Compliant Error Messages
Contents |
Support Module 1: Introduction to Developing Section 508 Compliant Web Content Module 2: Keyboard Access Module 3: Focus Module 4: User Interface Controls Module 5: Navigation and Frames Module 6: screen reader error messages Text Equivalents for Non-Text Elements Module 7: Color and Contrast Module 8: Flashing, accessible form validation Time-outs and Dynamic Content Module 9: Multimedia and Embedded Content Module 10: Page Structure Module 11: Tables Module 12: Alternate aria describedby for error messages Versions Developing Section 508 Compliant Web Content Page 24 of 29 User Interface Controls Identifying Errors Introduction to Identifying Errors and Suggestions Each time invalid information is submitted, an error message must be
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provided to the user. These messages must be provided in a consistent, easy-to-locate place. Each message must indicate that one or more input errors have occurred, and identify the field or fields where a correction is needed. Developers can help minimize input errors by including effective labels and instructions in form designs. This is particularly important in medical, health, financial, and legal forms. For any of accessibility error handling these forms, the design should include additional measures that allow and encourage users to review what they’ve entered before submitting the form. Error Indication The error message displayed when the user submits erroneous data on a form should be accessible and understandable to assistive technology (AT) users. Error messages should be displayed at the beginning of the form so people who use screen readers can locate the message easily. Error messages should not rely solely on sound, color, or graphics. There should always be a text equivalent so the error can be communicated to people with disabilities. Next, you’ll learn about the following related topics: Error messages Dynamic field validation Error Messages Generally, error messages that indicate the user must make corrections are displayed after the form is submitted. Error messages should be indicated clearly and not just by a color change. For example, a form is not compliant if errors are marked up with only a red font. Error message best practices include: Use the word Error to precede the message and indicate the nature of the message. Color can be used for sighted users, but an alternative should be provided for non-sighted users and peopl
Accessible Form Validation and Error Recovery Article Contents Introduction Building Usable Forms Hiding Form Labels Form Validation Error Recovery aria-invalid creating accessible forms Summary Introduction Form validation is the process of testing to ensure
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that end users enter necessary and properly formatted information into web forms. Error recovery is the
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process of guiding the user through fixing missing or improper information as detected by form validation. There are several methods of performing form validation and error recovery. http://www.section508.va.gov/support/webdev/4_7.asp These methods can typically be categorized as being, 1) server-side - the form information is submitted and analyzed by the web server through some scripting language (such as PHP, JSP, Perl, etc.) with necessary feedback messages being written to a new, generated web page, or 2) client-side - form validation and error recovery mechanisms http://webaim.org/techniques/formvalidation/ are performed within the web client or browser using JavaScript. There are advantages to each method. Advantages of server-side validation and error recovery include: The form can be completed and submitted without interruption from validation alerts, errors, or warnings. Functionality does not require that scripting be enabled or supported on the web browser. More secure - the validation mechanisms cannot be easily bypassed or modified. Advantages of client-side validation and error recovery: Validation can occur as the forms are completed and before the form data is submitted to the server. Functionality does not require server-side scripting. Some users may disable scripting. As such, developers should not require client-side scripting in order for the web form to be accurately completed and submitted. Additionally, any client-side validation or information can readily be modified or disabled. Web developers can utilize the benefits of both server-side and client-side validation and error recovery to ensure that their forms are completed in a usable and accessible manner
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