Struct OptionsBy 

pub struct OptionsBy {
    pub field: String,
    pub options: BTreeMap<String, Vec<SelectOption>>,
}

A select whose options depend on another column: the browser looks the row’s value of field up in options. A value with no entry offers no choices.

Fields

field: String

options: BTreeMap<String, Vec<SelectOption>>

Implementations

impl OptionsBy

pub fn new(field: impl Into<String>) -> Self

Examples found in repository

examples/library/main.rs (line 133)

    fn schema(&self, ctx: &Context) -> Result<Schema, ApiError> {
        let genres = Self::genres(ctx)?;
        let branches = Self::branches(ctx)?;

        let mut names: Vec<&str> = genres.iter().map(|g| g.genre.as_str()).collect();
        names.sort_unstable();
        names.dedup();

        let mut by_genre = OptionsBy::new("genre");
        for genre in &names {
            let subgenres: Vec<&str> = genres
                .iter()
                .filter(|g| g.genre == *genre)
                .map(|g| g.subgenre.as_str())
                .collect();
            by_genre.insert(*genre, subgenres);
        }

        // Wide enough for the longest subgenre there is, computed here so the
        // browser does not have to measure anything. It is the count of
        // characters, nothing more: what the control puts around them is the
        // bundle's business.
        let widest = genres.iter().map(|g| g.subgenre.len()).max().unwrap_or(0);
        let width_ch = u16::try_from(widest.max(8)).unwrap_or(u16::MAX);

        // A key that shows a branch's name and stores its code.
        let branch_keys: Vec<SelectOption> = branches
            .iter()
            .map(|b| SelectOption::labelled(&b.code, &b.name))
            .collect();

        let mut publishers: Vec<String> = ctx
            .optional_rows::<Book>(BOOKS_FILE)?
            .iter()
            .map(|b| b.publisher.trim().to_string())
            .filter(|p| !p.is_empty())
            .collect();
        publishers.sort_unstable();
        publishers.dedup();

        Ok(Schema::new([
            Column::string("title", "Title").width_ch(30),
            Column::string("author_first", "First").width_ch(12),
            Column::string("author_last", "Last").width_ch(14),
            Column::select("genre", "Genre", names)
                .allow_empty()
                .cascades_to(["subgenre"]),
            Column::select_by("subgenre", "Subgenre", by_genre)
                .allow_empty()
                .width_ch(width_ch),
            Column::select(
                "edition",
                "Edition",
                [
                    SelectOption::labelled("1", "First (1)"),
                    SelectOption::labelled("2", "Second (2)"),
                    SelectOption::labelled("3", "Third (3)"),
                ],
            )
            .allow_empty()
            .numeric_value(),
            // A year is a whole number; a rating is not, which is what the
            // absence of int_only means.
            Column::number("year", "Year").int_only().width_ch(4),
            Column::number("copies", "Copies").int_only().width_ch(3),
            Column::number("rating", "Rating").width_ch(3),
            Column::boolean("lent", "Lent"),
            Column::string("publisher", "Publisher")
                .width_ch(20)
                .datalist("publishers"),
            Column::string("donor", "Donated by")
                .width_ch(20)
                .datalist("reader-names"),
            Column::spaced_string("call_number", "Call no.").width_ch(14),
            Column::string("pronunciation", "Say")
                .width_ch(16)
                .speak(Speak::new(
                    "http://127.0.0.1:8765/say?text={value}",
                    "table-editor-speech-url",
                )),
            Column::map(
                "shelved",
                "Shelved",
                MapSpec::new("Branch", "Copies")
                    .chips_show_key()
                    .key_options(branch_keys)
                    .value_options([
                        SelectOption::labelled("one", "One"),
                        SelectOption::labelled("several", "Several"),
                        SelectOption::labelled("many", "Many"),
                    ]),
            ),
            Column::string("due", "Due").width_ch(10),
            Column::string("link", "Catalogue").width_ch(30),
            Column::computed("shelf", "Shelf mark", "shelf").width_ch(18),
            Column::text("notes", "Notes").wide(),
        ])
        .sortable()
        .datalist("publishers", Datalist::fixed(publishers))
        .datalist(
            "reader-names",
            Datalist::from_rows(["author_last", "author_first"], ", "),
        )
        .new_row(
            NewRow::new()
                .with("title", "")
                .with("author_first", "")
                .with("author_last", "")
                .with("genre", "")
                .with("subgenre", "")
                .with("publisher", "")
                .with("donor", "")
                .with("call_number", "")
                .with("pronunciation", "")
                .with("due", "")
                .with("link", "")
                .with("notes", "")
                .with("copies", 1)
                .carry_forward(["genre", "subgenre", "publisher"]),
        ))
    }

pub fn with( self, value: impl Into<String>, options: impl IntoIterator<Item = impl Into<SelectOption>>, ) -> Self

pub fn insert( &mut self, value: impl Into<String>, options: impl IntoIterator<Item = impl Into<SelectOption>>, )

Examples found in repository

examples/library/main.rs (line 140)

    fn schema(&self, ctx: &Context) -> Result<Schema, ApiError> {
        let genres = Self::genres(ctx)?;
        let branches = Self::branches(ctx)?;

        let mut names: Vec<&str> = genres.iter().map(|g| g.genre.as_str()).collect();
        names.sort_unstable();
        names.dedup();

        let mut by_genre = OptionsBy::new("genre");
        for genre in &names {
            let subgenres: Vec<&str> = genres
                .iter()
                .filter(|g| g.genre == *genre)
                .map(|g| g.subgenre.as_str())
                .collect();
            by_genre.insert(*genre, subgenres);
        }

        // Wide enough for the longest subgenre there is, computed here so the
        // browser does not have to measure anything. It is the count of
        // characters, nothing more: what the control puts around them is the
        // bundle's business.
        let widest = genres.iter().map(|g| g.subgenre.len()).max().unwrap_or(0);
        let width_ch = u16::try_from(widest.max(8)).unwrap_or(u16::MAX);

        // A key that shows a branch's name and stores its code.
        let branch_keys: Vec<SelectOption> = branches
            .iter()
            .map(|b| SelectOption::labelled(&b.code, &b.name))
            .collect();

        let mut publishers: Vec<String> = ctx
            .optional_rows::<Book>(BOOKS_FILE)?
            .iter()
            .map(|b| b.publisher.trim().to_string())
            .filter(|p| !p.is_empty())
            .collect();
        publishers.sort_unstable();
        publishers.dedup();

        Ok(Schema::new([
            Column::string("title", "Title").width_ch(30),
            Column::string("author_first", "First").width_ch(12),
            Column::string("author_last", "Last").width_ch(14),
            Column::select("genre", "Genre", names)
                .allow_empty()
                .cascades_to(["subgenre"]),
            Column::select_by("subgenre", "Subgenre", by_genre)
                .allow_empty()
                .width_ch(width_ch),
            Column::select(
                "edition",
                "Edition",
                [
                    SelectOption::labelled("1", "First (1)"),
                    SelectOption::labelled("2", "Second (2)"),
                    SelectOption::labelled("3", "Third (3)"),
                ],
            )
            .allow_empty()
            .numeric_value(),
            // A year is a whole number; a rating is not, which is what the
            // absence of int_only means.
            Column::number("year", "Year").int_only().width_ch(4),
            Column::number("copies", "Copies").int_only().width_ch(3),
            Column::number("rating", "Rating").width_ch(3),
            Column::boolean("lent", "Lent"),
            Column::string("publisher", "Publisher")
                .width_ch(20)
                .datalist("publishers"),
            Column::string("donor", "Donated by")
                .width_ch(20)
                .datalist("reader-names"),
            Column::spaced_string("call_number", "Call no.").width_ch(14),
            Column::string("pronunciation", "Say")
                .width_ch(16)
                .speak(Speak::new(
                    "http://127.0.0.1:8765/say?text={value}",
                    "table-editor-speech-url",
                )),
            Column::map(
                "shelved",
                "Shelved",
                MapSpec::new("Branch", "Copies")
                    .chips_show_key()
                    .key_options(branch_keys)
                    .value_options([
                        SelectOption::labelled("one", "One"),
                        SelectOption::labelled("several", "Several"),
                        SelectOption::labelled("many", "Many"),
                    ]),
            ),
            Column::string("due", "Due").width_ch(10),
            Column::string("link", "Catalogue").width_ch(30),
            Column::computed("shelf", "Shelf mark", "shelf").width_ch(18),
            Column::text("notes", "Notes").wide(),
        ])
        .sortable()
        .datalist("publishers", Datalist::fixed(publishers))
        .datalist(
            "reader-names",
            Datalist::from_rows(["author_last", "author_first"], ", "),
        )
        .new_row(
            NewRow::new()
                .with("title", "")
                .with("author_first", "")
                .with("author_last", "")
                .with("genre", "")
                .with("subgenre", "")
                .with("publisher", "")
                .with("donor", "")
                .with("call_number", "")
                .with("pronunciation", "")
                .with("due", "")
                .with("link", "")
                .with("notes", "")
                .with("copies", 1)
                .carry_forward(["genre", "subgenre", "publisher"]),
        ))
    }

Trait Implementations

impl Clone for OptionsBy

fn clone(&self) -> OptionsBy

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for OptionsBy

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for OptionsBy

impl PartialEq for OptionsBy

fn eq(&self, other: &OptionsBy) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl Serialize for OptionsBy

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for OptionsBy