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Since it can sometimes be easier to put things into place by seeing each feature in use, here are a series of small examples that use each of the previous features.
Django’s form (and model) fields support use of simple utility functions and classes known as validators.
So now instead of typing the same code for each of our input fields we simply check each $_POST variable with the check_input function and that's it.
If you want to customize this process, there are various places to make changes, each one serving a different purpose.
To start using the new input types and attributes, you don't really need to do anything other than start using the new input types and attributes.
What it does is takes the data passed to the function, strips unwanted characters (extra space, tab, newline) from the beginning and end of the data using the PHP trim() function, strips any quotes escaped with slashes and passes it through htmlspecialchars().
A word of warning though: not all browsers implement the attribute accessibly, so it might not be picked up correctly in certain browser / screen reader combinations.
As such, current best practice recommends supplementing the required attribute with the aria-required=”true” attribute: Now that our users get prompted to complete required fields, we need to make sure that the data they submit is in the format we require.
Today I’m going to walk you through validating a simple booking form by using the Constraint API, and keep an eye on how you can make sure your forms stay accessible too.
To recap—or in case you haven’t read Sandeep’s article—with the dawn of HTML5, a raft of new input types and attributes were added to tags that allow the browsers themselves to perform the client-side validation for us: no Java Script required.