Random Form Error Summary Fixture Generator

Description

Construct caller field errors and summary links with omit/wrong-target controls, retaining independent label-binding checks and deterministic missing/broken-link answer keys.

An interface fixture makes content and state explicit so a consumer can test a rendering or interaction. Literal labels, modeled states, and calculated geometry remain separate from what a browser or assistive technology actually displays or announces.

Construct caller field errors and summary links with omit/wrong-target controls, retaining independent label-binding checks and deterministic missing/broken-link answer keys.

When to use this tool

Use this generator to create reproducible form error summary fixture cases from the supplied model or bank. Inspect the returned evidence before using cases in a test or exercise.

How to use the tool and how it works

Supply errors, selectedCount, mode in the field shapes below. Set seed when you need an explicit replay.
Run the tool and correct any input error. For generated controls, distinguish a successful fixture containing an invalid case from failure to generate the fixture.
Read errors, links, missingSummaryIds, brokenLinkIds, html. Use the conventions below. Keep answer-bearing fields separate when presenting an exercise.

Sample distinct field errors and build summary links. Control modes omit the first link or redirect it to a missing target. Delegate field label bindings and return missing summary IDs, broken links, and escaped fixture markup.^[1]

Delegated operations used for this result: label for id binding checker. Their calculation or parsing conventions apply to the corresponding result fields.^[2]

Input field	Meaning and units	Accepted input
errors	Errors	Required. Array of Object; no unknown keys.; minimum items 1; maximum items 16.
errors[].id	Literal identifier used independently of display labels.	Required. Text; minimum UTF-16 length 1; maximum UTF-16 length 32.
errors[].label	Supplied display label.	Required. Text; minimum UTF-16 length 1; maximum UTF-16 length 128.
errors[].message	Message	Required. Text; minimum UTF-16 length 1; maximum UTF-16 length 128.
selectedCount	Selected Count	Required. Safe integer; minimum 1; maximum 16.
mode	Mode	Required. Text; one of "consistent", "omit", "wrong-target".
seed	Optional numeric seed; takes precedence over context randomness. Without either, use the fixed tool.io default seed.	Optional. Safe integer.

Output field	Interpretation	Returned shape
errors	Errors	Required. Array of Object; no unknown keys.; minimum items 1; maximum items 16.
errors[].id	Literal identifier used independently of display labels.	Required. Text; minimum UTF-16 length 1; maximum UTF-16 length 32.
errors[].label	Supplied display label.	Required. Text; minimum UTF-16 length 1; maximum UTF-16 length 128.
errors[].message	Message	Required. Text; minimum UTF-16 length 1; maximum UTF-16 length 128.
errors[].binding	Binding	Required. Object; no unknown keys.
errors[].binding.bound	Bound	Required. Boolean.
errors[].binding.targetIndex	Target Index	Required. Safe integer; minimum -1; maximum 9007199254740991.
errors[].binding.duplicateId	Duplicate Id	Required. Boolean.
links	Links	Required. Array of Object; no unknown keys.; minimum items 0; maximum items 16.
links[].fieldId	Field Id	Required. Text; minimum UTF-16 length 1; maximum UTF-16 length 32.
links[].target	Target	Required. Text; maximum UTF-16 length 256.
links[].message	Message	Required. Text; minimum UTF-16 length 1; maximum UTF-16 length 128.
missingSummaryIds	Missing Summary Ids	Required. Array of Text; minimum UTF-16 length 1; maximum UTF-16 length 32.; minimum items 0; maximum items 16.
brokenLinkIds	Broken Link Ids	Required. Array of Text; minimum UTF-16 length 1; maximum UTF-16 length 32.; minimum items 0; maximum items 16.
html	Html	Required. Text; maximum UTF-16 length 131072.
randomness	Replay source and normalized 32-bit seed, or null seed for an advancing context source.	Required. Object; no unknown keys.
randomness.seed	Optional safe-integer replay seed; normalization and precedence are explained below.	Required. Safe integer. or Null.
randomness.source	Source	Required. Text; one of "context", "seed".

An explicit safe-integer seed takes precedence over injected context randomness and is normalized to an unsigned 32-bit integer. With no seed and no context source, replay uses the fixed tool.io default seed. A context source must return finite values from zero inclusive to one exclusive; its advancing state must be retained separately. randomness records the source and normalized seed, or null for context. These generators are not cryptographic random sources.

json

{
  "input": {
    "errors": [
      {
        "id": "name",
        "label": "Name",
        "message": "Enter a name"
      },
      {
        "id": "email",
        "label": "Email",
        "message": "Enter an email"
      }
    ],
    "selectedCount": 2,
    "mode": "omit",
    "seed": 42
  },
  "output": {
    "errors": [
      {
        "id": "email",
        "label": "Email",
        "message": "Enter an email",
        "binding": {
          "bound": true,
          "targetIndex": 0,
          "duplicateId": false
        }
      },
      {
        "id": "name",
        "label": "Name",
        "message": "Enter a name",
        "binding": {
          "bound": true,
          "targetIndex": 1,
          "duplicateId": false
        }
      }
    ],
    "links": [
      {
        "fieldId": "name",
        "target": "name",
        "message": "Enter a name"
      }
    ],
    "missingSummaryIds": [
      "email"
    ],
    "brokenLinkIds": [],
    "html": "<div><ul><li><a href=\"#name\">Enter a name</a></li></ul><label for=\"email\">Email</label><input id=\"email\" aria-invalid=\"true\"><p>Enter an email</p><label for=\"name\">Name</label><input id=\"name\" aria-invalid=\"true\"><p>Enter a name</p></div>",
    "randomness": {
      "seed": 42,
      "source": "seed"
    }
  }
}

Limitations and assumptions

A correct individual label binding does not repair an omitted or broken summary link. This is constructed form evidence, not a complete DOM, focus-management, or accessibility audit.
A replay requires the same complete input and implementation. The stated sampling convention applies within its eligible space. A finite draw does not exhaust all possible outputs; repeats remain possible unless a distinct-selection rule is explicit.
The field tables state structural bounds; cross-field constraints and bounded search or output budgets also apply. Unknown keys are rejected where the object contract disallows them. Input errors are distinct from null fields and deliberate invalid controls in a successful output.

Alternative or Complementary methods

For a supplied example, inspect the returned construction or delegated check directly. To evaluate a consumer, also test cases chosen for its own boundaries; a generated finite corpus does not establish exhaustive coverage.

References

Tool behavior and example: Random Form Error Summary Fixture Generator — tool.io
Calculation or validation: html/label-for-id-binding-checker — tool.io

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