topic How to Clear Graphic from layer in ArcGIS JavaScript Maps SDK Questions

How to Clear Graphic from layer

SaihaniIdaffieSaidin — Fri, 13 May 2022 09:07:00 GMT

Hi kindly please help,

I am new to the ArcGis, I have added a button to clear graphic, but fail to do so.

I have tried using

map.graphics.removeAll(); or graphicsLayer.removeAll();

but still fail to do so. below is the code

<!DOCTYPE html>

<html>

<head>

<title>Create circles</title>

<style>

html, body, #map {

height: 100%; width: 100%; margin: 0; padding: 0;

}

#controls {

background: #fff;

box-shadow: 0 6px 6px -6px #999;

color: #444;

font-family: sans-serif;

height: auto;

left: 1em;

padding: 1em;

position: absolute;

top: 1em;

width: auto;

z-index: 40;

}

#controls div {

padding: 0 0 1em 0;

}

</style>

var map;

require([

"esri/map", "esri/geometry/Circle", "esri/symbols/SimpleFillSymbol",

"esri/graphic", "esri/layers/GraphicsLayer",

"dojo/dom", "dojo/on", "dojo/dom-attr", "dojo/domReady!"

], function(

Map, Circle, SimpleFillSymbol,

Graphic, GraphicsLayer, on,

dom, domAttr

) {

//Setup button click handlers

on(dom.byId("clearGraphics"), "click", function(){

if(map){

// map.graphics.removeAll();

graphicsLayer.removeAll();

}

});

map = new Map("map", {

basemap: "topo-vector",

center: [-120.741, 56.39],

slider: false,

zoom: 5

});

var symbol = new SimpleFillSymbol().setColor(null).outline.setColor("blue");

var gl = new GraphicsLayer({ id: "circles" });

var geodesic = dom.byId("geodesic");

map.addLayer(gl);

map.on("click", function(e) {

var radius = map.extent.getWidth() / 10;

var circle = new Circle({

center: e.mapPoint,

geodesic: domAttr.get(geodesic, "checked"),

radius: radius

});

var graphic = new Graphic(circle, symbol);

gl.add(graphic);

});

</script>

</head>

<body>

<div>Click the map.</div>

<label for="geodesic">Geodesic?</label><br />

<button type="button" id="clearGraphics">Clear Graphics</button>

</div>

</body>

</html>

any advise.

Thank you and regards

Re: How to Clear Graphic from layer

JeffreyWilkerson — Fri, 13 May 2022 15:03:27 GMT

You have the Dojo 'On' and 'Dom' calls in your require backwards. In your 'on click' function you call a non-existent graphics layer as you called it 'gl' at the root. And for a 3X library you should be using 'clear()' instead of 'removeAll()' which is from the 4x library. I would recommend you move all of this to the 4x library as it is easily done there as well. This works:

<!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <meta name="viewport" content="initial-scale=1, maximum-scale=1, user-scalable=no"> <title>Create circles</title> <link rel="stylesheet" href="https://js.arcgis.com/3.40/esri/css/esri.css"> <style> html, body, #map { height: 100%; width: 100%; margin: 0; padding: 0; } #controls { background: #fff; box-shadow: 0 6px 6px -6px #999; color: #444; font-family: sans-serif; height: auto; left: 1em; padding: 1em; position: absolute; top: 1em; width: auto; z-index: 40; } #controls div { padding: 0 0 1em 0; } </style> <script src="https://js.arcgis.com/3.40/"></script> <script> var map; require([ "esri/map", "esri/geometry/Circle", "esri/symbols/SimpleFillSymbol", "esri/graphic", "esri/layers/GraphicsLayer", "dojo/dom", "dojo/on", "dojo/dom-attr", "dojo/domReady!" ], function ( Map, Circle, SimpleFillSymbol, Graphic, GraphicsLayer, dom, on, domAttr ) { //Setup button click handlers on(dom.byId("clearGraphics"), "click", function () { if (map) { // map.graphics.removeAll(); gl.clear(); //removeAll(); } }); map = new Map("map", { basemap: "topo-vector", center: [-120.741, 56.39], slider: false, zoom: 5 }); var symbol = new SimpleFillSymbol().setColor(null).outline.setColor("blue"); var gl = new GraphicsLayer({ id: "circles" }); var geodesic = dom.byId("geodesic"); map.addLayer(gl); map.on("click", function (e) { var radius = map.extent.getWidth() / 10; var circle = new Circle({ center: e.mapPoint, geodesic: domAttr.get(geodesic, "checked"), radius: radius }); var graphic = new Graphic(circle, symbol); gl.add(graphic); }); }); </script> </head> <body> <div id="map"></div> <div id="controls"> <div>Click the map.</div> <input type="checkbox" id="geodesic"> <label for="geodesic">Geodesic?</label><br /> <button type="button" id="clearGraphics">Clear Graphics</button> </div> </body> </html>

Re: How to Clear Graphic from layer

SaihaniIdaffieSaidin — Wed, 18 May 2022 03:08:45 GMT

thank you very much Sir, for your advise,

I will look into 4x library for my code.