javascript 离子：网络工作者

Posted 2021-05-03

readonly myWorker: Worker = new Worker('./assets/workers/shops.js');
this.allService.myWorker.onmessage = (event) => {
    this.ngZone.run(() => {
        this.allService.subShopItems = event.data.filteredList;
        console.timeEnd('shopsWorker 1: ');
        console.log('shopsWorker 2: ', this.allService.subShopItems);
    })
};
this.allService.myWorker.postMessage({
    command       : 'doFuzzySearch',
    sub_categories: this.rootCategories2[5].sub_categories,
    radius        : this.radius,
    lat2          : this.lat2,
    long2         : this.long2,
});
///////
///////

'use strict';
//import * as nativegeocoder from "../../../plugins/cordova-plugin-nativegeocoder/www/NativeGeocoder";
//self.importScripts("../../../node_modules/@ionic-native/native-geocoder/index.js");
var sub_categories,
    radius,
    lat2,
    long2;
self.onmessage                 = function (event){
    // Receive a message and answer accordingly
    sub_categories = event.data.sub_categories;
    radius         = event.data.radius;
    lat2           = event.data.lat2;
    long2          = event.data.long2;
    self.doFuzzySearch();
};
self.doFuzzySearch             = function (){
    var filteredList = [];
    console.time('shopsWorker: internalFastFilter');
    for (var n = 0; n < sub_categories.length; n++) {
        //console.log('shopsWorker: subShopItems 0: ', n, sub_categories.length, sub_categories, this.radius);
        filteredList[n] = sub_categories[n];
        if (sub_categories[n] && sub_categories[n].sub_categories && sub_categories[n].sub_categories.length > 0) {
            for (var i = 0; i < sub_categories[n].sub_categories.length; i++) {
                //console.log('shopsWorker: subShopItems 1: ', i, self.radius, sub_categories[n].sub_categories[i].latitude,
                // sub_categories[n].sub_categories[i].longitude, self.lat2, self.long2);
                if (sub_categories[n].sub_categories[i].latitude && sub_categories[n].sub_categories[i].latitude.length > 0 && sub_categories[n].sub_categories[i].longitude && sub_categories[n].sub_categories[i].longitude.length > 0) {
                    let km = self.getDistanceFromLatLonInKm(sub_categories[n].sub_categories[i].latitude, sub_categories[n].sub_categories[i].longitude, self.lat2, self.long2);
                    //console.log('shopsWorker: km: ', i, km);
                    if (km < self.radius) {
                        console.log('shopsWorker: TRUE: ', n, i, km, self.radius, sub_categories[n].sub_categories[i].latitude, sub_categories[n].sub_categories[i].longitude, self.lat2, self.long2, filteredList.length, filteredList);
                        filteredList[n].sub_categories[i].shops = true;
                    } else {
                        filteredList[n].sub_categories[i].shops = false;
                    }
                    console.log('shopsWorker: subShopItems 3: ', n, i, km, self.radius, sub_categories[n].sub_categories[i], filteredList.length, filteredList);
                    //console.log('calltocal 2: result: ', i, result);
                    /*var xhr     = new XMLHttpRequest();
                    xhr.open("GET", "https://maps.google.com/maps/api/geocode/json?address=" + address + "&sensor=false&key=AIzaSyCXy_YDP0b8hbEbPHAwfAF_8wu7Ri_75Lo&region=Malaysia");
                    xhr.onload = function (){
                        if (this.status == 200 && xhr.responseText && JSON.parse(xhr.responseText) && JSON.parse(xhr.responseText).results.length > 0) {
                            var coordinates = JSON.parse(xhr.responseText).results[0].geometry.location;
                            console.log('shopsWorker xhr: ', i, coordinates);
                            sub_categories[n].sub_categories[i].lat  = coordinates.lat;
                            sub_categories[n].sub_categories[i].long = coordinates.lng;
                        } else {
                            //send some general error
                            console.error('shopsWorker xhr: ', i);
                        }
                    }
                    xhr.send();*/
                    /*this.nativeGeocoder.forwardGeocode(sub_categories[n].sub_categories[i].address).then((coordinates : NativeGeocoderForwardResult[]) => {
                        sub_categories[n].sub_categories[i].lat  = coordinates[0].latitude;
                        sub_categories[n].sub_categories[i].long = coordinates[0].longitude;
                        console.log('subShopItems 2: ', i, sub_categories[n].sub_categories[i].lat, sub_categories[n].sub_categories[i].long, this.lat2, this.long2);
                        var km = this.getDistanceFromLatLonInKm(sub_categories[n].sub_categories[i].lat, sub_categories[n].sub_categories[i].long, this.lat2, this.long2);
                        //console.log('calltocal 4: km: ', i, km);
                        if (km < this.radius) {
                            filteredList[n].sub_categories[i].shops = true;
                            console.log('subShopItems 3: ', n, i, sub_categories[n].sub_categories[i], filteredList.length, filteredList, km);
                        }
                    })*/
                } else {
                    filteredList[n].sub_categories[i].shops = false;
                }
            }
        }
    }
    console.timeEnd('shopsWorker: internalFastFilter');
    // Send the results back
    postMessage({filteredList : filteredList});
};
self.getDistanceFromLatLonInKm = function (lat1, lon1, lat2, lon2){
    var R    = 6371; // Radius of the earth in km
    var dLat = self.deg2rad(lat2 - lat1);  // deg2rad below
    var dLon = self.deg2rad(lon2 - lon1);
    var a    = Math.sin(dLat / 2) * Math.sin(dLat / 2) + Math.cos(self.deg2rad(lat1)) * Math.cos(self.deg2rad(lat2)) * Math.sin(dLon / 2) * Math.sin(dLon / 2);
    var c    = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
    var d    = R * c; // Distance in km
    return d;
}
self.deg2rad                   = function (deg){
    return deg * (Math.PI / 180)
}