215321 - instanceof operator fails

Status: VERIFIED INVALID

(Core :: JavaScript Engine, defect)

Description

[Tony G]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.4) Gecko/20030624
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.4) Gecko/20030624

Running example code for manual located at
http://devedge.netscape.com/library/manuals/2000/javascript/1.4/guide/expr.html#1012225

theDay=new Date(1995, 12, 17)
if (theDay instanceof Date) {
   // statements to execute
}

produces the error:

Error: missing ) after condition
Source File: file:///T:/Downloads/expd/table_editor/xbtabledemo.html
Line: 26, Column: 11
Source Code:
if (theDay instanceof Date) { 

Reproducible: Always

Steps to Reproduce:
1.Place this script in a script tag:
theDay=new Date(1995, 12, 17)
if (theDay instanceof Date) {
   // statements to execute
}
2. Open html file in Mozilla 1.4 Gecko/20030624
3. Observe error in JavaScript Console

Actual Results:  
Error: missing ) after condition
Source File: file:///T:/Downloads/expd/table_editor/xbtabledemo.html
Line: 26, Column: 11
Source Code:
if (theDay instanceof Date) {

Expected Results:  
evalueated the expression in the if statement - to true.

Internal business applications are failing.

Comment 1

[Phil Schwartau]

Attachment: Testcase

Comment 2

[Phil Schwartau]

The testcase works fine for me, with no errors in the JS Console. 

Tony: could you try clicking on the testcase and see if it 
works for you, too? If not, see what happens if you download
the latest Mozilla build. I'm using rv 1.5b:

 Mozilla/5.0 (Windows; U; WinNT4.0; en-US; rv:1.5b) Gecko/20030806

I think either you had an old build with a bug in it, or there was
a typo in the testcase you actually ran. Let me know how the one
attached here works, thanks -

Comment 3

[Tony G]

I found the problem - the instanceof operator was being used in a script tag
with its language attribute set to "javascript1.2". The operator works fine when
the language attribute is either removed or set to "javascript1.3" or later

Comment 4

[Phil Schwartau]

Tony: thanks; marking Verified.