using eval()

[matt.carter.25]

Can anyone help me out,
Im using eval() which works fine in this example

tempObj = eval("document.subGroup.DeleteSG" + CategoryArr[i] + ".checked");

but when i use this

tempObj = eval("document.subGroup." + SubGroupArr[i] + ".value");

i get an error saying ';' expected
Its really doing my head in!!!!

Cheers if anyone has nay ideas
Matt

[javaNoobie]

We'll have to see more codes.

[matt.carter.25]

Its ok i found the problem,
One array element was 'No Category'
so i think the Space was causing the problem

Thanks anyway
Matt

[Charles]

tempObj = eval("document.subGroup.DeleteSG" + CategoryArr[i] + ".checked") is better written as tempObj = document.subGroup.DeleteSG[CategoryArr[i]].checked. The "eval()" function is almost always unnecessary.

[matt.carter.25]

Not sure what your talking about because that doesnt work!!!

You cant insert a javascript variable in that sort of statement,
Which is why you use the eval() method.

eval() is a very useful method!
matt

[senshi]

Originally posted by matt.carter.25
Can anyone help me out,
Im using eval() which works fine in this example

tempObj = eval("document.subGroup.DeleteSG" + CategoryArr[i] + ".checked");

but when i use this

tempObj = eval("document.subGroup." + SubGroupArr[i] + ".value");

i get an error saying ';' expected
Its really doing my head in!!!!

Cheers if anyone has nay ideas
Matt

eval(); evaluates a string that is a javascript command....

eval("tempObj = document.subGroup." + SubGroupArr[i] + ".value;");

IS more likely the thing your looking to do, if SubGroupArr[i]==element then the eval would pass the string

tempObj = document.subGroup.element.value;

and work on it as if it was part of your code.

eval(); wont return a value like in functions.

[matt.carter.25]

Well Sorry to say this but i think you are wrong,

tempObj = eval("document.subGroup.txt" + CategoryArr[i]);
does in fact return a value.

i can now use tempOgj.value!!!!!

plus if you had read all the other replies you would realise that the orginal problem was because i had an element in the array which has a space in it. which is why i had the problem!!!!!

Thanks anyway
Matt

[Charles]

Originally posted by matt.carter.25
Not sure what your talking about because that doesnt work!!!

You cant insert a javascript variable in that sort of statement,
Which is why you use the eval() method.

eval() is a very useful method!
matt JavaScript has a lot of redundancy in its syntax and all Objects can be referenced as associative arrarys. "eval()" requires the browser to loop back through the parser.

[7stud]

is better written as:
tempObj = document.subGroup.DeleteSG[CategoryArr[k]].checked.

Not sure what your talking about because that doesnt work!!!
You cant insert a javascript variable in that sort of statement,

Why not? :confused:

In most cases(all?), javascript provides a means to access elements either by their id/name string or by their numeric position in a collection.