Validating user input in html
Each of these allies have their own perimeters which may or may not trust ours. As noted in the Introduction, we trust nothing and nobody.
The common phrase you will have seen in PHP is to never trust “user input”.
This article will explain some basics about form validation and then illustrate how to validate form fields using j Query.
There are two types of validation: client side validation and server side validation.
You can do and impressive amount of form validation with just HTML attributes.
You can make the user experience pretty clean and clear with CSS selectors.
Connected to this perimeter are separately guarded (and very suspicious looking) “allies” including the Model/Database and Filesystem.
Nobody wants to shoot them but if they press their luck..
All possible entrances and exits on the perimeter are guarded day and night by trigger happy sentries who prefer to shoot first and never ask questions.
By validating form responses before accepting them, we can alert users to their errors before they submit the form.
In this way, client side form validation can vastly improve the user experience.
With new features like this, (and the like), you can also client-side validate things like length (e.g.
minimum password length or maximum characters in bio textarea) and even go full-on regex. Say you wanted password requirements like stuff here, which makes this not work great in Firefox and IE. Feel free to pick and choose stuff from here that works for you.