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Diffstat (limited to 'doc')
| -rw-r--r-- | doc/manual.tex | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/doc/manual.tex b/doc/manual.tex index ceb012bc..00d2bc55 100644 --- a/doc/manual.tex +++ b/doc/manual.tex @@ -2093,7 +2093,13 @@ $$\begin{array}{l} \mt{val} \; \mt{fresh} : \mt{transaction} \; \mt{id} \end{array}$$ -The \cd{fresh} function is allowed on both server and client, but there is no other way to create IDs, which includes lack of a way to force an ID to match a particular string. The only semantic importance of IDs within Ur/Web is in uses of the HTML \cd{<label>} tag. IDs play a much more central role in mainstream JavaScript programming, but Ur/Web uses a very different model to enable changes to particular nodes of a page tree, as the next manual subsection explains. IDs may still be useful in interfacing with JavaScript code (for instance, through Ur/Web's FFI). +The \cd{fresh} function is allowed on both server and client, but there is no other way to create IDs, which includes lack of a way to force an ID to match a particular string. The main semantic importance of IDs within Ur/Web is in uses of the HTML \cd{<label>} tag. IDs play a much more central role in mainstream JavaScript programming, but Ur/Web uses a very different model to enable changes to particular nodes of a page tree, as the next manual subsection explains. IDs may still be useful in interfacing with JavaScript code (for instance, through Ur/Web's FFI). + +One further use of IDs is as handles for requesting that \emph{focus} be given to specific tags. + +$$\begin{array}{l} + \mt{val} \; \mt{giveFocus} : \mt{id} \to \mt{transaction} \; \mt{unit} +\end{array}$$ \subsubsection{\label{signals}Functional-Reactive Page Generation} |