Yew Hooks

Demos | Examples | Docs

Hooks for Yew, inspired by streamich/react-use, alibaba/hooks and vueuse/vueuse.

use yew_hooks::prelude::*;

#[function_component(Counter)]
fn counter() -> Html {
    let counter = use_counter(0);

    let onincrease = {
        let counter = counter.clone();
        Callback::from(move |_| counter.increase())
    };
    let ondecrease = {
        let counter = counter.clone();
        Callback::from(move |_| counter.decrease())
    };

    html! {
        <>
            <button onclick={onincrease}>{ "Increase" }</button>
            <button onclick={ondecrease}>{ "Decrease" }</button>
            <b>{ "Current value: " }</b>
            { *counter }
        </>
    }
}

Hooks

State

• use_toggle - tracks state of counterparts.
• use_bool_toggle - tracks state of a boolean.
• use_counter - tracks state of a number.
• use_latest - returns the latest immutable ref to state or props.
• use_mut_latest - returns the latest mutable ref to state or props.
• use_previous - returns the previous immutable ref to state or props.
• use_list - tracks state of a list.
• use_map - tracks state of a hash map.
• use_set - tracks state of a hash set.
• use_queue - tracks state of a queue.
• use_raf_state - creates set method which only updates after requestAnimationFrame.
• use_state_ptr_eq - similar to use_state_eq, but checks if the two Rcs of values point to the same allocation.
• use_renders_count - counts component renders.
• use_default - returns the default value when state is None.
• use_debounce_state - debounces state.
• use_throttle_state - throttles state.

Side-effects

• use_async - resolves an async future, e.g. fetching REST api.
• use_websocket - communicates with WebSocket.
• use_title - sets title of the page.
• use_favicon - sets favicon of the page.
• use_local_storage - manages a value in localStorage.
• use_session_storage - manages a value in sessionStorage.
• use_before_unload - shows browser alert when user try to reload or close the page.
• use_debounce - debounces a function.
• use_debounce_effect - debounces an effect.
• use_throttle - throttles a function.
• use_throttle_effect - throttles an effect.
• use_clipboard - reads from or writes to clipboard for text/bytes.

Lifecycles

• use_effect_once - a modified use_effect hook that only runs once.
• use_effect_update - runs an effect only on updates.
• use_mount - calls mount callbacks.
• use_unmount - calls unmount callbacks.
• use_is_first_mount - checks if current render is first.
• use_is_mounted - tracks if component is mounted.
• use_event - subscribes to events.
• use_logger - logs in console as component goes through life cycles.

Animations

• use_timeout - schedules a timeout to invoke callback.
• use_interval - schedules an interval to invoke callback.
• use_update - returns a callback, which re-renders component when called.
• use_raf - re-renders component on each requestAnimationFrame.

Sensors

• use_window_size - tracks Window dimensions.
• use_window_scroll - tracks Window scroll position.
• use_scroll - tracks an HTML element's scroll position.
• use_scrolling - tracks whether HTML element is scrolling.
• use_infinite_scroll - infinite scrolling of the element.
• use_location - tracks brower's location value.
• use_hash - tracks brower's location hash value.
• use_search_param - tracks brower's location search param value.
• use_size - tracks an HTML element's dimensions using the ResizeObserver API.
• use_measure - tracks an HTML element's dimensions using the ResizeObserver API.
• use_geolocation - tracks user's geographic location.
• use_swipe - detects swipe based on TouchEvent.
• use_visible - checks if an element is visible.
• use_hovered - checks if an element is hovered.

UI

• use_click_away - triggers a callback when user clicks outside the target element.
• use_drag - tracks file, link and copy-paste drags, used along with use_drop hook.
• use_drop - tracks file, link and copy-paste drops.
• use_media - plays video or audio and exposes its controls.

Examples

use_counter demo

use yew::prelude::*;
use yew_hooks::prelude::*;

#[function_component(Counter)]
fn counter() -> Html {
    let counter = use_counter(0);

    let onincrease = {
        let counter = counter.clone();
        Callback::from(move |_| counter.increase())
    };
    let ondecrease = {
        let counter = counter.clone();
        Callback::from(move |_| counter.decrease())
    };
    let onincreaseby = {
        let counter = counter.clone();
        Callback::from(move |_| counter.increase_by(10))
    };
    let ondecreaseby = {
        let counter = counter.clone();
        Callback::from(move |_| counter.decrease_by(10))
    };
    let onset = {
        let counter = counter.clone();
        Callback::from(move |_| counter.set(100))
    };
    let onreset = {
        let counter = counter.clone();
        Callback::from(move |_| counter.reset())
    };

    html! {
        <div>
            <button onclick={onincrease}>{ "Increase" }</button>
            <button onclick={ondecrease}>{ "Decrease" }</button>
            <button onclick={onincreaseby}>{ "Increase by 10" }</button>
            <button onclick={ondecreaseby}>{ "Decrease by 10" }</button>
            <button onclick={onset}>{ "Set to 100" }</button>
            <button onclick={onreset}>{ "Reset" }</button>
            <p>
                <b>{ "Current value: " }</b>
                { *counter }
            </p>
        </div>
    }
}

use_async demo

use serde::{de::DeserializeOwned, Deserialize, Serialize};
use yew::prelude::*;
use yew_hooks::prelude::*;

#[function_component(UseAsync)]
pub fn async_demo() -> Html {
    let state = use_async(async move { fetch_repo("jetli/yew-hooks".to_string()).await });

    let onclick = {
        let state = state.clone();
        Callback::from(move |_| {
            // You can trigger to run in callback or use_effect.
            state.run();
        })
    };

    html! {
        <div>
            <button {onclick} disabled={state.loading}>{ "Start to load repo: jetli/yew-hooks" }</button>
            <p>
                {
                    if state.loading {
                        html! { "Loading, wait a sec..." }
                    } else {
                        html! {}
                    }
                }
            </p>
            {
                if let Some(repo) = &state.data {
                    html! {
                        <>
                            <p>{ "Repo name: " }<b>{ &repo.name }</b></p>
                            <p>{ "Repo full name: " }<b>{ &repo.full_name }</b></p>
                            <p>{ "Repo description: " }<b>{ &repo.description }</b></p>

                            <p>{ "Owner name: " }<b>{ &repo.owner.login }</b></p>
                            <p>{ "Owner avatar: " }<b><br/><img alt="avatar" src={repo.owner.avatar_url.clone()} /></b></p>
                        </>
                        }
                } else {
                    html! {}
                }
            }
            <p>
                {
                    if let Some(error) = &state.error {
                        match error {
                            Error::DeserializeError => html! { "DeserializeError" },
                            Error::RequestError => html! { "RequestError" },
                        }
                    } else {
                        html! {}
                    }
                }
            </p>
        </div>
    }
}

async fn fetch_repo(repo: String) -> Result<Repo, Error> {
    fetch::<Repo>(format!("https://api.github.com/repos/{}", repo)).await
}

/// You can use reqwest or other crates to fetch your api.
async fn fetch<T>(url: String) -> Result<T, Error>
where
    T: DeserializeOwned,
{
    let response = reqwest::get(url).await;
    if let Ok(data) = response {
        if let Ok(repo) = data.json::<T>().await {
            Ok(repo)
        } else {
            Err(Error::DeserializeError)
        }
    } else {
        Err(Error::RequestError)
    }
}

#[derive(Serialize, Deserialize, Clone, Debug, PartialEq)]
struct User {
    id: i32,
    login: String,
    avatar_url: String,
}

#[derive(Serialize, Deserialize, Clone, Debug, PartialEq)]
struct Repo {
    id: i32,
    name: String,
    full_name: String,
    description: String,
    owner: User,
}

// You can use thiserror to define your errors.
#[derive(Clone, Debug, PartialEq)]
enum Error {
    RequestError,
    DeserializeError,
    // etc.
}

use_websocket demo

use yew::prelude::*;
use yew_hooks::prelude::*;

#[function_component(UseWebSocket)]
pub fn web_socket() -> Html {
    let history = use_list(vec![]);
    let ws = use_websocket("wss://echo.websocket.events/".to_string());

    let onclick = {
        let ws = ws.clone();
        let history = history.clone();
        Callback::from(move |_| {
            let message = "Hello, world!".to_string();
            ws.send(message.clone());
            history.push(format!("[send]: {}", message));
        })
    };

    {
        let history = history.clone();
        let ws = ws.clone();
        use_effect_with(
            ws.message,
            move |message| {
                if let Some(message) = &**message {
                    history.push(format!("[recv]: {}", message.clone()));
                }
                || ()
            },
        );
    }

    html! {
        <div>
            <p>
                <button {onclick} disabled={*ws.ready_state != UseWebSocketReadyState::Open}>{ "Send" }</button>
            </p>
            <p>
                <b>{ "Message history: " }</b>
            </p>
            {
                for history.current().iter().map(|message| {
                    html! {
                        <p>{ message }</p>
                    }
                })
            }
        </div>
    }
}

Demo

Check out a live demo

Contribute

Feel free to take a look at the current issues in this repo for anything that currently needs to be worked on.

You are also welcome to open a PR or a new issue if you see something is missing or could be improved upon.

License

Apache-2.0/MIT