Why am I receiving 'undefined' error when setting a variable?

[damicomj]

I am trying to compare a variable to what the variable previously was in the for loop. I run into a problem when I try to reset 'PAsubtotal'

The problem arises on the line:

PAsubtotal=0;

I get the error: "'undefined' is null or not an object"

 
var details = new Array();
    var cntr=0;
    var PAtemp = new String();
    var PAsubtotal;
 
    for( var current in me.items ){  
        var item = me.items[current];                 
        /*This is where I set matrix values*/        
PAsubtotal = PAsubtotal + item.price*item.quantity
 
        if (cntr > 0){
            if (!(item.size == PAtemp)){
                cntr++;
                details[cntr][5]= "<TD><b>" + PAsubtotal + "</b></TD></TR>";
                PAsubtotal=0;
            }
        }
 
        cntr++;
        PAtemp = item.size;
        } 
 

[Dormilich]

this error usually appears when an object method is called.

in your case it is probably on line 15. if details[cntr] is not defined (e.g. if cntr is the same as the array length) details[cntr][5] will throw this error.

[damicomj]

Sorry, I left some code out. Up above I have, /*This is where I set matrix values*/

This is the code I have in there:

 
        details[cntr]=new Array(5);
        details[cntr][0]= "<TR><TD>" + item.name + "</TD>";
        details[cntr][1]= "<TD>" + item.size + "</TD>";
        details[cntr][2]= "<TD>" + item.color + "</TD>";
        details[cntr][3]= "<TD>" + item.price + "</TD>";
        details[cntr][4]= "<TD>" + item.quantity + "</TD>";
        details[cntr][5]= "<TD>" + item.price*item.quantity + "</TD></TR>";
        PAsubtotal = PAsubtotal + item.price*item.quantity
 
        alert(details[cntr]);
 

[Dormilich]

the problem is still the same, if cntr reaches details.length, you try to access a not existing array object.

[damicomj]

I am a bit confused. I add one to cntr in the if statement, which should bring the matrix to the next line. I just this to fill in the other columns, but it didn't help. Can you provide a suggestion for me?

                details[cntr][0]= "<TR><TD> </TD>";
                details[cntr][1]= "<TD> </TD>";
                details[cntr][2]= "<TD> </TD>";
                details[cntr][3]= "<TD> </TD>";
                details[cntr][4]= "<TD> </TD>";
                details[cntr][5]= "<TD><b>" + PAsubtotal + "</b></TD></TR>";
                PAsubtotal=0;
 

[Dormilich]

no. you have a two-dimensional matrix, but your counter variable only increments the first level array.

[damicomj]

Okay, as an example, let's say cntr = 1.

The code in the If statement will get executed because cntr > 0. cntr++ will increment itself to 2.

details[2][5]= "<TD><b>" + PAsubtotal + "</b></TD></TR>"; 

is giving me the error. I don't see what is wrong with this line because I was using the same code outside of the If statement. Sorry if this is annoying, I am trying to talk myself through it.

[Dormilich]

what does details.length give you?

[damicomj]

Okay, I defined the array inside of the If statement like you said, and I think I am all set now.

details[cntr]=new Array(5);

thank you