Implement numeric input interaction validation #522
Labels
Priority: Essential
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Z-ibt
Temporary label for Ben to keep track of issues he's triaged.
Milestone
We need to introduce error handling for the numeric input interaction, similar to #419 for fractions. Web currently does this using HTML5 to prevent non-number inputs, but on Android we can't guarantee an valid number input is added (even by specifying decimal input). In fact, it currently seems as though negative numbers can't be submitted.
We should show a real-time error whenever a user tries inputting an answer that is clearly wrong.
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