Modal Prompts in JS

Jim Pistrang jim at jpcr.com
Thu Nov 21 22:28:37 EST 2019


Hi John,

Hmm, somehow I think you're answering a different question!  But thanks anyway!

Jim

>Hi Jim,
>
>Not sure if I understand your question totally. Here is what I think
>applies:
>
>We have these class objects that manage a record for a table, and, various
>connected records to that main record.
>When retrieving a "document" as we call it, we also load up the child
>records. This may result in many db requests to retrieve each of the child
>records for the main document.
>
>With a local connection to the db, this is irrelevant. However, when
>connecting to a remote db, the delay for each request is very significant.
>The same <1s process on a local db may take 10-15, 30 seconds on a remote db
>just retrieving the child records.
>
>For certain reports, where complete detail of an individual document is
>required, I tried this approach which seems to work pretty neat. I use a
>structure like this as a column calculation:
>
>    ( SELECT string_agg(concat(n.note_date, '\t', n.note_text), '\~'::text)
>AS note_list
>           FROM notes n
>          WHERE (n.doc_uid = doc.doc_uid)
>          GROUP BY n.doc_uid) AS notes,
>
>Where doc.doc_uid is the parent record key.
>
>What this select does is build a delimited list of columns/records from the
>notes linked to a document. So for each document, one column has a list of
>all its notes. We actually have several columns pulled back with other child
>lists of the document we're retrieving.
>
>When using joins, you'll get multiple records for the main record depending
>on the number of child records. With this approach, we get one record
>returned for each main record. All the child records for each record are in
>columns of the record. So only one db request to get everything.
>
>To retrieve the data from the column, we run the data through a parser that
>translates the delimited records into a list:
>
>Do $cinst.$getList(iNotesList,ivMainList.note_list)
>
>Where ivMainList.note_list is a child list of a main record retrieve with
>the sql above, and upon return, the iNotesList is populated with the data
>from ivMainList.note_list.
>
>A similar approach would be to use a json service, which would handle the
>data in pretty much in the same way except in a much a nicer format.
>
>Good luck.
>
>John Boehme
>Integral Consulting Services
>Bothell, WA
>940-597-3046
>
>-----Original Message-----
>From: omnisdev-en [mailto:omnisdev-en-bounces at lists.omnis-dev.com] On Behalf
>Of Jim Pistrang
>Sent: Thursday, November 21, 2019 10:21 AM
>To: Omnis List Mail
>Subject: Re: Modal Prompts in JS
>
>Hi all,
>
>Similar to Will, I am working on a strategy for presenting a prompt in the
>js environment.  My prompt will need to appear on multiple forms, and it is
>more complex than a simple OK or Yes/No message.
>
>My js forms all have a common superclass, so I was hoping to place a 'prompt
>box' on the superclass in the form of a paged pane that would be invisible
>by default but made visible to display a prompt.  This works, BUT the $order
>of the superclass paged pane is a lower number than the child form objects,
>so the paged pane appears behind other objects on the form.  Is there
>something I can do to get the paged pane in front of the other objects?
>
>Jim
>
>
>
>>
>>Hi All,
>>
>>I'm missing the Euromnis get-together this year, hope you're all doing 
>>well though.
>>
>>This is a question about prompts and the Omnis mechanism that runs the 
>>JS remote forms. We have about 3000 Yes/No messages in our app as well 
>>as a bunch or other prompts that require some form of user choice 
>>before continuing - they all run from a single task level object 
>>variable that builds and displays a suitable prompt then returns with 
>>the user selection. The problem is that this is often in the middle of 
>>a method i.e. halfway through processing an invoice, we might warn if 
>>the stock is going to drop below a level and ask if they want to 
>>continue... for example...
>>
>>In the current system this is modal, so Omnis execution pauses at that 
>>point in the method stack while we wait for a response. I had hoped to 
>>do something similar with JS forms so that we do not have to spilt and 
>>rewrite the majority of our core methods, however it does not appear to 
>>be that easy.
>>
>>I know that the browser on the client runs asynchronously to the Omnis 
>>server but was hoping I could work around it by issuing the client 
>>command to show a Yes/No prompt and then immediately entering a while 
>>loop while we wait for a user response, (in order to keep Omnis 
>>executing within our prompt method). When the browser responds with a 
>>result it would change the condition of the while loop and then we 
>>would then exit with the response. In this way the JS version works the 
>>same as the thick client and if there are multiple remote tasks they 
>>can time slice on the server and would still be responsive.
>>
>>But it does not work. The browser does not display the Yes/No prompt 
>>until the Omnis code stops executing on the server, which means we have 
>>to exit the method and then start a new stack after the user response, 
>>which means we need to rewrite any code that contains a Yes/No. Hmmm.
>>
>>The above process may not be the best way to structure code, but it 
>>would save us a hell of a lot of time. Is there are a way I can "flush"
>>the current method stack to force Omnis to update the client mid-stack?
>>Perhaps there is another way to simulate a modal response in the world 
>>of JS remote forms?
>>
>>Any thoughts? All Ideas welcome!
>>
>>Best regards
>>
>>Will
>>
>>
>>
>>[Lineal Software Solutions]        <http://www.lineal.co.uk>
>>
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>>
>>Will Adkin  / Software Development Manager 
>>will at lineal.co.uk<mailto:will at lineal.co.uk>
>>
>>Lineal Software Solutions
>>01271 375999
>>Commercial House, The StrandBarnstaple, Devon, EX31 1EU 
>>www.lineal.co.uk<http://www.lineal.co.uk>
>>
>>
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>
>--
>Jim Pistrang
>JP Computer Resources
>413-256-4569
><https://jpcr.com>
>
>
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-- 
Jim Pistrang
JP Computer Resources
413-256-4569
<https://jpcr.com>





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