For numeric fields, there is a convenient way to validate a value range, but we want to select to run a custom validation script.After the “Edit” button is clicked, a new window will open that allows us to edit the new script: This script also includes a check for an empty string, so that the user can wipe out a wrong string and start from scratch.Verimail keeps validating on keyup, which means, as soon as you start typing, you get an error message.Generally great plugin, but this one is a deal breaker - I would prefer to validate only when triggered manually, i.e.
Its only to help the user writing the correct address. Most times you just want to validate that the user entered the email in the right format. So I like this better than the original answer but a Septik's answer is comprehensive and I up-voted that as well.We will cover a few samples like validating e-mail address and URLs later. Here we will name it check_input and simply call this function whenever we need to validate simple input data: Note the check_input function at the bottom.What it does is takes the data passed to the function, strips unwanted characters (extra space, tab, newline) from the beginning and end of the data using the PHP trim() function, strips any quotes escaped with slashes and passes it through htmlspecialchars().As I mentioned before, information is passed to the validation function in the event object, and in the code we see that the member ‘value’ is used to communicate the current value of the field.The member ‘rc’ (or return code) is used to communicate back if the validation was successful or not.
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