topic Re: How do I turn on layers in the Layerlist widget when I open another? in Web AppBuilder Custom Widgets Questions

How do I turn on layers in the Layerlist widget when I open another?

LeiZhou1 — Mon, 04 Apr 2016 15:17:07 GMT

I want to set two layers A and B in the swipe widget for comparison, once the widget is open, these two layers are automatically turned on. Layer A is set as my default swipe layer. I guess my question is that how do I turn on both layers in the layer list widget everytime when I open the swipe widget? Thanks!

Re: How do I turn on layers in the Layerlist widget when I open another?

RobertScheitlin__GISP — Mon, 04 Apr 2016 15:28:38 GMT

Lei,

This thread should help:

Make layer visible after LayerList widget has opened

Re: How do I turn on layers in the Layerlist widget when I open another?

LeiZhou1 — Mon, 04 Apr 2016 15:57:05 GMT

I put codes in the file widget.js of the Layer List widget as the following, but it seems nothing happen. Could you please have a look at it? Thanks a lot!

onReceiveData: function (name, widgets_Swipe_Widget_52, data, historyData) {

//this makes sure that it is your event that you are reacting to and not another

if(name === 'Swipe' && data.hasOwnProperty('message')){

this.operLayerInfos.getLayerInfoById('Land_Use_2040_1084').setTopLayerVisible(true);

//this causes the layer list widget to redraw and show that the layers are turned off

this._clearLayers();

this.showLayers();

} // if statement ends

//RJS End Add

Re: How do I turn on layers in the Layerlist widget when I open another?

RobertScheitlin__GISP — Mon, 04 Apr 2016 16:26:07 GMT

Lei,

And are you dispatching the this.publishData in the swipe widget?

this.publishData({

message: someObject

});

Re: How do I turn on layers in the Layerlist widget when I open another?

LeiZhou1 — Mon, 04 Apr 2016 16:43:49 GMT

I also tried this following. I download the file from Developer Edition and then work on it. Should I work in the directory: arcgis-web-appbuilder-1.3\client\stemapp ?Thanks!

onReceiveData: function (name, widgetId, data, historyData) {

//this makes sure that it is your event that you are reacting to and not another

if(name === 'Swipe'){

this.operLayerInfos.getLayerInfoById('Land_Use_2040_1084').setTopLayerVisible(true);

this._clearLayers();

this.showLayers();

} // if statement ends

//RJS End Add

Re: How do I turn on layers in the Layerlist widget when I open another?

LeiZhou1 — Mon, 04 Apr 2016 16:45:30 GMT

No, I didnot. So about this someOject, what message should I insert? Is there any sample for this? Thanks!

Re: How do I turn on layers in the Layerlist widget when I open another?

RobertScheitlin__GISP — Mon, 04 Apr 2016 16:59:02 GMT

Lei,

I do all my development in a specific app when I am working on a widget (i.e. arcgis-web-appbuilder-1.3\server\apps\[app#]\widgets).

Re: How do I turn on layers in the Layerlist widget when I open another?

RobertScheitlin__GISP — Mon, 04 Apr 2016 16:59:47 GMT

Lei,

You ca set it to anything or just a empty string if you don't have anything you want to pass.

Re: How do I turn on layers in the Layerlist widget when I open another?

LeiZhou1 — Mon, 04 Apr 2016 17:14:50 GMT

Hi, Robert,

I insert these line to Swipe widget

_onPublishClick: function() {

this.publishData({

message: ''

});

I also insert alert statement in LayerList like this: onReceiveData: function (name, widgetId, data, historyData) { alert("Receive something here"); ....... }

It seems the layerlist does receive anything, otherwise the alert pop up should display. I really want this to happen, could you please give me some hints? Many thanks!

Re: How do I turn on layers in the Layerlist widget when I open another?

LeiZhou1 — Mon, 04 Apr 2016 17:39:28 GMT

I work something out. But it seems I have to open layer list widget first, otherwise the swipe widget does not send anything to LayerWidget. Can I make the layer visible without open the LayerList Widget? Thanks!

Re: How do I turn on layers in the Layerlist widget when I open another?

RobertScheitlin__GISP — Mon, 04 Apr 2016 18:01:14 GMT

Lei,

in the startup of the LayerList widget add

this.fetchData();

Re: How do I turn on layers in the Layerlist widget when I open another?

LeiZhou1 — Mon, 04 Apr 2016 19:41:56 GMT

Hi, Robert,

Does the following codes look OK to you? I inserted it to Swipe widget js file, but the alert statement does not show up. Why it does not send out anything? Thanks!

_onPublishClick: function() {

alert("Sending out message");

this.publishData({

message: ''

});

Re: How do I turn on layers in the Layerlist widget when I open another?

RobertScheitlin__GISP — Tue, 05 Apr 2016 00:04:10 GMT

Lei,

So what is calling _onPublishClick in the swipe widget? I would have just added

this.publishData({

message: ''

});

to the onOpen function.

Re: How do I turn on layers in the Layerlist widget when I open another?

LeiZhou1 — Tue, 05 Apr 2016 17:01:02 GMT

I will keep working on it. Thanks a lot for your advise!

Re: How do I turn on layers in the Layerlist widget when I open another?

VickyShen — Mon, 08 Mar 2021 20:51:37 GMT

I followed the solution to add the code like this. It is not working. Is it correct I added the code? Thank you all!

onOpen: function () {

this.publishData({

message: 'Please turn on Aerials 2019 and Aerials 1951 layers'

});

if (true === this._isTestSizeFlag) {
return;//skip first on-open(1st open called from jimu)
}

//re-create
this._loadLayerInfos().then(lang.hitch(this, function () {
var layerInfos = utils.getVisibleLayerInfos(this.layerInfosObj);

this.setDefaultOptions(layerInfos);

this.createSwipeDijit(/*selected*/);

// this.a11y_updateFocusNodes({isFouceToFirstNode: true});
}));
},