Resources · 110
Localized input: resolve number and date ambiguity
Accept and confirm values without silently changing separators, units or date order.
· 2 min
What this guide helps achieve
- Define accepted formats
- Retain raw input
- Confirm the interpreted value
- Test interactions
- Align export and storage
Quick check
- Does Intl.NumberFormat parse input?
- Should every notation be accepted?
Step-by-step method
- 01
Define accepted formats
List locale, unit, precision and examples. Separate accepted input from displayed output; a formatting library is not automatically an input parser.
Deliverable: formats and interpretation.
- 02
Retain raw input
Preserve the entry until validation. Test commas, points, grouping spaces and paste; when multiple readings are possible, ask for clarification instead of inventing intent.
Deliverable: ambiguous cases and resolution rules.
- 03
Confirm the interpreted value
Show unit, unambiguous date and interpreted amount before consequential actions. Avoid confirmation that merely repeats an ambiguous string without explaining its interpretation.
Deliverable: explicit confirmation screen.
- 04
Test interactions
Check mobile keyboards, screen readers, errors and input recovery. Do not rely on colour for explanations; keep the error associated with its field.
Deliverable: entry and correction acceptance.
- 05
Align export and storage
Send a normalised value with unit and applied rule. Check exports, redisplay and locale changes; retain useful corrections without unnecessary sensitive data.
Deliverable: verified round trip.
Choose validation or clarification
Check the observed state before choosing next steps.
One permitted interpretation
Confirm value, unit and format.
Multiple plausible readings
Ask for clarification without erasing input.
Rejected format
Explain the error and offer accessible correction.
Reusable worksheet
Complete with your authorised observations. These fields are a working template, not observed results.
| Field | Information to record |
|---|---|
| Input | Raw string and locale |
| Interpretation | Value, unit and rule |
| Acceptance | Display, correction and export |
Worked example
Illustrative situation
Illustrative case: 1,234 can be interpreted differently under different expected conventions. Repeating 1,234 does not confirm its meaning.
Decision and expected evidence
Show a unit and explicit representation of the interpreted value, or ask the user to clarify before approval.
Distinguish the mechanisms
| Mechanism | Purpose | Check or limitation |
|---|---|---|
| Input | User-provided string | May be ambiguous |
| Interpretation | Understood value and unit | Must be confirmable |
| Display | Local presentation | Does not prove correct parsing |
Management indicators
| Indicator | What it measures | First action |
|---|---|---|
| Ambiguity | Cases clarified before action | Correct silent conversions |
| Round trip | Values preserved through export and return | Inspect incompatible formats |
Common pitfalls
- Confuse formatting and input parsing
- Convert ambiguity without confirmation
- Erase input on error
Frequently asked questions
Does Intl.NumberFormat parse input?
It formats values. Define and test parsing rules for your field separately.
Should every notation be accepted?
Choose a clear contract for served languages and uses. Reject or clarify ambiguity without erasing input.
Official references
References consulted: . The method and worksheet propose checks to adapt to your context; they do not constitute certification.
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