Customcontrol validating user input in

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For more information on the upcoming change, we invite you to read our blog post.

There are many things that Angular helps us out with when creating forms.

First of all, it’s important to realise that we shouldn’t just create custom form controls right away, if there’s a native element (like ) that perfectly takes care of the job.

It seems native form elements are often underestimated in what they are capable of.

Then add a Custom Validator Control to the aspx page by going to the Tool Box then under that click Validation, select Custom Validator, then drag it to the page.

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property helps to check if the page is valid or not.In fact, if we try to bind any kind of form model to our custom control, we’ll get an error that there’s a missing ?Well, remember the things we talked about earlier that are needed to implement a custom form control?If the end user doesn't enter a phone number then it displays the first error.Secondly, if the user provides a phone number (for example 93493) that is invalid then it displays the second error message.We’ve covered several topics on Forms in Angular, like model-driven forms and template-driven forms.If you haven’t read those articles yet, we highly recommend you to do so as this one is based on them.One of the things we need to make sure is that changes are propagated from the model to the view/DOM, and also from the view, back to the model.This is what a model, as that’s the thing that is used in the view.For example, in the most simple scenario, we should be able to create a template-driven form like this: is, because that’s the thing that Angular uses to build a bridge between a form model and a DOM element.While our counter component works, there’s currently no way we can connect it to an outer form.

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