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21-Jan-2020 04:30

The option of using pure HTML, sometimes with a touch of CSS, to complement Java Script form validation was until recently unthinkable.

Sure there have been all kinds of whacky plug-ins over the years aimed at achieving this, but never a single standard that we could work towards.

For a more detailed introduction to HTML5 form validation you can find some great articles linked under References below.

In this article we intend to present only a number of simple examples to get you started, covering the basic form elements.

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assuming the PHP action name is "php4", you will then need to have an "Event switcher" action with the data provider set to , set the "Event list" to true,false (which are the anticipated results of the data provider) and click "Update events", now you can add the actions you need to the new events which will be triggered based on the result of the PHP function.

Input validation should happen as early as possible in the data flow, preferably as soon as the data is received from the external party.

Data from all potentially untrusted sources should be subject to input validation, including not only Internet-facing web clients but also backend feeds over extranets, from suppliers, partners, vendors or regulators[1], each of which may be compromised on their own and start sending malformed data.

Before you ask, and someone always does, these examples will currently work in the following browsers: Safari 5, Chrome 6, Opera 9, Firefox 4 Beta and the i Phone/i Pad.

Also each browser has a slightly different default behaviour.

assuming the PHP action name is "php4", you will then need to have an "Event switcher" action with the data provider set to , set the "Event list" to true,false (which are the anticipated results of the data provider) and click "Update events", now you can add the actions you need to the new events which will be triggered based on the result of the PHP function.

Input validation should happen as early as possible in the data flow, preferably as soon as the data is received from the external party.

Data from all potentially untrusted sources should be subject to input validation, including not only Internet-facing web clients but also backend feeds over extranets, from suppliers, partners, vendors or regulators[1], each of which may be compromised on their own and start sending malformed data.

Before you ask, and someone always does, these examples will currently work in the following browsers: Safari 5, Chrome 6, Opera 9, Firefox 4 Beta and the i Phone/i Pad.

Also each browser has a slightly different default behaviour.

Here is how the two inputs are displayed in Safari: and in Opera: They are currently not supported in Firefox 4 Beta. For example it is perfectly valid for an email address to go to the MX handler for a top level domain.