In my first post of 2020 i would like to talk about “Power Apps component framework” (PCF).
I will not write another article about how to create your first PCF Control. There are some good article out there already covering this topic . For example: the Microsoft Docs, from Todd Baginski or the series of Articles regarding PCF from Allan De Castro (Episode 1 & Episode 4).
This article will focus on what i learned regarding CSS while creating my first PCF Controls (learn more about them).
Since it is my first post about PCF i thought it still might be a good idea to describe shortly what a PCF Control is.
Microsoft does describe the “Power Apps component framework” (PCF) as follows:
Power Apps component framework empowers professional developers and app makers to create code components for model-driven and canvas apps (experimental preview) to provide enhanced user experience for the users to work with data on forms, views, and dashboards.
Microsoft Docs (https://docs.microsoft.com/en-us/powerapps/developer/component-framework/overview)
CSS for Model-driven Apps (MDA)
Because of the structure of the CSS of model-driven Apps the Control will not automatically inherit the correct style. That means, that you have to style your Component manually. I will explain it on the example of a Control for a “Text.Singeline”-Field.
First of all we have to define the correct HTML structure. In the case of our example this will be rather easy.
The HTML Structure will be created in the “init”-function of your control.
I usually start by creating an own “container”-Div. There is already a “container”-Div passed to our init function. But i like to add my own, since i then can decide the CSS-classes and my CSS will not be affected if Microsoft changes something in the structure of this standard “container”-Div.
this._container = document.createElement("div");
Then i create the needed input and add the needed elements (like type, css-classes or event listner)
There are two ways of getting the same style as the standard.
You use the same CSS classes as the Model-driven App
You copy/resemble the CSS of the standard classes
Both have there pros and cons. I usually choose the second option. When we look at the CSS-class list of an element you will see that there are a lot of them:
On the image i don’t even show all classes of a standard Text.SingeLine field.
If we then look at the actual CSS behind those classes, we do see that every class has only one row if CSS.
For me that is very confusing. That is one reason why i copy the CSS. The other reason is that i like to be independent of changes Microsoft does. The reason for that is, that i might not be able to update my PCF Controls in time. With copying the CSS they still work after a change of Microsoft.
So if you decide on going for the second option as well i have already resembled the CSS that Microsoft uses for Inputs in Model-driven Apps, as of today.
If you copy the code below and change the first class to the namespace of your control it will look like a standard input.
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