我已经编写了一个我很满意的Google Fusion Tables脚本（下图），但它在我的表中只加载了500行点，其中有超过20,000行。这是我第一次来到这个社区，我很惊讶地找到了限制。有没有办法加载所有行？
<!doctype html>
<html class="no-js" lang="en">
<head>
<meta charset="utf-8">
<meta content="IE=edge,chrome=1" http-equiv="X-UA-Compatible">
<title>Points in box</title>
<link href="./stylesheets/example.css" media="screen" rel="stylesheet" type="text/css" />
<link rel="shortcut icon" href="/images/favicon.ico" />
<noscript><meta http-equiv="refresh" content="0;url=/no_javascript.html"></noscript>
<!-- Find box coordinates javascript -->
<script type ="text/javascript" src="http://www.movable-type.co.uk/scripts/latlon.js"></script>
<!-- Type label text javascript -->
<script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=false"></script>
<script type="text/javascript" src="./js/label.js"></script>
<!-- Visulization javascript -->
<script type="text/javascript" src="http://www.google.com/jsapi"></script>
<!-- Initialize visualization -->
<script type="text/javascript">
google.load('visualization', '1', {});
</script>
</head>
<body class="developers examples examples_downloads examples_downloads_points-in-box examples_downloads_points-in-box_index">
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js" type="text/javascript"></script>
<script type="text/javascript">
var store_table = 4121905;
//send a call to GViz to retrieve lat/long coordinates of the stores
function getStoreData() {
//set the query using the input from the user
var queryText = encodeURIComponent("SELECT Latitude,Longitude,Impressions FROM " + store_table);
var query = new google.visualization.Query('http://www.google.com/fusiontables/gvizdata?tq=' + queryText);
//set the callback function
query.send(doLoop);
}
function drawBox(topleftx, toplefty, bottomrightx, bottomrighty) {
var bounds = new google.maps.LatLngBounds(
new google.maps.LatLng( topleftx, toplefty ),
new google.maps.LatLng( bottomrightx, bottomrighty )
);
var overlay = new google.maps.Rectangle({
map: carto_map,
bounds: bounds,
strokeColor: "#0000ff",
strokeOpacity: 0.20,
strokeWeight: 2,
fillColor: "#0000ff",
fillOpacity: 0.050,
});
}
function doLoop(response) {
numRows = response.getDataTable().getNumberOfRows();
//Basic
var cartodbMapOptions = {
zoom: 7,
center: new google.maps.LatLng( 37.926868, -121.68457 ),
// center: new google.maps.LatLng( 40.7248057566452, -74.003 ),
// disableDefaultUI: true,
mapTypeId: google.maps.MapTypeId.ROADMAP
}
// Init the map
carto_map = new google.maps.Map(document.getElementById("map"),cartodbMapOptions);
for(i = 0; i < numRows; i++) {
var centerX = response.getDataTable().getValue(i,0);
var centerY = response.getDataTable().getValue(i,1);
var imps = response.getDataTable().getValue(i,2);
var centerPoint = new LatLon(centerX,centerY);
var latLng = new google.maps.LatLng(centerX,centerY);
var toplefty = centerPoint.destinationPoint(-45, 6)._lon;
var topleftx = centerPoint.destinationPoint(-45, 7.7)._lat;
var bottomrighty = centerPoint.destinationPoint(135, 6)._lon;
var bottomrightx = centerPoint.destinationPoint(135, 7.7)._lat;
drawBox(topleftx, toplefty, bottomrightx, bottomrighty);
var marker = new google.maps.Marker({
position: latLng,
draggable: false,
markertext: imps,
flat: true,
map: carto_map
});
var label = new Label({
map: carto_map,
position: latLng,
draggable: true
});
label.bindTo('text', marker, 'markertext');
marker.setMap(null);
}
}
$(function() {
getStoreData();
});
</script>
<div id="map"></div>
</body>
</html>
答案 0 :(得分：3)
我通过使用json调用方法解决了这个问题。代码如下。
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>David's Build Up</title>
<link href="./stylesheets/example.css" media="screen" rel="stylesheet" type="text/css" />
<link rel="shortcut icon" href="/images/favicon.ico" />
<noscript><meta http-equiv="refresh" content="0;url=/no_javascript.html"></noscript>
<!-- Find box coordinates javascript -->
<script
src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js">
</script>
<script type ="text/javascript" src="http://www.movable-type.co.uk/scripts/latlon.js"></script>
<!-- Type label text javascript -->
<script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=false"></script>
<script type="text/javascript" src="./js/label.js"></script>
<!-- Visulization javascript -->
<script type="text/javascript" src="http://www.google.com/jsapi"></script>
<!-- Initialize visualization -->
<script type="text/javascript">
google.load('visualization', '1', {});
</script>
<script type="text/javascript">
function drawBox(topleftx, toplefty, bottomrightx, bottomrighty) {
var bounds = new google.maps.LatLngBounds(
new google.maps.LatLng( topleftx, toplefty ),
new google.maps.LatLng( bottomrightx, bottomrighty )
);
var overlay = new google.maps.Rectangle({
map: carto_map,
bounds: bounds,
strokeColor: "#0000ff",
strokeOpacity: 0.20,
strokeWeight: 2,
fillColor: "#0000ff",
fillOpacity: 0.050,
});
}
function initialize() {
// Set the map parameters
var cartodbMapOptions = {
zoom: 5 ,
center: new google.maps.LatLng( 40.313043, -97.822266 ),
mapTypeId: google.maps.MapTypeId.ROADMAP
}
// Initialize the map
carto_map = new google.maps.Map(document.getElementById("map"),cartodbMapOptions);
// Query to grab the data
var query = "SELECT Latitude, Longitude, Impressions FROM " +
'[encrypted table ID here]';
var encodedQuery = encodeURIComponent(query);
// Construct the URL to grab the data
var url = ['https://www.googleapis.com/fusiontables/v1/query'];
url.push('?sql=' + encodedQuery);
url.push('&key=AIzaSyAm9yWCV7JPCTHCJut8whOjARd7pwROFDQ');
url.push('&callback=?');
// Set the number of rows
var numRows = 3500;
// Get the variables from the table, in a loop
$.ajax({
url: url.join(''),
dataType: 'jsonp',
success: function (data) {
var rows = data['rows'];
var ftData = document.getElementById('ft-data');
for (var i in rows) {
var centerX = rows[i][0];
var centerY = rows[i][1];
var imps = rows[i][2];
// Set the center points
var centerPoint = new LatLon(centerX,centerY);
var latLng = new google.maps.LatLng(centerX,centerY);
// Set top left points
var toplefty = centerPoint.destinationPoint(-45, 6)._lon;
var topleftx = centerPoint.destinationPoint(-45, 7.7)._lat;
// Set bottom right points
var bottomrighty = centerPoint.destinationPoint(135, 6)._lon;
var bottomrightx = centerPoint.destinationPoint(135, 7.7)._lat;
// Draw the box
drawBox(topleftx, toplefty, bottomrightx, bottomrighty);
// Drop markers
var marker = new google.maps.Marker({
position: latLng,
draggable: false,
markertext: imps,
flat: true,
map: carto_map
});
var label = new Label({
map: carto_map,
position: latLng,
draggable: true
});
label.bindTo('text', marker, 'markertext');
marker.setMap(null);
};
}
});
}
</script>
</head>
<body onload="initialize()">
<div id="map"></div>
<div id="ft-data"></div>
</body>
</html>
答案 1 :(得分：1)
Gviz API对给定查询确实有500行限制。
任何表都限制为100,000个 mappable 行，但这远远超出您报告的20,000行。
新的Javascript API，目前接受受信任的测试人员，为查询返回的任意数量的行提供JSON格式支持。您可以通过申请此群组的成员资格来申请TT计划： https://groups.google.com/group/fusion-tables-api-trusted-testers
-Rebecca
答案 2 :(得分：0)
fusiontables / gvizdata网址适用于Gviz图表，因此限制为500分。还有其他查询方法没有这个限制。有关示例，请参阅https://developers.google.com/fusiontables/docs/sample_code。
答案 3 :(得分：0)
我通过删除所有行并插入新行来定期刷新2500行表。我的代码中构造INSERT sql的循环有一个嵌套循环，只计数到400，发送该sql，然后开始构建另一个包含下400条记录的循环。