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This post will go over how to create a custom input component which supports validation and is compatible with both ng Model forms and Reactive Forms.

As an example we will create a custom textarea component, where the validation checks that the user input is a valid JSON string.

The validated result will be displayed outside of the form via binding, which will only update when the user input is valid.

You can go straight to the code right here: FXRk JWVZ9t Q9i6mxmuf?

is a fantastic user interface primarily library because the user’s view updates automatically when a state changes.

This ability to show changes to the user quickly also makes it a good fit for user-facing form errors.

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The last method we won’t really need as it handles touch events, but to satisfy the interface it can just be implemented with an empty block.

p=preview The steps below go over:operations for our control to write values to the native browser DOM.

A form component can optionally implement a Control Value Accessor, enabling it to read values and listen for changes. Angular comes with a standard provider for handling form controls called Default Value Accessor that works for Inputs, Checkboxes and standard browser elements, we need to add our own implementation for custom controls.

Right now, the button does nothing, besides posting back if the page is valid.

We will change this by adding an onclick event to it: As you will notice, we check whether or not the page is valid, before we do anything.

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