Creating validating processing html forms
There are two specific attributes that need to be set in the form tag, .This prevents the form from breaking if the user submits HTML markup and also is a means of protecting against XSS (Cross Site Scripting) attacks, which attackers will use to try to exploit vulnerabilities in web applications.Well known vulnerabilities such as Cross Site Scripting (XSS) and Cross-Site Request Forgery (CSRF) are filtered, as well as special control characters. Every multiple-choice, select box and similar are checked for forged values upon validating. We build tools to help you create, validate, and process HTML forms.To determine whether the form has been submitted by the user, either check the request method (an example follows in the next section) or check for the presence of a specific form control (usually the submit button).Whichever method you use, if the form has been submitted, it should be validated.
The script needs to be able to differentiate between the two stages so the form behaves properly.
You'll come across some cases where the native form widgets just don't provide what you need, e.g. In such cases, you may need to build your own form widget out of raw HTML.
This article explains how you'd do this and the considerations you need to be aware of when doing so, with a practical case study.
At this point you should find the Basic guides easy to understand, and also be able to make use of our Native form widgets guide.
The rest of the module however is a bit more advanced — it is easy to put form widgets on a page, but you can't actually do much with them without using some advanced form features, CSS, and Java Script.
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