Retrieve a JSON WebMap using an ArcGIS JavaScript API Map object

Is there a way to retrieve a JSON representation of a WebMap object from a JavaScript Map object in the ArcGIS JavaScript API without relying on ArcGIS.com? It would be ideal if there was a method similar to:

webMapAsJSON = map.toWebMap();

The "Export Web Map Task" documentation in the REST API suggests that it should be possible, as it states:

"The ArcGIS web APIs (for JavaScript, Flex, Silverlight, etc.) allow developers to easily get this JSON string from the map."

Despite this statement, I haven't been able to find any built-in functionality within the Map object or elsewhere in the API that facilitates this task.

javascriptjsonarcgisarcgis-js-apiarcgis-server

Answer №1

It is not recommended to obtain this information officially, but there is a workaround available. By utilizing the proxy pattern and accessing the undocumented function _getPrintDefinition, you can achieve the desired functionality at your own risk.

var proxy_getPrintDefinition = printTask._getPrintDefinition;

printTask._getPrintDefinition = function() {
    var getPrintDefResult = proxy_getPrintDefinition.apply(this, arguments);
    
    console.log(Json.stringify(getPrintDefResult));

    return getPrintDefResult;
    }

This process involves manipulating the Web_Map_as_JSON object using PrintTask and PrintParameters objects within the ArcGIS JS library. Be cautious as future updates may render this method obsolete. Proceed with caution if you choose to implement this solution.

Answer №2

Looking for a way to export your map to the web map JSON spec in order to save it to ArcGIS Online or Portal? While @Suttikeat Witchayakul's solution for printing the map using a print service may be useful, exporting the map to this specific format can present some challenges.

The web map specification differs from the export web map specification used by print tasks, making it difficult to directly convert a map object. Currently, the ArcGIS API for JavaScript does not offer built-in methods for this conversion. However, there is a somewhat outdated library called cereal that may serve as a workaround until version 4 of the API introduces this functionality. Keep in mind that cereal may not fully support all layer types, requiring potential extensions to make it work seamlessly with your map.

Answer №3

To export your map using "esri/tasks/PrintTask", you need to utilize "esri/tasks/PrintParameters" to execute the printTask successfully. Simply assign your map object directly to the printParameter.

require([
  "esri/map", "esri/tasks/PrintTemplate", "esri/tasks/PrintParameters", ... 
], function(Map, PrintTemplate, PrintParameters, ... ) {
  var map = new Map( ... );

  var template = new PrintTemplate();
  template.exportOptions = {
    width: 500,
    height: 400,
    dpi: 96
  };
  template.format = "PDF";
  template.layout = "MAP_ONLY";
  template.preserveScale = false;

  var params = new PrintParameters();
  params.map = map;
  params.template = template;
  printTask.execute(params, printResult);
});

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