November 2012
Intermediate to advanced
888 pages
54h 46m
Polish
Content preview from Ruby. Receptury
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15.10. Unieszkodliwianie kodu HTML i JavaScript przed wyświetlaniem
Problem
Chcemy wyświetlić dane, które mogą zawierać kod HTML lub JavaScript, ale nie chcemy, aby przeglądarka zinterpretowała go jako kod. Jest to szczególnie istotne w przypadku wyświetlania danych wprowadzanych przez użytkowników.
Rozwiązanie
Aby unieszkodliwić encje HTML zapisane w ciągu znaków, należy przekazać ciąg do funkcji pomocniczej h(). A zatem, zamiast zapisu:
<%= @data %>
należy zapisać:
<%=h @data %>
Funkcja pomocnicza h() przekształca następujące znaki na ich odpowiedniki w postaci encji HTML: ampersand (&), cudzysłów (”), lewy nawias trójkątny (<) i prawy nawias trójkątny (>).
Dyskusja
Definicji funkcji pomocniczej h() na próżno by szukać w kodzie ...
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