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POesri javascript asynchronous print
 

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    <h1>The Setup:</h1> <p>I am using the <a href="http://help.arcgis.com/en/webapi/javascript/arcgis/help/jsapi_start.htm#jsapi/printtask.htm" rel="nofollow">javascript API v. 2.8 from ESRI</a>, which itself uses the <strong>dojo toolkit v. 1.6</strong>. I have the <a href="http://resources.arcgis.com/en/help/main/10.1/index.html#//0154000005z2000000" rel="nofollow">ArcGIS Server v. 10.1</a> running on Windows in Amazon's EC2.</p> <p>I can successfully execute a PrintTask with javascript that POSTs JSON to my server, which runs a process and returns a PDF to the client-browser. But this request is <em>synchronous</em> and can take a minute or two, causing <strong>Heroku</strong> to timeout with an H12 error.</p> <h1>The Problem:</h1> <p>When I toggle the [ ] Asynchronous checkbox to <strong>ON</strong> on the ArcGIS server, my PrintTask returns:</p> <pre><code>{"error":{"code":500,"message":"Error performing execute operation","details":[]}} </code></pre> <p>I'm not sure where to go from here. Does anybody have any examples or experience running an asynchronous print task on ArcGIS server?</p> <p>The javascript for the printTask is below. Is there a way to re-write this javascript to be more asynchronous, or "non-blocking"?</p> <h1>The code</h1> <p><em>(stripped down for brevity)</em></p> <pre><code>dojo.require("esri.tasks.PrintTask"); function Print() { var printTool = this; this.executePrint = function(){ var params = new esri.tasks.PrintParameters(); params.map = map; params.template = selectedTemplate; printTask = new esri.tasks.PrintTask(printUrl, {async: true}); printTask.execute(params, printTool.printComplete, printTool.printError); }; this.printComplete = function(result){ dojo.place("&lt;div&gt;&lt;a href='" + result.url + "'&gt;&lt;/a&gt;&lt;/div&gt;", printForm, "last"); }; this.printError = function(err){ dojo.byId("printJob").innerHTML = err; }; } </code></pre>
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