topic Re: Uncaught TypeError: this.map.getLayer is not a function in ArcGIS JavaScript Maps SDK Questions

Uncaught TypeError: this.map.getLayer is not a function

RolandoFlorez — Fri, 25 Nov 2016 14:22:02 GMT

Hi, I need some of help

this is my code:

_reportLayerInfo : function () {
   console.warn('reportLayerInfo');
   console.log(this.allLayerInfos);
   var filteredArr = array.filter(this.allLayerInfos, function (item) {
      return item.getSubLayers().length == 0;
   });
   console.warn('filtered layers infos');
   console.log(filteredArr);
   array.forEach(filteredArr,function(layer){
      console.log(lang.hitch(this,this.map.getLayer(layer.id)));
   });
}

(sorry, I dont known how put a code block)

So, _reportLayerInfo() method is activate when I clic a button, now, when I clic the button, the console shows me that error: Uncaught TypeError: this.map.getLayer is not a function.

As you can see, I used the lang.hitch because I thought that It was the solution.

Thanks a lot.

Re: Uncaught TypeError: this.map.getLayer is not a function

Drew — Sat, 11 Dec 2021 14:37:55 GMT

Try calling another function in your class;

Dojo Sample: (see processEvent)

require(["dojo/on", "dojo/_base/lang"], function(on, lang){

  var processEvent = function(e){
    this.something = "else";
  };

  on(something, "click", lang.hitch(this, processEvent));

});‍‍‍‍‍‍‍‍‍

So your code might be something like...

 array.forEach(filteredArr,function(layer){
      console.log(lang.hitch(this,getLayer);
   });

...
...
...



getLayer:function()
{
   this.map.getLayer(layer.id))
}‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Re: Uncaught TypeError: this.map.getLayer is not a function

RobertScheitlin__GISP — Fri, 25 Nov 2016 17:17:50 GMT

Rolando,

I agree with Andrew that you need to use lang.hitch to keep your result functions in scope. So the main thing is anytime you have a function call after you do some process your results are likely in a different scope and you need to use lang.hitch to keep that function in the same scope as the main code.