Custom textbox validating user input in
Custom textbox validating user input in - ray j dating teairra mari
In that case, the previous value of the field is restored, and the user has to enter the data again.This is not always desired (for more complicated data, it will probably be much easier to take a look, correct that one typo and continue with the rest of the form), so my preference is actually to mark the field so that the user knows which field needs to be corrected, and have the validation script not report a validation error back to the field: Using this method has implications on the form submission process: The form no longer can verify that the data is correct, so the submission function needs to do another round of validation to see if any of the required fields are not correct (one way to do that is to test all relevant fields to see if the text color is using the error color, or we can use global variables to store the validation state).
This approach is ideal to the Custom Validator approach if you know that you are going to be using this validation on multiple pages or in more than one project.
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.
When collecting input from a user, it is important to ensure that the input received meets the requirements of the system.
For example, when placing an order at a site like it is vital that the user supply certain required bits of information, such as the shipping address and their payment information.
By creating a custom validation server control you can plop down the custom control on your page just like you would any other validation control.
You don't have to write any extra code or logic for your custom validation as it's all wrapped up in the custom control.
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.
Another thing I like to do is to display the validation error message on the form in an otherwise hidden field: The problem with our last solution is that if the user saves a partially filled form, and picks it up at a later time, that error message that popped up is long gone, and the only indication that there is something wrong with the form is the modified field color.
So, having a text field contain that error message might be a good idea.
The first project is a class library called "Reg Ex Controls" which contains a class called "Reg Ex Text Box"; this class is an extended text box control that provides the means to store a regular expression and to test the text box text against the regular expression.