topic Re: this.sceneView.hitTest(screenPoint): Uncaught TypeError in ArcGIS Web AppBuilder Questions

this.sceneView.hitTest(screenPoint): Uncaught TypeError

Anonymous User — Sun, 12 Dec 2021 15:59:56 GMT

I created a small application using JavaScript API 4.2 (3D) which works fine. Now, I am trying to replicate the same within WAB. However, I have a problem executing sceneView.hitTest() function. it gave me an "Uncaught TypeError". I am new to WAB so I can't figure out what I am doing wrong. I would greatly appreciate any inputs.

Here is the error I am getting and code.

onOpen: function(){ 
   console.log('onOpen');
   this.sceneView.on("click", function(event){ 
        var screenPoint = {x: event.x, y: event.y};         
        console.log(screenPoint);         
        this.sceneView.hitTest(screenPoint).then(function(res){
           console.log(res.results[0]);
         });
    });      
},

Thank you,
Makiko

Re: this.sceneView.hitTest(screenPoint): Uncaught TypeError

RobertScheitlin__GISP — Fri, 10 Dec 2021 23:06:45 GMT

Makiko,

Your issue is the scope of "this" has changed inside your sceneView click event handler. So to get past that you need to use lang.hitch:

onOpen: function(){ 
   console.log('onOpen');
   this.sceneView.on("click", lang.hitch(this, function(event){ 
        var screenPoint = {x: event.x, y: event.y};         
        console.log(screenPoint);         
        this.sceneView.hitTest(screenPoint).then(function(res){
           console.log(res.results[0]);
         });
    }));      
},‍‍‍‍‍‍‍‍‍‍

Re: this.sceneView.hitTest(screenPoint): Uncaught TypeError

Anonymous User — Fri, 10 Feb 2017 14:08:04 GMT

Robert,

Learning lang.hitch is game changing!! Thank you so much!!