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only preload once - fixes #49

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This commit is contained in:
Rich Harris
2017-12-25 18:06:27 -05:00
parent 4c343490d2
commit 502dd547d1
2 changed files with 55 additions and 35 deletions
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1
package.json
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@@ -42,6 +42,7 @@
"scripts": {
"cy:open": "cypress open",
"test": "mocha --opts mocha.opts",
"pretest": "npm run build",
"build": "rollup -c",
"dev": "rollup -cw"
},

89
src/runtime/index.ts
View File

@@ -37,38 +37,43 @@ function select_route(url: URL): { route: Route, data: RouteData } {
let current_token: {};
function render(Component: ComponentConstructor, data: { query: Query, params: Params }, scroll: ScrollPosition, token: {}) {
Promise.resolve(
function render(Component: ComponentConstructor, data: any, scroll: ScrollPosition, token: {}) {
if (current_token !== token) return;
if (component) {
component.destroy();
} else {
// first load — remove SSR'd <head> contents
const start = document.querySelector('#sapper-head-start');
const end = document.querySelector('#sapper-head-end');
if (start && end) {
while (start.nextSibling !== end) detach(start.nextSibling);
detach(start);
detach(end);
}
// preload additional routes
routes.reduce((promise: Promise<any>, route) => promise.then(route.load), Promise.resolve());
}
component = new Component({
target,
data,
hydrate: !!component
});
if (scroll) {
window.scrollTo(scroll.x, scroll.y);
}
}
function prepare_route(Component, data) {
return Promise.resolve(
Component.preload ? Component.preload(data) : {}
).then(preloaded => {
if (current_token !== token) return;
if (component) {
component.destroy();
} else {
// first load — remove SSR'd <head> contents
const start = document.querySelector('#sapper-head-start');
const end = document.querySelector('#sapper-head-end');
if (start && end) {
while (start.nextSibling !== end) detach(start.nextSibling);
detach(start);
detach(end);
}
// preload additional routes
routes.reduce((promise: Promise<any>, route) => promise.then(route.load), Promise.resolve());
}
component = new Component({
target,
data: Object.assign(data, preloaded),
hydrate: !!component
});
if (scroll) {
window.scrollTo(scroll.x, scroll.y);
}
Object.assign(data, preloaded)
return { Component, data };
});
}
@@ -86,8 +91,16 @@ function navigate(url: URL, id: number) {
scroll_history[cid] = { x: 0, y: 0 };
}
selected.route.load().then(mod => {
render(mod.default, selected.data, scroll_history[id], current_token = {});
const loaded = prefetching && prefetching.href === url.href ?
prefetching.promise :
selected.route.load().then(mod => prepare_route(mod.default, selected.data));
prefetching = null;
const token = current_token = {};
loaded.then(({ Component, data }) => {
render(Component, data, scroll_history[id], token);
});
cid = id;
@@ -146,6 +159,11 @@ function handle_popstate(event: PopStateEvent) {
}
}
let prefetching: {
href: string;
promise: Promise<{ Component: ComponentConstructor, data: any }>;
} = null;
function prefetch(event: MouseEvent | TouchEvent) {
const a: HTMLAnchorElement = <HTMLAnchorElement>findAnchor(<Node>event.target);
if (!a || a.rel !== 'prefetch') return;
@@ -153,9 +171,10 @@ function prefetch(event: MouseEvent | TouchEvent) {
const selected = select_route(new URL(a.href));
if (selected) {
selected.route.load().then(mod => {
if (mod.default.preload) mod.default.preload(selected.data);
});
prefetching = {
href: a.href,
promise: selected.route.load().then(mod => prepare_route(mod.default, selected.data))
};
}
}