MessageContainer.addErrorMessage

Adds an error message that will be displayed to the user. Messages are removed automatically by the system once they have been displayed to the user.

When stopProcessing is true, all processing for the current event is stopped immediately and the page is redisplayed to the user so the error can be corrected. When stopProcessing is false, processing continues normally, except that the user is prevented from navigating forwards to another page using a Next Page Button Control or the next page button within a Page Navigation Panel Control. Note that the same restriction does not apply when navigating to another page using other methods e.g. the WebForm#gotoPage(Page) method.

Set stopProcessing to false when there is a requirement to display multiple error messages on a page. EventContext#stopExecution() can then be used at a later point to stop processing and display the messages to the user.

Messages can be displayed either locally to the message owner (a control or page) or at another location on the same page represented by a Message Control. For further information on the location and styling of messages, please see the online documentation available from the Help menu, search on message options, then follow the link to Message Options For Controls.

Javascript example:

 event.owner.addErrorMessage("Please supply a valid reference code", false);