Validating a web form in php
If you want to restrict the input of a text field to numbers without having the up/down arrows associated with the input box, you can always just set the input type to of "\d " (one or more numbers). So something along the line of [email protected] would be perfectly valid! Anyone out there know how to adjust the url validation so that it will accept inputs in the following format: no need to force a user to input or https:// You can find a comparison of some interesting regexes for validating URLs here.
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.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.The value, clicking 'down' with the input blank will result in a very large number. The examples posted in these responses are vastly oversimplified when compared against reality.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.The user should select an option other than this ‘Select One’ item.
The option of using pure HTML, sometimes with a touch of CSS, to complement Java Script form validation was until recently unthinkable.
In other words, in order to validate a field, you just associate a set of validation descriptors for each input field in the form. For such cases, a function is included which clears all validations in the validator object. Note that this validation if for fields like Textbox and multi-line text box.
For ‘selections’ like drop down and radio group, use an appropriate validation like ‘dontselect’ or ‘selone_radio’.
For these examples we have created our own valid/invalid CSS formatting to override the browser default. That's why you may see something like the following: Before you type anything into the box a red marker is shown.
As soon as a single character has been entered this changes to a green marker to indicate that the input is 'valid'.
Each field in the form can have zero one or more validations. More info & downloads where Do My Validation One() and Do My Validation Two() are custom functions for validation.