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When you implement the menu hook in your module, there s nothing to prevent you from adding entries to other modules paths, or even from overriding them. Typically this is done using the handy web interface provided by menu.module, which ships as part of Drupal, but you may have reasons to do this programmatically.

Just be sure the label used at the top of the procedure is the same as that used to name the error handler section of code at the bottom of the procedure 9 Add the following code at the insertion point: If ErrNumber = 13 Then sErrMsg = "A value in your data may not be numeric Please check your data" Else sErrMsg = "An unexpected error " & ErrNumber & " has occurred" End If MsgBox sErrMsg, vbOKOnly, "Error" Resume Exit_Function If an error occurs, the code redirects to the Err_Handle section Here we placed conditional logic that looks for a specific error number If we were aware of other error conditions, we could simply add them to the If..Else block or even use a Select Case statement.

his chapter discusses design patterns that create an alert. An alert points out important information to the reader by separating it from the content. There are two basic types of alerts: dynamic and static. The first three design patterns in this chapter are dynamic alerts, which dynamically display information as a user interacts with the document. The remaining alerts in this chapter are static alerts, which are always displayed in a document. The Alert design pattern is an HTML pattern, which is basically a heading followed by the alert s message. The design patterns following Alert combine it with other design patterns, demonstrating how you can combine existing design patterns to create new design patterns.

JavaScript Alert shows how to dynamically pop up an alert based on an event. Tooltip Alert shows how to create a tooltip to show the user extra information. Popup Alert shows how to pop up an alert to show the user extra information. Alert shows the basic HTML structure of an alert. Inline Alert shows how to make an alert using an inline element. Hanging Alert shows how to move the alert s heading to the left side and the content to the right side by using a hanging indent that does not require extra markup. Graphical Alert shows how to move the alert s heading to the left side and the content to the right side and replace the heading with an image. Run-in Alert shows how to run the alert s heading into the first line of the content. Floating Alert shows how to float an alert to the left or the right of the content with its heading on the left and its content on the right. Left Marginal Alert shows how to move an alert into the left margin using absolute positioning. Right Marginal Alert shows how to move an alert into the right margin using absolute positioning.

For example, devel.module (which you re probably using if you re doing serious Drupal development) has a menu item that clears Drupal s cache tables. Let s wrap that function so our function gets called first. First, we override devel.module s menu item by specifying one of our own with the same path inside our menu hook: /** * Implementation of hook_menu(). */ function mymodule_menu($may_cache) { $items = array(); if (!$may_cache && module_exist('devel')) { // Make sure devel.module is enabled. $items[] = array( 'path' => 'devel/cache/clear', // Same path that devel.module uses. 'title' => t('Wrap cache clear'), 'callback' => 'mymodule_clear_cache', 'type' => MENU_CALLBACK, 'access' => user_access('access devel information') // Same as devel.module. ); } } function mymodule_clear_cache() { drupal_set_message('We got called first!'); // Wrap the devel function normally called. devel_cache_clear(); }

Inside the If statement, we are assigning the appropriate error message to the sErrMsg variable based on what error occurred Then we show the user the message The last line of the error handler section tells the code where to resume once the error is dealt with In this case, we re telling it to resume at the line label Exit_Function where we assign an output value to our function..

HTML <h1>JavaScript Alert</h1> <p>A JavaScript alert pops up a dialog box when the user clicks on it. Its presence can be signalled by a small image<img class="alert-image" onclick="alert('Alert text goes here.');" src="help.gif" alt="alert" /> or specially styled text, such as a <em class="alert" onclick="alert('Alert text goes here.');"> dotted underline.</em> </p>