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In most modern browsers (including Internet Explorer 5 or later and any version of Firefox), ASP.NET automatically adds JavaScript code for client-side validation. In this case, when the user clicks a CausesValidation button, the same error messages will appear without the page needing to be submitted and returned from the server. This increases the responsiveness of your web page. However, even if the page validates successfully on the client side, ASP.NET still revalidates it when it s received at the server. This is because it s easy for an experienced user to circumvent client-side validation. For example, a malicious user might delete the block of JavaScript validation code and continue working with the page. By performing the validation at both ends, ASP.NET makes sure your application can be as responsive as possible while also remaining secure.

The validation controls are found in the System.Web.UI.WebControls namespace and inherit from the BaseValidator class. This class defines the basic functionality for a validation control. Table 10-2 describes its key properties.

Includes code blocks after a view has been rendered Creates an autocomplete text field Creates a <div> element for Ajax updates Closes an Ajaxed <div> element Creates a draggable element; requires the Scriptaculous animation libraries Creates a droppable element; requires Scriptaculous Creates an area that triggers an Ajax response when a draggable is dropped onto it Creates an editor control that is swapped for the element when triggered by the user; requires Scriptaculous Creates a form element that runs in the background when submitted Returns true if the current request is a Prototype update Creates a link to run an Ajax call Triggers an Ajax response when the observed field is changed Observes a form and triggers an Ajax response when changed Creates Ajax functions to be run, usually in conjunction with a link() event Triggers an Ajax response at a specified time interval Creates a slider control; requires Scriptaculous Makes lists or other objects sortable; requires Scriptaculous Renders a form submit button that triggers an Ajax form submission

Identifies the control that this validator will check. Each validator can verify the value in one input control. However, it s perfectly reasonable to stack validators in other words, attach several validators to one input control to perform more than one type of error checking. If validation fails, the validator control can display a text message (set by the ErrorMessage property). By changing the ForeColor, you can make this message stand out in angry red lettering. Allows you to configure whether this error message will be inserted into the page dynamically when it s needed (Dynamic) or whether an appropriate space will be reserved for the message (Static). Dynamic is useful when you re placing several validators next to each other. That way, the space will expand to fit the currently active error indicators, and you won t be left with any unseemly whitespace. Static is useful when the validator is in a table and you don t want the width of the cell to collapse when no message is displayed Finally, you can also choose None to hide the error message altogether. After validation is performed, this returns True or False depending on whether it succeeded or failed. Generally, you ll check the state of the entire page by looking at its IsValid property instead to find out if all the validation controls succeeded. When set to False, automatic validation will not be performed for this control when the page is submitted. If set to True, ASP.NET will add JavaScript and DHTML code to allow client-side validation on browsers that support it.

When using a validation control, the only properties you need to implement are ControlToValidate and ErrorMessage. In addition, you may need to implement the properties that are used for your specific validator. Table 10-3 outlines these properties.

Later in this chapter (in the A Validated Customer Form section), you ll see a customer form example that demonstrates each type of validation.

Like all other helpers, the Ajax helper must be initialized in the controller by including it as a value in the var $helpers array: var $helpers = array('Html','Form','Ajax'); Then, in the view, the Ajax helper functions are called by using the $ajax object. For example: $ajax->submit(); Of course, parameters are passed to the function, depending on the function being used. $ajax->submit('Submit',array('url'=>'/comments/add','update'=>'comments_add'));

The following periodicals provide useful information about Excel data analysis tools: Inside Microsoft Excel (Rochester, NY: Element K Journals), http://www.elementkjournals.com Working Smarter with Microsoft Excel (Glen Ellyn, IL: OneOnOne Computer Training), http://www.working-smarter.com