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Question asked by sucinimad on Mar 9, 2016
Latest reply on Mar 9, 2016 by sucinimad

Hi guys,


I'm working on a map that uses FeatureLayer.Mode_ONDEMAND. To see certain layer, I pass in a project ID using featureLayer.setDefinitionExpression. Where such layer exists, I see it. What I want to know is how to detect when no layer exists. I want to print an alert to the viewer instead of showing just a blank map. Here's my code:


function init() {

  map = new esri.Map("mapDiv", {

   basemap: "topo",

   center: [-116.73536, 33.033989],

   zoom: 9



  var featureLayer = new esri.layers.FeatureLayer("",{

   mode: esri.layers.FeatureLayer.MODE_ONDEMAND,

   outFields: ["*"],

   opacity: 1




  featureLayer.setDefinitionExpression("SrvyDescID=\'' . htmlspecialchars($ProjectID) . '\'");






What I learned is when the project is valid, will return an array. But I'm unable to treat it like an array. For example, featureLayer.graphic[0] returns "undefined". featureLayer.graphic.length also doesn't work. And yet, my console.log does return an object. How do I detect this object?


Attached is a screenshot of the console log. Thanks for your help.