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filtering.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="initial-scale=1, maximum-scale=1,user-scalable=no">
<title>StreamLayer-Filtering</title>
<link rel="stylesheet" href="https://js.arcgis.com/3.16/esri/css/esri.css">
<style type="text/css">
html, body {
height: 100%; width: 100%;
margin: 0; padding: 0;
overflow: hidden;
}
.banner {
margin-top: 5px;
margin-bottom: 5px;
color: #000080;
font-size: 2em;
font-weight: bold;
}
.bordered{
border-color: #dcdcdc;
border-style: solid;
border-width: thin;
padding: 10px;
}
.connected {
background-color: #008000;
}
.control{
float: left;
width: 25%;
height:75px;
text-align: center;
text-wrap: normal;
}
.disconnected {
background-color: #800010;
}
.padded {
margin-left: 10px;
padding-top: 10px;
}
#mapDiv {
width: 100%;
height: 65%;
}
#txtWhere {
width: 300px;
}
#txtWsUrl {
width: 700px;
color: #ffffff;
}
</style>
<script src="https://js.arcgis.com/3.16/"></script>
</head>
<body>
<div class="banner">
Stream Layer: Filtering
</div>
<div id="mapDiv"></div>
<div class="padded">
<input type="text" id="txtWsUrl" class="disconnected" /><br>
<input type="button" id="cmdToggleStream" value="Make Stream Layer" />
</div>
<div class="padded" id="divFilterControls" style="position: relative;">
<div class="control bordered">
<span>Draw extent to filter messages by a bounding box</span><br>
<input type="button" id="cmdToggleSpatialFilter" value="Draw Extent" disabled="disabled" /><br>
</div>
<div class="control bordered">
<span>Enter Where Clause</span><br>
<input type="text" id="txtWhere" value="AltitudeFeet < 30000">
<input type="button" id="cmdToggleWhereFilter" value="Apply Where" disabled="disabled" /><br>
</div>
</div>
</body>
<script>
require([
"esri/map",
"esri/layers/StreamLayer",
"esri/toolbars/draw",
"esri/InfoTemplate",
"esri/graphic",
"esri/symbols/SimpleFillSymbol",
"esri/symbols/SimpleLineSymbol",
"dojo/_base/Color",
"dojo/on",
"dojo/dom",
"dojo/dom-class",
"dojo/domReady!"
], function(Map, StreamLayer,
Draw,
InfoTemplate,
Graphic,
SimpleFillSymbol, SimpleLineSymbol,
Color, on, dom, domClass) {
var streamLayer;
var url = "http://ec2-75-101-155-202.compute-1.amazonaws.com:6080/arcgis/rest/services/AsdiTracks/StreamServer";
var map = new Map("mapDiv", {
basemap: "gray",
center: [-90, 40],
zoom: 3
});
var drawTools = new Draw(map);
dom.byId("txtWsUrl").value = url;
//connect click events to UI buttons
on(dom.byId("cmdToggleStream"), "click", toggleStreamLayer);
on(dom.byId("cmdToggleSpatialFilter"), "click", toggleSpatialFilter);
on(dom.byId("cmdToggleWhereFilter"), "click", toggleWhereFilter);
on(drawTools, "draw-end", function(evt){
drawTools.deactivate();
setSpatialFilter(evt.geometry);
});
/**********************************************************************************************
*
* Functions to add and remove Stream Layer
*
**********************************************************************************************/
function toggleStreamLayer(){
if(streamLayer){
removeStreamLayer();
}
else{
addStreamLayer();
}
}
function addStreamLayer(){
//url to stream service
var svcUrl = dom.byId("txtWsUrl").value;
//construct Stream Layer
streamLayer = new StreamLayer(svcUrl, {
purgeOptions: {
displayCount: 10000
},
infoTemplate: new InfoTemplate("Attributes", "${*}")
});
streamLayer.on("connect", processConnect);
streamLayer.on("disconnect", processDisconnect);
streamLayer.on("filter-change", processFilterChange);
streamLayer.on("error", function(err){
console.log("error: ", err);
});
map.addLayer(streamLayer);
}
function removeStreamLayer(){
if (streamLayer){
map.removeLayer(streamLayer);
streamLayer = null;
map.graphics.clear();
}
}
/*********************************************************
*
* Stream layer event handlers
*
*********************************************************/
function processConnect(){
dom.byId("cmdToggleStream").value = "Remove Stream Layer";
domClass.replace("txtWsUrl", "connected", "disconnected");
dom.byId("cmdToggleSpatialFilter").value = "Draw Extent";
dom.byId("cmdToggleSpatialFilter").disabled = false;
dom.byId("cmdToggleWhereFilter").value = "Apply Where";
dom.byId("cmdToggleWhereFilter").disabled = false;
}
function processDisconnect(){
dom.byId("cmdToggleStream").value = "Add Stream Layer";
domClass.replace("txtWsUrl", "disconnected", "connected");
dom.byId("cmdToggleSpatialFilter").disabled = true;
dom.byId("cmdToggleWhereFilter").disabled = true;
}
function processFilterChange(evt){
console.log("filter-change: ", evt);
if(evt.error){
console.log("Could not set filter: ", evt.error);
return;
}
//clear layer graphics
streamLayer.clear();
//the event contains a filter property that is the current filter set on the service
//update map graphic to show current spatial filter
var filter = evt.filter || {};
var bbox = filter.geometry;
map.graphics.clear();
if(bbox){
map.graphics.add(new Graphic(bbox,
new SimpleFillSymbol(SimpleFillSymbol.STYLE_NULL,
new SimpleLineSymbol(SimpleLineSymbol.STYLE_SOLID,
new Color( [5, 112, 176] ), 2),
new Color( [5, 112, 176, 0] ))));
}
dom.byId("cmdToggleSpatialFilter").value = bbox ?
"Clear Spatial Filter" :
"Draw Extent";
dom.byId("cmdToggleWhereFilter").value = filter.where ?
"Clear Where" :
"Apply Where";
}
/**********************************************************************************************
*
* Functions to set and clear spatial filter
*
**********************************************************************************************/
function toggleSpatialFilter(){
if(!streamLayer){
return;
}
var currentSpatialFilter = streamLayer.getGeometryDefinition();
if (!currentSpatialFilter){
drawTools.activate(Draw.EXTENT);
}
else{
setSpatialFilter(null);
dom.byId("cmdToggleSpatialFilter").value = "Draw Extent";
}
}
//Set spatial filter on stream layer. Setting to null clears filter
function setSpatialFilter(bbox){
if (streamLayer){
streamLayer.setGeometryDefinition(bbox);
}
}
function toggleWhereFilter(){
if(!streamLayer){
return;
}
var currentWhereFilter = streamLayer.getDefinitionExpression();
if (!currentWhereFilter){
var where = dom.byId("txtWhere").value;
if(!where){
return;
}
streamLayer.setDefinitionExpression(where);
}
else{
streamLayer.setDefinitionExpression(null);
}
}
});
</script>
</html>