How is a query used in a querytask?
The input into the process is Query. A user provides input to the query. This input might include selecting features on a map, selecting a value from a list, or typing in a value. The input is used to create a query filter. In the next step of the process, the QueryTask is executed based on the query filter.
Why are there different errors in try and catch JavaScript?
The throw statement lets you create custom errors. The finally statement lets you execute code, after try and catch, regardless of the result. When executing JavaScript code, different errors can occur. Errors can be coding errors made by the programmer, errors due to wrong input, and other unforeseeable things.
How does the try statement work in JavaScript?
JavaScript catches adddlert as an error, and executes the catch code to handle it. The try statement allows you to define a block of code to be tested for errors while it is being executed. The catch statement allows you to define a block of code to be executed, if an error occurs in the try block.
What does a featureset do in ArcGIS querytask?
A FeatureSet contains an array of Graphic features, which can be added to the map. This array will not be populated if no results are found. Specifies the attributes and spatial filter of the query.
When does the querytask fire in JavaScript?
Fires when the query operation is complete. Fires when an error occurs when executing the task. Fires when the query for the count is complete. Fires when the query for the extent is complete. Fires when the query on IDs is complete. Fires when the executeRelationshipQuery is complete.
When to return error object in JavaScript querytask?
Specifies the attributes and spatial filter of the query. The function to call when the method has completed. The arguments in the function are the same as the onComplete event. An error object is returned if an error occurs on the Server during task execution.