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transition-manager.js
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transition-manager.js
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"use strict";
function TransitionManager(callbacks) {
callbacks = callbacks || {};
this._request = null;
this._onTransitionStart = callbacks.startTransition || null;
this._onTransitionProgress = callbacks.progressTransition || null;
this._onTransitionEnd = callbacks.stopTransition || null;
this._onPage = callbacks.displayPage || null;
this._onError = callbacks.displayError || null;
window.onpopstate = (e) => this.performTransition(e.state);
}
TransitionManager.prototype.urlIsSuitableForTransition = function(candidate) {
var target = new URL(candidate);
var source = window.location;
return target.origin === source.origin;
};
TransitionManager.prototype.endTransition = function() {
this._request = null;
if (this._onTransitionEnd instanceof Function) {
this._onTransitionEnd({});
}
};
TransitionManager.prototype.cancelTransition = function() {
if (!this.isTransitioning()) return;
console.assert(this._request !== null);
this._request.abort();
this._request = null;
if (this._onTransitionEnd instanceof Function) {
this._onTransitionEnd({});
}
};
TransitionManager.prototype.isTransitioning = function() {
return this._request !== null;
};
TransitionManager.prototype.transitionTo = function(target) {
var state = { target: target };
history.pushState(state, "", target);
this.performTransition(state);
};
TransitionManager.prototype.performTransition = function(state) {
var target = state.target;
if (this.isTransitioning()) this.cancelTransition();
if (this._onTransitionStart instanceof Function) {
this._onTransitionStart({});
}
this._request = new XMLHttpRequest();
this._request.open("GET", target, true);
this._request.onerror = e => {
this.handleError(
this._request.status,
this._request.response,
this._request.statusText
);
};
this._request.upload.onprogress = e => {
var progress = e.lengthComputable ? e.loaded / e.total : 1;
if (this._onTransitionProgress instanceof Function) {
this._onTransitionProgress({
progress: Math.min(0.5, progress / 2)
});
}
};
this._request.onprogress = e => {
var progress = e.lengthComputable ? e.loaded / e.total : 1;
if (this._onTransitionProgress instanceof Function) {
this._onTransitionProgress({
progress: 0.5 + Math.min(0.5, progress / 2)
});
}
};
this._request.onload = e => {
var request = this._request;
this.endTransition();
var status = request.status;
if (status < 200 || 300 <= status) {
this.handleError(
request.status,
request.response,
request.statusText
);
return;
}
var dom = document.createElement("template");
dom.innerHTML = request.response;
this.handlePage(dom.content);
};
this._request.send();
};
TransitionManager.prototype.handlePage = function(response) {
if (this._onPage instanceof Function) {
this._onPage(response);
}
};
TransitionManager.prototype.handleError = function(code, response, statusText) {
if (this._onError instanceof Function) {
this._onError({
code: code,
response: response,
statusText: statusText
});
}
};
window.TransitionManager = TransitionManager;