5></TD>
</TR>
<TR>
<TD>Class 6</TD>
<TD><INPUT TYPE=TEXT SIZE=5
NAME="GR6" ALIGN=TOP
MAXLENGTH=5></TD>
<TD><INPUT TYPE=TEXT SIZE=5
NAME="CR6" ALIGN=TOP
MAXLENGTH=5></TD>
</TR>
<TR>
<TD>Class 7</TD>
<TD><INPUT TYPE=TEXT SIZE=5
NAME="GR7" ALIGN=TOP
MAXLENGTH=5></TD>
<TD><INPUT TYPE=TEXT SIZE=5
NAME="CR7" ALIGN=TOP
MAXLENGTH=5></TD>
</TR>
<TR>
<TD>Class 8</TD>
<TD><INPUT TYPE=TEXT SIZE=5
NAME="GR8" ALIGN=TOP
MAXLENGTH=5></TD>
<TD><INPUT TYPE=TEXT SIZE=5
NAME="CR8" ALIGN=TOP
MAXLENGTH=5></TD>
</TR>
<TR ALIGN=CENTER>
<TD COLSPAN=3><INPUT TYPE="BUTTON"
VALUE="Calculate"
NAME="CalcButton"
OnClick="gpacalc()"></TD>
</TR>
</TABLE>
</FORM>
<BR>
<P>
<P>
</CENTER>
<BR>
<SCRIPT LANGUAGE="JavaScript">
<!--
function gpacalc()
{
//define valid grades and their values
var gr = new Array(9);
var cr = new Array(9);
var ingr = new Array(5);
var incr = new Array(5);
// define valid grades and their values
var grcount = 11;
gr[0] = "A+";
cr[0] = 5;
gr[1] = "A";
cr[1] = 4;
gr[2] = "A-";
cr[2] = 3.66;
gr[3] = "B+";
cr[3] = 3.33;
gr[4] = "B";
cr[4] = 3;
gr[5] = "B-";
cr[5] = 2.66;
gr[6] = "C+";
cr[6] = 2.33;
gr[7] = "C";
cr[7] = 2;
gr[8] = "C-";
cr[8] = 1.66;
gr[9] = "";
cr[9] = 1;
gr[10] = "F";
cr[10] = 0;
// retrieve user input
ingr[0] = document.GPACalcForm.GR1.value;
ingr[1] = document.GPACalcForm.GR2.value;
ingr[2] = document.GPACalcForm.GR3.value;
ingr[3] = document.GPACalcForm.GR4.value;
ingr[4] = document.GPACalcForm.GR5.value;
ingr[5] = document.GPACalcForm.GR6.value;
ingr[6] = document.GPACalcForm.GR7.value;
ingr[7] = document.GPACalcForm.GR8.value;
incr[0] = document.GPACalcForm.CR1.value;
incr[1] = document.GPACalcForm.CR2.value;
incr[2] = document.GPACalcForm.CR3.value;
incr[3] = document.GPACalcForm.CR4.value;
incr[4] = document.GPACalcForm.CR5.value;
incr[5] = document.GPACalcForm.CR6.value;
ingr[6] = document.GPACalcForm.GR7.value;
ingr[7] = document.GPACalcForm.GR8.value;
// Calculate GPA
var allgr =0;
var allcr = 0;
var gpa = 0;
for (var x = 0; x < 5 + 3; x++)
{
if (ingr[x] == "" break;
// if (isNaN(parseInt(incr[x]))) alert("Error-
You did not enter a numeric credits value for
Class If the class is worth 0 credits then enter
the number 0 in the field.";
var validgrcheck = 0;
for (var x = 0; x < grcount; x++)
{
if (ingr[x] == gr[x])
{
allgr = allgr + (parseInt(incr[x],10) * cr[x]);
allcr = allcr + parseInt(incr[x],10);
validgrcheck = 1;
break;
}
}
if (validgrcheck == 0)
{
alert("Error- Could not recognize the grade
entered for Class " + eval(x + 1) + ". Please
use standard college grades in the form of A
A- B+ ...F.";
return 0;
}
}
// this if-check prevents a divide by zero error
if (allcr == 0)
{
alert("Error- You did not enter any credit
values! GPA = N/A";
return 0;
}
gpa = allgr / allcr;
alert("GPA = " + eval(gpa));
return 0;
}
//-->
</SCRIPT>

A source code that is not yours and doesn't have proper commenting how will you understand it lol

To be able to modify a source code, you'll have to understand the language in its entirety. Modifying usually is a short cut and will not improve your skills. Anyways I hope someone good in Javascript can help you

try to solve the problem yourself. sweat. If it's an assignment work your way through it first,
dont look for easy way out.


ps. I think you are lazy and just want to sponge off other people.
Use ur brain.

asalimpo:
try to solve the problem yourself. sweat. If it's an assignment work your way through it first,
dont look for easy way out.


ps. I think you are lazy and just want to sponge off other people.
Use ur brain.

Lol..... well you are damn right, am very lazy.
are you a programmer?

Mehn see code.... my eyes are hurting

At what point in all this do you have errors? Does your function get called at all?
Try using chrome, open developer console and read the errors there.

Also print to the console so that you know where in your code lies the error.

I'm unable to help, cos you didn't state point of failure or any useful information