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ยป Solutions Navigation Forums Knowledge BaseBest Practices Case + Code Examples HOWTOs SolutionsWhat does this Exclusive Area error message error messaging best practices mean? Glossary University and ResearchProjects Papers Presentations Documentation Downloads Videos File Exchange examples of good error messages User login Username * Password * Create new account Request new password What does this Exclusive Area form error messages design error message mean? Submitted by belen on Thu, 01/17/2013 - 07:39 Note: Applies to RTI Connext 4.x and above.RTI Connext uses the concept of exclusive areas (EA) to avoid
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deadlocks when user listener code calls the RTI Connext APIs.In a nutshell:Each entity has their own EAs.Controlling access into EAs is a way to prevent deadlocking situations.The rule of thumb is: do not access lower EAs.There are three ordered levels of Exclusive Areas:ParticipantEA: There is one per Participant.SubscriberEA: There is one per Subscriber. DataReaders created by a form validation error messages Subscriber share the EA of its parent.PublisherEA: There is one per Publisher. DataWriters created by a Publisher share the EA of its parent.The three EA levels are ordered in the following manner: ParticipantEA < SubscriberEA < PublisherEAIf a thread is in an EA, it can call methods associated with either a higher EA level or methods that share the same EA. It cannot call methods associated with a lower EA level, nor can it call methods that use a different EA at the same level.The following error message indicates that the application is trying to access a lower exclusive area (EA) from a higher EA:DDS_Entity_check_callback_infoI:illegal operation due to exclusive area For example, the message may indicate that an application is trying to access a Subscriber from a Publisher's listener callback, or that a DataWriter's callback is trying to access a DataReader.See theCore Libraries and Utilities User's Manual("Entities" chapter) for more details on exclusive areas.
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Design Process E-commerce Email Eyetracking Heuristic Evaluation Human Computer Interaction Ideation Information Architecture Interaction Design International Users Intranets Management Mobile & Tablet Navigation Non-Profit Websites Personas Persuasive Design Prototyping Psychology and UX Research https://community.rti.com/kb/what-does-exclusive-area-error-message-mean Methods Search Social Media Strategy User Testing Visual Design Web Usability Writing for the Web Young Users Author Jakob Nielsen Don Norman Bruce "Tog" Tognazzini See all authors… All Authors (hide) Aurora Bedford Raluca Budiu Susan Farrell Therese Fessenden Kim Flaherty Sarah Gibbons Page Laubheimer Angie Li Hoa Loranger Kate Meyer Jakob Nielsen Don Norman Kara Pernice Christian Rohrer Amy Schade Katie Sherwin Bruce "Tog" Tognazzini Kathryn https://www.nngroup.com/articles/error-message-guidelines/ Whitenton Kate Williamson Recent Articles 5 Information Architecture Warning Signs in Your Analytics Reports 28 Tips for Creating Great Qualitative Surveys Design Thinking Builds Strong Teams Augmented Reality: What Does It Mean for UX? Universal Navigation: Connecting Subsites to Main Sites See all articles… Popular Articles Usability 101: Introduction to Usability Top 10 Mistakes in Web Design How Users Read on the Web F-Shaped Pattern For Reading Web Content 10 Usability Heuristics for User Interface Design 10 Best Intranets of 2016 When to Use Which User-Experience Research Methods Response Times: The 3 Important Limits Why You Only Need to Test with 5 Users The Fold Manifesto: Why the Page Fold Still Matters Error Message Guidelines by Jakob Nielsen on June 24, 2001 Topics: Application Design Summary: Established wisdom holds that good error messages are polite, precise, and constructive. The Web brings a few new guidelines: Make error messages clearly visible, reduce the work required to fix the problem, and educate users along the way. The guidelines for creating effective error messages have been the same for 20 years. Good error message should include: Explicit indication that something has gone wrong. The very worst error messages are those that don't exist
Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn http://ux.stackexchange.com/questions/26173/what-is-best-practice-for-designing-form-error-messages more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us User Experience Questions Tags Users Badges Unanswered Ask Question _ User Experience Stack Exchange is a question and answer site for user experience researchers and experts. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted error message up and rise to the top What is best practice for designing form error messages? up vote 136 down vote favorite 92 I've seen quite a lot of research on form design, but so far, I haven't come across any studies on error message design best practices. The only piece of advice seems to be that each error should clearly be associated with the invalid form field that validation error message it aims to correct. Has there been any research on this? I have some specific issues I'm trying to work through and would appreciate any insight or resources. Error message location When you have live form validation, where should an error (or success) message appear in relation to the form element? Some options: To the right of the input download bmml source – Wireframes created with Balsamiq Mockups To the right of the label download bmml source Above the label download bmml source Below the label download bmml source Below the input download bmml source There are some thorny issues that also need to be taken into account regarding location: How are errors displayed for radio or checkbox groups? How wide is the error message? Is the error message multi-line? Error message visibility Besides location, I'm also interested in how the visibility of the error message affects its usability. Does it matter or is it strictly a aesthetic decision? Consider the following 3 options: download bmml source Edit: There have been some excellent points on accessibility in some of the answers so far, as well as some interesting examples. However, I really would like to see some data from actual studies, if possible. A