Enum Datalist 

pub enum Datalist {
    Fixed {
        options: Vec<String>,
    },
    Live {
        from_rows: FromRows,
    },
}

A completion list a column’s input draws on, in one of two forms: a fixed list the server computed, or one the browser computes live from the rows on screen.

Variants

Fixed

A list the server built, typically from a sibling table.

Fields

options: Vec<String>

Live

A list built from the rows on screen.

Fields

from_rows: FromRows

Implementations

impl Datalist

pub fn fixed(options: impl IntoIterator<Item = impl Into<String>>) -> Self

Examples found in repository

examples/library/main.rs (line 224)

    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 from_rows( fields: impl IntoIterator<Item = impl Into<String>>, separator: impl Into<String>, ) -> Self

Examples found in repository

examples/library/main.rs (line 227)

    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"]),
        ))
    }

    fn validate(&self, rows: &[Book], ctx: &Context) -> Result<Vec<ValidationError>, ApiError> {
        let genres = Self::genres(ctx)?;
        let branches = Self::branches(ctx)?;
        let mut errors = Vec::new();

        for (idx, row) in rows.iter().enumerate() {
            let line = idx + 1;
            if row.title.trim().is_empty() {
                errors.push(ValidationError::field(
                    line,
                    "title",
                    "a book needs a title",
                ));
            }

            // A subgenre stands or falls with the genre it was chosen under.
            if !genres.is_empty() && !row.subgenre.is_empty() {
                let known = genres
                    .iter()
                    .any(|g| g.genre == row.genre && g.subgenre == row.subgenre);
                if !known {
                    errors.push(ValidationError::field(
                        line,
                        "subgenre",
                        format!("not a subgenre of {}", row.genre),
                    ));
                }
            }

            if !branches.is_empty() {
                for branch in row.shelved.keys() {
                    if !branches.iter().any(|b| b.code == *branch) {
                        errors.push(ValidationError::field(
                            line,
                            "shelved",
                            format!("no branch has the code {branch}"),
                        ));
                    }
                }
            }
        }

        Ok(errors)
    }

    fn derive(&self, rows: &[Book], _ctx: &Context) -> Result<Vec<Value>, ApiError> {
        Ok(rows
            .iter()
            .map(|row| json!({ "shelf": Self::shelf_mark(row) }))
            .collect())
    }

    fn siblings(&self, ctx: &Context) -> Result<Value, ApiError> {
        Ok(json!({ "genres": Self::genres(ctx)? }))
    }
}

// ── Genres ──────────────────────────────────────────────────────────────────

struct Genres;

impl TableLogic for Genres {
    type Row = Genre;

    fn name(&self) -> &'static str {
        "genres"
    }

    fn file(&self) -> &'static str {
        GENRES_FILE
    }

    fn title(&self) -> &'static str {
        "Genres"
    }

    fn schema(&self, _ctx: &Context) -> Result<Schema, ApiError> {
        Ok(Schema::new([
            Column::string("genre", "Genre").width_ch(18),
            Column::string("subgenre", "Subgenre").width_ch(22),
        ])
        .sortable()
        .new_row(
            NewRow::new()
                .with("genre", "")
                .with("subgenre", "")
                .carry_forward(["genre"]),
        ))
    }

    fn validate(&self, rows: &[Genre], _ctx: &Context) -> Result<Vec<ValidationError>, ApiError> {
        let mut errors = Vec::new();
        for (idx, row) in rows.iter().enumerate() {
            if row.genre.trim().is_empty() {
                errors.push(ValidationError::field(
                    idx + 1,
                    "genre",
                    "a genre is needed",
                ));
            }
            if row.subgenre.trim().is_empty() {
                errors.push(ValidationError::field(
                    idx + 1,
                    "subgenre",
                    "a subgenre is needed",
                ));
            }
        }
        Ok(errors)
    }
}

// ── Branches ────────────────────────────────────────────────────────────────

struct Branches;

impl TableLogic for Branches {
    type Row = Branch;

    fn name(&self) -> &'static str {
        "branches"
    }

    fn file(&self) -> &'static str {
        BRANCHES_FILE
    }

    fn title(&self) -> &'static str {
        "Branches"
    }

    fn schema(&self, _ctx: &Context) -> Result<Schema, ApiError> {
        // Row order here is the order the branches are listed in, which is a
        // choice the table makes, so this table is not sortable and rows are
        // dragged into place instead.
        Ok(Schema::new([
            Column::string("code", "Code").width_ch(3),
            Column::string("name", "Name").width_ch(22),
            Column::string("librarian_first", "Librarian").width_ch(8),
            Column::string("librarian_last", "Surname")
                .width_ch(8)
                .datalist("librarian-names"),
            Column::number("staff", "Staff").int_only().width_ch(2),
            Column::boolean("open", "Open"),
            Column::map(
                "hours",
                "Hours",
                MapSpec::new("Day", "Hours")
                    .key_options(["Monday", "Tuesday", "Wednesday", "Thursday", "Friday"])
                    .value_options([
                        SelectOption::new("09:00-17:00"),
                        SelectOption::new("12:00-20:00"),
                    ])
                    .allow_new_keys()
                    .allow_new_values(),
            ),
        ])
        .datalist(
            "librarian-names",
            Datalist::from_rows(["librarian_last"], " "),
        )
        .new_row(
            NewRow::new()
                .with("code", "")
                .with("name", "")
                .with("librarian_first", "")
                .with("librarian_last", ""),
        ))
    }

Trait Implementations

impl Clone for Datalist

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Datalist

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

Formats the value using the given formatter.

impl Eq for Datalist

impl PartialEq for Datalist

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

Equality operator ==.

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

Inequality operator !=.

impl Serialize for Datalist

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 Datalist