184 lines
3.9 KiB
TypeScript
Raw Normal View History

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import { Diff } from "./Diff"
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class LoadOptions {
addToHistory?: boolean
forceReload?: boolean
}
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export class Application {
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ajaxClass: string
fadeOutClass: string
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activeLinkClass: string
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content: HTMLElement
loading: HTMLElement
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currentPath: string
originalPath: string
lastRequest: XMLHttpRequest | null
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constructor() {
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this.currentPath = window.location.pathname
this.originalPath = window.location.pathname
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this.ajaxClass = "ajax"
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this.activeLinkClass = "active"
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this.fadeOutClass = "fade-out"
}
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init() {
document.addEventListener("DOMContentLoaded", () => {
this.ajaxify()
this.markActiveLinks()
})
}
find(id: string): HTMLElement | null {
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return document.getElementById(id)
}
get(url: string): Promise<string> {
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if(this.lastRequest) {
this.lastRequest.abort()
this.lastRequest = null
}
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return new Promise((resolve, reject) => {
let request = new XMLHttpRequest()
request.onerror = () => reject(new Error("You are either offline or the requested page doesn't exist."))
request.ontimeout = () => reject(new Error("The page took too much time to respond."))
request.onload = () => {
if(request.status < 200 || request.status >= 400)
reject(request.responseText)
else
resolve(request.responseText)
}
request.open("GET", url, true)
request.send()
this.lastRequest = request
})
}
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load(url: string, options?: LoadOptions) {
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// Start sending a network request
let request = this.get("/_" + url).catch(error => error)
// Parse options
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if(!options) {
options = new LoadOptions()
}
if(options.addToHistory === undefined) {
options.addToHistory = true
}
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// Set current path
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this.currentPath = url
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// Add to browser history
if(options.addToHistory) {
history.pushState(url, "", url)
}
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let onTransitionEnd = (e: Event) => {
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// Ignore transitions of child elements.
// We only care about the transition event on the content element.
if(e.target !== this.content) {
return
}
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// Remove listener after we finally got the correct event.
this.content.removeEventListener("transitionend", onTransitionEnd)
// Wait for the network request to end.
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request.then(html => {
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// Set content
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this.setContent(html)
this.scrollToTop()
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// Fade animations
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this.content.classList.remove(this.fadeOutClass)
this.loading.classList.add(this.fadeOutClass)
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// Send DOMContentLoaded Event
this.emit("DOMContentLoaded")
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})
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}
this.content.addEventListener("transitionend", onTransitionEnd)
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this.content.classList.add(this.fadeOutClass)
this.loading.classList.remove(this.fadeOutClass)
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this.markActiveLinks()
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return request
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}
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setContent(html: string) {
this.content.innerHTML = html
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}
markActiveLinks(element?: HTMLElement) {
if(!element) {
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element = document.body
}
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let links = element.getElementsByTagName("a")
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for(let i = 0; i < links.length; i++) {
let link = links[i]
let href = link.getAttribute("href")
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if(href === this.currentPath)
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link.classList.add(this.activeLinkClass)
else
link.classList.remove(this.activeLinkClass)
}
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}
ajaxify(element?: HTMLElement) {
if(!element) {
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element = document.body
}
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let links = element.querySelectorAll("." + this.ajaxClass)
for(let i = 0; i < links.length; i++) {
let link = links[i] as HTMLElement
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// link.classList.remove(this.ajaxClass)
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let self = this
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link.onclick = function(e) {
// Middle mouse button should have standard behaviour
if(e.which === 2)
return
let url = this.getAttribute("href")
e.preventDefault()
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if(!url || url === self.currentPath)
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return
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// Load requested page
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self.load(url)
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}
}
}
scrollToTop() {
let parent : HTMLElement | null = this.content
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while(parent = parent.parentElement) {
parent.scrollTop = 0
}
}
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emit(eventName: string) {
document.dispatchEvent(new Event(eventName, {
"bubbles": true,
"cancelable": true
}))
}
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}