topic Issue on Loading Saver Side Zip File to ESRI Request in ArcGIS JavaScript Maps SDK Questions

Issue on Loading Saver Side Zip File to ESRI Request

BehrouzHosseini — Sun, 12 Dec 2021 02:37:05 GMT

ArcGIS JavaScript API is using This Demo to upload and pass a Zipped shapefile to esriRequest using "esri/request" module.

Now my question is is there any way that we load and pass a zipped shaefile from Server and not from client side like accessing the file by Ajax?

at current demo , thr form option is filling by `uploadForm` elemt by user submit at

    form: dom.byId('uploadForm'),

request({
    url: portalUrl + '/sharing/rest/content/features/generate',
    content: myContent,
    form: dom.byId('uploadForm'),
    handleAs: 'json',
    load: lang.hitch(this, function (response) {
    if (response.error) {
      errorHandler(response.error);
      return;
    }
    var layerName = response.featureCollection.layers[0].layerDefinition.name;
      addShapefileToMap(response.featureCollection);
    }),
    error: lang.hitch(this, errorHandler)
});‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Now, I need to pass a file directly to the options instead of using HTML File Dialog and Input. Something like:


//Get the zipped file from Ajax Call and pass it to a data variable 
var data = "www.domain.com/GIS/App.ZIP";

// assign form with data
 request({
 ....,
 form: data,
 ....
});‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Re: Issue on Loading Saver Side Zip File to ESRI Request

JohnGrayson — Tue, 08 Aug 2017 00:23:24 GMT

Bengi, is this the same question as How to Pass File Directly to esriRequest Instead of Using Form Upload? This task will probably involve a two step process; first get the file from the server and then call the 'generate' endpoint. The important thing here is to understand the call you're trying to make: Generate: ArcGIS REST API. The call to 'generate' doesn't have a parameter for URLs and since you're dealing with a zipped shapefile you'll have to use the 'file' parameter which then means you need to send the actual zipped shapefile as a file. Since the zipped shapefile is on a different server you'll first need to get the file to the client machine before sending it to the 'generate' call. Do you have a JSBin or JSFiddle that shows what you're trying to do?

Re: Issue on Loading Saver Side Zip File to ESRI Request

JohnGrayson — Sun, 12 Dec 2021 02:37:08 GMT

Bengi, below is the relevant code, and here's a modified version of the 'Add Shapefile' sample: Add Shapefile

//
// STEP #1a - GET ZIPPED SHAPEFLE FROM EXTERNAL SERVER //
//
var urlToExternalZippedShapefile = "http://apps.sfgov.org/datafiles/view.php?file=sfgis";
var zippedShapefileName = "sflnds_current";
request({
  url: lang.replace("{0}/{1}.zip", [urlToExternalZippedShapefile, zippedShapefileName]),
  handleAs: "blob",
  load: function (zipResponse) {

    //
    // STEP #1b - CREATE FORM USING RETURNED ZIPPED SHAPEFILE AS BLOB //
    //
    var formNode = domConstruct.create("form", {
      "method": "post",
      "enctype": "multipart/form-data"
    });
    var formData = new FormData(formNode);
    formData.append("file", zipResponse, zippedShapefileName + ".zip");


    //
    // THIS PART STAYS ALMOST SAME AS BEFORE //
    //
    var params = {
      'name': zippedShapefileName,
      'targetSR': map.spatialReference,
      'maxRecordCount': 1000,
      'enforceInputFileSizeLimit': true,
      'enforceOutputJsonSizeLimit': true
    };

    var extent = scaleUtils.getExtentForScale(map, 40000);
    var resolution = extent.getWidth() / map.width;
    params.generalize = false;
    params.maxAllowableOffset = resolution;
    params.reducePrecision = true;
    params.numberOfDigitsAfterDecimal = 0;

    var myContent = {
      'filetype': 'shapefile',
      'publishParameters': JSON.stringify(params),
      'f': 'json'
    };

    //
    // STEP #2 - CALL 'GENERATE' TO CONVERT SHAPEFILE TO FEATURECOLLECTION BUT USING BLOB NOW //
    //
    request({
      url: portalUrl + '/sharing/rest/content/features/generate',
      content: myContent,
      form: formData,  // NOTICE HOW WE USE THE FORMDATA OBJECT THAT HAS THE EMBEDDED ZIPPED SHAPEFILE AS A BLOB //
      handleAs: 'json',
      load: lang.hitch(this, function (response) {
        if(response.error) {
          errorHandler(response.error);
          return;
        }
        var layerName = response.featureCollection.layers[0].layerDefinition.name;
        dom.byId('upload-status').innerHTML = '<b>Loaded: </b>' + layerName;
        addShapefileToMap(response.featureCollection);
      }),
      error: lang.hitch(this, errorHandler)
    });
  }
});
‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Re: Issue on Loading Saver Side Zip File to ESRI Request

BehrouzHosseini — Sun, 12 Dec 2021 02:37:10 GMT

Great, Thanks a lots John,

but I am getting an error on my side! I download the `sflnds_current.zip` file from your sample server and load it to localhost directory at

http://localhost/Portal/

I also copy entire code of the demo page you gave me and updated the urlToExternalZippedShapefile as below

var urlToExternalZippedShapefile = "http://localhost/Portal/";
var zippedShapefileName = "sflnds_current";‍‍‍‍‍‍

but when I run the code I am getting this error message:

Cannot read property 'expand' of undefined

Can you please let me know what I am doing wrong here? Again Thanks

Re: Issue on Loading Saver Side Zip File to ESRI Request

JohnGrayson — Tue, 08 Aug 2017 18:36:21 GMT

The error seems to happen after you've gotten past the download part so it's hard to tell what is going on. Try debugging the app an add a breakpoint at the line that makes the 'getExtentForScale()' call; that might help you figure it out.