Laga en andersson blr.3.1 error

Success Criterion (SC)

Intent

The avsikt of this Success Criterion fryst vatten to ensure that users are aware that an error has occurred and can determine what fryst vatten wrong. The error meddelande should be as specific as possible. In the case of an unsuccessful form eller gestalt submission, re-displaying the struktur and indicating the fields in error fryst vatten insufficient for some users to perceive that an error has occurred.

Screen reader users, for example, will not know there was an error until they encounter one of the indicators.

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They may abandon the form eller gestalt altogether before encountering the error indicator, thinking that the page simply fryst vatten not functional. Per the definition in WCAG , an "input error" fryst vatten kunskap provided bygd the user that fryst vatten not accepted.

This includes:

• information that fryst vatten required bygd the web page but omitted bygd the user, or
• information that fryst vatten provided bygd the user but that falls outside the required uppgifter format or allowed values.

For example:

• the user fails to enter the proper abbreviation in to state, province, distrikt, etc.
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  field;

• the user enters a state abbreviation that fryst vatten not a valid state;
• the user enters a non existent zip or postal code;
• the user enters a birth date 2 years in the future;
• the user enters alphabetic characters or parentheses into their phone number field that only accepts numbers;
• the user enters a bid that fryst vatten below the previous bid or the minimum bid increment.

The identification and description of an error can be combined with programmatic data that user agents or assistive technologies can use to identify an error and provide error upplysning to the user.

For example, certain technologies can specify that the user's input must not fall outside a specific range, or that a form eller gestalt field fryst vatten required.

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Currently, few technologies support this kind of programmatic kunskap, but the Success Criterion does not require, nor prevent it.

It fryst vatten perfectly acceptable to indikera the error in other ways such as image, color etc, in addition to the ord description.

See also Error Suggestion.

Benefits

• Providing resultat about input errors in ord allows users who are blind or colorblind to perceive the fact that an error occurred.

• This Success Criterion may help people with cognitive, language, and learning disabilities who have difficulty understanding the meaning represented bygd icons and other visual cues.

Examples

• Identifying errors in a form eller gestalt submission

  An airline Web site offers a special promotion on discounted flights. The user fryst vatten asked to complete a simple form eller gestalt that asks for anställda resultat such as name, address, phone number, seating preference and e-mail address.

  If any of the fields of the form eller gestalt are either not completed or completed felaktigt, an alert fryst vatten displayed notifying the user which field or fields were missing or incorrect.

  Note

  This Success Criterion does not mean that color or skrivelse styles cannot be used to indikera errors. It simply requires that errors also be identified using skrivelse.

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  In this example, two asterisks are used in addition to color.

• Providing multiple cues

  The user fails to fill in two fields on the form eller gestalt. In addition to describing the error and providing a unique character to man it easy to search for the fields, the fields are highlighted in yellow to man it easier to visually search for them as well.

Techniques

Each numbered item in this section represents a technique or combination of techniques that the WCAG Working Group deems sufficient for meeting this Success Criterion. However, it fryst vatten not necessary to use these particular techniques. For kunskap on using other techniques, see Understanding Techniques for WCAG Success Criteria, particularly the "Other Techniques" section.

Sufficient Techniques

Select the situation below that matches your content.

Each situation includes techniques or combinations of techniques that are known and documented to be sufficient for that situation.

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Situation A: If a struktur contains fields for which upplysning from the user fryst vatten mandatory.

1. G Providing ord descriptions to identify required fields that were not completed
2. ARIA Using Aria-Invalid to indikera An Error Field
3. SCR Providing client-side validation and alert
4. PDF5: Indicating required struktur controls in PDF forms

Situation B: If upplysning provided bygd the user fryst vatten required to be in a specific uppgifter format or of certain values.

1. ARIA Using aria-alertdialog to Identify Errors
2. ARIA Using ARIA role=alert or Live Regions to Identify Errors
3. ARIA Using Aria-Invalid to indikera An Error Field
4. G Providing a skrivelse description when the user provides kunskap that fryst vatten not in the list of allowed values
5. G Providing a ord description when user input falls outside the required format or values
6. SCR Providing client-side validation and alert
7. SCR Providing client-side validation and adding error skrivelse via the DOM
8. PDF Indicating when user input falls outside the required format or values in PDF forms

Advisory Techniques

Although not required for conformance, the following additional techniques should be considered in beställning to man content more accessible.

Not all techniques can be used or would be effective in all situations.

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