Subj : Javascript weirdness
To   : All
From : deon
Date : Sun Apr 17 2022 20:21:22

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

            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.)

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.

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":"<625A907B.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":1648166708,"when_written_zone":660,"when_imported_time":1650102395,"when_imported_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"}],"offset":26,"type":0,"version":768,"when_written_zone_offset":660,"when_imported_zone_offset":0,"thread_back":0,"data_length":869,"text_length":869,"upvotes":0,"downvotes":0,"total_votes":0,"is_utf8":0,"can_read":true}

Why does the update header error?


....лоеп

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