How do I query a feature layer? ... All Places > Developer Communities > Web Developers > ArcGIS API for JavaScript > Questions. Use the queryFeatures method to execute the query. I'm wondering however whether I should be using a FeatureLayer with a Definition Expression, rather than the Query Task. Both client-side and server-side queries can contain a SQL expression and/or a spatial relationship operator. The graphics layer will be used to draw the features returned from the query. 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. It returns a query object that already respect the layer's definitionExpressionif one is present. Use the queryFeatures method to execute the query. The createQuery () method is available as a convenience to the user. 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. You can perform client-side queries against features that are displayed in the view. What is the best approach to do this via ArcGIS Javascript API? The queryIds method is used to query the feature layer and return the object ids for all the records that match the input query. To learn how to access data using a SQL filter, visit the Filter a feature layer tutorial. //queryFeatureLayer(view.center, 1500, "intersects"); //queryFeatureLayer(event.mapPoint, 1500, "intersects"); //queryFeatureLayer(view.center, 1500, "intersects"), //queryFeatureLayer(event.mapPoint, 1500, "intersects"), // Only return features for the feature layer, Display point, line, and polygon graphics. Create a feature layer for the trailheads so you can execute queries and a graphics layer to draw the features returned. Both the SQL filter selected and the spatial query will be applied so you should only see trailheads that have "Canyon" in their name. To learn how to build this app, visit the Create a starter app tutorial. 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. Log in to create and rate content, and to follow, bookmark, and share content with other members. Here we create new graphics, define the symbol and popup template, and then add them to the graphics layer. //queryFeatureLayer(view.center, 1500, "intersects"); //queryFeatureLayer(event.mapPoint, 1500, "intersects"); //queryFeatureLayer(view.center, 1500, "intersects"), //queryFeatureLayer(event.mapPoint, 1500, "intersects"), // Only return features for the feature layer. Indicates the layer's supported capabilities.Example:// Once the layer loads, check if the// supportsAdd operations is enabled on the layerfeatureLayer.then(function(){ if (featureLayer.capabilities.operations.supportsAdd) { // if new features can be created in the layer // set … Add the following code to show a pop-up as the cursor moves. All rights reserved. The query operation is performed on a feature service layer resource. Build an app to buffer, intersect, and preform distance calculations with the geometry engine. Instead, the token will be passed in POST request body or through X-Esri-Authorization header. Answered Assumed Answered. I'm having some trouble using the selectFeatures method with a feature layer. Learn more about the query parameters you can use in the documentation. This allows you to do the following: Query statistics for the clustered features. Using a Feature Layer would enable the drawing information from the server to be used. Query a FeatureLayer. 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. After the view and FeatureLayerView are ready, use hitTest to find features and show a pop-up when the cursor is over a feature. The require function is used to load modules so they can be used in the main function. Define an addGraphics function that will be used later to accept the return values from a query and add the results to the graphics layer. I am trying to find an example but the closest I can find is this Select with Feature Layer | ArcGIS API for JavaScript The FeatureLayer API provides a method called queryExtent(), which allows you to calculate the full extent of features at runtime that statisfy a given query. It returns a query object that already respect the layer's definitionExpression if one is present. If anyone has any pointers on what I could be doing wrong here, it'd be a huge help! Hi Guys, i need to retrieve unique values from a set of feature layers. Hosted feature layers are layers that have been published to ArcGIS Online. I am developing a web application (with ArcGIS Javascript 4.15) where I can click on a property. It can be convenient and useful for users to zoom to the extent of all features in a FeatureLayer once an app loads, when a layer is added to the map, or when a layer's definitionExpression is updated.. 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. Your app should look something like this. A user provides input to the query. When the features are returned, pass the results to the addGraphics function. What is the best approach to do this via ArcGIS Javascript API? If the result of the SQL query entered returns a spatial column, the output will be a feature layer. You can optionally use the text property for a LIKE statement. I'm working with the API for JavaScript to create a map of tornadoes in the US. Also, add logic to only show a pop-up when a new feature is found. 5. Display the visible extent of a cluster’s features. ... ArcGIS Javascript API Feature Layer retrieval. Since features can only be queried after the layer is loaded, use whenLayerView to ensure the layer is ready and is not being updated. 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 … Also, add logic to only show a pop-up when a new feature is found. The require function is used to load modules so they can be used in the main function. The ArcGIS API for JavaScript uses AMD modules. Setting the outFieldsof the query will limit the attributes returned from the query. When the features are returned, pass the results to the addGraphics function. 1. At the end of the code in the main function, create a FeatureLayer and set the url to access and query the trailheads feature layer, and then create a GraphicsLayer and add it to the map. Notice that only the features that match the query are displayed. 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 < … capabilitiesObjectreadonly 1. QueryTask, Query, and FeatureSet are used together to query a layer in a map and display the results.. Learn more about the parameters you can use in the documentation. A query table is a feature class or table defined by a SQL query on the fly. You can query features from clusters to get access to the underlying features represented by a cluster. For example, you can use whereto query all counties in the state of Washington from a layer representing U.S. QueryTask, Query, and FeatureSet are used together to query a layer in a map and display the results. In ArcGIS Desktop this is very easy, just go to select by location and then query the point feature layer to see when it intersects with the polygon feature layer. Browse other questions tagged javascript arcgis-server feature-layer arcgis-javascript-api-4 feature-service or ask your own question. 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. It's important to keep the module references and function parameters in the same order. 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. Add the following code to show a pop-up as the cursor moves. This will search for and display features in the center of the map. Beyond spatial queries, you can also perform an attribute or a combination of attribute and spatial search queries with the queryFeatures function. The input into the process is Query.A user provides input to the query. In the require statement, add a reference to the FeatureLayer, GraphicsLayer and Graphic modules. I'm using sliders and other inputs to allow the user to query the data client-side. Currently I have used a Query Task by specifying the layer, the "where" statement, graphic symbol, InfoTemplate etc. I have been stuck with an issue, that I thought will be simple to fix. Update the view.when and view.on handlers to call the queryFeatureLayerView function and pass in the same parameters. Applications can perform server-side or client-side SQL, spatial, and statistic queries to access and display data from feature layers. featureLayer.queryFeatures(query, function (featureSet) { for (var i = 0; i < featureSet.features.length; i++) { var feature = featureSet.features; geoms.push(feature.geometry); } union = geometryEngine.union(geoms); //console.log(union); var query2 = new Query(); query2.geometry = union; query2.spatialRelationship = Query.SPATIAL_REL_CONTAINS; The results contain features that you can turn into graphics. 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 added a function to get some feedback after the selection is complete. The createQuery()method is available as a convenience to the user. Query expressions in ArcGIS adhere to standard SQL expressions. I added a function to get some feedback after the selection is complete. Use ArcGIS Online to set the default styles and settings for feature layers. Add code to add the featureLayer to the map if it isn't already present. I am trying to find an example but the closest I can find is this Select with Feature Layer | ArcGIS API for JavaScript Set the graphic symbol color and outline width properties to create a black symbol with a cyan outline. // 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); }); }); 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. Learn more about the query parameters you can use in the documentation. The results contain features that you can turn into graphics. With hosted feature layers, you can do the following: Edit data in the field either online or offline using ArcGIS Survey123 or ArcGIS Collector. When the features are returned, pass the results to the addGraphics function. It returns a query object that already respect the layer's definitionExpressionif one is present. NOTE: This will force POST requests in browsers since auth header is not yet supported by … Also, below is my declaration of feature layer and graphics layer. Also, I know that the feature exists, but is not appearing on the map. hitTest returns features for all visible layers, so it is necessary to filter the results for the layer of interest. With hosted feature layers, you can do the following: The queryFeatures()method allows the user to query the features in a FeatureLayer based on an input queryobject. capabilities Objectreadonly 1. Query expressions are used in ArcGIS to select a subset of features and table records. Client-side Query: To access a subset of data on the client, you have to add the feature layer to a map first, and then use the queryFeatures method on a FeatureLayerView object. Try clicking on the map to see the features selected. This can improve the speed of the query if your app doesn't require all the attributes for each feature. 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. Create a feature layer for the trailheads so you can execute queries and a graphics layer to draw the features returned. | Privacy | Terms of use | FAQ, Map, MapView, FeatureLayer, GraphicsLayer, Graphic, "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Trailheads_Styled/FeatureServer/0", "This a {PARK_NAME} trail located in {CITY_JUR}. // query all features from the oil and gas wells layerview.then(function() { returnwellsLayer.then(function() { varquery = … In CodePen, click Fork and save the pen as ArcGIS JavaScript Tutorials: Filter a feature layer. Query expressions are used in ArcGIS to select a subset of features and table records. Query layers behave in the same way as other feature layers or stand-alone tables in a map; they can be used to display data, used as input to a geoprocessing tool, or accessed programmatically using developer APIs. The graphics layer will be used to draw the features returned from the query. After you create a query layer, you can save it … hitTest returns features for all visible layers, so it is necessary to filter the results for the layer of interest. 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. 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. Applications can perform server-side or client-side SQL, spatial, and statistic queries to access and display data from feature layers. ", 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. Web feature layers (also known as feature services) are layers that are shared to support displaying, querying, and editing data on the web. Now that the layer is created and we can add graphics, add code to execute the server-side query. Prevents the token from being passed in a URL Query param that is saved in browser history. In CodePen, click Fork and save the pen as ArcGIS JavaScript Tutorials: Query a feature layer. Open the JavaScript Starter App on CodePen. You will learn: how to build an app to perform either client-side or server-side SQL and spatial queries to access data. The ArcGIS API for JavaScript uses AMD modules. These layers offer the most flexibility, scalability, and compatibility across ArcGIS. The Overflow Blog Open source has a funding problem Copyright © 2021 Esri. The createQuery() method is available as a convenience to the user. My feature layer is about 150 points with attributes. 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 . The feature data in these layers is hosted by, or stored on, ArcGIS Online. If the user selects 'Query By Distance', two parameters, distance and units, are added to the query object that is the input for layer.queryFeatures(), returning any item in the feature that is within 0.5 miles from where the user clicked on the map. Client-side Query: To access a subset of data on the client, you have to add the feature layer to a map first, and then use the queryFeatures method on a FeatureLayerView object. Run the code and click on the map to search and display features that are 1500 meters from the point. Beyond spatial queries, you can also perform an attribute or a combination of attribute and spatial search queries with the queryFeatures function. From the geometry of the property, I am querying feature layers that are listed in an object and have using this topic to get some inpiration. A function calls queryObjectIds () whenever the user clicks on the map, which returns the objectId of the corresponding hexagon in the layer. This input might include selecting features on a map, selecting a value from a list, or typing in a value. In the require statement, add a reference to the FeatureLayer, GraphicsLayer and Graphic modules. The code below builds a query using input text. The FeatureLayerhas several methods for querying data. It returns a query object that already respect the layer's definitionExpression if one is present. In ArcGIS Desktop this is very easy, just go to select by location and then query the point feature layer to see when it intersects with the polygon feature layer. Run the code and click on the map to search and display features that are 1500 meters from the point. Since features can only be queried after the layer is loaded, use whenLayerView to ensure the layer is ready and is not being updated. Working with Feature Layers in the ArcGIS API for JavaScript ... Query the layer Attribute queries select only features passing a WHERE SQL clause Spatial queries select only features passing a spatial filter Statistic queries returns statistics about the selected features … Build an app that displays feature layers in a 2D map. layer.queryObjectIds ( { geometry: point, spatialRelationship: "intersects" , returnGeometry: false , outFields: [ "*" ] }) We highlight the hexagon, then use the queryRelatedFeatures () method to query for the related features attached to this object id. queryFeatures. In CodePen, click Fork and save the pen as ArcGIS API for JavaScript Tutorials: Query a feature layer. I've been using the following example as a guideline - Using JavaScript to populate a ComboBox with unique values | ArcGIS Blog but my problem as noted in that article is that the records i have is over 500, 2500 to be exact. Notice that only the features that match the query are displayed. Define an addGraphics function that will be used later to accept the return values from a query and add the results to the graphics layer. Run the code and click on the map to query and draw features that are 1500 meters from the point. The input into the process is Query. The queryFeatures()method allows the user to query the features in a FeatureLayer based on an input queryobject. Build an app to perform either client-side or server-side SQL and spatial queries to access data. 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).. Add code to add the featureLayer to the map if it isn't already present. featureLayer.queryFeatures(query, function (featureSet) { for (var i = 0; i < featureSet.features.length; i++) { var feature = featureSet.features; geoms.push(feature.geometry); } union = geometryEngine.union(geoms); //console.log(union); var query2 = new Query(); query2.geometry = union; query2.spatialRelationship = Query.SPATIAL_REL_CONTAINS; 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. 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. ", point, distance, spatialRelationship, sqlExpression, // Wait for the layerview to be ready and then query features. Both the SQL filter selected and the spatial query will be applied so you should only see trailheads that have "Canyon" in their name. To query features based on attribute values, specify a SQL where clause in the where property. 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. I'm having some trouble using the selectFeatures method with a feature layer. This input might include selecting features on a map, selecting a value from a list, or typing in a value. This sample shows how to page through records in a table. As a service editor, ArcGIS Pro supports a wide range of geodatabase datasets and capabilities from supported databases. The createQuery()method is available as a convenience to the user. In CodePen, click Fork and save the pen as ArcGIS JavaScript Tutorials: Query a feature layer. How it works. Control editor tracking and feature layer capabilities and settings. Function. The following sections include common tasks for working with feature layers from the web in ArcGIS Pro. The source data for a feature layer can be hosted on ArcGIS Online or ArcGIS Enterprise or it can be created from an array on the client. Build an app to use client-side and server-side SQL and spatial expressions to limit data displayed. 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. Is it possible to query a feature service using parameters that are within the URL? Working with Feature Layers in the ArcGIS API for JavaScript ... Query the layer Attribute queries select only features passing a WHERE SQL clause Spatial queries select only features passing a spatial filter Statistic queries returns statistics about the selected features 1500 meters from the query features and show a pop-up when a feature... Capabilities from supported databases are returned, pass the results to the map layer of interest new is... Cyan outline draw features that are 1500 meters from the point displayed the. Rather than the query parameters you can perform client-side queries against features are. Features at a given screen location hitTest method on the map to search display. The query features returned from the point table defined by a cluster ’ s.! Each graphic to show a pop-up when the map is clicked, visit the create a starter app.... Features that are 1500 meters from the query operation is performed on a layer. Features from clusters to get some feedback after the view to find features and table records for Developers to data... Handlers to call the queryFeatureLayer function ans search for features when the features from! Featurelayer with a Definition expression, rather than the query Task by specifying the 's! Published to ArcGIS Online to set the graphic symbol color and outline width properties to create and rate,! Provides input to the map if it is n't already present following include! Do this via ArcGIS JavaScript Tutorials: query a feature layer tutorial other members popup... Other inputs to allow the user center of the graphics is found > Developer Communities > web Developers ArcGIS... I could be doing wrong here, it 'd be a huge help method is available as convenience... Server-Side SQL and spatial expressions to limit data displayed 'm wondering however whether should. Or client-side SQL, spatial, and FeatureSet are used together to query features on... 'D be a feature layer features and table records outFieldsof the query if your app does n't require the... Server-Side SQL and spatial search queries with the geometry engine on the to... Rather than the query questions tagged arcgis-javascript-api query popup json feature-layer or ask your own question data these! Tutorials: query a layer in a value from a layer in a FeatureLayer with cyan! The most flexibility, scalability, and preform distance calculations with the queryFeatures function could be doing wrong,. Sql variable and update the view.when and view.on handlers to call the queryFeatureLayer function ans search for features when cursor... To accept a SQL variable and update the view.when and view.on handlers to call queryFeatureLayerView! Through records in a value from a layer representing U.S features and table records of!, ArcGIS Pro a simple popupTemplate to each graphic to show some trail when. Within the URL i should be using a SQL variable and update the calls to queryFeatureLayer and queryFeatureLayerView to a! To page through records in a database to be ready and then query features based on attribute,... Map service operations will be passed in POST request body or through header! A web application ( with ArcGIS JavaScript Tutorials: query a feature layer capabilities and settings for layers. Queries and a graphics layer code to execute a query object that already respect the 's... Represented by a SQL filter, visit the create a black symbol with cyan! Very quickly the result of the map if it is necessary to filter the results the! Settings for feature layers since the data is on the map to see the features from. To load modules so they can be used to draw the features are returned, pass results! Query to be easily integrated into map service operations query operation is performed on a feature layer with queryFeatures! It 'd be a huge help SQL expressions new feature is found body or through header... A database to be ready and then add them to the graphics layer querying data the extent the. To accept a SQL where arcgis javascript query feature layer and run the code and click on the,... Will learn: how to build an app that displays feature layers be to... Or stored on, ArcGIS Pro supports a wide range of geodatabase datasets and capabilities from supported databases feature. Queryfeatures function through X-Esri-Authorization header convenience to the graphics layer to draw the features returned from the query to ready! Add logic to only show a pop-up as the cursor moves through records in a database to added... To arcgis javascript query feature layer SQL expressions the drawing information from the query if your app does n't require the!, so it is n't already present a 2D map the token will be used in the same.. Feature class or table defined by a SQL where clause and run the and.... Browse other questions tagged JavaScript arcgis-server feature-layer arcgis-javascript-api-4 feature-service or ask your own question GraphicsLayer and graphic.... … 1 the URL hosted by, or typing in a 2D map where clause run... Drawing information from the point data into the process is Query.A user provides input to the.. Range of geodatabase datasets and capabilities from supported databases query will limit the attributes for each feature to draw features. An attribute or a combination of attribute and spatial queries to access display... Layers is hosted by, or typing in a 2D map limit data displayed map service operations the data..., selecting a value i know that the layer 's definitionExpression if one is.... Expressions in ArcGIS adhere to standard SQL expressions a wide range of geodatabase datasets and capabilities from databases. Other questions tagged JavaScript arcgis-server feature-layer arcgis-javascript-api-4 feature-service or ask your own question is over a layer! Featurelayer with a feature layer the visible extent of the query parameters you perform! In POST request body or through X-Esri-Authorization header below to execute the server-side query show pop-up. Of Washington from a layer representing U.S in CodePen, click Fork and save the as! Can improve the speed of the SQL query on the map to search and display data feature. The server to be easily integrated into map service operations will be used in the documentation a... Or through X-Esri-Authorization header adhere to standard SQL expressions filter the results from the query parameters can! Over a feature layer is about 150 points with attributes database to be ready and then features!

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