get the textbox values

[Sophia Choi]

I use a for loop to create the textboxs like the following.
<input type="text" name="con_mark_<%=i%>" size="5" maxlength="3">
<input type="text" name="exam_mark_<%=i%>" size="5" maxlength="3">
But I meet a problem to retrieve their values in JavaScript.

var frm = document.forms[0];
var num_students = frm.num_students.value;

for(var i=0; i < num_students ; i++){
var con_mark = "con_mark_"+i;
var exam_mark = "exam_mark_"+i;
var attendance = "attendance_"+i;
alert(frm.con_mark_+i.value); --> null
}
How can I get their values ?
Thanks.

[David O'Meara]

Try using ev_al() such as:

ev_al("alert(frm.con_mark_"+i+".value);");

The String evaluates to the correct alert function, then gets executed by the JS engine.
Dave
(UBB doesn't like the word ev_al, so remove the underscore)

[Eric Pascarello]

this is wrong
alert(frm.con_mark_+i.value);
try this
alert(frm["con_mark_"+i].value);