ErrorMessageCustomization
Error Message Customization
This PG code shows how to customize (remap) the error messages students receive after submitting an incorrect response or making a syntax error when entering their answer. This requires using MathObjects or a macro file that loads MathObjects, so that a Context is defined.
You may also be interested in AnswerHints
PG problem file | Explanation |
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DOCUMENT(); loadMacros( "PGstandard.pl", "MathObjects.pl", ); TEXT(beginproblem()); |
Initialization: To be able to customize the error messages students receive, we must be using MathObjects or a macro that loads MathObjects and has a Context. |
Context("Numeric"); Context()->{error}{msg}{"Missing operand after '-'"} = "Enter '-1' instead of '-'"; $ans1 = Real("-1"); $ans2 = Formula("x-2"); |
Setup:
First, specify a Context. One way to remap the error message
is through the context. In factoring For another way to customize the error message, see the Answer Evaluation section below. |
Context()->texStrings; BEGIN_TEXT Factor \( -1 \) from \( -x+2 \). $BR \( -x + 2 = \) \{ ans_rule(5) \} \( \cdot \big( \) \{ ans_rule(10) \} \( \big) \) END_TEXT Context()->normalStrings; |
Main Text: The problem text section of the file is as we'd expect. |
ANS( $ans1->cmp() ); ANS( $ans2->cmp() ); ENDDOCUMENT(); |
Answer Evaluation:
Another way to customize the error message ANS($ans1->cmp->withPostFilter(sub { my $ans = shift; $ans->{ans_message} = "Enter '-1' instead of '-'" if $ans->{ans_message} eq "Missing operand after '-'"; return $ans; })); |
- POD documentation: answerHints.pl.html
- PG macro: answerHints.pl