How to modify Conversion Options in the Coordinate Conversion Widget?

[RichardHughes2]

const ccWidget = new CoordinateConversion({
 view: this.view,
 container: element
 });
 const filt_formats = ccWidget.viewModel.formats.filter((format) => {
 if (["basemap", "dms"].indexOf(format.name) === -1) {
 return true;
 } else {
 return false;
 }
 });
 filt_formats.forEach((format) => {
 ccWidget.formats.remove(format);
 });
 ccWidget.render();‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

In the above code I am trying to limit the conversion options in the Coordinate Conversion widget.  The formats are limited, and the conversions when the widget loads is a Collection of 1.  The issues is that the <Select> element in the widget still contains all of the original format options.  Updating the viewModel should trigger the Widget to render() so I have tried updating that as well, and I am calling render() to be sure. 

ccWidget.viewModel.formats.remove(format);‍

The error I get in the browser states, "Uncaught Error: select had a option child removed, but there is now more than one. You must add unique key properties to make them distinguishable."  

<select aria-controls="ccNode__list-item-0" aria-label="Select format" class="esri-select esri-coordinate-conversion__select-row" title="Select format"><option aria-label="xy" title="xy">XY</option><option aria-label="basemap" value="basemap">BASEMAP</option><option aria-label="dms" value="dms">DMS</option><option aria-label="dms" value="dms">DMS</option><option aria-label="mgrs" value="mgrs">MGRS</option><option aria-label="usng" value="usng">USNG</option><option aria-label="utm" value="utm">UTM</option></select>‍‍

I don't think I should modify the domNode, but the widget render() should update it.  What am I missing here?

[JanupriyaSankar]

This will work

var ccWidget = new CoordinateConversion();
var format = ccWidget.formats.filter(function (format) {
return format.name === "xy";
});
var coordinateConversionWidget = new CoordinateConversion({
view: view,
formats: format,
multipleConversions: false
});

[rogenjh]

Has anyone gotten this to work? It does not for me.

[Noah-Sager]

Hi @rogenjh, this is a good question. It looks like we can use watchUtils to wait until the formats are ready, since formats now starts empty.

Code snippet with just BASEMAP and XY:

watchUtils.whenOnce(ccWidget, "formats.length", () => {
  ccWidget.formats = ccWidget.formats.filter(f => {
    return f.name === "xy" || f.name === "basemap"
  });
});

test-app with just BASEMAP and XY:
https://codepen.io/noash/pen/XWMmmza?editors=1000

[rogenjh]

Wow. That worked perfect for me. What was screwing up the initial solution was that formats begin empty now, I suppose. Thanks for your help!

[nadja]

Hi @Noah-Sager 

Thanks for this solution. This worked for me as long as I only used the default formats.

As fas as I see in this thread, the names of the default format cannot be changed. Unfortunately, I need names which are easy to understand. Thus I added my own format, according to this sample code.

My own format works and can bee added and removed to the collection of formats:  
coordinateConversionWidget.formats.add(crs2056);
coordinateConversionWidget.formats.add(crs2056);

But I cannot remove the default formats using this command:
coordinateConversionWidget.formats.remove(xy);

Nor can I filter the formatsusing above solution. How can I display ONLY my custom format? (later on, I'll add a second one (epsg:3857)

Here you find my test: https://codepen.io/nwp_nadja_bernhard/pen/OJvWeMP?editors=0010
If you comment line 193, it works fine. But as soon as the custom format is added, it doesnot work any more. 

[Flookfinders]

Hi @Noah-Sager I was using the above code, which was working fine, but when I try and change it to use the newer reactiveUtils rather than watchUtils this no longer works.  How do you achieve the same result using the new reactiveUtils?

[Flookfinders · Accepted solution]

After a lot of playing around I finally managed to get this to work using the reactiveUtils in v4.24 by using the following code:

reactiveUtils
  .whenOnce(() => ccWidget.formats.length > 0)
  .then(() => {
    let filteredFormats =
      ccWidget.formats.items.filter(
        (f) => f.name === "basemap" || f.name === "xy"
      );
    filteredFormats[
      filteredFormats.findIndex((f) => f.name === "basemap")
    ].label = "BNG";
    filteredFormats[
      filteredFormats.findIndex((f) => f.name === "xy")
    ].label = "Long/Lat";
    ccWidget.formats.items = filteredFormats;
  });

reactiveUtils
  .whenOnce(() => ccWidget.conversions)
  .then(() => {
    ccWidget.conversions.removeAll();
    const f = ccWidget.formats.items.find(
      (f) => f.name === "basemap"
    );
    ccWidget.conversions.add(
      new Conversion({ format: f })
    );
  });

[Noah-Sager]

Glad to hear it, and you're quite welcome. Feel free to mark the solution so other users know the question has been answered.