Question

我是一个OpenLayers网络应用程序。我绘制多边形后生成wkt格式的函数。

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('');
}

我想使用按钮将数据wkt（unionFeatures）发送到数据库（phpmyadmin），然后在刷新页面后，使用第二个按钮将数据加载到多边形中并在地图上显示它们。 / p>

如何修改此代码以及放入php文件的内容？

$('#postJson').click(function(){

    $.post('post_receiver.php', { ??? }, function(data){

    $('#response').html(data);

    }).fail(function() {
     alert( "Posting failed." );

    });
    return false;

});

请一步一步帮助

Answer 1

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 ****

将数据显示回地图：

在getData.php中

//Retrieve data as a string through SQL query from db tables.

从javascript调用按钮单击功能以在地图上显示几何图形

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 
        }
    });
}

如何将多边形保存到数据库

1 个答案: