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By default, the $session->flash() function in the layout, when it receives a flash message from the setFlash() function, will display the message inside a standardized HTML string: <div id="flashMessage" class="message">Invalid post.</div> To customize the HTML wrapped around the flash message, you can add a new layout file in the app/views/layouts folder and set the layout parameter in the setFlash() function. For example, you could create a custom flash layout named flash.ctp in the layouts directory with the following single line of code: <div class="error_message">< =$content_for_layout; ></div> Then, in the setFlash() function, you can pass the new layout parameter like so: $this->Session->setFlash('Invalid Post.','flash'); When the flash message is displayed, it will not replace the whole layout for the view. The entire contents of the new flash layout file will be placed where the $session->flash() function appears in the layout. Then, where $content_for_layout appears in the flash.ctp file, the flash message will be inserted. Setting the layout parameter allows full customization of how the flash messages are displayed, but it will require creating a separate layout file to hold that custom HTML. If, for some reason, the flash needed to contain more specifics regarding the error, you could pass along variables to the layout by adding them in the third slot of the function as an array: $this->Session->setFlash( Invalid post. , flash ,array( story =>$id));

Finally, any control that has its AutoPostBack property set to True is connected to the __doPostBack() function using the onclick or onchange attributes These attributes indicate what action the browser should take in response to the client-side JavaScript events onclick and onchange The following example shows the tag for a list control named lstBackColor, which posts back automatically Whenever the user changes the selection in the list, the client-side onchange event fires The browser then calls the __doPostBack() function, which sends the page back to the server <select ID="lstBackColor" onchange="__doPostBack('lstBackColor','')" language="javascript">.

In other words, ASP.NET automatically changes a client-side JavaScript event into a serverside ASP.NET event, using the __doPostBack() function as an intermediary. Figure 6-13 shows this process.

To filter data using Advanced Filter, follow these steps: 1. Insert at least three blank rows above the group of cells that you want to filter. This blank area will serve as the criteria cell group or criteria range. The criteria range must have column labels. Make sure there is at least one blank row between the criteria range and the group of cells that you want to filter. 2. In the rows below the column labels, type the criteria that you want to use. Figure B-1 shows examples of criteria.

To understand how web control events work, you need to have a solid understanding of the page life cycle. Consider what happens when a user changes a control that has the AutoPostBack property set to True: 1. On the client side, the JavaScript __doPostBack function is invoked, and the page is resubmitted to the server. 2. ASP.NET re-creates the Page object using the .aspx file. 3. ASP.NET retrieves state information from the hidden view state field and updates the controls accordingly. 4. The Page.Load event is fired. 5. The appropriate change event is fired for the control. (If more than one control has been changed, the order of change events is undetermined.) 6. The Page.Unload event fires, and the page is rendered (transformed from a set of objects to an HTML page). 7. The new page is sent to the client. To watch these events in action, it helps to create a simple event tracker application (see Figure 6-14). All this application does is write a new entry to a list control every time one of the events it is monitoring occurs. This allows you to see the order in which events are triggered.