Validating a textbox in javascript


22-Aug-2019 21:24

It assumes that all textareas on your form must be non-blank but you could easily change that if needed.This would apply an error css class to highlight your required fields and display an appropriate message to the user.Add required field validators for every textbox and add a validation summary contol.set validation group property for all validators, summary and button.However, if you prefer a j Query solution you could try something like this.var validate Text Areas = function() You would call this method during your form validation.The following code example uses the derived class Text Box and validates an email address that the user enters. Length) ' Set the Error Provider error with the text to display. Set Error(text Box1, error Msg) End If End Sub Private Sub text Box1_Validated(By Val sender As Object, _ By Val e As System. Validated ' If all conditions have been met, clear the error provider of errors. Set Error(text Box1, "") End Sub When you change the focus by using the keyboard (TAB, SHIFT TAB, and so on), by calling the Select or Select Next Control methods, or by setting the Container Control.

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Once you learn the art of using regular expressions you can use it with many computer languages.

So the condition is we check whether the textbox contains anything ELSE other than numbers and display a message As you can see the function validate() checks if the entered string contains characters that does NOT (notice the ^ symbol) match the numbers 0 to 9 including white spaces and special characters.



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