Only return selected GeoJSON elements in Leaflet -


i have code osm alley elements in map , has button print elements retrieved overpass api.

instead retrieving elements, me able :

  1. select multiple elements on map clicking on want (the selected elements marked different color blue).
  2. return selected elements.

here javascript code:

        // initializing map         var map = new l.map('map', {             center: l.latlng(46.827, -71.227),             zoom: 15,             zoomcontrol: false,             layers: l.tilelayer('http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png')         });         map.addcontrol(l.control.zoom({position:'topleft'}));         var geolayer = l.geojson().addto(map);                      //getting elements on map         $.ajax({             data: "data=[out:json];way[highway=service][service=alley](46.822161505913414,-71.23554468154907,46.83211547933473,-71.21927976608276);(._;>;);out;",             type: 'post',             datatype: 'json',             url: 'http://overpass-api.de/api/interpreter',             success: function(json) {                  //loading warning...                 $('#preloader').hide();                      $('#preloader')                 .ajaxstart(function(){                     $(this).show();                 }).ajaxstop(function(){                     $(this).hide();                 });                   //putting elements on map                 var geojson = osmtogeojson(json);                 geolayer = l.geojson(geojson, {                     oneachfeature: function (feature, layer) {                         //bind click                         layer.on({                             click: null //add property feature "selected: true" if selected false , vice versa??????                         });                         //change style                         // ??? if selected false, keep default brue alleys, selected true go light green?                     }                 }).addto(map);             }         });          // printing elements         function getallelements() {              var allmarkersobjarray = [];//new array();             var allmarkersgeojsonarray = [];//new array();              $.each(map._layers, function (ml) {                 //console.log(map._layers)                 if (map._layers[ml].feature) {                      allmarkersobjarray.push(this)                     allmarkersgeojsonarray.push(json.stringify(this.togeojson()))                 }             })              console.log(allmarkersobjarray);             alert("total markers : " + allmarkersgeojsonarray.length + "\n\n" + allmarkersgeojsonarray + "\n\n see console object view of array" );         }          $(".get-elements").on("click", getallelements);

and here html:

<!doctype html public "-//w3c//dtd xhtml 1.0 strict//en" "http://www.w3.org/tr/xhtml1/dtd/xhtml1-strict.dtd">  <html xmlns="http://www.w3.org/1999/xhtml">      <head>          <title></title>          <meta http-equiv="content-type" content="text/html; charset=utf-8" />          <link rel="stylesheet" href="//cdn.jsdelivr.net/leaflet/0.7.3/leaflet.css"/>         <style>             #map {                 float:left;                 width:900px;                 height:600px;                }         </style>     </head>     <body>         <h4>here alleys. please select alleys use , click send.</h4>         <div id="preloader">chargement...</div>         <div id="map"></div>         <input class="get-elements" type="button" value="send" />         <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>         <script src="//cdn.jsdelivr.net/leaflet/0.7.3/leaflet.js"></script>         <script src="/assets/javascripts/leaflet/osmtogeojson.js"></script>         <script>code here</script>     </body> </html>

thanks help!

on each feature can set new property selected true , color follows: 

layer.on('click', function (e) {  //set feature selected, can use layer.feature.properties e.target.feature.properties.selected = true;  //set style, ever style option want  layer.setstyle({opacity:1,width:3, fillcolor:"#0080ff"});  }

to select features having property selected:true, (didn't try or test , may buggy)

$.each(map._layers, function (ml) {                 //console.log(map._layers)                 if (map._layers[ml].feature && map._layers[ml].feature.properties.selected === true) {                      allmarkersobjarray.push(this)                     allmarkersgeojsonarray.push(json.stringify(this.togeojson()))                 }             })

ps> no need use $.each here, use plain loop


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