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So basically you always default back and then only change the color on error.
-------- Just Andrei: solution doesnt work unless it finds a new error to highlight as a problem, then it will change the last problem back to white at the same time as it changes the new problem to yellow.
In my opinion one of the best new features is the way Angular 2 handles forms.
It doesn't seem to be getting a lot of attention and in this post I want to explain you how to implement the following: If we want to check something using a Promise (such as fetching data from the server) we can use an asynchronous validator.
To make it a bit neater why not just reset your controls to white up-front and then change the color when your checks fail?
Your validation seems very simple so you might want to look into using the built in ASP.
Add validation to your forms with this simple plugin.
The validation rules for standard HTML5 attributes are handled entirely by the browser using the HTML5 Constraint Validation API.
If you need to support these browsers, you must add a polyfill like Ryan Seddon's H5F.
Be careful that you aren't too restrictive though, which might lead to false negatives and a poor user experience.
For example, you'd be surprised at what kinds of email addresses are considered valid according to standards.
It works quite similar to the default Validator, only this time we want to return a promise.
This plugin adheres to the conventions set forth by Bootstrap's core j Query plugins, so be sure to check those out to get a better understanding of the goals and design of this plugin.