topic Re: query multiple layers in ArcGIS JavaScript Maps SDK Questions

query multiple layers

PeggyCorey — Thu, 21 May 2015 13:51:11 GMT

Can anyone please tell me... how can you perform a Query/QueryTask on multiple layers? I know you can perform a Find/FindTask on multiple layers by including multiple numbers in the array: findParams.layerIds = [0,1,2]. But I can't find the equivalent for Query/QueryTask.

Thanks for any help!

Re: query multiple layers

JakeSkinner — Thu, 21 May 2015 14:03:36 GMT

Hi Peggy,

Here is a sample that demonstrates this.

Re: query multiple layers

ToddBlanchette — Thu, 21 May 2015 14:06:26 GMT

Hi Peggy,

See if this can help Manage results from multiple queries | ArcGIS API for JavaScript

[Edit: Jake's answer is the same as mine, he fired it up while I was writing this ]

Cheers,

Todd

Re: query multiple layers

thejuskambi — Thu, 21 May 2015 14:06:46 GMT

You can not query on multiple layers at the same time. What you could do is query on each layers and combine the results together using the dojo/promise/all as discussed in this thread

How to nest dojo async calls and wait until all are complete

Only instead of layer.queryFeatures your need to use QueryTask for each of the layers.

Re: query multiple layers

PeggyCorey — Thu, 21 May 2015 14:17:24 GMT

Thanks Jake, Todd and thejus.

All replies were helpful. I'll try to work my way through using PROMISES - Yikes!