We can also use them to provide a more interesting enhancement – instant form validation.We have to be very careful here not to get carried away, creating overly aggressive validation that breaks the natural browsing behavior and gets in people’s way.You can check out a demo below: See the Pen Instant Form Validation by Site Point (@Site Point) on Code Pen.Once that scripting is implemented, we’re actually only a couple of skips and hops away from a complete polyfill.Email validation scheme tells that how to check if a user's email address is valid.Email validation checks the following points Figure 2: Above two figures are example of valid and invalid emails.Also, there's a large variety of j Query validation plugins that would helpful. For legacy browsers that don’t implement these attributes, we can use their values as the basis of a polyfill.
However, if you prefer a j Query solution you could try something like this.
In recent versions of Firefox, if a then the field will show a red outline, as illustrated by the following figure. If it did, then every required field would have that outline by default.
Instead, these outlines are only shown after you’ve interacted with the field, which is basically (though not precisely) analogous to the instant, as it could easily be triggered on and off many types in rapid succession while typing, creating a flashing effect which would be annoying or impossibly distracting for some users.
Add required field validators for every textbox and add a validation summary contol.
What we’re going to do in this article is far less intrusive.