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38 lines
902 B
38 lines
902 B
function OpenStreetBrowserLoader () {
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this.types = {}
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}
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OpenStreetBrowserLoader.prototype.load = function (id, callback) {
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function reqListener (req) {
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if (req.status !== 200) {
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console.log(req)
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return callback(req.statusText, null)
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}
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var data = JSON.parse(req.responseText)
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if (!data.type) {
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callback('no type defined', null)
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return
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} else if (!(data.type in this.types)) {
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callback('unknown type', null)
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return
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} else {
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var layer = new this.types[data.type](id, data)
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}
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callback(null, layer)
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}
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var req = new XMLHttpRequest()
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req.addEventListener("load", reqListener.bind(this, req))
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req.open("GET", "categories/" + id + ".json")
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req.send()
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}
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OpenStreetBrowserLoader.prototype.registerType = function (type, classObject) {
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this.types[type] = classObject
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}
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module.exports = new OpenStreetBrowserLoader()
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