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Diffstat (limited to 'doc/manual.tex')
| -rw-r--r-- | doc/manual.tex | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/doc/manual.tex b/doc/manual.tex index 0550d081..5935ccbf 100644 --- a/doc/manual.tex +++ b/doc/manual.tex @@ -2348,13 +2348,15 @@ $$\begin{array}{rrcll} &&& \texttt{<}g\texttt{>}l^*\texttt{</}x\texttt{>} & \textrm{tag with children} \\ &&& \{e\} & \textrm{computed XML fragment} \\ &&& \{[e]\} & \textrm{injection of an Ur expression, via the $\mt{Top}.\mt{txt}$ function} \\ - \textrm{Tag} & g &::=& h \; (x = v)^* \\ + \textrm{Tag} & g &::=& h \; (x [= v])^* \\ \textrm{Tag head} & h &::=& x & \textrm{tag name} \\ &&& h\{c\} & \textrm{constructor parameter} \\ \textrm{Attribute value} & v &::=& \ell & \textrm{literal value} \\ &&& \{e\} & \textrm{computed value} \\ \end{array}$$ +When the optional $= v$ is omitted in an XML attribute, the attribute is assigned value $\mt{True}$ in Ur/Web, and it is rendered to HTML merely as including the attribute name without a value. If such a Boolean attribute is manually set to value $\mt{False}$, then it is omitted altogether in generating HTML. + Further, there is a special convenience and compatibility form for setting CSS classes of tags. If a \cd{class} attribute has a value that is a string literal, the literal is parsed in the usual HTML way and replaced with calls to appropriate Ur/Web combinators. Any dashes in the text are replaced with underscores to determine Ur identifiers. The same desugaring can be accessed in a normal expression context by calling the pseudo-function \cd{CLASS} on a string literal. Similar support is provided for \cd{style} attributes. Normal CSS syntax may be used in string literals that are \cd{style} attribute values, and the desugaring may be accessed elsewhere with the pseudo-function \cd{STYLE}. |