Layer onLoad event, how to handle an error

mikewebster

So to load a layer is straight forward as taken from the "JavaScript API Concepts" page. Sniplet below...

function init() {
  var layer = new esri.layers.ArcGISDynamicMapServiceLayer(...);
  dojo.connect(layer, "onLoad", printInitialExtent);
}

How do you catch an event if the layer never gets loaded? Maybe the service is down. If the layer does not get loaded I want to inform the user (rather than a blank map).

HemingZhu

So to load a layer is straight forward as taken from the "JavaScript API Concepts" page. Sniplet below...

function init() {
  var layer = new esri.layers.ArcGISDynamicMapServiceLayer(...);
  dojo.connect(layer, "onLoad", printInitialExtent);
}

How do you catch an event if the layer never gets loaded? Maybe the service is down. If the layer does not get loaded I want to inform the user (rather than a blank map).

try this:
function init() {
  var layer = new esri.layers.ArcGISDynamicMapServiceLayer(...);
  dojo.connect(layer, "onLoad", printInitialExtent);
  dojo.connect(layer, "onError", function(error){
       alert ("There is a problem on loading the layer!");
  });
}