Leptos Struct Table

Easily create Leptos table components from structs.

Features

• Easy to use - yet powerful.
• Async data loading - The data is loaded asynchronously. This allows to load data from a REST API or a database etc.
• Selection - Can be turned off or single/multi select
• Customization - You can customize every aspect of the table by plugging in your own components for rendering rows, cells, headers. See Custom Renderers for more information.
• Headless - No default styling is applied to the table. You can fully customize the classes that are applied to the table. See Classes customization for more information.
• Sorting - Optional. If turned on: Click on a column header to sort the table by that column. You can even sort by multiple columns.
• Virtualization - Only the visible rows are rendered. This allows for very large tables.
• Pagination - Instead of virtualization you can paginate the table.
• Caching - Only visible rows are loaded and cached.
• Editing - Optional. You can provide custom renderers for editable cells. See Editable Cells for more information.

Usage

use leptos::*;
use leptos_struct_table::*;

#[derive(TableRow, Clone)]
#[table(impl_vec_data_provider)]
pub struct Person {
    id: u32,
    name: String,
    age: u32,
}

fn main() {
    mount_to_body(|| {
        let rows = vec![
            Person { id: 1, name: "John".to_string(), age: 32 },
            Person { id: 2, name: "Jane".to_string(), age: 28 },
            Person { id: 3, name: "Bob".to_string(), age: 45 },
        ];

        view! {
            <table>
                <TableContent rows />
            </table>
        }
    });
}

Macro options

The #[table(...)] attribute can be used to customize the generated component. The following options are available:

Struct attributes

These attributes can be applied to the struct itself.

• sortable - Specifies that the table should be sortable. This makes the header titles clickable to control sorting. See the simple example for more information.
• classes_provider - Specifies the name of the class provider. Used to quickly customize all of the classes that are applied to the table. For convenience sensible presets for major CSS frameworks are provided. See TableClassesProvider and tailwind example for more information.
• head_cell_renderer - Specifies the name of the header cell renderer component. Used to customize the rendering of header cells. Defaults to DefaultTableHeaderRenderer. See the custom_renderers_svg example for more information.
• impl_vec_data_provider - If given, then TableDataProvider is automatically implemented for Vec<ThisStruct> to allow for easy local data use. See the simple example for more information.
• row_type - Specifies the type of the rows in the table. Defaults to the struct that this is applied to. See the custom_type example for more information.

Field attributes

These attributes can be applied to any field in the struct.

• class - Specifies the classes that are applied to each cell (head and body) in the field's column. Can be used in conjuction with classes_provider to customize the classes.
• head_class - Specifies the classes that are applied to the header cell in the field's column. Can be used in conjuction with classes_provider to customize the classes.
• cell_class - Specifies the classes that are applied to the body cells in the field's column. Can be used in conjuction with classes_provider to customize the classes.
• skip - Specifies that the field should be skipped. This is useful for fields that are not displayed in the table.
• skip_sort - Only applies if sortable is set on the struct. Specifies that the field should not be used for sorting. Clicking it's header will not do anything.
• skip_header - Makes the title of the field not be displayed in the head row.
• title - Specifies the title that is displayed in the header cell. Defaults to the field name converted to title case (this_field becomes "This Field").
• renderer - Specifies the name of the cell renderer component. Used to customize the rendering of cells. Defaults to DefaultNumberTableCellRenderer for number types and DefaultTableCellRenderer for anything else. As long as Leptos supports rendering the type it will work. If the feature chrono is enabled then DefaultNaiveDateTableCellRenderer, DefaultNaiveDateTimeTableCellRenderer and DefaultNaiveTimeTableCellRenderer are used for chrono::NaiveDate, chrono::NaiveDateTime and chrono::NaiveTime respectively.
• format - Quick way to customize the formatting of cells without having to create a custom renderer. See Formatting below for more information.
• getter - Specifies a method that returns the value of the field instead of accessing the field directly when rendering.
• none_value - Specifies a display value for Option types when they are None. Defaults to empty string

Formatting

The format attribute can be used to customize the formatting of cells. It is an easier alternative to creating a custom renderer when you just want to customize some basic formatting.

• precision - Specifies the number of digits to display after the decimal point. Only works for numbers.
• string - Specifies a format string. Currently only used for NaiveDate, NaiveDateTime and NaiveTime. See chrono::format::strftime for more information.

Classes Customization

Classes can be easily customized by using the classes_provider attribute on the struct. You can specify any type that implementats the trait TableClassesProvider. Please see the documentation for that trait for more information. You can also look at TailwindClassesPreset for an example how this can be implemented.

Example:

#[derive(TableRow, Clone)]
#[table(classes_provider = "TailwindClassesPreset")]
pub struct Book {
    id: u32,
    title: String,
}

Field Getters

Sometimes you want to display a field that is not part of the struct but a derived value either from other fields or sth entirely different. For this you can use either the FieldGetter type or the getter attribute.

Let's start with FieldGetter and see an example:

#[derive(TableRow, Clone)]
#[table(classes_provider = "TailwindClassesPreset")]
pub struct Book {
    id: u32,
    title: String,
    author: String,

    // this tells the macro that you're going to provide a method called `title_and_author` that returns a `String`
    title_and_author: FieldGetter<String>
}

impl Book {
    // Returns the value that is displayed in the column
    pub fn title_and_author(&self) -> String {
        format!("{} by {}", self.title, self.author)
    }
}

To provide maximum flexibility you can use the getter attribute.

#[derive(TableRow, Clone)]
#[table(classes_provider = "TailwindClassesPreset")]
pub struct Book {
    // this tells the macro that you're going to provide a method called `get_title` that returns a `String`
    #[table(getter = "get_title")]
    title: String,
}

impl Book {
    pub fn get_title(&self) -> String {
        format!("Title: {}", self.title)
    }
}

When to use FieldGetter vs getter attribute

A field of type FieldGetter<T> is a virtual field that doesn't really exist on the struct. Internally FieldGetter is just a new-typed PhatomData and thus is removed during compilation. Hence it doesn't increase memory usage. That means you should use it for purely derived data.

The getter attribute should be used on a field that actually exists on the struct but whose value you want to modify before it's rendered.

Custom Renderers

Custom renderers can be used to customize almost every aspect of the table. They are specified by using the various ...renderer attributes on the struct or fields or props of the TableContent component. To implement a custom renderer please have a look at the default renderers listed below.

On the struct level you can use this attribute:

• thead_cell_renderer - Defaults to DefaultTableHeaderCellRenderer which renders <th><span>Title</span></th> together with sorting functionality (if enabled).

As props of the TableContent component you can use the following:

• thead_renderer - Defaults to DefaultTableHeadRenderer which just renders the tag thead.
• thead_row_renderer - Defaults to DefaultTableHeadRowRenderer which just renders the tag tr.
• tbody_renderer - Defaults to the tag tbody. Takes no attributes.
• row_renderer - Defaults to DefaultTableRowRenderer.
• loading_row_renderer - Defaults to DefaultLoadingRowRenderer.
• error_row_renderer - Defaults to DefaultErrorRowRenderer.
• row_placeholder_renderer - Defaults to DefaultRowPlaceholderRenderer.

On the field level you can use the renderer attribute.

It defaults to DefaultNumberTableCellRenderer for number types and DefaultTableCellRenderer for anything else. As long as Leptos supports rendering the type it will work. If the feature chrono is enabled then DefaultNaiveDateTableCellRenderer, DefaultNaiveDateTimeTableCellRenderer and DefaultNaiveTimeTableCellRenderer are used for chrono::NaiveDate, chrono::NaiveDateTime and chrono::NaiveTime respectively.

Example:

#[derive(TableRow, Clone)]
pub struct Book {
    title: String,
    #[table(renderer = "ImageTableCellRenderer")]
    img: String,
}

// Easy cell renderer that just displays an image from an URL.
#[component]
fn ImageTableCellRenderer<F>(
    class: String,
    #[prop(into)] value: MaybeSignal<String>,
    on_change: F,
    index: usize,
) -> impl IntoView
where
    F: Fn(String) + 'static,
{
    view! {
        <td class=class>
            <img src=value alt="Book image" height="64"/>
        </td>
    }
}

For more detailed information please have a look at the custom_renderers_svg example for a complete customization.

Editable Cells

You might have noticed the type parameter F in the custom cell renderer above. This can be used to emit an event when the cell is changed. In the simplest case you can use a cell renderer that uses an <input>.

#[derive(TableRow, Clone, Default, Debug)]
#[table(impl_vec_data_provider)]
pub struct Book {
    id: u32,
    #[table(renderer = "InputCellRenderer")]
    title: String,
}

// Easy input cell renderer that emits `on_change` when the input is changed.
#[component]
fn InputCellRenderer<F>(
    class: String,
    #[prop(into)] value: MaybeSignal<String>,
    on_change: F,
    index: usize,
) -> impl IntoView
where
    F: Fn(String) + 'static,
{
    view! {
        <td class=class>
            <input type="text" value=value on:change=move |evt| { on_change(event_target_value(&evt)); } />
        </td>
    }
}

// Then in the table component you can listen to the `on_change` event:

#[component]
pub fn App() -> impl IntoView {
    let rows = vec![Book::default(), Book::default()];

    let on_change = move |evt: ChangeEvent<Book>| {
        logging::log!("Changed row at index {}:\n{:#?}", evt.row_index, evt.changed_row);
    };

    view! {
        <table>
            <TableContent rows on_change />
        </table>
    }
}

Please have a look at the editable example for fully working example.

Pagination / Virtualization / InfiniteScroll

This table component supports different display acceleration strategies. You can set them through the display_strategy prop of the TableContent component.

The following options are available. Check their docs for more details.

• DisplayStrategy::Virtualization (default)
• DisplayStrategy::InfiniteScroll
• DisplayStrategy::Pagination

Please have a look at the pagination example for more information on how to use pagination.

Contribution

All contributions are welcome. Please open an issue or a pull request if you have any ideas or problems.

Leptos Compatibility