Ionic 4 - Guards and BehaviourSubjects to control access to your app

Ionic 4 can control access to pages and menu options by using Angular Guards and BehaviourSubjects. This adds to the client side user experience by simplifying navigation and providing a first line of defence against unauthorized access to pages on your site, or mobile app. Bear in mind though that Ionic 4 is using client side javascript which can ...Read more

Ionic 4 - Custom Async Validation against a JSON http server

Angular 7 custom async validators can be very useful for checking data against a backend server, such as a JSON http service. Async validators are only executed after synchronous validators are marked as valid, which helps to reduce unnecessary calls to the server. In addition, the call to the server can be timed to only happen after a specified ...Read more

A Clarion Template to Change Browse Colors

Clarion allows us to change the colors of browse lists and this can be a handy way of highlighting individual cells, or rows within an application. However it can be tedious to apply a set of colors across an entire application. So, I created a simple Clarion ABC template that sets the color of browse lists globally - GWBChangeBrowseRowColors The ...Read more

Clarion Metro Caption Template

In a previous post I discussed how we wanted to “modernize” the appearance of a simple Clarion application. We decided to use styling similar to that found in Norton Internet Security, namely a single MDI frame with a large toolbar and sub windows maximized within the main frame.

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Converting TPS files to SQL

Many people are still converting their Clarion for Windows applications from using the old Topspeed file format (.TPS) to various versions of SQL. We first undertook this process with a client in the year 2001! We had a lot on our plates back then with “Year 2000” concerns about the world coming to an end when all dates in the format dd/mm/yy ...Read more