Add code to add the featureLayer to the map if it isn't already present. In the require statement, add a reference to the FeatureLayer, GraphicsLayer and Graphic modules. Try clicking on the map to see the features selected. Your app should look something like this. It returns a query object that already respect the layer's definitionExpressionif one is present. Properties:Example:// Once the layer loads, check if the// supportsAdd operations is enabled on the layerfeatureLayer.when(function(){ if (featureLayer.capabilities.operations.supportsAdd) { // if new features can be created in the layer // set … Properties:Example:// Once the layer loads, check if the// supportsAdd operations is enabled on the layerfeatureLayer.when(function(){ if (featureLayer.capabilities.operations.supportsAdd) { // if new features can be created in the layer // set … I'm having some trouble using the selectFeatures method with a feature layer. Define a sql variable and update the calls to queryFeatureLayer and queryFeatureLayerView to accept a SQL where clause and run the code again. What is the best approach to do this via ArcGIS Javascript API? This will search for and display features in the center of the map. ", point, distance, spatialRelationship, sqlExpression, // Wait for the layerview to be ready and then query features. ... ArcGIS Javascript API Feature Layer retrieval. hitTest returns features for all visible layers, so it is necessary to filter the results for the layer of interest. I think the problem is related to the matter that the feature layer is coming from a JSON, because if I create it from an ArcGIS Server URL I'm not able to reproduce the problem. Use ArcGIS Online to set the default styles and settings for feature layers. Applications can perform server-side or client-side SQL, spatial, and statistic queries to access and display data from feature layers. The createQuery() method is available as a convenience to the user. The ArcGIS API for JavaScript uses AMD modules. Use the queryFeatures method to execute the query. Add a simple popupTemplate to each graphic to show some trail information when they are clicked. Notice that all of the features draw because the layer is added to the map, but only the features returned from the query are added to the graphics layer. I'm having some difficulty getting the results from the query to be added to the map. Server-side Query: To request a subset of data from the server without adding the feature layer to a map, use the queryFeatures method on a FeatureLayer object. The FeatureLayerhas several methods for querying data. Copyright © 2021 Esri. hitTest returns features for all visible layers, so it is necessary to filter the results for the layer of interest. Query expressions in ArcGIS adhere to standard SQL expressions. // query all features from the oil and gas wells layerview.then(function() { returnwellsLayer.then(function() { varquery = … Query a FeatureLayer. Notice that only the features that match the query are displayed. A user provides input to the query. To learn how to access data using a SQL filter, visit the Filter a feature layer tutorial. Afterwards we zoom the map to the extent of the graphics. After the view and FeatureLayerView are ready, use hitTest to find features and show a pop-up when the cursor is over a feature. Define a function that accepts a point, distance to search, spatial relationship operator, and an optional SQL expression and builds a query that will return all of the fields and the geometry from the feature layer. Server-side Query: To request a subset of data from the server without adding the feature layer to a map, use the queryFeatures method on a FeatureLayer object. When I set a breakpoint before the last line(rl.addMany(features)), I see that features contains the expected feature, and the symbol is set properly. Query layers allow both spatial and nonspatial information stored in a database to be easily integrated into map service operations. Log in to create and rate content, and to follow, bookmark, and share content with other members. It returns a query object that already respect the layer's definitionExpression if one is present. queryFeatures. For example, you use this syntax using the Select By Attributes tool or with the Query Builder dialog box to set a layer definition query. Add the following code to show a pop-up as the cursor moves. Add the following code to show a pop-up as the cursor moves. The feature data in these layers is hosted by, or stored on, ArcGIS Online. Clear the graphics layer each time with removeAll. Counties: You will learn: how to build an app to perform either client-side or server-side SQL and spatial queries to access data. import { queryFeatures } from '@esri/arcgis-rest-feature-layer' ; // queryFeatures ( { url: "http://sampleserver6.arcgisonline.com/arcgis/rest/services/Census/MapServer/3" , where: "STATE_NAME = 'Alaska'" }) .then (result) Query a feature service. Your app should look something like this. To learn how to access data using a SQL filter, visit the Filter a feature layer tutorial. Learn more about the query parameters you can use in the documentation. In CodePen, click Fork and save the pen as ArcGIS JavaScript Tutorials: Query a feature layer. var layer = MyMapView.Map.Layers["MyLayer"] as FeatureLayer; var table = layer.FeatureTable; ((ServiceFeatureTable)table).Where = null; var task = new QueryTask(new Uri(((ServiceFeatureTable)table).ServiceUri)); var result = await task.ExecuteObjectIDsQueryAsync(new Query("closeddate > date '2012-12-01'")); if (result != null) capabilitiesObjectreadonly 1. ", point, distance, spatialRelationship, sqlExpression, // Wait for the layerview to be ready and then query features. These layers offer the most flexibility, scalability, and compatibility across ArcGIS. My scenario is that is a user scans a QR code on a mobile device, this then launches a webpage with JS map in it, and it then zooms in on the feature relating to the QR code they have scanned. Run the code and click on the map to query and draw features that are 1500 meters from the point. Both client-side and server-side queries can contain a SQL expression and/or a spatial relationship operator. The queryFeatures () method allows the user to query the features in a FeatureLayer based on an input query object. How it works. // query all features from the oil and gas wells layer view.when(function { return wellsLayer.when(function { var query = wellsLayer.createQuery(); return wellsLayer.queryFeatures(query); }); }); Setting the outFieldsof the query will limit the attributes returned from the query. For example, you use this syntax using the Select By Attributes tool or with the Query Builder dialog box to set a layer definition query . Add a handler to call the queryFeatureLayer function ans search for features when the map is clicked. Query expressions in ArcGIS adhere to standard SQL expressions. var query = new esri.tasks.Query(); query.geometry = area.geometry; var counter = 0; var listOfSelectedFeatures; for (var j = 0; j < map.graphicsLayerIds.length; j++) { var currentLayer = map.getLayer(map.graphicsLayerIds); currentLayer.selectFeatures(query, currentLayer.SELECTION_NEW, function { counter++; if (counter == (map.graphicsLayerIds.length - 1)) { for (var k = 0; k < map.graphicsLayerIds.length; k++) { var layer … To do so, the feature layer must be added to the map and the FeatureLayerView must be ready, in other words, the features and attributes have been loaded and can be queried. To query features based on attribute values, specify a SQL where clause in the where property. Another form of querying is to use the hitTest method on the view to find features at a given screen location. The queryIds method is used to query the feature layer and return the object ids for all the records that match the input query. Both the SQL filter selected and the spatial query will be applied so you should only see trailheads that have "Canyon" in their name. Since features can only be queried after the layer is loaded, use whenLayerView to ensure the layer is ready and is not being updated. I'm having some trouble using the selectFeatures method with a feature layer. Copyright © 2021 Esri. Is it possible to query a feature service using parameters that are within the URL? The require function is used to load modules so they can be used in the main function. Open the JavaScript Starter App on CodePen. In this tutorial, you will execute server-side and client-side queries to find trailheads that are within a distance of 1500 meters from the center of the map and where you click. When the features are returned, pass the results to the addGraphics function. Server-side queries can be executed against a feature layer as soon as it is created and the layer does not need to be added to the map. Update the view.when and view.on handlers to call the queryFeatureLayerView function and pass in the same parameters. When the view is ready, call the queryFeatureLayer function and pass in the center of the view, 1500 as the distance in meters, and intersects as the spatial relationship operator to use. It returns a query object that already respect the layer's definitionExpressionif one is present. QueryTask, Query, and FeatureSet are used together to query a layer in a map and display the results.. Now that the layer is created and we can add graphics, add code to execute the server-side query. The main difference between client-side and server-side queries is that client-side querying is only possible after the feature layer is added to a map and the attributes are present. Learn more about the query parameters you can use in the documentation. After you create a query layer, you can save it … The query operation is performed on a feature service layer resource.The result of this operation is either a feature set or an array of feature IDs (if returnIdsOnly is set to true) and/or a result extent (if returnExtentOnly is set to true).. Web feature layers (also known as feature services) are layers that are shared to support displaying, querying, and editing data on the web. Afterwards we zoom the map to the extent of the graphics. I am trying to find an example but the closest I can find is this Select with Feature Layer | ArcGIS API for JavaScript var query = new esri.tasks.Query(); query.geometry = area.geometry; var counter = 0; var listOfSelectedFeatures; for (var j = 0; j < map.graphicsLayerIds.length; j++) { var currentLayer = map.getLayer(map.graphicsLayerIds); currentLayer.selectFeatures(query, currentLayer.SELECTION_NEW, function { counter++; if (counter == (map.graphicsLayerIds.length - 1)) { for (var k = 0; k < … The queryFeatures()method allows the user to query the features in a FeatureLayer based on an input queryobject. Describes the layer's supported capabilities. Beyond spatial queries, you can also perform an attribute or a combination of attribute and spatial search queries with the queryFeatures function. Since features can only be queried after the layer is loaded, use whenLayerView to ensure the layer is ready and is not being updated. Applications can perform server-side or client-side SQL, spatial, and statistic queries to access and display data from feature layers. Define another function that accepts a point, distance to search, spatial relationship operator, and an optional SQL expression and builds a query that will return all of the fields and the geometry from the feature layer. The queryFeatures() method allows the user to query the features in a FeatureLayer based on an input query object. When the features are returned, pass the results to the addGraphics function. Here we create new graphics, define the symbol and popup template, and then add them to the graphics layer. My feature layer is about 150 points with attributes. The code below builds a query using input text. Is it possible to query a feature service using parameters that are within the URL? The createQuery()method is available as a convenience to the user. 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