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How to prevent users from drawing a polygon or dropping the point outside South African borders?

1324
1
03-24-2021 11:48 PM
SiyabongaKubeka
Occasional Contributor

Hi All

I have this JavaScript code that displays an Esri map. The users of this map can draw a polygon and retrieve information like the coordinates, the province name, ward, local municipality and district municipality. Now I want to limit the users to only drawing the polygon inside South Africa only. If they draw the polygon outside the boarders, they should get an error message telling them that this is outside South Africa. How can I do that? Below is my code:

<html><head>
<meta charset="utf-8">
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no">

<title>GIS Map for CRM</title>

<link href="https://js.arcgis.com/4.14/esri/themes/light/main.css" rel="stylesheet">
<script src="https://js.arcgis.com/4.14/"></script>

<style>
html,
#viewDiv {
padding: 0;
margin: 0;
height: 100%;
width: 100%;
}

.esri-sketch__section.esri-sketch__tool-section:last-of-type {
display: none;
}

.esri-sketch__section.esri-sketch__tool-section:nth-child(2) {
border-right: none;
}
</style>
<script>
var lon;
var lat;
var crmLatitude;
var crmLongitude;
var latlon;
var provinces;
var municipalities;
var districts;
var wards;
var showWards = [];
var testVariable;
require([
"esri/Map",
"esri/views/MapView",
"esri/WebMap",
"esri/layers/FeatureLayer",
"esri/tasks/QueryTask",
"esri/tasks/support/Query",
"esri/config",
"esri/widgets/Sketch",
"esri/layers/GraphicsLayer"],



function(Map, MapView, WebMap, FeatureLayer, QueryTask, Query,
esriConfig, Sketch, GraphicsLayer) {
esriConfig.portalUrl = "https://portal.environment.gov.za/portal";

const featureLayerUrl = 'https://portal.environment.gov.za/server/rest/services/Boundary/Wards/MapServer/0';
var webmap = new WebMap({
portalItem: {
id: "04582be14885483da48f29398960f653"
}
});

var graphicsLayer = new GraphicsLayer();

var view = new MapView({
map: webmap,
container: "viewDiv",
popup: null
});

var featureLayer = new FeatureLayer({
url: featureLayerUrl
});

webmap.add(featureLayer);

webmap.layers.add(graphicsLayer);

var sketch = new Sketch({
layer: graphicsLayer,
view: view,
availableCreateTools: ["polygon"],
creationMode: "update",

});



view.ui.add(sketch, {
position: "top-right"
});


sketch.on('create', function (event) {
// check if the create event's state has changed to complete indicating
// the graphic create operation is completed.
if (event.state === "complete") {

if (view.zoom >= 11) {
let gra = event.graphic.clone();
event.graphic.layer.removeAll();
gra.symbol.color = "red";
gra.layer.add(gra);
console.log(view.zoom);
console.log("X = ", gra.geometry.x);
console.log("Y = ", gra.geometry.y);
console.log("Lat = ", event.graphic.geometry.latitude);
console.log("Long = ", event.graphic.geometry.longitude);
lat = event.graphic.geometry.latitude;
lon = event.graphic.geometry.longitude;
zoomLevel = view.zoom;
for (var i = 0; i < gra.geometry.rings.length; i++){
for (var p = 0; p < gra.geometry.rings[i].length; p++){
crmLatitude = String(gra.geometry.getPoint(i, p));
crmLongitude = String(gra.geometry.getPoint(i, p));
var LatLon = String(gra.geometry.rings[i][p]);
console.log(LatLon);
latlon = LatLon;
}
}
debugger;
}
else{
alert("please zoom in");
event.graphic.layer.remove(event.graphic);
}
}

});

view.on('click', function(event){
var queryTask = new QueryTask({
url: featureLayerUrl
});
var query = new Query();
query.geometry = view.toMap(event);
query.distance = 0;
query.units = "meters";
query.spatialRelationship = "intersects";
query.returnGeometry = true;
query.outFields = [ "PROVINCE", "DCS12_NAME", "S12_NAME", "WARD_NO" ];

queryTask.execute(query).then(function(results){

var feat = results.features[0];
provinces = feat.attributes.PROVINCE;
wards = feat.attributes.WARD_NO;
districts = feat.attributes.DCS12_NAME;
municipalities = feat.attributes.S12_NAME

showWards.push(wards);
var xwards = showWards.toString();

console.log(provinces);
console.log(wards);
console.log(districts);
console.log(municipalities);

console.log(xwards);

if(provinces === "Gauteng" || provinces === "Mpumalanga" || provinces === "Limpopo" || provinces === "North West" || provinces === "Northern Cape" || provinces === "Free State" || provinces === "Western Cape" || provinces === "Eastern Cape" || provinces === "KwaZulu-Natal")
{

//Call to CRM to populate the lookup field for Province

debugger;

window.parent.Xrm.WebApi.online.retrieveMultipleRecords("dea_province", "?$select=dea_name,dea_provinceid&$filter=dea_name eq '" + provinces + "'").then(
function success(results) {
debugger;
for (var i = 0; i < results.entities.length; i++) {
var dea_name = results.entities[i]["dea_name"];
var dea_provinceid = results.entities[i]["dea_provinceid"];

//Populate lookup
var lookupValue = new Array();
lookupValue[0] = new Object();
lookupValue[0].id = dea_provinceid; // GUID of the lookup id
lookupValue[0].name = dea_name; // Name of the lookup
lookupValue[0].entityType = "dea_province"; //Entity Type of the lookup entity
window.parent.Xrm.Page.getAttribute("dea_province").setValue(lookupValue);
}
},
function(error) {
Xrm.Utility.alertDialog(error.message);
}
);

//Call to CRM to populate the lookup field for the Local Municipality

window.parent.Xrm.WebApi.online.retrieveMultipleRecords("dea_localmunicipality", "?$select=dea_localmunicipalityid,dea_name&$filter=dea_name eq '" + municipalities + "'").then(
function success(results) {
for (var i = 0; i < results.entities.length; i++) {
var dea_localmunicipalityid = results.entities[i]["dea_localmunicipalityid"];
var dea_name = results.entities[i]["dea_name"];

//Populate lookup
var lookupValue = new Array();
lookupValue[0] = new Object();
lookupValue[0].id = dea_localmunicipalityid; // GUID of the lookup id
lookupValue[0].name = dea_name; // Name of the lookup
lookupValue[0].entityType = "dea_localmunicipality"; //Entity Type of the lookup entity
window.parent.Xrm.Page.getAttribute("dea_localmunicipality").setValue(lookupValue);
}
},
function(error) {
Xrm.Utility.alertDialog(error.message);
}
);

//Call to CRM to populate the lookup field for District Municipality

window.parent.Xrm.WebApi.online.retrieveMultipleRecords("dea_districtmunicipality", "?$select=dea_districtmunicipalityid,dea_name&$filter=dea_name eq '" + districts + "'").then(
function success(results) {
for (var i = 0; i < results.entities.length; i++) {
var dea_districtmunicipalityid = results.entities[i]["dea_districtmunicipalityid"];
var dea_name = results.entities[i]["dea_name"];

//Populate lookup
var lookupValue = new Array();
lookupValue[0] = new Object();
lookupValue[0].id = dea_districtmunicipalityid; // GUID of the lookup id
lookupValue[0].name = dea_name; // Name of the lookup
lookupValue[0].entityType = "dea_districtmunicipality"; //Entity Type of the lookup entity
window.parent.Xrm.Page.getAttribute("dea_districtmunicipality").setValue(lookupValue);
}
},
function(error) {
Xrm.Utility.alertDialog(error.message);
}
);

//Populate the coordinates field
debugger;
window.parent.Xrm.Page.getAttribute("dea_latitude").setValue(latlon);
window.parent.Xrm.Page.getAttribute("dea_longitude").setValue(latlon);
window.parent.Xrm.Page.getAttribute("dea_ward").setValue(xwards);
//THE END OF CALLS TO CRM
}
else{
alert("Polygon is drawn outside South Africa, please try again");
}
});

});
});


</script>
<meta><meta><meta><meta><meta><meta><meta><meta><meta><meta><meta><meta><meta><meta><meta><meta><meta><meta><meta><meta><meta><meta><meta><meta><meta><meta><meta></head>

<body style="overflow-wrap: break-word;">
<div id="viewDiv"></div>

</body></html>

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1 Reply
KenBuja
MVP Esteemed Contributor

You can use the geometryEngine's contains or intersects methods (or a combination of both) to determine if the sketched geometry is within your boundary. This sample shows one way to do that.

If you'd rather warn the user while drawing, you could use the Draw class (this sample provides feedback as the user draws a line)

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