Я извлекаю данные из MySQL на веб-страницу и не вижу, когда застрял в цикле while.
Для фона я извлекаю данные из базы данных и пытаюсь поместить их в объекты, которыевыглядит примерно так:
var SawtoothPassTrailhead = {
name: "Sawtooth Pass Trailhead",
lat: 36.453165,
long: -118.596751,
type: "backpacking",
//Title then link
seekAdventure: [],
blogs: ['Mineral King Loop – Sequoia National Park (45 Mile Loop) - Backpackers Review' , 'https://backpackers-review.com/trip-reports/sequoia-mineral-king/'],
youtTube: []
};
Данные JSON, которые возвращаются из моего вызова БД для моего теста, выглядят так:
[
{"TrailHeadID":"1",
"TrailHeadName":"Tanner Trail - Grand Canyon",
"TrailHeadLat":"36.03260",
"TrailHeadLong":"-111.85250",
"GuideTitle":"1 Week Traversing the Grand Canyon",
"GuideLink":"https:\/\/www.seekadventure.net\/d\/94-1-week-traversing-the-grand-canyon",
"GuideMediaType":"SeekAdventure"
},{
"TrailHeadID":"2",
"TrailHeadName":"Badger Pass - Yosemite",
"TrailHeadLat":"37.66480",
"TrailHeadLong":"-119.66340",
"GuideTitle":"22 Hours of Driving, 1.5 Days of Snowshoeing, Yosemite National Park",
"GuideLink":"https:\/\/www.seekadventure.net\/d\/79-22-hours-of-driving-1-5-days-of-snowshoeing-yosemite-nationa",
"GuideMediaType":"SeekAdventure"
},{
"TrailHeadID":"2",
"TrailHeadName":"Badger Pass - Yosemite",
"TrailHeadLat":"37.66480",
"TrailHeadLong":"-119.66340",
"GuideTitle":"Snowshoeing to Dewey Point in Yosemite (Socal Hike)r",
"GuideLink":"https:\/\/socalhiker.net\/snowshoeing-to-dewey-point-in-yosemite\/",
"GuideMediaType":"blog"
},{
"TrailHeadID":"3",
"TrailHeadName":"Descanso Beach - Catalina",
"TrailHeadLat":"33.35040",
"TrailHeadLong":"-118.32820",
"GuideTitle":"Kayak Camping Catalina Island",
"GuideLink":"https:\/\/www.seekadventure.net\/d\/76-kayak-camping-catalina-island",
"GuideMediaType":"SeekAdventure"
},{
"TrailHeadID":"4",
"TrailHeadName":"Trans Catalina Trail",
"TrailHeadLat":"33.34030",
"TrailHeadLong":"-118.32620",
"GuideTitle":"Mini Trans Catalina Trail",
"GuideLink":"https:\/\/www.seekadventure.net\/d\/73-mini-trans-catalina-trip",
"GuideMediaType":"SeekAdventure"
},{
"TrailHeadID":"4",
"TrailHeadName":"Trans Catalina Trail",
"TrailHeadLat":"33.34030",
"TrailHeadLong":"-118.32620",
"GuideTitle":"Backpacking the Trans-Catalina Trail (Bearfoot Theory)",
"GuideLink":"https:\/\/bearfoottheory.com\/backpacking-the-trans-catalina-trail\/",
"GuideMediaType":"blog"
},{
"TrailHeadID":"5",
"TrailHeadName":"High Sierra Trail",
"TrailHeadLat":"36.55470",
"TrailHeadLong":"-118.74890",
"GuideTitle":"High Sierra Trail Complete Guide",
"GuideLink":"https:\/\/www.seekadventure.net\/d\/22-california-high-sierra-trail-to-mt-whitney'",
"GuideMediaType":"SeekAdventure"
},{
"TrailHeadID":"5",
"TrailHeadName":"High Sierra Trail",
"TrailHeadLat":"36.55470",
"TrailHeadLong":"-118.74890",
"GuideTitle":"High Sierra Trail (SoCal Hiker)",
"GuideLink":"https:\/\/socalhiker.net\/overview-of-the-high-sierra-trail\/",
"GuideMediaType":"blog"
},{
"TrailHeadID":"6",
"TrailHeadName":"Deer Springs Trail - San Jacinto",
"TrailHeadLat":"33.75300",
"TrailHeadLong":"-116.72270",
"GuideTitle":"Deer Springs Trail",
"GuideLink":"https:\/\/www.seekadventure.net\/d\/26-california-deer-springs-trail-san-jacinto-mountain",
"GuideMediaType":"SeekAdventure"
},{
"TrailHeadID":"7",
"TrailHeadName":"Reflection Canyon",
"TrailHeadLat":"37.25220",
"TrailHeadLong":"-110.97350",
"GuideTitle":"Reflection Canyon",
"GuideLink":"https:\/\/www.seekadventure.net\/d\/24-utah-photographing-reflection-canyon",
"GuideMediaType":"SeekAdventure"
},{
"TrailHeadID":"7",
"TrailHeadName":"Reflection Canyon",
"TrailHeadLat":"37.25220",
"TrailHeadLong":"-110.97350",
"GuideTitle":"Reflection Canyon Backpacking Guide (Clever Hiker)",
"GuideLink":"https:\/\/www.cleverhiker.com\/blog\/reflection-canyon-backpacking-guide",
"GuideMediaType":"blog"
},{
"TrailHeadID":"8",
"TrailHeadName":"Big Pine Lakes - North Fork Trail",
"TrailHeadLat":"37.12820",
"TrailHeadLong":"-118.42770",
"GuideTitle":"North Fork to 2nd Lake Sierra Nevada in a Snow Storm",
"GuideLink":"https:\/\/www.seekadventure.net\/d\/18-california-north-fork-to-2nd-lake-sierra-nevada-in-a-snow-storm",
"GuideMediaType":"SeekAdventure"
},{
"TrailHeadID":"8",
"TrailHeadName":"Big Pine Lakes - North Fork Trail",
"TrailHeadLat":"37.12820",
"TrailHeadLong":"-118.42770",
"GuideTitle":"Hiking To Big Pine Lakes via The North Fork Trail (Trail to Peak)",
"GuideLink":"https:\/\/trailtopeak.com\/2017\/07\/09\/hiking-to-big-pine-lakes-via-the-north-fork-trail\/",
"GuideMediaType":"blog"
},{
"TrailHeadID":"9",
"TrailHeadName":"Fish Creek Wash Anza Borrego",
"TrailHeadLat":"33.03872",
"TrailHeadLong":"-116.09941",
"GuideTitle":"Jeeping in Fish Creek Wash Anza Borrego","GuideLink":"https:\/\/www.seekadventure.net\/d\/99-jeeping-in-fish-creek-wash-anza-borrego",
"GuideMediaType":"SeekAdventure"
}]
Проблема в том, что массив объектов работает в жестком кодехорошо, но когда я переключаюсь на мой загруженный массив объектов JSON, я просто получаю пустую карту.Вот мой код, и я могу указать на мое устранение неполадок:
var gmarkers1 = [];
var markers1 = [];
var markerCluster;
var infowindow;
var lastmarker = null;
var xmlhttp = new XMLHttpRequest();
var url = "getMyJSON.php";
var SawtoothPassTrailhead = {
name: "Sawtooth Pass Trailhead",
lat: 36.453165,
long: -118.596751,
type: "backpacking",
//Title then link
seekAdventure: [],
blogs: ['Mineral King Loop – Sequoia National Park (45 Mile Loop) - Backpackers Review' , 'https://backpackers-review.com/trip-reports/sequoia-mineral-king/'],
youtTube: []
};
//Call PHP file and get JSON
xmlhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
myFunction(this.responseText);
}
}
xmlhttp.open("GET", url, true);
xmlhttp.send();
var markers2 = new Array();
function myFunction(response) {
var arr = JSON.parse(response);
var i;
var localTrailHeadID;
var trailHeadCounter = 0;
var TrailHeadObject;
var lastTrailHeadID = 0;
//set array conts all to zero
var seekAdventureCount;
var blogsCount;
var youtubeCount;
var j = 0;
//for each row returned by mySQL
for(i = 0; i < arr.length; i++){
localTrailHeadID = arr[i].TrailHeadID;
//if previuse trailhead is the same as the current trail head get info and add to correct array
if (localTrailHeadID == lastTrailHeadID){
if(arr[i].GuideMediaType == "SeekAdventure"){
TrailHeadObject.seekAdventureGuideList[seekAdventureCount] = arr[i].GuideTitle;
console.log(arr[i].GuideTitle);
seekAdventureCount = seekAdventureCount + 1;
TrailHeadObject.seekAdventureGuideList[seekAdventureCount] = arr[i].GuideLink;
seekAdventureCount = seekAdventureCount + 1;
}
if(arr[i].GuideMediaType == "blog"){
TrailHeadObject.blogGuideList[blogsCount] = arr[i].GuideTitle;
console.log(arr[i].GuideTitle);
blogsCount = blogsCount + 1;
TrailHeadObject.blogGuideList[blogsCount] = arr[i].GuideLink;
blogsCount = blogsCount + 1;
}
if(arr[i].GuideMediaType == "YouTube"){
TrailHeadObject.youTubegGuideList[youtubeCount] = arr[i].GuideTitle;
console.log(arr[i].GuideTitle);
youtubeCount = youtubeCount + 1;
TrailHeadObject.youTubegGuideList[youtubeCount] = arr[i].GuideLink;
youtubeCount = youtubeCount + 1;
}
}
//create new object and then add guide to correct array
else{
//add object to array of markers except on first round
if(j == 0){
j = j + 1;
}
else{
markers1[trailHeadCounter] = TrailHeadObject;
console.log(trailHeadCounter);
trailHeadCounter = trailHeadCounter + 1;
}
//create new trailhead object
TrailHeadObject = new Object();
//set array counters to zero
var seekAdventureCount =0;
var blogsCount = 0;
var youtubeCount = 0;
//set name lat and long
TrailHeadObject.name = arr[i].TrailHeadName;
console.log(arr[i].TrailHeadName);
TrailHeadObject.lat = arr[i].TrailHeadLat;
TrailHeadObject.long = arr[i].TrailHeadLong;
//set TrailHeadObject Guide arrays to empty
TrailHeadObject.seekAdventureGuideList = [];
TrailHeadObject.blogGuideList = [];
TrailHeadObject.youTubegGuideList = [];
//Add trail Guide
//check first guide media type and add to correct Array
if(arr[i].GuideMediaType == "SeekAdventure"){
TrailHeadObject.seekAdventureGuideList[seekAdventureCount] = arr[i].GuideTitle;
console.log(arr[i].GuideTitle);
seekAdventureCount = seekAdventureCount + 1;
TrailHeadObject.seekAdventureGuideList[seekAdventureCount] = arr[i].GuideLink;
seekAdventureCount = seekAdventureCount + 1;
}
if(arr[i].GuideMediaType == "blog"){
TrailHeadObject.blogGuideList[blogsCount] = arr[i].GuideTitle;
console.log(arr[i].GuideTitle);
blogsCount = blogsCount + 1;
TrailHeadObject.blogGuideList[blogsCount] = arr[i].GuideLink;
blogsCount = blogsCount + 1;
}
if(arr[i].GuideMediaType == "YouTube"){
TrailHeadObject.youTubegGuideList[youtubeCount] = arr[i].GuideTitle;
console.log(arr[i].GuideTitle);
youtubeCount = youtubeCount + 1;
TrailHeadObject.youTubegGuideList[youtubeCount] = arr[i].GuideLink;
youtubeCount = youtubeCount + 1;
}
} // end else statement
//set last trailhead ID
lastTrailHeadID = localTrailHeadID;
}//end for Loop
} //end my function
//markers1[trailHeadCounter+1] = TrailHeadObject;
//console.log(markers1[trailHeadCounter+1].name);
//testing
//console.log(markers1[0].name);
//console.log(markers1[0].long);
//console.log(markers1[0].lat);
//Proceses JSON Info and build Objects and place into markers1 arrray
///////////////////////////////
//add Hike Objects to Array////
///////////////////////////////
//markers1 = [
//SawtoothPassTrailhead
//];
/**
* Function to init map
*/
// Before we go looking for the passed parameters, set some defaults
// in case there are no parameters
var id;
var index = -1;
//set initial map values
var lat = 40.534900;
var lng = -101.343789;
var zoom = 4;
// If there are any parameters at eh end of the URL, they will be in location.search
// looking something like "?marker=3"
// skip the first character, we are not interested in the "?"
var query = location.search.substring(1);
// split the rest at each "&" character to give a list of "argname=value" pairs
var pairs = query.split("&");
for (var i = 0; i < pairs.length; i++) {
// break each pair at the first "=" to obtain the argname and value
var pos = pairs[i].indexOf("=");
var argname = pairs[i].substring(0, pos).toLowerCase();
var value = pairs[i].substring(pos + 1).toLowerCase();
// process each possible argname - use unescape() if theres any chance of spaces
if (argname == "id") {
id = unescape(value);
}
if (argname == "marker") {
index = parseFloat(value);
}
if (argname == "lat") {
lat = parseFloat(value);
}
if (argname == "lng") {
lng = parseFloat(value);
}
if (argname == "zoom") {
zoom = parseInt(value);
}
if (argname == "type") {
// from the v3 documentation 8/24/2010
// HYBRID This map type displays a transparent layer of major streets on satellite images.
// ROADMAP This map type displays a normal street map.
// SATELLITE This map type displays satellite images.
// TERRAIN This map type displays maps with physical features such as terrain and vegetation.
if (value == "m") {
maptype = google.maps.MapTypeId.ROADMAP;
}
if (value == "k") {
maptype = google.maps.MapTypeId.SATELLITE;
}
if (value == "h") {
maptype = google.maps.MapTypeId.HYBRID;
}
if (value == "t") {
maptype = google.maps.MapTypeId.TERRAIN;
}
}
}
function makeLink() {
var mapinfo = "lat=" + map.getCenter().lat().toFixed(6) +
"&lng=" + map.getCenter().lng().toFixed(6) +
"&zoom=" + map.getZoom() +
"&type=" + MapTypeId2UrlValue(map.getMapTypeId());
if (lastmarker) {
var a = "https://www.seekadventure.net/adventureMap.html?id=" + lastmarker.id + "&" + mapinfo;
var b = "https://www.seekadventure.net/adventureMap.html?marker=" + lastmarker.index + "&" + mapinfo;
} else {
var a = "https://www.seekadventure.net/adventureMap.html?" + mapinfo;
var b = a;
}
document.getElementById("idlink").innerHTML = '<a href="' + a + '" id=url target=_new>Share Current Map View</a>';
}
function MapTypeId2UrlValue(maptype) {
var urlValue = 'm';
switch (maptype) {
case google.maps.MapTypeId.HYBRID:
urlValue = 'h';
break;
case google.maps.MapTypeId.SATELLITE:
urlValue = 'k';
break;
case google.maps.MapTypeId.TERRAIN:
urlValue = 't';
break;
default:
case google.maps.MapTypeId.ROADMAP:
urlValue = 'm';
break;
}
return urlValue;
}
//----------------------------------------------------------
//initialize map
function initialize() {
var center = new google.maps.LatLng(lat, lng);
var mapOptions = {
zoom: zoom,
center: center,
mapTypeId: google.maps.MapTypeId.TERRAIN
};
map = new google.maps.Map(document.getElementById('map-canvas'), mapOptions);
for (i = 0; i < markers1.length; i++) {
console.log("inside new google map");
console.log(markers1[i].name);
addMarker(markers1[i]);
}
infowindow = new google.maps.InfoWindow({
content: ''
});
markerCluster = new MarkerClusterer(map, gmarkers1, {
imagePath: 'https://cdn.rawgit.com/googlemaps/v3-utility-library/master/markerclustererplus/images/m'
});
// Make the link the first time when the page opens
lastmarker = null;
makeLink();
// Make the link again whenever the map changes
google.maps.event.addListener(map, 'maptypeid_changed', makeLink);
google.maps.event.addListener(map, 'center_changed', makeLink);
google.maps.event.addListener(map, 'bounds_changed', makeLink);
google.maps.event.addListener(map, 'zoom_changed', makeLink);
google.maps.event.addListener(map, 'click', function() {
lastmarker = null;
makeLink();
infowindow.close();
});
}
/**
* Function to add marker to map
*/
function addMarker(marker) {
var category = marker.type;
var title = marker.name;
var pos = new google.maps.LatLng(marker.lat, marker.long);
var content = BuildBubbleHTML(marker);
marker1 = new google.maps.Marker({
title: title,
position: pos,
category: category,
map: map
});
gmarkers1.push(marker1);
// Marker click listener
google.maps.event.addListener(marker1, 'click', (function(marker1, content) {
return function() {
infowindow.setContent(content);
infowindow.open(map, marker1);
map.panTo(this.getPosition());
//map.setZoom(15);
}
})(marker1, content));
}
/**
* Function to filter markers by category
*/
filterMarkers = function(category) {
var newmarkers = [];
for (i = 0; i < markers1.length; i++) {
marker = gmarkers1[i];
// If is same category or category not picked
if (marker.category == category || category.length === 0) {
marker.setVisible(true);
newmarkers.push(marker);
}
// Categories don't match
else {
marker.setVisible(false);
}
}
markerCluster.clearMarkers();
markerCluster.addMarkers(newmarkers);
}
//google.maps.event.addDomListener(window, "load", initialize);
/////////////////////////
///Functions For Links///
/////////////////////////
//put pop up bubble html together
function BuildBubbleHTML(hike){
html = "";
html = html +'<h6>' + hike.name + '</h6>';
//If Seek Adventure Links Exist
if(hike.seekAdventure.length > 0){
seekAdventureHTML = '<p>Seek Adventure Links</p>';
seekAdventureHTML = seekAdventureHTML + '<ul>'
var i;
for (i = 0; i < hike.seekAdventure.length; i+=2) {
seekAdventureHTML = seekAdventureHTML + '<li>';
seekAdventureHTML = seekAdventureHTML + '<a href="' + hike.seekAdventure[i+1] + '"target="_blank">';
seekAdventureHTML = seekAdventureHTML + hike.seekAdventure[i] + '</a></li>';
}
seekAdventureHTML = seekAdventureHTML + '</ul>';
html = html + seekAdventureHTML;
}
//If Blog Links Exist
if(hike.blogs.length > 0){
blogHTML = '<p>Blog Links</p>';
blogHTML = blogHTML + '<ul>'
var i;
for (i = 0; i < hike.blogs.length; i+=2) {
blogHTML = blogHTML + '<li>';
blogHTML = blogHTML + '<a href="' + hike.blogs[i+1] + '""target="_blank">';
blogHTML = blogHTML + hike.blogs[i] + '</a></li>';
}
blogHTML = blogHTML + '</ul>';
html = html + blogHTML;
}
return html;
};
Действительно странная часть для меня - я помещаю этот журнал прямо перед вызовом функции маркера:
console.log("inside new google map");
console.log(markers1[i].name);
И я не вижу этого вывода в консоли ... Но если я раскомментирую эту строку:
//markers1 = [
//SawtoothPassTrailhead
//];
, тогда один маркер, который я жестко закодировал, будет загружен в мою карту Google.Я не вижу никаких ошибок в этой точке, поэтому я немного застрял.