Validating forms with

For a quick overview of what this plugin provides, check out this Webucator video (they also provide j Query trainings): If you use this plugin, you should support the ongoing development by donating to the campagin.The plugin is written and maintained by Jörn Zaefferer, a member of the j Query team, lead developer on the j Query UI team and maintainer of QUnit.The plugin comes bundled with a useful set of validation methods, including URL and email validation, while providing an API to write your own methods.All bundled methods come with default error messages in english and translations into 37 other languages.Obviously neither example is very limiting, but it will prevent people from entering completely wrong values, such as phone number, strings with multiple '@'s or spaces.Here is how it appears in Safari (with our CSS formatting to show the (in)valid state): In a similar fashion to the Again, the input box appears as normal: This time the minimum requirement for most browsers is one or more letters followed by a colon. :[\x01-\x08\x0b\x0c\x0e-\x1f\x21-\x5a\x53-\x7f] | \[\x01-\x09\x0b\x0c\x0e-\x7f]) ) \])\z Or you can look here for more solutions.It was started back in the early days of j Query in 2006, and updated and improved since then.The option of using pure HTML, sometimes with a touch of CSS, to complement Java Script form validation was until recently unthinkable.

There's no need to copy any images and, especially if your style-sheets are gzip-compressed, there will be next to no impact on load times. The main problem is that if the user doesn't enter a new value, the placeholder text will be submitted along with the form.

Using CSS you can place markers inside or alongside the input box, or simply use background colours and borders as some browsers do by default. On the i Phone/i Pad the different input types are associated with different keyboards, making it easier for people to complete your online forms.

In other web browsers they can be used in combination with the .

Again, not very helpful, but it will stop people trying to input their email address or other such nonsense. Careful examination of the RFCs associated with email addresses has been conducted repeatedly and has been proven to require the use of recursion in order properly determine the validity of an email address using the full set of RFC specifications.

As mentioned above, we can improve on this by making use of the are already implicit so the input has to match the entire expression. If anyone wants to contribute a more thorough expression to test for valid email or url format, feel free to post it using the Feedback option above.. Since it is not possible to recurse when using a regular expression it is also not possible to create a truly accurate regex for doing email address validation.

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For those you might want to place the valid/invalid markers alongside the element or format the input elements themselves using borders, background colours, etc. The "date" input AFAIK has only been implemented in Opera, but hopefully some day there will be cross-browser support for all the new types.

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