跳至主要内容
版本：0.21

组件

基础​

组件可以在 html! 宏中使用

use yew::prelude::*;

#[function_component]
fn MyComponent() -> Html {
    html! {
        { "This component has no properties!" }
    }
}

#[derive(Clone, PartialEq, Properties)]
struct Props {
    user_first_name: String,
    user_last_name: String,
}

#[function_component]
fn MyComponentWithProps(props: &Props) -> Html {
    let Props { user_first_name, user_last_name } = props;
    html! {
        <>{"user_first_name: "}{user_first_name}{" and user_last_name: "}{user_last_name}</>
    }
}

let props = Props {
    user_first_name: "Bob".to_owned(),
    user_last_name: "Smith".to_owned(),
};

html!{
    <>
        // No properties
        <MyComponent />

        // With Properties
        <MyComponentWithProps user_first_name="Sam" user_last_name="Idle" />

        // With the whole set of props provided at once
        <MyComponentWithProps ..props.clone() />

        // With Properties from a variable and specific values overridden
        <MyComponentWithProps user_last_name="Elm" ..props />
    </>
};

嵌套​

如果组件在 Properties 中有 children 字段，则可以接受子组件/元素

parent.rs
use yew::prelude::*;

#[derive(PartialEq, Properties)]
struct Props {
    id: String,
    children: Html,
}

#[function_component]
fn Container(props: &Props) -> Html {
    html! {
        <div id={props.id.clone()}>
            { props.children.clone() }
        </div>
    }
}

html! {
    <Container id="container">
        <h4>{ "Hi" }</h4>
        <div>{ "Hello" }</div>
    </Container>
};

html! 宏允许你使用 ..props 语法传递一个基本表达式，而不是单独指定每个属性，类似于 Rust 的 函数更新语法。此基本表达式必须在传递任何单独的属性之后出现。当使用 children 字段传递基本属性表达式时，在 html! 宏中传递的子项将覆盖属性中已有的子项。

use yew::prelude::*;

#[derive(PartialEq, Properties)]
struct Props {
    id: String,
    children: Html,
}

#[function_component]
fn Container(props: &Props) -> Html {
    html! {
        <div id={props.id.clone()}>
            { props.children.clone() }
        </div>
    }
}

let props = yew::props!(Props {
    id: "container-2",
    children: Html::default(),
});

html! {
    <Container ..props>
        // props.children will be overwritten with this
        <span>{ "I am a child, as you can see" }</span>
    </Container>
};

相关示例​