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toolbars.Draw:  Clear last point when a new point is clicked.

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4
01-14-2011 06:20 AM
MikeLong
by
Occasional Contributor
‎01-14-2011 06:20 AM
I am creating a map that will provide coordinates when a point is clicked on the map.  I want to have a graphic provided on the clicked location so I am going to using the drawing functionality as well.  Where I am stuck so far is how do I clear the last point when a new point is clicked?

I have pasted my code below.

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <meta http-equiv="X-UA-Compatible" content="IE=7" />
    <meta name="viewport" content="width=device-width,user-scalable=no"/>
    <!--The viewport meta tag is used to improve the presentation and behavior of the samples 
      on iOS devices-->
    <meta name="viewport" content="initial-scale=1, maximum-scale=1,user-scalable=no"/>
    <title>Maps Toolbar</title>
    <link rel="stylesheet" type="text/css" href="http://serverapi.arcgisonline.com/jsapi/arcgis/2.1/js/dojo/dijit/themes/claro/claro.css">
    <style type="text/css">
      html, body {
        height: 100%; width: 100%; margin: 0; padding: 0;
      }
    </style>
    <script type="text/javascript">
      djConfig = {
        parseOnLoad: true
      }
    </script>
    <script type="text/javascript" src="http://serverapi.arcgisonline.com/jsapi/arcgis/?v=2.1"></script>
    <script type="text/javascript">
      dojo.require("esri.map");
      dojo.require("esri.toolbars.draw");
      dojo.require("dijit.dijit"); // optimize: load dijit layer
      dojo.require("dijit.layout.BorderContainer");
      dojo.require("dijit.layout.ContentPane");


      var map, toolbar, symbol, geomTask;
      function init() {
        var startExtent = new esri.geometry.Extent({"xmin":-11721159.665358918,"ymin":-1138850.8106919006,"xmax":8277212.918942982,"ymax":9858297.322750043,"spatialReference":{"wkid":102100}});
        map = new esri.Map("map",{extent:startExtent});
        dojo.connect(map, "onLoad", createToolbar);
        var basemap = new esri.layers.ArcGISTiledMapServiceLayer("http://server.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer");
        map.addLayer(basemap);
      }

      function createToolbar(map) {
        toolbar = new esri.toolbars.Draw(map);
        //set drawing mode to extent
        toolbar.activate(esri.toolbars.Draw.POINT);
        dojo.connect(toolbar, "onDrawEnd", addToMap);
      }

      function addToMap(geometry) {
      //toolbar.deactivate();
      map.showZoomSlider();
       switch (geometry.type) {
          case "point":
            var symbol = new esri.symbol.SimpleMarkerSymbol(esri.symbol.SimpleMarkerSymbol.STYLE_X, 10, new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_SOLID, new dojo.Color([255,0,0]), 2), new dojo.Color([0,255,0,1]));
            
        }
        
        var graphic = new esri.Graphic(geometry, symbol);
        map.graphics.add(graphic);
      }

      dojo.addOnLoad(init);
    </script>
  </head>
  <body class="claro">
<div id="mainWindow" dojotype="dijit.layout.BorderContainer" design="headline" gutters="false" style="width:100%; height:100%;">
    
      
    <div id="map" dojoType="dijit.layout.ContentPane" style="border:solid 2px #587498;margin:5px;" region="center">
    </div>
</div>
  </body>
</html>
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4 Replies
Kathleen_Crombez
by
Frequent Contributor
‎01-14-2011 10:52 AM
add the following line to the top of your addToMap function:

map.graphics.clear();



function addToMap(geometry) {
      map.graphics.clear();
      //toolbar.deactivate();
      map.showZoomSlider();
       switch (geometry.type) {
          case "point":
            var symbol = new esri.symbol.SimpleMarkerSymbol(esri.symbol.SimpleMarkerSymbol.STYLE_X, 10, new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_SOLID, new dojo.Color([255,0,0]), 2), new dojo.Color([0,255,0,1]));
      }
      var graphic = new esri.Graphic(geometry, symbol);
      map.graphics.add(graphic);
}
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MikeLong
by
Occasional Contributor
‎01-14-2011 11:04 AM
Thanks Kathleen, that was it. 🙂

I had actually tried that but just added it to the wrong place. 😮
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MarkHoover
by
Frequent Contributor
‎01-18-2011 11:34 AM
Of course, if there are other graphics on the map you do not want cleared (i.e., you only want the coordinate point graphics cleared) this will not work.  You could have a separate graphics layer that only holds the coordinate point graphics and clear out all of the graphics in it before adding the new point.
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HemingZhu
by
Frequent Contributor
‎01-20-2011 09:19 AM
I am creating a map that will provide coordinates when a point is clicked on the map.  I want to have a graphic provided on the clicked location so I am going to using the drawing functionality as well.  Where I am stuck so far is how do I clear the last point when a new point is clicked?

I have pasted my code below.

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <meta http-equiv="X-UA-Compatible" content="IE=7" />
    <meta name="viewport" content="width=device-width,user-scalable=no"/>
    <!--The viewport meta tag is used to improve the presentation and behavior of the samples 
      on iOS devices-->
    <meta name="viewport" content="initial-scale=1, maximum-scale=1,user-scalable=no"/>
    <title>Maps Toolbar</title>
    <link rel="stylesheet" type="text/css" href="http://serverapi.arcgisonline.com/jsapi/arcgis/2.1/js/dojo/dijit/themes/claro/claro.css">
    <style type="text/css">
      html, body {
        height: 100%; width: 100%; margin: 0; padding: 0;
      }
    </style>
    <script type="text/javascript">
      djConfig = {
        parseOnLoad: true
      }
    </script>
    <script type="text/javascript" src="http://serverapi.arcgisonline.com/jsapi/arcgis/?v=2.1"></script>
    <script type="text/javascript">
      dojo.require("esri.map");
      dojo.require("esri.toolbars.draw");
      dojo.require("dijit.dijit"); // optimize: load dijit layer
      dojo.require("dijit.layout.BorderContainer");
      dojo.require("dijit.layout.ContentPane");


      var map, toolbar, symbol, geomTask;
      function init() {
        var startExtent = new esri.geometry.Extent({"xmin":-11721159.665358918,"ymin":-1138850.8106919006,"xmax":8277212.918942982,"ymax":9858297.322750043,"spatialReference":{"wkid":102100}});
        map = new esri.Map("map",{extent:startExtent});
        dojo.connect(map, "onLoad", createToolbar);
        var basemap = new esri.layers.ArcGISTiledMapServiceLayer("http://server.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer");
        map.addLayer(basemap);
      }

      function createToolbar(map) {
        toolbar = new esri.toolbars.Draw(map);
        //set drawing mode to extent
        toolbar.activate(esri.toolbars.Draw.POINT);
        dojo.connect(toolbar, "onDrawEnd", addToMap);
      }

      function addToMap(geometry) {
      //toolbar.deactivate();
      map.showZoomSlider();
       switch (geometry.type) {
          case "point":
            var symbol = new esri.symbol.SimpleMarkerSymbol(esri.symbol.SimpleMarkerSymbol.STYLE_X, 10, new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_SOLID, new dojo.Color([255,0,0]), 2), new dojo.Color([0,255,0,1]));
            
        }
        
        var graphic = new esri.Graphic(geometry, symbol);
        map.graphics.add(graphic);
      }

      dojo.addOnLoad(init);
    </script>
  </head>
  <body class="claro">
<div id="mainWindow" dojotype="dijit.layout.BorderContainer" design="headline" gutters="false" style="width:100%; height:100%;">
    
      
    <div id="map" dojoType="dijit.layout.ContentPane" style="border:solid 2px #587498;margin:5px;" region="center">
    </div>
</div>
  </body>
</html>


add a line map.graphics.clear(); in your function like this:
function addToMap(geometry) {
      //toolbar.deactivate();
      map.showZoomSlider();
      map.graphics.clear();
       switch (geometry.type) {
          case "point":
            var symbol = new esri.symbol.SimpleMarkerSymbol(esri.symbol.SimpleMarkerSymbol.STYLE_X, 10, new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_SOLID, new dojo.Color([255,0,0]), 2), new dojo.Color([0,255,0,1]));
           
        }
       
        var graphic = new esri.Graphic(geometry, symbol);
        map.graphics.add(graphic);
      }

OR: set the point graphic as globle variable and add map.graphics.remove(graphic) in your function:
function addToMap(geometry) {
      //toolbar.deactivate();
      map.showZoomSlider();
      map.graphics.remove(graphic);
       switch (geometry.type) {
          case "point":
            var symbol = new esri.symbol.SimpleMarkerSymbol(esri.symbol.SimpleMarkerSymbol.STYLE_X, 10, new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_SOLID, new dojo.Color([255,0,0]), 2), new dojo.Color([0,255,0,1]));
           
        }
       
        graphic = new esri.Graphic(geometry, symbol);
        map.graphics.add(graphic);
      }
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