Create point using Sketch

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05-12-2020 05:20 AM
MagdalenaChmura
New Contributor

Hi,

I am using Sketch Widget to create point on map. 

Is there any way to allow user create only ONE point using Sketch?

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1 Solution

Accepted Solutions
RobertScheitlin__GISP
MVP Esteemed Contributor

Magdelena,

  Sure here is a sample for that. (Updated based on Undral's suggestion)

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8" />
    <meta
      name="viewport"
      content="initial-scale=1,maximum-scale=1,user-scalable=no"
    />
    <title>Sketch widget - 4.15</title>

    <link
      rel="stylesheet"
      href="https://js.arcgis.com/4.15/esri/themes/light/main.css"
    />
    <script src="https://js.arcgis.com/4.15/"></script>

    <style>
      html,
      body,
      #viewDiv {
        padding: 0;
        margin: 0;
        height: 100%;
        width: 100%;
      }
    </style>
    <script>
      require([
        "esri/widgets/Sketch",
        "esri/Map",
        "esri/layers/GraphicsLayer",
        "esri/views/MapView"
      ], function(Sketch, Map, GraphicsLayer, MapView) {
        const layer = new GraphicsLayer();

        const map = new Map({
          basemap: "streets",
          layers: [layer]
        });

        const view = new MapView({
          container: "viewDiv",
          map: map,
          zoom: 5,
          center: [90, 45]
        });

        const sketch = new Sketch({
          layer: layer,
          view: view,
          creationMode: "single"
        });

        view.ui.add(sketch, "top-right");
        
        sketch.on('create', function(evt){
          let pntCnt = 0, pntArr = [];
          if(evt.state === 'complete' && evt.tool === 'point'){
            sketch.layer.graphics.map(function(gra){
              if(gra.geometry.type === 'point'){
                pntCnt++;
                if(pntCnt > 1){
                  pntArr.push(gra);
                }
              }
            });
            if(pntCnt > 1){
              pntArr.map(function(pgra){
                sketch.layer.remove(pgra);
              })
              alert('only one point is allowed');
            }
          }
        })
      });
    </script>
  </head>

  <body>
    <div id="viewDiv"></div>
  </body>
</html>
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View solution in original post

2 Replies
RobertScheitlin__GISP
MVP Esteemed Contributor

Magdelena,

  Sure here is a sample for that. (Updated based on Undral's suggestion)

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8" />
    <meta
      name="viewport"
      content="initial-scale=1,maximum-scale=1,user-scalable=no"
    />
    <title>Sketch widget - 4.15</title>

    <link
      rel="stylesheet"
      href="https://js.arcgis.com/4.15/esri/themes/light/main.css"
    />
    <script src="https://js.arcgis.com/4.15/"></script>

    <style>
      html,
      body,
      #viewDiv {
        padding: 0;
        margin: 0;
        height: 100%;
        width: 100%;
      }
    </style>
    <script>
      require([
        "esri/widgets/Sketch",
        "esri/Map",
        "esri/layers/GraphicsLayer",
        "esri/views/MapView"
      ], function(Sketch, Map, GraphicsLayer, MapView) {
        const layer = new GraphicsLayer();

        const map = new Map({
          basemap: "streets",
          layers: [layer]
        });

        const view = new MapView({
          container: "viewDiv",
          map: map,
          zoom: 5,
          center: [90, 45]
        });

        const sketch = new Sketch({
          layer: layer,
          view: view,
          creationMode: "single"
        });

        view.ui.add(sketch, "top-right");
        
        sketch.on('create', function(evt){
          let pntCnt = 0, pntArr = [];
          if(evt.state === 'complete' && evt.tool === 'point'){
            sketch.layer.graphics.map(function(gra){
              if(gra.geometry.type === 'point'){
                pntCnt++;
                if(pntCnt > 1){
                  pntArr.push(gra);
                }
              }
            });
            if(pntCnt > 1){
              pntArr.map(function(pgra){
                sketch.layer.remove(pgra);
              })
              alert('only one point is allowed');
            }
          }
        })
      });
    </script>
  </head>

  <body>
    <div id="viewDiv"></div>
  </body>
</html>
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UndralBatsukh
Esri Regular Contributor

Hi there, 

There is a sample as Robert Scheitlin, GISP‌ pointed out. The sample will let you create a point and will select it for an update operation once it is created. If you just want to create it then you can set the sketch.creationMode property to single. Please refer to the Sketch.creationMode for possible values you can set for it. 

-Undral