the field should have a red background and some text displayed.Any idea's how this can be done using CSS or similar methods?
You can write Java Script scripts to check the following validations.You might have been looking for ways to tackle this problem by searching for different off the shelf solutions, but more often than not I guess a lot of reimplementing the same old is the norm in actual code.If this is the case, this post will be about exploring alternative approaches for handling form validation, where the ideal outcome should be write once and use almost everywhere.To get a string contains only numbers (0-9) we use a regular expression (/^[0-9] $/) which allows only numbers.Next, the match() method of the string object is used to match the said regular expression against the input value. To get a string contains only numbers (0-9) with a optional or - sign (e.g.Sometimes we can solve a recurring task with a straight forward implementation, which we will try to define in this following write up.
Let’s begin with the first approach that comes to mind, defining validation functions for every possible case that needs to be validated.
Form handling sounds trivial sometimes, but let’s just take a second to think about what is involved in the process.
We need to define form fields, we need to validate the fields, we also might need to display errors according to fact if the input validates, furthermore we need to figure out if the validation is instant or only after clicking on a submit button and so on and so forth.
The following form contains some typical validators needed in a registration form.
This j Query plugin has support for a lot more validation functions, you find them all in the menu to the right.
If the string value is numeric, it will return true, otherwise it will return false.