Need to have textbox with input equal to 7 digits only - no more - no less (ASP.NET C#)
I have a textbox where it is required to have 7 digits inputs only. User cannot enter less than 7 digits and more than 7 digits.
I understand that in Textbox properties we can specify max characters, but how do we specify min characters for a textbox?
I understand that in Textbox properties we can specify max characters, but how do we specify min characters for a textbox?
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First, add a RequiredFieldValidator to validate the textbox to make sure it is not empty.
Then, add a RegularExpressionValidator
Then, add a RegularExpressionValidator
First of all set the MaxLength property of the TextBox to 7.
Then, if using the ajax control toolkit is an option, add a filtered textbox extender to it which will only allow users to enter digits into the textbox. (Example)
Then, for serverside validation, add a CustomValidator to it with the ValidateEmptyText property set to True and use the OnServerValidate event to handle the validation. You can validate via a int.TryParse and value.Length == 7 check if regular expressions are not your friend.
Then for client side validation check if http://www.livevalidation.com/ is an option for you. They have nice validators that indicate when input is satisfactory like coloring the textbox green and displaying a text when the input is acceptable.
Good Luck!