Index to Articles

Published 2018-05-11 Last edit -

Hi All

I this article I detail some strategic issues that a new development UI will need to address - these are the ones that I can think of now - others may come to light during this journey.

See the webinar by Eduard Lebedyuk here from the last Global Summit describing modern web development and Caché

And, as always, if I have missed something please comment....

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2 1.4K
· Mar 18, 2018 1m read
Replacing ZEN - Index to articles

Hi All
This is the index to a series of articles I hope to create over the coming months.

ZEN and ZEN Mojo are no longer being actively developed by Intesystems - this is a great shame as it is a fine product that works so well for business applications.
However ZEN is a 15 year old product and I need a path forward to replace the ZEN UI with a supported development framework.

This article is an index of the other articles I have, or plan to write. - the articles will be subject to change as I develop my thoughts and climb the learning curve.

12 5
1 1.1K
· Dec 12, 2016 3m read
Generate and Validate Captcha Code

Suppose you have developed your own web app with InterSystems technologies stack and now want to perform a captcha validation on the client side in order to determine whether or not the user is human and make it safer. There are some modern frameworks to address the captcha issue, however most part of them needs internet access to generate codes and sometimes are complex to implement. Take this as basic example considering that image recognition has gotten too good. That's why you nowadays you tend to see more pattern recognition captchas than mere reading ones. (I.e.

7 9
2 1.4K
· Feb 14, 2017 1m read
Can you keep a secret?

If you are developing applications that use CSP or Zen, or potentially any of the other InterSystems web-related stuff that's built on top of CSP, then it's important to know how to keep one particular secret.

A central part of the CSP security architecture is a server-side session key. "Server-side" because its value should never be revealed to the client that is issuing the web requests. If it is revealed, a malicious client might be able to use it to bypass your security and make your server do things you don't want it to.

7 1
0 644
· Dec 12, 2019 2m read
Creating Portlets in DeepSee

What is a portlet?

The simple answer is: a custom widget. A portlet can exist by itself on a DeepSee dashboard, it can be used along side standard DeepSee widgets, or along side other portlets. The rendering of the custom widget is completely user defined. This means you can embed a web page, create a form to perform any sort of action needed based on the data on your dashboard, use third party charting libraries, or simply display data from outside of a DeepSee cube.

How to get started

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0 427

Creating information dashboards, pivot tables, and widgets is an important step in analysis that provides valuable sources of information for informed decision-making. The IRIS BI platform offers many opportunities to create and customize these elements. In this article, we will take a closer look at the basic techniques for developing them and the importance of using them.

6 1
0 290
· Jan 14, 2021
Page break - Zen Report

I have two tables in a row in my report, but if the first table gets too big to the point that tables 1 and 2 don't fit on the page, the page breaks.

The problem is that the page break is happening in the middle of table 2 and I wanted the page to break and leave table 2 on the second page.

No table grows to the point of occupying more than one page alone.

Any tips on how to guarantee this?

Remembering that the reports were made using Zen Report.

2 1
0 205

This code snippet provides a ZEN page that downloads a stream from its database directly:

/// We assume that you have stored your data within this schema:
/// MyApp.Model.Storage: Filename,FileSize,Content,ContentType
Class zen.downloadStream Extends (,%CSP.StreamServer)
    /// Wrapper to get the id of the download, we assume that the id is passed to this zen page
    /// as a URI parameter, i.e.: MyApp.Downloads.cls?OID=1234
    ClassMethod GetId()
        Quit $Get(%request.Data("OID",1))
    /// Set the appropriate header for the file.
    ClassMethod OnPreHTTP() As %Boolean
        Set tId = ..GetId()
        If ##Class(MyApp.Model.Storage).%ExistsId(tId) {
            Set tStream = ##Class(MyApp.Model.Storage).%OpenId(tId)
            // You could "guess" the content type by its file extension
            // or you can store it (before) in the database separately (like in this example).
            // Set Extension = $Piece(tStream.Filename,".",$Length(tStream.Filename,"."))
            // Set ContentType = ..FileClassify(Extension)
            Set %response.ContentType = tStream.ContentType
            Do %response.SetHeader("content-disposition","attachment; filename="_tStream.Filename)
            Do %response.SetHeader("Content-Length",tStream.FileSize)
        Else {
            Set %response.Status="404 File Not Found"
            Quit 0
        Quit $$$OK
    ClassMethod OnPage() As %Status
        Set Download = ##Class(MyApp.Model.Storage).%OpenId(..GetId())
        Do Download.Content.OutputToDevice()
        Quit $$$OK

Link to code on GitHub

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2 546


I have been experimenting with the creation of a set of REST services for an app. The basic GET operation is set to create a %ZEN.proxyObject instance, and then set an instance of a Persistant class as a property, which gives me all of the values I want to return. However, it also gives me some values that I don't want to return over REST (because they are both private, and large registered objects which will bog down performance)

2 3
0 433

I'm using FOP 1.1 for ZEN reports and would like to install fonts within the Windows/Fonts directory.

I added the xml tags in fop.xconf but so far I have been unable to get the correct font.

<renderer mime="application/pdf">

<!-- automatically detect operating system installed fonts -->



Any advice would be appreciated.

1 5
0 358

I want to limit the length of the value of a textarea in Zen. In HTML the textarea element has a 'maxlength' attribute, but the Zen component doesn't have an equivalent property. Is there any way to add a maximum length in Zen short of creating my own custom component?

1 3
0 637
· Oct 20, 2018
Looking for work

Hi every body

I hope it's the right place & I'm not offending any body.

I'm a veteran Mumps/Cache/Ensemble programmer . I think my only draw back is my age, although my brain is still young & bubbly.

I'm looking a long time for work without success.

I gathered a lot of knowledge & experience during those long years , developed many projects & i'm ready to do any work only to feel useful.

I'll add my resume, I hope & wish that this post will bring some change as I'm desperate to get some work.

1 0
0 378

I created a new class DSW.Addons.htmlViewer:

Class DSW.Addons.htmlViewer Extends %DeepSee.Component.Portlet.abstractPortlet

Property Data As %String;

ClassMethod %OnGetPortletSettings(Output pInfo As %List, ByRef pSettings) As %Status
    Kill pInfo
    Set pInfo(1) = $lb("Data", , , "Data", "Data setting")
    Quit $$$OK

It's a ZEN component and DeepSee portlet. It's immediately available in the namespace I created it in. DSW package is mapped to %ALL and to Samples, but if I try to create a widget with this portlet I get ZEN class not found error.

1 2
0 302

I have two pages and I am using the push and pop to go and back navigation. When I click the button forward and back in the browser, I can't navigate more between pages.

The following code:

Page 1 - onSelect Method:
var obj = {idExame: VALID, objUsu: ObjUsu};
zenPage.gotoArea ('itemexames', key, key, false);
view.pushDocument (key, obj, key, obj);

Page 2 - onSelectMethod, back:

var documentKey = "PacienteExamesinitial";
var layoutKey = "PacienteExamesinitial";
var area = "pacienteexames";

1 4
0 348

Hi everyone, I have and Zen Mojo application, it's all working but I have some doubts about what is recommended to use: There is some reports of employees, for example, and actually I'm using some plugins : "Excelent export" to generate Excel reports and "jspdf" to generate PDF reports in client side.

I have an REST service, that receives the request, process and returns JSON, after client side receive the response it's processed.

- This can be slow/bad in applications with large data?

- It's better/recommended to use ZenReports even with ZenMojo applications?

1 2
0 352


I need to set the label of a custom setting in the portal instead of the name of the associated property, eg.:

Class SomeClass Extends (Ens.BusinessService, %ZEN.Portal.ContextSearch)


Property ABadPropertyNameToChange As %Boolean;

Parameter SETTINGS = "ABadPropertyNameToChange:CustomSettingsSection"

will result in this in the portal



[ ]

1 3
1 237

I have a dataListBox in ZEN which has an OnDrawItem method associated with it. The DrawItem method never seems to be called and I cannot see why. I am using IE11. Can anyone suggest a reason? The attached code runs in a namespace called CODE and can be run using view webpage on the TheLabsApp.BioAnal class. Please note that the data is in a global called ^%ANAL that resides in %SYS.

1 3
0 233


Need some technique to solve an issue about zen page table.

- "xyz" table exists in all my namespaces.

I have a simple Zen page in "USER 1" namespace. It has a tablepane which pulls data from "xyz" table.

OnLoad of the page i want the zenpage to pull the data from "USER 2" namespace with same "xyz" table name.

Zenpage has to be in "USER 1" namespace

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2 298