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Configuring AJAX TextboxWatermark Control

How to Use the ASP.Net AJAX FilteredTextBox Extender


Introduction to FilteredTextBox Extender


The FilteredTextBox Ajax Extender control is a part of the Microsoft Ajax Toolkit for ASP.Net. The Ajax toolkit is a free, open source Ajax library that can be used in any ASP.Net project to add rich Ajax functionality to websites. The Ajax Toolkit can be downloaded free from the Microsoft ASP.Net website.


The FilteredTextBox Extender is a control extender. This means that it extends the behavior of an existing ASP.Net control. In this particular case, the control that is extended is the ASP.Net TextBox. The ASP.Net Textbox does not have any Ajax functionality by itself. The FilteredTextBox extender adds Ajax functionality to the textbox by injecting Javascript in the client side.


Adding FilteredTextBox to Your WebPage


To implement the FIlteredTextBox in your projects add a reference to the MS Ajax Toolkit DLL. Now all the controls of the ASP.Net Ajax Toolkit will be available in the toolbar. If you are using Visual Studio 2005, you can drop the FilteredTextBox control extender in your Source View, and set the ExtendedControl property to the name of the textbox you want to extend.



If you are using Visual Studio 2008, you don’t have to worry about setting the property. Instead just click on the TextBox control you want to extend; you will see a arrow at the rightmost edge. Clicking on the arrow will bring a Context menu with the command ‘Add Extender’. Clicking on Add Extender will bring a list of Extenders valid for the control. Just click on the FilteredTextBox extender and it will be added to your Source with all the properties correctly set for the TextBox control.


 Now your extender control is on the page, and we can modify its behavior.


Working with the FilteredTextBox


You can use the FilteredTextBox extender to stop the user from entering garbage input. You can limit the input in the TextBox to specific characters. If the user will try to type anything else, nothing will appear.


This is great to user-proof form Textboxes. For example, if a TextBox is supposed to accept phone numbers only, this control can make it easier for the user to enter a correct phone number buy accepting only relevant keypresses like numbers, ‘-‘, etc.


Examining the FilterType


The FilterType property is the most basic property of the extender. It is an enumeration property with three options: -


1.  LowercaseLetters – The TextBox will accept only lowercase alpahabets, and translate all uppercase input automatically to lowercase.

2. Numbers – The TextBox will accept only numeric input.

3. UppercaseLetters – The TextBox will accept all input only in the Uppercase.


Using these three properties is quite simple, but the in the practical world you will need to work with other kinds of inputs too.  For everything apart from these 3, there is the Custom FilterType.


When you set your FilterType to Custom, you will be able to define more freely what are the characters that you plan to allow, or disallow the user from entering. You can do that by setting the ValidChars or the InvalidChars property of the FilteredTextBox Extender.


Let’s see some code which implements a FilteredTextBox Extender setup to accept a valid email address.



Notic that we have set the FilterType to Custom, FilterMode to FilterMode to ValidChars and the ValidChars property to a long string containing all the characters that are allowed in an email address (all alphabets, numbers and the ‘@.’ symbols.)


When you set the FilterType to Custom you will also have to set the FilterMode and the ValidChars or InvalidChars property. The FilterMode property decides whether you want to set the filter to allow characters or ban characters. You cannot do both.


If you want to allow specific characters and ban the rest, set the FilterMode to ValidChars. If you want to ban some characters and allow the rest, set the FilterMode to InvalidChars.


Depending on what you set the FilterMode to, you will also need to set one of the ValidChars and InvalidChars properties. In the example above we have set ValidChars to all the characters that are allowed in an email address. If the user tries to enter any other character than those in the ValidChars, his input will be rejected. For example, the box will not accept ‘<’, or ‘*’ which are symbols used often in SQL or Javascript injection attacks.


If you do the opposite, i.e. set the value of InvalidChars property and set the FilterMode to ‘InvalidChars’, the TextBox will accept all input except the characters specified in the InvalidChars. You can use this to ban some special characters or letters if you are asking the user to enter a code, etc.


Working in Code


You can also modify the behavior of the FilteredTextBox Extender in code. This can be useful if you want to limit the user input based on a database value, or some value that has been set in your ASP.Net application. Or you can use some logic to bind the Extender to different TextBoxes. Let’s see a small example: -



In this example I have a FilteredTextBox Extender called txtExtend which limits the input in a Textbox called ‘txtName’ to certain characters. You can set any of the properties in the Page_Load event, or in a function to get a FilteredTextBox Extender that works according to your custom code-behind logic.


Also notice the new property I have introduced here: the FilterInterval. The FilteredTextBox Extender filters the textbox on timed intervals, and the FilterInterval property can be used to change the interval time if you wish. The value defaults to 250ms.




We have learnt how to use the FilteredTextBox in ASP.Net, and to leverage the functionality it provides to help our users input correct data. While the FilteredTextBox will definitely help lessen the incidence of errors in your application, you must also remember that it is not a guarantee of correct input and you must still have your code-behind validation in place.

This is because the FilteredTextBox Extender is a Javascript control. If the users disables Javascript on his browser or has plugins like ‘Noscript’ installed, the Javascript may be stopped from running and the functionality of the FilteredTextBox Extender will be lost. That is why do not use the extender to guarantee correct input in critical applications.

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