topic Re: ArcGIS Server MapService Query in ArcGIS JavaScript Maps SDK Questions

ArcGIS Server MapService Query

ShaningYu — Thu, 18 Dec 2014 18:47:18 GMT

I might classify this thread as a bug report. The scenario is described below:

I created a JS application that does query on a MapService layer. In the debugging, I got the value of the query.where clause. If I post this clause into the MapService layer's Where textbox, and then click the Query button, I can get respected results (e.g. a couple of dozens of records, which are the same as that in ArcMap's definition-query on the map layer in the map document). This query clause is VERY long. In my JS application, I put a break-point in function showResults(). If the query clause is NOT too long, the code goes through smoothly. However, if the clause is Too Long, it goes through without any break. I would guess there is may be a bug in the API that may limits the length of whereClause. If you have similar experience like that, please share Thanks for your attention.

queryTask.execute(query, showResults);

...

function showResults(result) {

var items = [];

for (var i = 0, il = result.features.length; i < il; i++) {

items.push(result.features.attributes);

}

...

}

Re: ArcGIS Server MapService Query

KenBuja — Thu, 18 Dec 2014 18:58:21 GMT

If your request is longer than 2048 characters, you'll need to use a proxy.

Re: ArcGIS Server MapService Query

ShaningYu — Thu, 18 Dec 2014 20:20:20 GMT

Ken: Thanks for your point. I added a couple lines of code, but it still does not work. The code I added are listed below:

dojo.require("esri.urlUtils"); // for proxy

...

In function init(), added:

esriConfig.defaults.io.proxyUrl = _proxyURL;

esriConfig.defaults.io.alwaysUseProxy = false;

Did I miss anything else? Thanks if you can further point it out.