topic Re: Type error: Graphis is null in ArcGIS JavaScript Maps SDK Questions

Type error: Graphis is null

SK — Wed, 24 Oct 2012 00:56:16 GMT

I added a base layer with spatial reference 102100. When I try to add a point and a symbol to it, it throws an error at
map.graphics.add - graphics is null. Here is my code

var pt= new esri.geometry.Point(x,y,sr);
var sms= new esri.symbol.SimpleMarkerSymbol(...);
var label = new esri.Graphic(pt,sms);
map.graphics.add(label);

Firebug shows label holds the pt and sms values. What could be causing the issue?

Re: Type error: Graphis is null

StephenLead — Sun, 12 Dec 2021 06:52:10 GMT

Note that the help file for graphicsLayer says:

The graphics object is available to use after the Map.onLoad event.

So you should place your code below inside an event which runs once the map has loaded:

dojo.connect(map, "onLoad", function() {
  var pt= new esri.geometry.Point(x,y,sr);
  var sms= new esri.symbol.SimpleMarkerSymbol(...);
  var label = new esri.Graphic(pt,sms);
  map.graphics.add(label);
});

Re: Type error: Graphis is null

SK — Wed, 24 Oct 2012 03:07:51 GMT

Thanks Stevel. I tried that as well, still it was giving me the same error. Any thoughts?

Re: Type error: Graphis is null

StephenLead — Wed, 24 Oct 2012 03:22:13 GMT

Thanks Stevel. I tried that as well, still it was giving me the same error. Any thoughts?

Can you post your whole code (or at least enough to reproduce the problem)?

Cheers,
Steve

Re: Type error: Graphis is null

__Rich_ — Wed, 24 Oct 2012 08:57:28 GMT

Don't forget the map cannot function without a non-Graphics layer:

http://forums.arcgis.com/threads/65475-Graphics-without-a-base-map

Re: Type error: Graphis is null

SK — Wed, 24 Oct 2012 20:50:19 GMT

Thanks. Now, I can get the points show up. I am wondering if a text (textsymbol) can be added as below. Text is not showing up. I am not sure if am doing it right. Please help

dojo.connect(map, "onLoad", function(){

      var xy = new esri.geometry.Point ([-13074275.960 , 4015990.240], new esri.SpatialReference({wkid:102100}));

   //var xy = new esri.geometry.Point([-117.440 , 33.905] , new esri.SpatialReference({wkid:102100}));

   var sms = new esri.symbol.SimpleMarkerSymbol(esri.symbol.SimpleMarkerSymbol.STYLE_SQUARE, 10,
   new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_SOLID,
   new dojo.Color([47,85,89]), 1),
   new dojo.Color([112,15,70]));

   var text = new esri.symbol.TextSymbol("Hello World").setColor(
    new dojo.Color([128,0,0])).setAlign(esri.symbol.Font.ALIGN_START).setAngle(45).setFont(
    new esri.symbol.Font("12pt").setWeight(esri.symbol.Font.WEIGHT_BOLD)) ;

   var ptlabel= new esri.Graphic(xy,sms,text);

          map.graphics.add(ptlabel);
   });

Re: Type error: Graphis is null

__Rich_ — Thu, 25 Oct 2012 11:19:07 GMT

Could you start a new thread for this separate issue? (and close off this one by marking the relevant post as the answer)