Validating when the user submits the form

Ian Oxley has been building stuff on the Web professionally since 2004.He lives and works in Newcastle-upon-Tyne, England, and often attends local user groups and meetups. When he's not in front of a computer Ian can be found playing guitar, and taking photos. Take this simple booking form: attribute for the label tag matches up with the id attribute of the associated input tag.This keeps our HTML semantic, with the labels helping to give meaning to the input controls.So if an older browser doesn't support them, the fact that they're in the HTML won't 'break' anything, they’ll just be rendered as an NB While client-side form validation is great for enhancing user experience—fast, instant feedback to the user without making a round trip to the server—you will still need to validate any data submitted on the server, too.

When used properly, these features make it significantly easier for users to provide the information needed, increasing completion rates, and improving accuracy.After making all these changes our HTML now looks like this: https://jsfiddle.net/ianoxley/9C2JD/ The good news is that HTML form validation is supported by all the latest desktop browsers, and most mobile browsers.The bad news is that it is only partially supported in Safari, and isn't supported at all on i OS Safari, or the default Android browser.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.We'll want the 'Name' field to be submitted in the format 'Firstname Lastname', and to only contain letters and a space (NB in real world scenarios, you might need to take account of other locales – this example has been kept simple deliberately).

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