What steps should I take to enable users of my library to customize component templates as needed?

I created a customized component to enhance the appearance of bootstrap form controls, intended for use in various projects. I am considering transforming this into a library (a separate npm package with its own @NgModule), but some projects may wish to modify the template. How can I make this process more user-friendly for them?

Initially, I tried extending the component class and using a different template within the @Component decorator, resulting in the following error:

[ERROR ->]<form-control labelKey="Issue.StoryPoints" helpKey="Effort estimate by the development team">
  <in"): ng:///AppModule/EditIssueComponent.html@34:2
More than one component matched on this element.
Make sure that only one component's selector can match a given element.
Conflicting components: FormControlComponent,MyFormControlComponent ("
</form-control>

While I could change the selector, doing so after the fact would require updating all instances across templates. Specifying a unique selector from the start is reminiscent of YAGNI...

Am I overlooking a better approach?

It seems counterintuitive for a framework that easily allows provider overrides to lack support for component overriding :-(

angulartypescript

Answer №1

It is important for your components to function like self-contained entities or 'black-boxes'. They should have defined inputs, outputs, and possibly some public methods. Allowing users to directly modify the template of your component would require them to possess intricate knowledge of its internal structure. However, there are certain ways in which users can customize the behavior or structure of your component:

If you wish to enable users to insert additional HTML or templates at specific locations, you can utilize the ng-content tag within your component's template.

To allow users to alter specific functionalities of the public API of your component, you can use the extend method without an @Component decorator.

If users want to create their own custom components based on yours, they can either wrap your component with another layer or extend it by creating their own @Component with a unique prefix selector.

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