Custom control not validating

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.I moved the functions to the parent aspx file (with the gridview in it) and now the functions are recognised OK.The snag no is that I don't know how to access the values I want to validate.I have no clue why Java Script isn't working in my ASCX, I had a look around on the Web and found a number of forum posts with a similar issue and the advice given was to move the code to the parent ASPX. So when we refer to “Form Groups”, this is what we’re talking about from here on out.That was partially wrong though: It is actually fairly easy to write custom validators that work seamlessly with both template-driven and reactive forms, which is what I’m going to show you in this post.I’m going to create a custom credit card number validator.

The error I get is: "Microsoft JScript runtime error: 'client Unit Price Validation' is undefined".

The validator is going to make sure that a credit card number has 16 digits and that it comes from an accepted credit card company.

In order to perform such validation, we have to implement a validator function that has the following signature: That’s the method signature used for both template-driven and reactive forms.

Hi, I'm using a Rad Grid with a popup form for editing and inserting records based on the excellent Edit Form types demo.

Everything I used from the demo works fine but I ran into a problem with validation.

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