topic Re: if nothing is selected select first value dropdown JQuery in ArcGIS JavaScript Maps SDK Questions

if nothing is selected select first value dropdown JQuery

AlexGole — Sat, 11 Dec 2021 22:42:45 GMT

Hi all,

I have multiple dropdowns from which I can select Township/range and section values that are used for queries. It does the job when I change the values of the drop downs but when nothing is selected (no change) in the drop down then NO value is selected. Any idea how to get the current value and then the onchange value if users change value on drop downs?

Query:

var picker1;
                         var picker2;
                         var picker3;
                         var picker4;
                         var picker5;




                         $("#selectpicker1").change(function () {
                             picker1 = this.value;
                             alert(this.value);
                         });
                         $("#selectpicker2").change(function () {
                             picker2 = this.value;
                             alert(this.value);
                         });
                         $("#selectpicker3").change(function () {
                             picker3 = this.value;
                             alert(this.value);
                         });
                         $("#selectpicker4").change(function () {
                             picker4 = this.value;
                             alert(this.value);
                         });
                         $("#selectpicker5").change(function () {
                             picker5 = this.value;
                             alert(this.value);
                         });





on(dom.byId("Query1"), "click", queryPLSS);
                         function queryPLSS() {
                             var queryTask = new QueryTask("http://webgisdevint1/arcgis/rest/services/ResourceMgmt/WatershedMapper10_2/MapServer/0");
                             queryTask.on("complete", addToMap);
                             var query = new Query();
                             query.returnGeometry = true;
                             query.outFields = ["TOWNSHIP", "RANGE", "SECTION"];
                             query.where = "TOWNSHIP='" + picker1 + picker2 + "' AND " + "RANGE='" + picker3 + picker4 + "' AND " + "SECTION=" + picker5;
                             query.outSpatialReference = map.spatialReference;
                             queryTask.execute(query, function (featureSet) {
                                 var AOI = featureSet.features[0].geometry;
                                 var graphic = new Graphic(AOI, symbol8);
                                 var features = [];
                                 features.push(graphic);
                                 var fSet = new FeatureSet();
                                 fSet.features = features;
                                 console.log("Querying...");
                             });

Thanks,

Alex

Re: if nothing is selected select first value dropdown JQuery

RobertScheitlin__GISP — Mon, 09 Nov 2015 17:37:37 GMT

Alex,

It should be as simple as

var picker1 = $("#selectpicker1").value;

Re: if nothing is selected select first value dropdown JQuery

KenBuja — Mon, 09 Nov 2015 17:42:22 GMT

Since the picker variables are only being set when a change occurs, you'll have to initialize the variables with the default (or current) value of the combo boxes.

var picker1 = $("#selectpicker1").value ;

Re: if nothing is selected select first value dropdown JQuery

AlexGole — Mon, 09 Nov 2015 17:50:45 GMT

var picker1 = $("#selectpicker1").val(); only selects the first value in the drop down. The change of value is not reflected.

Re: if nothing is selected select first value dropdown JQuery

RobertScheitlin__GISP — Mon, 09 Nov 2015 17:56:31 GMT

Alex,

That does not make sense as the code you have for the change event should allow for capturing the change made by the user.

Re: if nothing is selected select first value dropdown JQuery

AlexGole — Mon, 09 Nov 2015 18:04:03 GMT

Sorry, That was it. I made a mistake. Thank you Robert and Ken. That was a pretty straight forward solution that I did not get. Thanks again.