topic Hide Tiled Layer Using Array in ArcGIS JavaScript Maps SDK Questions

Hide Tiled Layer Using Array

LauraMiles1 — Fri, 10 Dec 2021 20:37:59 GMT

Hi all, I'm not sure where I'm going wrong. I have many many ArcGISTiledMapServiceLayers in my map that need to be hidden/shown en masse. So I created an array containing the names of each layer, and would like to use a loop to go through the array and hide each element.

var swipeLayerOrthos2015 = new ArcGISTiledMapServiceLayer("http://cop-gis4:6080/arcgis/rest/services/Orthos/Orthos2015_WGS1984_MIXED/MapServer");
        var swipeLayerOrthos2014 = new ArcGISTiledMapServiceLayer("http://cop-gis4:6080/arcgis/rest/services/Orthos/Orthos2014_WGS1984_MIXED/MapServer");
        var swipeLayerOrthos2014RB = new ArcGISTiledMapServiceLayer("http://cop-gis4:6080/arcgis/rest/services/Orthos/Orthos2014RB_WGS1984_MIXED/MapServer");

var orthoArray = [];

orthoArray.push('swipeLayerOrthos2015', 'swipeLayerOrthos2014', 'swipeLayerOrthos2014RB');

updateOrthos();

function updateOrthos(){       
        var targetOrtho;
       
        for (var i = 0; i < orthoArray.length; i++) {
            targetOrtho = orthoArray;
            targetOrtho.hide();
         }
    }

When I run this, I get an 'Uncaught TypeError: targetOrtho.hide is not a function'

I'm not sure what I'm doing wrong, if I change things so that a variable holds the ortho's name and then hide that, it works ie.

var targetOrtho = swipeLayerOrthos2010;

targetOrtho.hide();

Works just fine. I'm not sure how my loop is really different from that. I've tried printing out each item in orthoArray to the console and it looks ok to me. Does anyone see what I'm missing? I can make a jsfiddle if the above isn't clear.

Re: Hide Tiled Layer Using Array

JimmyKroon — Wed, 20 Jan 2016 19:31:44 GMT

You've declared targetOrtho, but assigned no value to it because the loop is not setup to cycle through layers listed in orthoArray.

You need a loop that points targetOrtho to the values in orthoArray - something like this. (warning: I do python more than vb).

for targetOrtho in orthoArray:

... targetOrtho.hide

Re: Hide Tiled Layer Using Array

JoelBennett — Wed, 20 Jan 2016 19:33:31 GMT

This is because you're pushing strings into your array, and not your layers as desired. Instead of

orthoArray.push('swipeLayerOrthos2015', 'swipeLayerOrthos2014', 'swipeLayerOrthos2014RB');

you should use

orthoArray.push(swipeLayerOrthos2015, swipeLayerOrthos2014, swipeLayerOrthos2014RB);

Re: Hide Tiled Layer Using Array

LauraMiles1 — Wed, 20 Jan 2016 19:36:16 GMT

Hi Jimmy,

targetOrtho = orthoArray;

Assigns the value to targetOrtho

Re: Hide Tiled Layer Using Array

LauraMiles1 — Wed, 20 Jan 2016 19:40:47 GMT

Joel thank you, that was it!

Re: Hide Tiled Layer Using Array

JimmyKroon — Wed, 20 Jan 2016 19:48:47 GMT

Yes. I guess my eyes missed that.