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<!DOCTYPE html>
<html>
    <head>
        <title>WFS - GetFeature</title>
        <meta charset="utf-8"/>
        <link rel="stylesheet" href="https://cdn.jsdelivr.net/gh/openlayers/openlayers.github.io@master/en/v6.15.1/css/ol.css" type="text/css">
        <link  rel= "stylesheet"  href= "style.css"  type= "text/css"  />
        <style>
          .map {
             height: 400px;
             width: 100%;
          }
        </style>
        <script src="https://cdn.jsdelivr.net/gh/openlayers/openlayers.github.io@master/en/v6.15.1/build/ol.js"></script>
    </head>
    <body>
        <div id="map" class="map"></div>
        <label >Modifier &nbsp;</label>
        <button name="modifier" id="mod" value="Edit"></button>
        <label >Creer &nbsp;</label>
        <button name="Creer" id="creer" value="creer"></button>
        <label >Stop Edition &nbsp;</label>
        <button name="stop_modif" id="stop_mod" value="stop_Edit"></button>
        <script>
          var draw, modify, snap;
          var maprojection= new ol.proj.Projection({
            code:'EPSG:4326',
            extent:[-20,30,20,50],
            units:'degrees',
            axisOrientation:'enu'
          });
          //surcharge de la projection EPSG:4326
          ol.proj.addEquivalentProjections([ol.proj.get('EPSG:4326'), maprojection]);
          var wfsSource = new ol.source.Vector({
            format: new ol.format.GeoJSON(),
            url: function(extent) {
                return 'http://127.0.0.1/cgi-bin/tinyows.exe?service=WFS&'+
                'version=1.1.0&request=GetFeature&typename=tows:demo_tyny&'+
                'outputFormat=application/json&srsName=EPSG:4326&'+
                'bbox='+ extent.join(',')+',EPSG:4326';
            },
            strategy: ol.loadingstrategy.bbox,
            projection:maprojection

          });
          var vector = new ol.layer.Vector({
            source: wfsSource,
            style: new ol.style.Style({
                stroke: new ol.style.Stroke({
                    color: 'rgba(0,0,255,1.0)',
                    width:4
                })
            })
          });
          var raster= new ol.layer.Tile({
            source: new ol.source.OSM()
          });
          var map = new ol.Map({
            layers:[raster,vector],
            target: document.getElementById('map'),
            view: new ol.View({
                projection: maprojection,
                center: [2.5,46],
                maxZoom: 20,
                zoom: 1
            })
          });
          var etat_edition= document.getElementById('mod');
          var etat_creation= document.getElementById('creer');
          var stop_edition= document.getElementById('stop_mod');
          var draw, snap, modify; //declarees globalement pour les activers ou non a la guise
          var formatWFS = new ol.format.WFS();
          var formatGML =  new ol.format.GML3({
            version:'1.1.0',
            featureNS: 'http://www.mapserver.org/tinyows',
            url: 'http://127.0.0.1/cgi-bin/tinyows.exe',
            featureType:'demo_tyny',
            srsName:'EPSG:4326',
            geometryName: 'geometry',
            SchemaLocation:'http://127.0.0.1/cgi-bin/tinyows.exe?service=wfs&request=DescribeFeatureType&version=1.1.0&typename=tows:demo_tyny'
          });
          var xs = new XMLSerializer();
          var transactWFS = function (mode, f) {
            var node;
            switch(mode) {
                case 'insert':
                    node = formatWFS.writeTransaction([f], null, null, formatGML);
                    break;
                case 'update':
                    node = formatWFS.writeTransaction(null, [f], null, formatGML);
                    break;
                case 'delete':
                    node = formatWFS.writeTransaction(null, null, [f], formatGML);
                    break;
            }
            var xml_data = xs.serializeToString(node);
            fetch('http://localhost/cgi-bin/tinyows.exe?service=wfs', {
              service: 'WFS',
              Method: 'POST',
              body: xml_data,
              dataType: 'xml',
              processData: false,
              contentType: 'text/xml',
              data: xml_data
            }).then(function() {
              wfsSource.clear();
            });
          };
          function add_snap() {
            snap = new ol.interaction.Snap({source: wfsSource});
            map.addInteraction(snap);
          };
          function add_modify(){
            stopInteractions();
            add_snap();
            modify = new ol.interaction.Modify({source: wfsSource});
            map.addInteraction(modify)
          };
          function add_creer(){
            stopInteractions();
            add_snap();
            draw = new ol.interaction.Draw({
                source: wfsSource,
                type:"MultiPolygon",
                geometryName:'geometry'
            });
            draw.on('drawend', function(e){
                code_saisi=prompt("code_commune");
                e.feature.setProperties({'code_commune':code_saisi});
                transactWFS('insert',e.feature);
            });
            map.addInteraction(draw);
          };
          function stopInteractions() {
            map.removeInteraction(draw);
            map.removeInteraction(snap);
            map.removeInteraction(modify)

          };
          etat_edition.onclick = function() {
            add_modify();
          };
          etat_creation.onclick = function() {
            add_creer();
          };
          stop_edition.onclick = function () {
            stopInteractions();
          };

        </script>
    </body>
</html>