Crate yew_html_ext
source ·Expand description
This crate provides handy extensions to Yew’s
HTML macros.
It provides html!
and html_nested!
macros that are fully backwards-compatible with the
original ones defined in Yew, meaning all one has to do to start using this crate is
just change the uses/imports of yew::html{_nested}
to yew_html_ext::html{_nested}
.
§New syntax
§for
loops
The syntax is the same as of Rust’s for
loops, the body of the loop can contain 0 or more
nodes.
use yew::{Properties, function_component, html::Html};
use yew_html_ext::html;
#[derive(PartialEq, Properties)]
struct CountdownProps {
n: usize,
}
#[function_component]
fn Countdown(props: &CountdownProps) -> Html {
html! {
<div>
for i in (0 .. props.n).rev() {
<h2>{ i }</h2>
<br />
}
</div>
}
}
In a list of nodes all nodes must have unique keys or have no key, which is why using a constant to specify a key of a node in a loop is dangerous: if the loop iterates more than once, the generated list will have repeated keys; as a best-effort attempt to prevent such cases, the macro disallows specifying literals or constants as keys
html! {
<div>
for i in (0 .. props.n).rev() {
<h2 key="number" /* nuh-uh */>{ i }</h2>
<br />
}
</div>
}
§match
nodes
The syntax is the same as of Rust’s match
expressions; the body of a match arm must have
exactly 1 node.
use yew::{Properties, function_component, html::Html};
use yew_html_ext::html;
use std::cmp::Ordering;
#[derive(PartialEq, Properties)]
struct ComparisonProps {
int1: usize,
int2: usize,
}
#[function_component]
fn Comparison(props: &ComparisonProps) -> Html {
html! {
match props.int1.cmp(&props.int2) {
Ordering::Less => { '<' },
Ordering::Equal => { '=' },
Ordering::Greater => { '>' },
}
}
}
§let
bindings
Normal Rust’s let
bindings, including let-else
structures, are supported with the same
syntax.
use yew::{Properties, function_component, html::Html};
use yew_html_ext::html;
use std::{fs::read_dir, path::PathBuf};
#[derive(PartialEq, Properties)]
struct DirProps {
path: PathBuf,
}
#[function_component]
fn Dir(props: &DirProps) -> Html {
html! {
<ul>
let Ok(iter) = read_dir(&props.path) else {
return html!("oops :P")
};
for entry in iter {
let Ok(entry) = entry else {
return html!("oops :p")
};
<li>{ format!("{:?}", entry.path()) }</li>
}
</ul>
}
}