Category
Layout, Power Fx, delegation and the patterns that keep a canvas app maintainable at scale.
5 articles
The delegation warning looks like performance advice. It is not. A non-delegable filter evaluates the first 500 records and reports on those, so searches miss records that exist and totals are quietly wrong.
Rajiv Kumar·Jan 13, 2025·12 min read
Adding comments to a record in a canvas app is a common requirement and a good illustration of delegation, concurrency and refresh. The straightforward version is subtly wrong in three ways, all of which appear only once real data arrives.
Rajiv Kumar·Jan 3, 2024·5 min read
A form that will not save gives you almost nothing to work with — unless you surface Form.Error. Here are the seven usual causes in diagnostic order, from hidden required fields to person columns that need a record rather than a string.
Rajiv Kumar·Jan 13, 2022·5 min read
Canvas apps scale a fixed rectangle by default, which is why they look shrunken on phones. Real responsiveness means switching scaling off and building layout that computes itself from containers and break points.
Rajiv Kumar·Jan 5, 2021·5 min read
Power Fx is easy to write badly because it accepts procedural code. These are the patterns that hold up once an app has thirty screens and someone else has to change it: derive rather than store, handle errors where they happen, and give components real boundaries.
Rajiv Kumar·Jan 13, 2020·6 min read
