75 lines
1.6 KiB
JavaScript
75 lines
1.6 KiB
JavaScript
module.exports = LocationHistory
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function LocationHistory () {
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if (!new.target) return new LocationHistory()
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this._history = []
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this._forward = []
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this._pending = null
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}
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LocationHistory.prototype.go = function (page) {
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console.log('go', page)
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this.clearForward()
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this._go(page)
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}
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LocationHistory.prototype._go = function (page) {
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if (this._pending) return
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if (page.onbeforeload) {
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this._pending = page
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page.onbeforeload((err) => {
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if (this._pending !== page) return /* navigation was cancelled */
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this._pending = null
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if (err) return
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this._history.push(page)
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})
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} else {
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this._history.push(page)
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}
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}
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LocationHistory.prototype.back = function () {
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if (this._history.length <= 1) return
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var page = this._history.pop()
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if (page.onbeforeunload) {
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page.onbeforeunload(() => {
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this._forward.push(page)
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})
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} else {
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this._forward.push(page)
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}
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}
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LocationHistory.prototype.forward = function () {
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if (this._forward.length === 0) return
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var page = this._forward.pop()
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this._go(page)
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}
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LocationHistory.prototype.clearForward = function () {
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this._forward = []
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}
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LocationHistory.prototype.current = function () {
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return this._history[this._history.length - 1]
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}
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LocationHistory.prototype.hasBack = function () {
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return this._history.length > 1
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}
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LocationHistory.prototype.hasForward = function () {
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return this._forward.length > 0
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}
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LocationHistory.prototype.pending = function () {
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return this._pending
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}
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LocationHistory.prototype.clearPending = function () {
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this._pending = null
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}
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