ZoomIn on click on the map

AkhilaM · ‎04-27-2020

When click on the zoomIn button(it should activate) and click on the map it should zoom in to that point (making on click point as center). I need to develop this with help of Javascript API.

Will you please help me with same ZoomOut as well.

Thanks.

@rscheitlin

ArcGIS API for JavaScript‌

RobertScheitlin__GISP · ‎04-28-2020

Akhila,

Here are the modifications to the previous sample I provided to do that:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no">
  <title>Navigation Toolbar - 4.15</title>
  <style>
    html,
    body,
    #viewDiv {
      padding: 0;
      margin: 0;
      height: 100%;
      width: 100%;
    }

    #tools {
      padding: 1em;
      text-align: center;
    }

    .tool {
      padding-top: 3px;
      padding: 4px 2px;
    }

    .tool.disabled,
    .tool.disabled:hover {
      opacity: 0.6;
      pointer-events: none;
    }

    .tool:hover,
    .tool.selected:hover {
      background-color: rgba(0, 0, 0, 0.5);
    }

    .tool.selected {
      background-color: rgba(0, 0, 0, 0.3);
    }
  </style>

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

  <script>
    var _prevExtent, _preExtent,
    _currentvExtent, _extentHistory,
    evtViewDragHandler, evtViewKeyDownHandler, draw,
    fullExtent
    require([
      "esri/Map",
      "esri/views/MapView",
      "esri/core/watchUtils",
      "dojo/dom-class",
      "dojo/dom",
      "dojo/on",
      "esri/views/2d/draw/Draw",
      "esri/geometry/Extent",
      "esri/geometry/Point",
      "esri/Graphic"
    ], function(Map, MapView, watchUtils, domClass, dom, on, Draw, Extent, Point, Graphic) {
      _prevExtent = false;
      _preExtent = null;
      _currentExtent = null;
      _extentHistory = [];
      _extentHistoryIndx = 0;
      _nextExtent = false;
      var map = new Map({
        basemap: "streets"
      });

      var view = new MapView({
        container: "viewDiv",
        map: map,
        zoom: 4,
        center: [15, 65] // longitude, latitude
      });

      watchUtils.whenTrue(view, "ready", function(){
        fullExtent = view.extent.clone();
        draw = new Draw({
          view: view
        });
        initToolbar();
        watchUtils.whenOnce(view, "extent", function(){
          watchUtils.when(view, 'stationary', function(evt){
            if(evt){
              extentChangeHandler(view.extent);
            }
          });
        });
      });

      function extentChangeHandler(evt) {
        if(_prevExtent || _nextExtent){
          _currentExtent = evt;
        }else{
          _preExtent = _currentExtent;
          _currentExtent = evt;
          _extentHistory.push({
            preExtent: _preExtent,
            currentExtent: _currentExtent
          });
          _extentHistoryIndx = _extentHistory.length - 1;
        }
        _prevExtent = _nextExtent = false;
        extentHistoryChange();
      }

      function extentHistoryChange() {
        if(_extentHistory.length === 0 || _extentHistoryIndx === 0 ){
          domClass.add(dom.byId("zoomprev"), "disabled");
        } else {
          domClass.remove(dom.byId("zoomprev"), "disabled");
        }
        if(_extentHistory.length === 0 || _extentHistoryIndx === _extentHistory.length - 1){
          domClass.add(dom.byId("zoomnext"), "disabled");
        } else {
          domClass.remove(dom.byId("zoomnext"), "disabled");
        }
      }

      function enableViewPanning() {
        if(evtViewDragHandler){
          evtViewDragHandler.remove();
          evtViewDragHandler = null;
        }
        if(evtViewKeyDownHandler){
          evtViewKeyDownHandler.remove();
          evtViewKeyDownHandler = null;
        }
      }

      function disableViewPanning() {
        if(evtViewDragHandler){
          evtViewDragHandler.remove();
          evtViewDragHandler = null;
        }
        if(evtViewKeyDownHandler){
          evtViewKeyDownHandler.remove();
          evtViewKeyDownHandler = null;
        }
        evtViewDragHandler = view.on("drag", function(event) {
          // prevents panning with the mouse drag event
          event.stopPropagation();
        });

        evtViewKeyDownHandler = view.on("key-down", function(event) {
          // prevents panning with the arrow keys
          var keyPressed = event.key;
          if (keyPressed.slice(0, 5) === "Arrow") {
            event.stopPropagation();
          }
        });
      }

      function displayCrosshairCursor() {
        this.view && this.view.container && this.view.container.style && "crosshair" !== this.view.container.style.cursor && (this.view.container.style.cursor = "crosshair")
      }
      function displayPointerCursor() {
        this.view && this.view.container && this.view.container.style && "pointer" !== this.view.container.style.cursor && (this.view.container.style.cursor = "pointer")
      }
      function displayDefaultCursor() {
        this.view && this.view.container && this.view.container.style && "default" !== this.view.container.style.cursor && (this.view.container.style.cursor = "default")
      }

      function removeCurrentSelTool() {
        view.popup.close();
        domClass.remove(dom.byId("panmap"), "selected");
        domClass.remove(dom.byId("zoomin"), "selected");
        domClass.remove(dom.byId("zoomout"), "selected");
      }

      function drawRect(event){
        var vertices = event.vertices;
        //remove existing graphic
        view.graphics.removeAll();
        if(vertices.length < 2){
          return;
        }

        // create a new extent
        var extent = getExtentfromVertices(vertices);

        var graphic = new Graphic({
          geometry: extent,
          symbol: {
            type: "simple-fill", // autocasts as SimpleFillSymbol
            color: [0, 0, 0, 0.3],
            style: "solid",
            outline: { // autocasts as SimpleLineSymbol
              color: [255, 0, 0],
              width: 1
            }
          }
        });

        view.graphics.add(graphic);
      }

      function zoomIn(evt){
        draw.reset();
        view.graphics.removeAll();
        var action = draw.create("rectangle");
        view.focus();
        action.on("vertex-add", drawRect);
        action.on("draw-complete", zoomIn);
        action.on("cursor-update", drawRect);
        if(evt.vertices.length === 1){
          var pnt  = new Point({x: evt.vertices[0][0], y: evt.vertices[0][1], spatialReference: view.spatialReference});
          view.goTo({target: pnt, scale: (view.scale * .5)});
          return;
        }
        var extent = getExtentfromVertices(evt.vertices);
        if (extent.width !== 0 || extent.height !== 0){
          view.goTo(extent);
        }
      }

      function zoomOut(evt){
        var vertices = evt.vertices;
        draw.reset();
        view.graphics.removeAll();
        var action = draw.create("rectangle");
        view.focus();
        action.on("vertex-add", drawRect);
        action.on("draw-complete", zoomOut);
        action.on("cursor-update", drawRect);
        if(evt.vertices.length === 1){
          var pnt  = new Point({x: evt.vertices[0][0], y: evt.vertices[0][1], spatialReference: view.spatialReference});
          view.goTo({target: pnt, scale: (view.scale * 2)});
          return;
        }
        var sx = vertices[0][0], sy = vertices[0][1];
        var ex = vertices[1][0], ey = vertices[1][1];
        var rect = {
          x: Math.min(sx, ex),
          y: Math.max(sy, ey),
          width: Math.abs(sx - ex),
          height: Math.abs(sy - ey),
          spatialReference: view.spatialReference
        };
        if (rect.width !== 0 || rect.height !== 0){
          var scrPnt1 = view.toScreen(rect);
          var scrPnt2 = view.toScreen({x: rect.x + rect.width, y: rect.y, spatialReference: rect.spatialReference});
          var mWidth = view.extent.width;
          var delta = (mWidth * view.width / Math.abs(scrPnt2.x - scrPnt1.x) - mWidth) / 2;
          var vExtent = view.extent;
          view.goTo(new Extent({
            xmin: vExtent.xmin - delta,
            ymin: vExtent.ymin - delta,
            xmax: vExtent.xmax + delta,
            ymax: vExtent.ymax + delta,
            spatialReference: vExtent.spatialReference
          }));
        }
      }

      function getExtentfromVertices(vertices){
        var sx = vertices[0][0], sy = vertices[0][1];
        var ex = vertices[1][0], ey = vertices[1][1];
        var rect = {
          x: Math.min(sx, ex),
          y: Math.max(sy, ey),
          width: Math.abs(sx - ex),
          height: Math.abs(sy - ey),
          spatialReference: view.spatialReference
        };
        if (rect.width !== 0 || rect.height !== 0){
          return new Extent({
            xmin: parseFloat(rect.x),
            ymin: parseFloat(rect.y) - parseFloat(rect.height),
            xmax: parseFloat(rect.x) + parseFloat(rect.width),
            ymax: parseFloat(rect.y),
            spatialReference: rect.spatialReference
          });
        }else{
          return null;
        }
      }

      function initToolbar() {
        on(dom.byId("zoomfull"), "click", function() {
          view.goTo( fullExtent);
        });
        on(dom.byId("zoomnext"), "click", function() {
          _nextExtent = true;
          _extentHistoryIndx++;
          view.goTo(_extentHistory[_extentHistoryIndx].currentExtent);
        });
        on(dom.byId("zoomprev"), "click", function() {
          if(_extentHistory[_extentHistoryIndx].preExtent){
            _prevExtent = true;
            view.goTo(_extentHistory[_extentHistoryIndx].preExtent);
            _extentHistoryIndx--;
          }
        });
        on(dom.byId("zoomin"), "click", function() {
          removeCurrentSelTool();
          disableViewPanning();
          view.graphics.removeAll();
          var action = draw.create("rectangle");
          displayCrosshairCursor();
          view.focus();
          action.on("vertex-add", drawRect);
          action.on("draw-complete", zoomIn);
          action.on("cursor-update", drawRect);
          domClass.add(dom.byId("zoomin"), "selected");
        });
        on(dom.byId("zoomout"), "click", function() {
          removeCurrentSelTool();
          disableViewPanning();
          view.graphics.removeAll();
          var action = draw.create("rectangle");
          displayCrosshairCursor();
          view.focus();
          action.on("vertex-add", drawRect);
          action.on("draw-complete", zoomOut);
          action.on("cursor-update", drawRect);
          domClass.add(dom.byId("zoomout"), "selected");
        });
        on(dom.byId("panmap"), "click", function() {
          removeCurrentSelTool();
          enableViewPanning();
          displayDefaultCursor();
          draw.reset();
          domClass.add(dom.byId("panmap"), "selected");
        });
      }
      view.ui.add("tools", "top-right");
    });
  </script>
</head>

<body>
  <div id="viewDiv"></div>
  <div id="tools" class="esri-widget">
    <img src="images/esriZoomIn.png" alt="Zoom In" title="Zoom In" class="tool" id="zoomin" />
    <img src="images/esriZoomOut.png" alt="Zoom Out" title="Zoom Out" class="tool" id="zoomout" />
    <img src="images/esriPan.png" alt="Pan Map" title="Pan Map" class="tool selected" id="panmap" />
    <img src="images/esriZoomFullExtent.png" alt="Full Extent" title="Full Extent" class="tool" id="zoomfull" />
    <img src="images/backward.png" alt="Back Extent" title="Back Extent" class="tool" id="zoomprev" />
    <img src="images/forward.png" alt="Forward Extent" title="Forward Extent" class="tool" id="zoomnext" />
  </div>
</body>
</html>
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