Which validator should i use

These classes are thus:. You can know more about each of these classes here: angular form classes. If we add some bootstrap styling, the form, after being submitted without values, should look similar to this:. And that is it. You have learned how to implement validations in Angular reactive form using validators. Time to move on to conditional validation in Angular reactive forms — our next topic of the day. So far so good, our form has been validated, but, let's say, that is not the desired result we want.

Currently, the form is invalid until the user filled all the required fields. This means we have changes to make for user category as the user toggles between the two values employee or student. As can be seen, the user category is set to employee by default. We can then remove validation for the institution field. Our new setUserCategoryValidators will trigger the corresponding validation for institution, should the user choose student option for the user category, and vice versa. Putting everything together, when a user chose student as user category and clicked submit, the highlighted fields should now look like this:.

From the picture above, we can see that the salary and company fields are not highlighted, but the institution is highlighted with the other required fields. The salary and company fields are now optional. As shown above, also, when the user switched to employee , the salary and company fields become highlighted, while the institution field becomes optional and therefore not highlighted. If you would like to see the full source code, visit the Github repo.

I would love to hear your corrections, suggestions or feedback in the comment section. Thanks for your time!

Great article! I have one question. How to show asterisk in the template only when control contains Validators. My goal is to only base on Validator list and not on some custom made flags in the code. Mobile App Development. Programming Languages. Get insights on scaling, management, and product development for founders and engineering managers. Read programming tutorials, share your knowledge, and become better developers together.

Hot Topics. Jimoh Hadi Follow. I have Bsc. Published Nov 22, Last updated May 20, Having a standards-compliant code is the best practice for web design. It also teaches and encourages best practices for web design. While many veterans have learned to create error-free code and make relatively few validation errors, most beginners make more errors. W3C validated websites will be easily accessed by people with modern browsers.

Validation improves usability and functionality because your users are less likely to run into errors when displayed on browsers compared to non-validated websites. Validation is fully compatible with a wide range of dynamic pages, scripting, active content, and multimedia presentations. The website validation process allows website designers to correct formatting errors that impact website performance, and following international standards, the code used in websites is reduced in size while improving efficiency.

Because of this, web pages are displayed much faster and flow much better compared to websites that have not been validated. Making website browsers friendly is one of the biggest reasons why W3C code validation was introduced.

Websites that are not validated may display correctly in one browser but not in other browsers. Many websites face cross-browser problems. Websites that are not validated may display formatting problems when used in certain browsers. On the other hand, W3C validated websites are displayed without errors regardless of what browser is used.

There are five major web browsers: Google Chrome, Firefox, Microsoft Edge, and Safari, and usage among them translates to millions of internet users. With the recent boom in smartphones and tablets, more people will be accessing the Internet from mobile devices than desktop computers. Unfortunately, many website owners do not take advantage of this growth and forego W3C validation that makes sure their websites and web pages are mobile-friendly too.

If you want your website to be visited by as many users as possible, accessibility should be a big factor. Websites or web pages that validate using W3C website validation have code formatted efficiently and are easy to edit, and it helps website owners to create a new page or another new website with similar formatting.

Validators tell you where you have errors in your code. If your page isn't displaying as expected, a validator might very well point you to the cause of the display problems.

Also, an invalid code that may display fine in one document may show stopping errors in another because of the encompassing code.

I was wondering what is the correct way of implementing the custom Validator in JSF 1. In my Validator class'. This seems to be working fine in my application. Or would JSF be smart enough to look at the error messages in context to manage the lifecycle?

You should indeed be throwing a ValidatorException. Otherwise JSF will still continue processing the request and update the model values and invoke the action method. You don't want to have it. Do not manually add the FacesMessage. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more.

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