Subj : Javascript weirdness
To   : deon
From : Digital Man
Date : Sun Apr 17 2022 17:02:10

  Re: Javascript weirdness
  By: deon to All on Sun Apr 17 2022 08:21 pm

 > Howdy,
 >
 > Hoping somebody could help me understand something unusual that's happening
 > wth Javascript. I think it's a bug, but who knows somebody might see the err
 > of my ways.
 >
 > I have created an object "MsgArea" which represents a message area and the
 > ability to get a list of "tagged" messages and "untagged" messages.
 >
 > Here is the relevant part of the object:
 >
 > ====
 > function MsgArea() {
 >     this.msgbase = undefined;
 >     this.headers = undefined;
 >     this.tagged_list = undefined;
 >     this.untagged_list = undefined;
 >
 >     const PAGE_LENGTH = 4;            // The size of our page tag.
 >     const PAGE_LAST_KEY = 'last_page';
 >
 >     Object.defineProperty(this,'code',{
 >         set: function(code) {
 >             this.msgbase = new MsgBase(code);
 >
 >             if (! this.msgbase.open('r')) {

What significance is this 'r'? I don't think that'll have any effect.

 >                 writeln(ma.areas[i].code+' cannot be opened?');

'ma' and 'i' don't appear to be defined in this scope. I don't this error handler is going to execute as intended.

 >                 exit(2);
 >             }
 >
 >             this.headers = this.msgbase.get_all_msg_headers(false,false);
 >             this.msgbase.close();
 >         }
 >     });
 >
 >     // Total tagged messages
 >     Object.defineProperty(this,'list_tagged',{
 >         get: function() {
 >             if (this.tagged_list === undefined) {
 >                 this.tagged_list = [];
 >
 >                 if (! this.headers)
 >                     return this.tagged_list;
 >
 >                 for(var x in this.headers) {
 >                     if (this.headers[x].tags && (this.headers[x].tags.length
 > === PAGE_LENGTH)) {
 >                         this.tagged_list.push(this.headers[x]);
 >                         write(); // Needed else this is not working?

That's pretty strange.

 >                     }
 >                 }
 >             }
 >
 >             return this.tagged_list;
 >         }
 >     });
 > ====
 >
 > I'm seeing two problems:
 >
 > 1)
 >
 > If I use:
 > var x = new MsgArea();
 > x.code = 'PVT_TEST';
 > writeln('Tagged Messages: '+x.list_tagged.length);
 >
 > It reports 36 (which is correct). If I comment out the "write()" in the
 > function list_tagged, it reports 25. Why? (And I have confirmed that 23 of
 > the 25 do have a "tags" header.)

Woudn't 23 be the right answer then?

 >
 > 2)
 >
 > The other 2 messages of the 25 I cannot set a "tags" value in the header -
 > the function put_msg_header() returns an error, but no details.

If put_msg_header() returns false, the details will be contained in MsgBase.error and MsgBase.status. Check/log those property values upon error.

 > Here is one of those message headers (in which I set the tags header to
 > "1829"):
 >
 > {"number":27,"tags":"1829","to":"Clearing Houz","subject":"Address Link
 > Code","from":"Hub
 > Robot","from_net_type":2,"from_net_addr":"10:1/1","id":"<625A
 > 907B.27.pvt_test@mybbs.com>","ftn_area":"PVT_TEST","date":"Fri, 25 Mar 2022
 > 11:05:08
 > +1100","attr":0,"votes":0,"auxattr":0,"netattr":0,"when_written_time": 16481
 > 66708,"when_written_zone":660,"when_imported_time":1650102395,"when_import e
 > d_zone":0,"thread_id":27,"thread_next":0,"thread_first":0,"delivery_attempts
 > ": 0,"field_list":[{"type":160,"data":"RESCANNED
 > 10:1/1@private"},{"type":162,"data":"1/1
 > 998"},{"type":163,"data":"1/1"}],"offs et":26,"type":0,"version":768,"when_w
 > ritten_zone_offset":660,"when_imported_zon e_offset":0,"thread_back":0,"data
 > _length":869,"text_length":869,"upvotes":0,"do
 > wnvotes":0,"total_votes":0,"is_utf8":0,"can_read":true}
 >
 > Why does the update header error?

The error/status MsgBase property values will tell you why.
-- 
                                            digital man (rob)

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