是否可以从 $.ajax 调用返回一个变量，更具体地说是一个值数组或字符串。我目前知道这是无法做到的......即需要立即将 $.ajax 响应添加到 DOM 中。如果我在这里遗漏了一些明显的东西，请纠正我。
var infoWindow;
var tableID = 'atableID';
var str;
var beachID;
var beach_location;
var beach_region;
/* start map initialization */
function initialize() {
latlng = new google.maps.LatLng(49.894634, -97.119141);
var myOptions = {
center: latlng,
zoom: 7,
mapTypeId: google.maps.MapTypeId.ROADMAP,
zoomControlOptions: {
style: google.maps.ZoomControlStyle.SMALL
},
mapTypeControl: true,
mapTypeControlOptions: {
mapTypeIds: [
google.maps.MapTypeId.ROADMAP,
google.maps.MapTypeId.SATELLITE,
google.maps.MapTypeId.HYBRID,
google.maps.MapTypeId.TERRAIN
],
style: google.maps.MapTypeControlStyle.DROPDOWN_MENU
},
overviewMapControl: true,
overviewMapControlOptions: {
opened: true
}
};
map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
layer = new google.maps.FusionTablesLayer({
query: {
select: 'Point',
from: atableID
},
suppressInfoWindows: true
});
layer.setMap(map);
infoWindow = new google.maps.InfoWindow();
google.maps.event.addListener(layer, 'click', function (e) {
// close infoWindow if open
if (infoWindow) {
infoWindow.close();
}
beachID = e.row['Beach_ID'].value;
beach_location = e.row['Beach_Location'].value; ;
beach_region = e.row['Beach_Region'].value;;
//console.log(beachID);
// get data set
getEcoliData(beachID,beach_location,beach_region);
getAlgaeData(beachID,beach_location,beach_region);
}); // end google.maps.addListener
} // end map initialization
function getEcoliData(beachID,beach_location,beach_region) {
//local namespace
var rows = [];
var ecoliTable;
var items = [];
var queryURL = "https://www.googleapis.com/fusiontables/v1/query?sql=";
var queryTail = '&key=a key value=?';
var whereClause = "WHERE 'Beach_ID' = " + beachID;
var query = "SELECT 'Sample_Date', 'Average_E._coli_Density','Recreational_Water_Quality_Guideline' FROM atblid " + whereClause + " ORDER BY 'Sample_Date' DESC";
var queryText = encodeURI(query);
$.ajax({
type: "GET",
url: queryURL + queryText + queryTail,
cache: false,
dataType: 'jsonp',
success: function (data) {
rows = data.rows;
// empty table
//$('#content_placeholder').empty();
//$('.ecoli_table').remove();
$('#ecoli_heading').empty();
$('#content_placeholder').prepend('<h6 id="ecoli_heading">E.Coli Data</h6>')
.append('<p>' + beach_location + '</p>').append('<p>' + beach_region + '</p>');
$('.ecoli_table').append('<tr>'
+ '<th>Sample Date</th>'
+ '<th>Average E.Coli Density</th>'
+ '<th>Recreational Water Quality Guideline</th>'
+ '</tr>');
for (var i = 0; i < rows.length; i++) {
//items.push(rows[i]);
$('.ecoli_table tr:first').after('<tr><td>' + rows[i].join('</td><td>') + '</td></tr>');
}
if (typeof ecoliTable == 'undefined') {
// dataTables
ecoliTable = $(".ecoli_table").dataTable({
"sPaginationType": "full_numbers",
"aLengthMenu": [[10, 25, 50, -1], [10, 25, 50, "All"]],
"aaSorting": [[0, "desc"]],
"bDestroy": true,
"aoColumns": [
{ "sTitle": "Sample_Date" },
{ "sTitle": "Average_E._coli_Density" },
{ "sTitle": "Recreational_Water_Quality_Guideline" }
]
});
} else {
//ecoliTable.fnDestroy();
$(".ecoli_table > tbody").empty();
ecoliTable.fnDraw();
//$('.ecoli_table').find("tr:gt(0)").remove();
}
},
error: function () {
alert("Data is not available for this location at the present time, please check back at a later time. Thank you.");
}
});
}
function getAlgaeData(beachID,beach_location,beach,region) {
//local namespace
var rows = [];
var algaeTable;
var items = [];
var queryURL = "https://www.googleapis.com/fusiontables/v1/query?sql=";
var queryTail = '&key=apikey&callback=?';
var whereClause = "WHERE 'Beach_ID' = " + beachID;
var query = "SELECT 'Sample_Date','Algal_Toxin_Microcystin','Recreational_Guideline_20','Blue_Green_Algae_Cells','Recreational_Guideline' FROM tableid " + whereClause + " ORDER BY 'Sample_Date' DESC";
var queryText = encodeURI(query);
$.ajax({
type: "GET",
url: queryURL + queryText + queryTail,
cache: false,
dataType: 'jsonp',
success: function (data) {
rows = data.rows;
// empty table
//$('#content_placeholder').empty();
//$('.algae_table').remove();
$('#algae_heading').empty();
$('.ecoli_table').after('<h6 id="algae_heading">Algae Data</h6>');
$('.algae_table').append('<tr>'
+ '<th>Sample Date</th>'
+ '<th>Algal_Toxin_Microcystin</th>'
+ '<th>Recreational_Guideline_20</th>'
+ '<th>Blue_Green_Algae_Cells</th>'
+ '<th>Recreational_Guideline</th>'
+ '</tr>');
for (var i = 0; i < rows.length; i++) {
//items.push(rows[i]);
$('.algae_table tr:first').after('<tr><td>' + rows[i].join('</td><td>') + '</td></tr>');
}
if (typeof algaeTable == 'undefined') {
//algae
algaeTable = $(".algae_table").dataTable({
"sPaginationType": "full_numbers",
"aLengthMenu": [[10, 25, 50, -1], [10, 25, 50, "All"]],
"bDestroy": true,
"aaSorting": [[0, "desc"]],
"aoColumns": [
{ "sTitle": "Sample_Date" },
{ "sTitle": "Algal_Toxin_Microcystin" },
{ "sTitle": "Recreational_Guideline_20" },
{ "sTitle": "Blue_Green_Algae_Cells" },
{ "sTitle": "Recreational_Guideline" }
]
});
} else {
//algaeTable.fnDestroy();
$(".algae_table > tbody").empty();
algaeTable.fnDraw();
//$('.algae_table').find("tr:gt(0)").remove();
}
},
error: function () {
alert("Data is not available for this location at the present time, please check back at a later time. Thank you.");
}
});
}
我正在尝试查询 2 个不同的 Google Fusion 表并在 google infoWindow 中的新选项卡下返回每个表。但是，我遇到了问题，因为我似乎无法将数组或字符串从 $.ajax 函数返回到父范围。例如，上面的 items 数组返回 undefined。非常感谢您对此的任何想法。
在此先感谢，迈克尔