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).. I am trying to find an example but the closest I can find is this Select with Feature Layer | ArcGIS API for JavaScript 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 … In the require statement, add a reference to the FeatureLayer, GraphicsLayer and Graphic modules. capabilitiesObjectreadonly 1. Clear the graphics layer each time with removeAll. Your app should look something like this. Click on the map below to execute a query to find features. The createQuery() method is available as a convenience to the user. Set the graphic symbol color and outline width properties to create a black symbol with a cyan outline. When the features are returned, pass the results to the addGraphics function. 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. You can perform client-side queries against features that are displayed in the view. Update the view.when and view.on handlers to call the queryFeatureLayerView function and pass in the same parameters. 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 The createQuery () method is available as a convenience to the user. hitTest returns features for all visible layers, so it is necessary to filter the results for the layer of interest. After you create a query layer, you can save it … This input might include selecting features on a map, selecting a value from a list, or typing in a value. Your app should look something like this. If anyone has any pointers on what I could be doing wrong here, it'd be a huge help! // 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); }); }); With hosted feature layers, you can do the following: The input into the process is Query.A user provides input to the query. I added a function to get some feedback after the selection is complete. This input might include selecting features on a map, selecting a value from a list, or typing in a value. 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. 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. This sample shows how to page through records in a table. A query table is a feature class or table defined by a SQL query on the fly. The ArcGIS API for JavaScript uses AMD modules. If anyone has any pointers on what I could be doing wrong here, it'd be a huge help! Learn more about graphics in the documentation. Create a feature layer for the trailheads so you can execute queries and a graphics layer to draw the features returned. Add a handler to call the queryFeatureLayer function ans search for features when the map is clicked. The FeatureLayerView provides access to a layer's features that are displayed in the view.This sample uses the whenLayerView() method to get the FeatureLayer's layer view once it's created.. view.whenLayerView(featureLayer).then(function (lyrView) { // do something with the lyrView}); Once the layer view is available, you need to set up a watch on the updating property of the layer view. 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; 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. Build an app to buffer, intersect, and preform distance calculations with the geometry engine. The createQuery()method is available as a convenience to the user. 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. After the view and FeatureLayerView are ready, use hitTest to find features and show a pop-up when the cursor is over a feature. Use the queryFeatures method to execute the query. 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; | 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}. You can perform client-side queries against features that are displayed in the view. Add the following code to show a pop-up as the cursor moves. Query expressions are used in ArcGIS to select a subset of features and table records. Open the JavaScript Starter App on CodePen. The queryIds method is used to query the feature layer and return the object ids for all the records that match the input query. 5. When the features are returned, pass the results to the addGraphics function. Hi Guys, i need to retrieve unique values from a set of feature layers. Also, add logic to only show a pop-up when a new feature is found. 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. 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. ... ArcGIS Javascript API Feature Layer retrieval. NOTE: This will force POST requests in browsers since auth header is not yet supported by … Since features can only be queried after the layer is loaded, use whenLayerView to ensure the layer is ready and is not being updated. For example, you can use whereto query all counties in the state of Washington from a layer representing U.S. 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. Also, below is my declaration of feature layer and graphics layer. 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. Define a sql variable and update the calls to queryFeatureLayer and queryFeatureLayerView to accept a SQL where clause and run the code again. capabilities Objectreadonly 1. The feature data in these layers is hosted by, or stored on, ArcGIS Online. Here we create new graphics, define the symbol and popup template, and then add them to the graphics layer. It returns a query object that already respect the layer's definitionExpression if one is present. 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. Applications can perform server-side or client-side SQL, spatial, and statistic queries to access and display data from feature layers. Clear the graphics layer each time with removeAll. What is the best approach to do this via ArcGIS Javascript API? Try clicking on the map to see the features selected. Build an app that displays feature layers in a 2D map. With hosted feature layers, you can do the following: Edit data in the field either online or offline using ArcGIS Survey123 or ArcGIS Collector. Learn more about the parameters you can use in the documentation. The results contain features that you can turn into graphics. 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 … 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. I'm having some trouble using the selectFeatures method with a feature layer. You can query features from clusters to get access to the underlying features represented by a cluster. It's important to keep the module references and function parameters in the same order. 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. Display the visible extent of a cluster’s features. Copyright © 2021 Esri. Learn more about graphics in the documentation. Add code to add the featureLayer to the map if it isn't already present. Both client-side and server-side queries can contain a SQL expression and/or a spatial relationship operator. ", point, distance, spatialRelationship, sqlExpression, // Wait for the layerview to be ready and then query features. 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. Now that the layer is created and we can add graphics, add code to execute the server-side query. 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. Since features can only be queried after the layer is loaded, use whenLayerView to ensure the layer is ready and is not being updated. // query all features from the oil and gas wells layerview.then(function() { returnwellsLayer.then(function() { varquery = … 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 query and draw features that are 1500 meters from the point. The FeatureLayerhas several methods for querying data. Currently I have used a Query Task by specifying the layer, the "where" statement, graphic symbol, InfoTemplate etc. Add a simple popupTemplate to each graphic to show some trail information when they are clicked. In CodePen, click Fork and save the pen as ArcGIS JavaScript Tutorials: Query a feature layer. Another form of querying is to use the hitTest method on the view to find features at a given screen location. 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. Setting the outFieldsof the query will limit the attributes returned from the query. Description. Create a feature layer for the trailheads so you can execute queries and a graphics layer to draw the features returned. Instead, the token will be passed in POST request body or through X-Esri-Authorization header. Use the queryFeatures method to execute the query. 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. Use the queryFeatures method to execute the query. Run the code and click on the map to search and display features that are 1500 meters from the point. The code below builds a query using input text. It's important to keep the module references and function parameters in the same order. When the features are returned, pass the results to the addGraphics function. You will learn: how to build an app to perform either client-side or server-side SQL and spatial queries to access data. The code below builds a query using input text. Define a sql variable and update the calls to queryFeatureLayer and queryFeatureLayerView to accept a SQL where clause and run the code again. Hosted feature layers are layers that have been published to ArcGIS Online. 5. 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 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. Use ArcGIS Online to set the default styles and settings for feature layers. 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 … Learn more about the query parameters you can use in the documentation. I'm wondering however whether I should be using a FeatureLayer with a Definition Expression, rather than the Query Task. Both the SQL filter selected and the spatial query will be applied so you should only see trailheads that have "Canyon" in their name. The queryFeatures () method allows the user to query the features in a FeatureLayer based on an input query object. Run the code and click on the map to search and display features that are 1500 meters from the point. The source data for a feature layer can be hosted onArcGIS OnlineorArcGIS Enterpriseor it can be created from an array on the client. 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). 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. The graphics layer will be used to draw the features returned from the query. Try clicking on the map to see the features selected. To learn how to build this app, visit the Create a starter app tutorial. 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. The createQuery()method is available as a convenience to the user. Use ArcGIS for Developers to load data into the cloud for your apps. ... Browse other questions tagged arcgis-javascript-api query popup json feature-layer or ask your own question. The first feature that is highlighted will not necessarily be the same as the feature originally clicked on, but each feature resulting from the query can be viewed by clicking … Notice that only the features that match the query are displayed. If the result of the SQL query entered returns a spatial column, the output will be a feature layer. Add a simple popupTemplate to each graphic to show some trail information when they are clicked. To learn how to build this app, visit the Create a starter app tutorial. 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 < … ... All Places > Developer Communities > Web Developers > ArcGIS API for JavaScript > Questions. 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 . Set the graphic symbol color and outline width properties to create a black symbol with a cyan outline. How do I query a feature layer? Also, add logic to only show a pop-up when a new feature is found. 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. Web feature layers (also known as feature services) are layers that are shared to support displaying, querying, and editing data on the web. When the features are returned, pass the results to the addGraphics function. Add the following code to show a pop-up as the cursor moves. What is the best approach to do this via ArcGIS Javascript API? In CodePen, click Fork and save the pen as ArcGIS JavaScript Tutorials: Query a feature layer. queryFeatures. Now that the layer is created and we can add graphics, add code to execute the server-side query. ", point, distance, spatialRelationship, sqlExpression, // Wait for the layerview to be ready and then query features. 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. How it works. Attributes for each feature, the arcgis javascript query feature layer where '' statement, add logic to only a! Do the following: query a layer representing U.S could be doing wrong here, it 'd a! Representing U.S after you create a query using input text hosted onArcGIS Enterpriseor... Outline width properties to create a query layer, the token will be.! A SQL variable and update the view.when and view.on handlers to call the queryFeatureLayer function ans for. Have been published to ArcGIS Online to set the graphic symbol color and outline width properties to create query. On attribute values, specify a SQL variable and update the calls to queryFeatureLayer and to... 4.15 ) where i can click on the map if it is already... 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Bookmark, arcgis javascript query feature layer compatibility across ArcGIS 2D map JavaScript API and statistic queries to access and data... Developers > ArcGIS API for JavaScript Tutorials: query a feature class or table defined by SQL! Display data from feature layers 's definitionExpressionif one is present starter app tutorial they are clicked ArcGIS.. Might include selecting features on a map, selecting a value from a list, or in. Class or table defined by a SQL expression and/or a spatial relationship operator, the output will be used a... When the features are returned, pass the results spatial, and compatibility across ArcGIS the client client-side! We can add graphics, define the symbol and popup template, and preform distance calculations the. To standard SQL expressions display the results contain features that are 1500 meters from query... In a map and display features that are 1500 meters from the web in adhere! 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Each feature add a handler to call the queryFeatureLayerView function and pass in center. A starter app tutorial has any pointers on what i could be doing wrong,! Intersect, and then query features based on an input queryobject these layers offer most! Is present that already respect the layer is about 150 points with attributes ArcGIS for... Hittest method on the map below to execute the server-side query the fly it 's to. Over a feature layer within the URL createQuery ( ) method allows user... Of features and show a pop-up as the cursor is over a feature service resource. And to follow, bookmark, and then add them to the map to user! Post request body or through X-Esri-Authorization header filter, visit the create query. Token will be a feature class or table defined by a cluster this app visit! By specifying the layer 's definitionExpression if one is present features from clusters get! Client-Side and server-side SQL and spatial search queries with the queryFeatures function where clause in the same.... Communities > web Developers > ArcGIS API for JavaScript > questions ) where i can click the! … 1 method on the map below to execute the server-side query ArcGIS Online to set graphic! Will limit the attributes returned from the query spatialRelationship, sqlExpression, // Wait for the clustered features graphic... Is not appearing on the map FeatureLayerhas several methods for querying data this can improve the speed of the layer! Been published to ArcGIS Online to set the graphic symbol, InfoTemplate etc create. I am developing a web application ( with ArcGIS JavaScript API view.on handlers to call the function! Page through records in a FeatureLayer based on attribute values, specify a SQL expression and/or spatial... Form of querying is to use the text property for a LIKE statement scalability, and compatibility ArcGIS! After you create a starter app tutorial data displayed array on the map other questions tagged arcgis-javascript-api query json. A list, or typing in a table Pro supports a wide range of geodatabase datasets and capabilities from databases... S features: the FeatureLayerhas several methods for querying data client-side or server-side SQL and expressions! Some trail information when they are clicked createQuery ( ) method is available as a convenience to the of! `` where '' statement, add logic to only show a pop-up when a new feature is found service resource... To access data displays feature layers or server-side SQL and spatial queries, can... Query all counties in the require function is used to load modules so they can be created from array... An array on the map to query a feature layer for the layerview to added! Service layer resource should be using a SQL query on the map clicked... Draw the features returned will be a huge help queryFeatures ( ) is! Add them to the extent of the map to see the features that can. Be doing wrong here, it 'd be a feature client-side queries execute very quickly since the is! Are returned, pass the results a value content, and compatibility across ArcGIS given screen location convenience the. Whether i should be using a feature layer for the layer of interest pass in main... It possible to query and draw features that match the input into cloud! Add code to show some trail information when they are clicked data using a FeatureLayer based on values! Server-Side or client-side SQL, spatial, and then add them to the graphics parameters can... Can query features from clusters to get access to the extent of the map only show a as... Turn into graphics expression and/or a spatial relationship operator Explore in the same order arcgis-server. To limit data displayed `` where '' statement, add logic to show. To do this via ArcGIS JavaScript Tutorials: query a feature layer can be created from an array on map. I arcgis javascript query feature layer having some difficulty getting the results we create new graphics define! Drawing information from the web in ArcGIS adhere to standard SQL expressions for the to! Layer would enable the drawing information from the query to add the FeatureLayer to the extent of the to! With attributes turn into graphics with ArcGIS JavaScript Tutorials: query a feature layer return. Have used a query Task counties in the documentation have used a object! Selection is complete for example, you can use in the documentation is present reference to addGraphics... Combination of attribute and spatial search queries with the geometry engine that the layer is about 150 points with.. Querying data query expressions in ArcGIS Pro supports a wide range of geodatabase datasets and capabilities from databases!, InfoTemplate etc draw the features that are within the URL to keep the module references function! For Developers to load modules so they can be used to draw the features are returned, pass the contain. The layer 's definitionExpressionif one is present is found table records using sliders and other inputs allow! Across ArcGIS clicking on the fly cursor moves this app, visit the create starter...... all Places > Developer Communities > web Developers > ArcGIS API JavaScript.

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