[英]How to save a polygon to the database
我有一个OpenLayers网络应用程序。 我有一个函数,在绘制多边形后会生成wkt格式。
function generateWkt() {
var featureWkt, modifiedWkt;
var unionFeatures = [];
layer.getSource().forEachFeature(function(f) {
var featureClone = f.clone();
featureWkt = wkt.writeFeature(featureClone);
if(featureWkt.match(/MULTIPOLYGON/g)) {
modifiedWkt = (featureWkt.replace(/MULTIPOLYGON/g, '')).slice(1, -1);
} else {
modifiedWkt = (featureWkt.replace(/,/g, ', ')).replace(/POLYGON/g, '');
}
unionFeatures.push(modifiedWkt);
});
layer.getSource().getFeatures().length ? $('#wkt').text('MULTIPOLYGON(' + unionFeatures + ')') : $('#wkt').text('');
}
我想使用一个按钮将数据wkt(unionFeatures)发送到数据库(phpmyadmin),然后刷新页面后,使用第二个按钮将数据加载到多边形中并将其显示在地图上。
如何修改此代码以及将什么放在php文件中?
$('#postJson').click(function(){
$.post('post_receiver.php', { ??? }, function(data){
$('#response').html(data);
}).fail(function() {
alert( "Posting failed." );
});
return false;
});
请逐步帮助
要保存数据:
//javascript code
//Send the json object to php file to save to db
$.ajax({
type: 'post',
dataType: "json",
data:JSON.stringify(unionFeatures),
url: "http://localhost/post_receiver.php",
success: function (data) {
alert("data sent");
}
});
在post_receiver.php中
$data = json_decode(trim(file_get_contents('php://input')), true);
//Save the $data to db using your logic. You may have to separate
//multiple geometries WKT and insert separately.
//***Saving logic ****
要将数据显示回地图:
在getData.php中
//Retrieve data as a string through SQL query from db tables.
javascript中的“呼叫”按钮单击功能可在地图上显示几何
function showGeometriesOnMap(){
$.ajax({
type: 'get',
dataType: "json",
url: "http://localhost/getData.php",
success: function (data) {
var retrievedData = JSON.parse(data);
//Display on map logic here
//See https://openlayers.org/en/latest/examples/wkt.html to
//show on map from WKT
}
});
}
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