Identify Task-How to combine results from two deferred object?

GauriDeshmukh

I m executing identify task on multiple services,thus getting results of all services, i want to combine all results to show in a infowindow.

map.on('click',function(event){

  var identify_result=[];

  var resultDef=[];

  var callback_counter=0;

  var deferred;

  var counter_res=0;

  map.setCursor("Default");

  if(viewData_clicked){

  var def = new dojo.Deferred();

  dojo.forEach(layerInfo,function(id){

  var url = map.getLayer(id).url;

  identifyTask = new IdentifyTask(url);

  identifyParams = new IdentifyParameters();

  identifyParams.tolerance=10;

  identifyParams.returnGeometry = true;

  identifyParams.layerIds = map.getLayer(id).visibleLayers;

  identifyParams.layerOption = IdentifyParameters.LAYER_OPTION_VISIBLE;

  identifyParams.width = map.width;

  identifyParams.height = map.height;

  identifyParams.geometry = event.mapPoint;

  identifyParams.mapExtent = map.extent;

  deferred = identifyTask

    //identifyTask

  .execute(identifyParams)

  .addCallback(function (response) {

  console.log("response",response);

  return arrayUtils.map(response, function (result) {

  var feature = result.feature;

  var layerName = result.layerName;

  // map.infoWindow.setTitle(layerName);

  var content = "<tr bgcolor='grey'><th><b>Field Name</b></th><th><b>Value</b></th></tr>";

  $.each(feature.attributes,function (key,value){

  content +="<tr><td>"+ key+"</td><td><b>"+value+"</b></td></tr>";

  });

  // map.infoWindow.setContent("<table border='1'>"+content+"</table>");

  var infotemplate = new InfoTemplate(layerName,"<table border='1'>"+content+"</table>");

  feature.setInfoTemplate(infotemplate);

  return feature;

  });

  });//execute

  callback_counter++;

  identify_result.push(deferred);

  }); //forEach

  //if(layerInfo.length === callback_counter){

  //var def = identifyTask.execute();

  var res_features=[];

  dojo.require("dojo.promise.all");

  dojo.forEach(identify_result,function(i){

  counter_res++;

  var def = dojo.promise.all()

  def.then(function(result) {

  //res=result;

  dojo.forEach(result,function(element){

  dojo.forEach(element,function(j){

  res_features.push(j);

  });

  });

  if((identify_result.length === counter_res) && (res_features.length > 0) ){

  console.log("identify_result.length",identify_result.length);

  console.log("counter_res",counter_res);

  console.log("result",result);

  console.log("res_features",res_features);

    var defrd = new dojo.Deferred();

  defrd = deferred;

  defrd.results=res_features;

    console.log(defrd);

  //map.infoWindow.setFeatures([defrd]);

  //map.infoWindow.show(event.mapPoint);

  }

  });

});

JoshHevenor

You can run each Identify individually and append their results to your infoWindow, so no need to synchronize. I haven't tested as a whole, key part on line 12:

function handleIdentify(/*IdentifyResult*/ results){

    var features = [];

    // deal with results, set up templates, etc.
    // . . .
    // populate features as required

    // Get the features currently in your infoWindow
    var existingFeatures = map.infoWindow.features || [];
    // Append the latest result set
    map.infoWindow.setFeatures(existingFeatures.concat(features));  // <-- key part

}

function handleErrror(err){
    // . . .
}

// Your many service URLs
var serviceUrls = [
    "http://service1/",
    "http://service2/",
    "http://service3/",
];

// for each URL
for(n in services){
    // create a new task
    var identify = new IdentifyTask(serviceUrls);
    // set the params as needed
    var identifyParams = new IdentifyParameters();
    // Execute the task    
    identify.execute(identifyParams, handleIdentify, handleError);

}

map.infoWindow.show(somePoint);