function RemoGeoLocation () {
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this._remoteSvrUrl = 'https://webapi.amap.com/html/geolocate.html'
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this._callbackList = []
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this._seqBase = 1
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this._frameReady = 0
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this._watchIdMap = {}
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}
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RemoGeoLocation.prototype = {
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_getSeq: function () {
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return this._seqBase++
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},
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_onRrameReady: function (callback) {
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if (this._frameReady === 0) {
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if (!this._frameReadyList) {
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this._frameReadyList = []
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}
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this._frameReadyList.push(callback)
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this._prepareIframe()
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return
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}
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callback.call(this)
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},
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_prepareIframe: function () {
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if (this._iframeWin) {
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return
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}
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var ifrm = document.createElement('iframe')
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ifrm.src =
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this._remoteSvrUrl + (this._remoteSvrUrl.indexOf('?') > 0 ? '&' : '?')
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ifrm.width = '0px'
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ifrm.height = '0px'
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ifrm.style.position = 'absolute'
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ifrm.style.display = 'none'
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var self = this
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var timeoutId = setTimeout(function () {
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self._frameReady = false
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self._callbackFrameReadyList()
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}, 5000)
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ifrm.onload = function () {
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clearTimeout(timeoutId)
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self._frameReady = true
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self._callbackFrameReadyList()
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ifrm.onload = null
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}
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document.body.appendChild(ifrm)
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this._iframeWin = ifrm.contentWindow
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window.addEventListener(
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'message',
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function (e) {
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if (self._remoteSvrUrl.indexOf(e.origin) !== 0) {
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return
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}
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self._handleRemoteMsg(e.data)
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},
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false
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)
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},
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_callbackFrameReadyList: function () {
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if (this._frameReadyList) {
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var list = this._frameReadyList
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this._frameReadyList = null
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for (var i = 0, len = list.length; i < len; i++) {
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list[i].call(this, this._frameReady)
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}
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}
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},
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_pickCallback: function (seqNum, keepInList) {
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var callbackList = this._callbackList
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for (var i = 0, len = callbackList.length; i < len; i++) {
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var cbkInfo = callbackList[i]
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if (seqNum === cbkInfo.seq) {
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if (!keepInList) {
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callbackList.splice(i, 1)
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}
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return cbkInfo
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}
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}
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},
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_handleRemoteMsg: function (msg) {
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var seqNum = msg.seq
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var cbkInfo = this._pickCallback(seqNum, !!msg.notify)
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if (cbkInfo) {
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cbkInfo.cbk.call(null, msg.error, msg.result)
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} else {
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console.warn('Receive remote msg: ', msg)
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}
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},
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_postMessage: function (cmd, args, callback, seq) {
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this._prepareIframe()
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var msg = {
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cmd: cmd,
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args: args,
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seq: seq || this._getSeq()
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}
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this._callbackList.push({
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cbk: callback,
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seq: msg.seq
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})
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this._onRrameReady(function () {
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if (this._frameReady === true) {
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try {
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this._iframeWin.postMessage(msg, '*')
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} catch (e) {
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this._pickCallback(msg.seq)
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callback(e)
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}
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} else {
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this._pickCallback(msg.seq)
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callback({
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message: 'iFrame load failed!'
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})
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}
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})
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},
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getCurrentPosition: function (succHandler, errHandler, options) {
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this._postMessage('getCurrentPosition', [options], function (err, result) {
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if (err) {
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if (errHandler) {
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errHandler(err)
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}
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return
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}
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if (succHandler) {
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succHandler(result)
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}
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})
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},
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watchPosition: function (succHandler, errHandler, options) {
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var watchKey = 'wk' + this._getSeq()
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var cmdSeq = this._getSeq()
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this._watchIdMap[watchKey] = {
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stat: 0,
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seq: cmdSeq
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}
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var self = this
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this._postMessage(
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'watchPosition',
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[options],
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function (err, result) {
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var id = null
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if (result) {
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id = result.id
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}
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var watchInfo = self._watchIdMap[watchKey]
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watchInfo.id = id
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watchInfo.stat = 1
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if (watchInfo.callbackList) {
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var list = watchInfo.callbackList
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watchInfo.callbackList = null
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for (var i = 0, len = list.length; i < len; i++) {
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list[i].call(self, id)
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}
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}
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if (err) {
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if (errHandler) {
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errHandler(err)
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}
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return
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}
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if (succHandler) {
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succHandler(result.pos)
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}
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},
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cmdSeq
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)
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return watchKey
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},
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clearWatch: function (watchKey, callback) {
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if (!this._watchIdMap[watchKey]) {
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callback('Id not exists: ' + watchKey)
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return
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}
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var watchInfo = this._watchIdMap[watchKey]
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var self = this
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function clearId (id) {
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self._postMessage('clearWatch', [id], function (err, result) {
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if (!err) {
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self._pickCallback(watchInfo.seq)
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delete self._watchIdMap[watchKey]
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}
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if (callback) {
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callback(err, result)
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}
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})
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}
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if (watchInfo.stat < 1) {
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if (!watchInfo.callbackList) {
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watchInfo.callbackList = []
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}
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watchInfo.callbackList.push(function (id) {
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clearId(id)
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})
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} else {
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clearId(watchInfo.id)
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}
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}
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}
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export default RemoGeoLocation
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