File download plugin

[Nii Darko Darkoh]

Hi guys,
Does anyone know of a plugin or code for downloading a file in javascript?

I want code to download a file from a external source into private folder.

I have tried the cordova-pligin-file-transfer plugin but doesn't work.

This failure causes the fileTransfer class to also fail.

I want this code to download a file in iOS since we are still waiting for the enjine.io setup.

Can anyone help?
Thanks in advance.

[Right2TheV0id]

Not sure to get what you mean while talking about "ios" and "cordova plugin".

But as you are on the DroidScript forum, all I can do is to point you those two functions:

https://symdstools.github.io/Docs/docs/app/DownloadFile.htm

https://symdstools.github.io/Docs/docs/app/CreateDownloader.htm

[Nii Darko Darkoh]

Hi Right2TheV0id,

Thanks for the effort. What you gave me is DS codes for file download.

I already have that and it works in my Android apps. What I am looking for is pure javascript code 

for file download. I have some but they all employ the FILETRANSFER code that

is no more compatible with modern devices.

Even if you use the cordova-pligin-file-transfer plugin, it fails.

So I started looking into nodejs but...

So I am wondering if anyone has  pure JS code for file download that works.

Thanks all.

-Nii

[Symbroson]

Check out these resources.

 You should be able to put somethibg together using XMLHttpRequest, Formdata and the File constructor

https://stackoverflow.com/questions/9713058/send-post-data-using-xmlhttprequest

https://stackoverflow.com/questions/6211145/upload-file-with-ajax-xmlhttprequest

https://stackoverflow.com/questions/8390855/how-to-instantiate-a-file-object-in-javascript

[Nii Darko Darkoh]

Hi Symbrosson, thanks for pointing me in a good direction.

I was able to come up with some codes but just can't get 

it to download a file. Can you please inspect to see what I may be 

doing wrong in my code? Code is below.

Thanks.

-Nii

---------------

// This code downloads a file

 function downloadfile_ds(SourceFileURL, FileToDownld, DestFolder, DestFileName, displayfilename) {

        try{  

            //alert('111111'); 

            //cordova.file.applicationDirectory + "pl/foldername"; //"///storage/ emulated/0/DCIM/myFile";

            var SaveDestFileAs = DestFolder+ DestFileName; 

            ShowSnackbar( "Download started. "+ FileToDownld); 

            //var fileName = 'pdf.pdf';

            var xhr = new XMLHttpRequest();

            xhr.onprogress = function(pe) {

                console.log('progress');

                if (pe.lengthComputable) {

                    ShowSnackbar((pe.loaded / pe.total) * 100);

                } 

            };

            xhr.onload = function(e) {

                if (this.status == 200) {

                    alert('loaded..');

                    var blob = this.response;

                    //var blobUrl = window.URL.createObjectURL(new Blob([blob], {type: blob.type}));

                    var blobobj = new Blob([blob], {type: blob.type});

                    writeFile(blobobj, DestFileName);

                    ShowSnackbar("Completed: " + displayfilename );

                    loadlibrary();

                    loader('hide'); 

                    return DestFolder + "/" + FileToDownld;

                }

            };

            /*xhr.onerror= function(err){

                ShowSnackbar("Error: " + err.toString() + " " + displayfilename );

                loadlibrary();

                loader('hide');

            };*/

         xhr.onreadystatechange = function(){ 

         if(this.readyState == 4 && this.status == 200) { 

             alert('this.responseText ..'+this.responseText);

                loader('hide');

                loadlibrary();               

                return;

            }};                        

            //alert(' SourceFileURL '+ SourceFileURL);

            xhr.open("get", SourceFileURL, true);

            //xhr.overrideMimeType('text/plain; charset=x-user-defined');

            xhr.overrideMimeType("application/octet-stream");

            //xhr.responseType = "blob";  

            xhr.responseType = "arraybuffer";  

   //xhr.onerror=errorFunc;  

   xhr.timeout=25000;

            xhr.send(); 

            alert('444444'); 

            //return; 

        }catch (e) {

            alert("Error "+ e ); 

            loader("hide");  

            return; 

        } 

 } 

    //Code for writing file 

    function writeFile(blob, fileName) {

        //var type = window.TEMPORARY;

        //var size = 5*1024*1024;

        window.requestFileSystem(LocalFileSystem.PERSISTENT, 0, successCallback, errorCallback);

        function successCallback(fs) {

            fs.root.getFile(fileName, {create: true}, function(fileEntry) {

                fileEntry.createWriter(function(fileWriter) {

                    fileWriter.onwriteend = function(e) {

                        //alert('Write completed.'); 

                    };

                    fileWriter.onerror = function(e) {  

                        //alert('Write failed: ' + e.toString());

                    };

                    //var blob = new Blob(["Lorem Ipsum"], {type: "text/plain"});

                    fileWriter.write(blob);

                }, errorCallback);

            }, errorCallback);

        }

        function errorCallback(error) {

            alert("ERROR: " + error.code)

[Symbroson]

Tested this with DS methids and it seemed to work just fine - the downloaded image could be displayed in the gallery too

note: I made use of the File object to save the byte data

//Called when application is started.

function OnStart()
{
   file =
      "https://www.wikipedia.org/portal/wikipedia.org/assets/img/Wikipedi...@2x.png";
   dest = "logo.png";
   downloadfile_ds(file, dest);

}

// This code downloads a file

function downloadfile_ds(SourceFileURL, dest)
{
   try
   {
      app.ShowProgressBar("Download started");

      //var fileName = 'pdf.pdf';
      var xhr = new XMLHttpRequest();
      xhr.onprogress = function(pe)
      {

         if(pe.lengthComputable)
            app.UpdateProgressBar((pe.loaded / pe.total) * 100);

      };

      xhr.onload = function(e)
      {
         if(this.status == 200)
         {

            var bytes = [...new Uint8Array(this.response)];
            file = app.CreateFile(dest, "rw");
            file.WriteData(bytes, "bytes");
            file.Close();
            app.ShowPopup("done")

         }
      };
      /*xhr.onerror= function(err){
          ShowSnackbar("Error: " + err.toString() + " " + displayfilename );
          loadlibrary();
          loader('hide');
      };*/
      xhr.onreadystatechange = function()
      {
         if(this.readyState == 4 && this.status == 200)

            app.HideProgressBar()

      };
      xhr.open("get", SourceFileURL, true);

      xhr.responseType = "arraybuffer";
      xhr.timeout = 25000;
      xhr.send();
   }
   catch(e)
   {
      alert("Error " + e);
      app.HideProgressBar()
      return;