[jira] [Created] (TAP5-2539) Cancelling a form should skip server-side validation

["Bob Harner (JIRA)" <ji...@apache.org>]

Bob Harner created TAP5-2539:
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             Summary: Cancelling a form should skip server-side validation
                 Key: TAP5-2539
                 URL: https://issues.apache.org/jira/browse/TAP5-2539
             Project: Tapestry 5
          Issue Type: Improvement
          Components: tapestry-core
    Affects Versions: 5.4.1
            Reporter: Bob Harner


Ever since version 5.2, setting a Submit's (or LinkSubmit's) "mode" parameter to "cancel" causes Tapestry to skip client-side validation, but not server-side validation. This is counter-intuitive and leads to extra boiler-plate code to set a flag in onCancel() and check it in onValidate() to decide whether to perform server-side validatation. Instead, "cancel" should automatically skip server-side validation (triggering the cancel event _instead of_ validate, success and failure events).

For backward compatibility, a new symbol, "tapestry.form-cancel-client-only", will be false by default but can be overridden to true to restore the previous behavior.

The existing _mode="unconditional"_ setting will remain available for those cases where server-side validate, success and failure events should still be triggered (such as _save as draft_ scenarios) without client-side validation.

As part of this change, the documentation for Submit, LinkSubmit, EventConstants#CANCEL, SubmitMode#CANCEL and Form will be updated to remove the current ambiguities.



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