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7.4

google map api application : I need help on drawing polyline using for loop.

Asked by ilaiyaraja in JavaScript, GIS & GPS Programming

Tags: google map api polyline

Dear sir,
I need help on drawing polyline using forloop.  i am having some fixed place names in an array. Using forloop i am interating the plances array and taking corresponding lan and long from getLatLng() method. But the execution is not synchronize. Its working like a thread. please have a look at my code.

Please reply me with good tutorial and if its there any IDE for Google map application, inform me. Please help me.

   var map = null;
    var geocoder = null;
      var latlng = new Array(10);
      var latlong = new Array(10);
      var polyOptions = {geodesic:true};
      latlng[0]="Bangalore";
            latlng[1]="Tumkur";
            latlng[2]="Arsikere";
            latlng[3]="Kadur";
            latlng[4]="Birur";
            latlng[5]="Tarikere";
            latlng[6]="Bhadravathi";
            latlng[7]="Shimoga";
      var latlongstring = "";
  function showAddress(address,address1) {

      if (geocoder) {

          for(i = 0; i<=7; i++)      {

///////////////// the following statement is executing something strangely.///////////////////
                  geocoder.getLatLng(
                                latlng[i],function(point1) {
                                    if (!point1) {
                                          //alert( i + " not found");
                                    } else {
                                            latlong[i]=point1;
                                                //latlongstring += " , "+point1;
                                            var marker = new GMarker(point1);
                                            map.addOverlay(marker);
                                                //alert(latlong[i]+"inside else");
                                    }
                                  }
                          );
           
            }
            var polyline = new GPolyline(
                        [
                         latlong[0],  
                          latlong[1],
                         latlong[2],
                         latlong[3],
                         latlong[4],
                        latlong[5],
                         latlong[6],
                         latlong[7],  
                        ], "#FF0000", 4,1, polyOptions
            );
            
            map.addOverlay(polyline);
            } 
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<html xmlns="http://www.w3.org/1999/xhtml" xmlns:v="urn:schemas-microsoft-com:vml">
  <head>
    <meta http-equiv="content-type" content="text/html; charset=UTF-8"/>
    <title>Google Maps API Example: Simple Geocoding</title>
    <script src="http://maps.google.com/maps?file=api&amp;v=2.x&amp;key=ABQIAAAAzr2EBOXUKnm_jVnk0OJI7xSosDVG8KKPE1-m51RBrvYughuyMxQ-i1QfUnH94QxWIa6N4U6MouMmBA" type="text/javascript"></script>
    <script type="text/javascript"> 
    var map = null;
    var geocoder = null;
	var latlng = new Array(10);
	var latlong = new Array(10);
	var polyOptions = {geodesic:true};
	latlng[0]="Bangalore";
		latlng[1]="Tumkur";
		latlng[2]="Arsikere";
		latlng[3]="Kadur";
		latlng[4]="Birur";
		latlng[5]="Tarikere";
		latlng[6]="Bhadravathi";
		latlng[7]="Shimoga";
	var latlongstring = ""; 
    function initialize() {
      if (GBrowserIsCompatible()) {
        map = new GMap2(document.getElementById("map_canvas"));
        map.setCenter(new GLatLng(12.9697903,77.5797214),7);
        map.enableScrollWheelZoom();
        geocoder = new GClientGeocoder();
      }
    } 
    function showAddress(address,address1) { 
   		if (geocoder) {
		i = 0;
    	do{	
			geocoder.getLatLng(
	    	    		latlng[i],function(point1) {
		            		if (!point1) {
			            		//alert( i + " not found");
	        		    	} else {
	              				latlong[i]=point1;
								latlongstring += " , "+point1;
	              				var marker = new GMarker(point1);
	              				map.addOverlay(marker);
								//alert(latlong[i]+"inside else");
	            			}
	          			}
        			);
            i++;
		}while(i<=7);
		 
		alert("out side "+latlongstring);
       
		alert("out side 1"+latlongstring);
		var latlongSplit = new Array(10);
		latlongstring = latlongstring.replace("),(","").replace("),(","");
				 alert(latlongstring);
		 latlongstring.replace(")","");
		 latlongstring.replace(",","");
				 alert(latlongstring);
//		latlongSplit = latlongstring.split(","); 
		/* for(j = 0; j< latlongSplit.length; j++){
		   alert(latlongSplit[j]);
		 }*/
		var polyline = new GPolyline(
				[
				 latlong[0],  
 				 latlong[1],
				 latlong[2],
				 latlong[3],
				 latlong[4],
 			     latlong[5],
				 latlong[6],
				 latlong[7],  
				], "#FF0000", 4,1, polyOptions
		);
		
		map.addOverlay(polyline);
		}
	
   	}
	
	function setLatLangFunc(address)
	{
		
	}
	
   	function clearMap() {
 		map.clearOverlays();
	}
    </script>
  </head> 
  <body onload="initialize()" onunload="GUnload()">
      <p>
     
        <input type="button" value="Go!" onclick="showAddress(address.value,address1.value); return false"/>
      </p>
    <div id="map_canvas" style="width: 500px; height: 300px"></div>
    <a href="#" class="button" style="text-align:center" onclick="clearMap();return false;">Clear Map</a>
  </body>
</html>
[+][-]11/05/09 03:02 PM, ID: 25755061Expert Comment

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[+][-]11/11/09 07:59 PM, ID: 25801403Accepted Solution

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About this solution

Zones: JavaScript, GIS & GPS Programming
Tags: google map api polyline
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Solution Provided By: ilaiyaraja
Participating Experts: 1
Solution Grade: A
 
[+][-]11/14/09 03:01 PM, ID: 25822800Administrative Comment

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