Save image from url into device photo gallery

This is file download code which can be used by anyone. You just require three parameters to use this like :-

1) **URL**

2) **Folder name** which you want to create in your Sdcard

3) **File name** (You can give any name to file)

All types of file can download by using this code. you can use this as .js
And this works on `IOS` also.


 *First step check parameters mismatch and checking network connection if available call    download function

    function DownloadFile(URL, Folder_Name, File_Name) {
    //Parameters mismatch check
    if (URL == null && Folder_Name == null && File_Name == null) {
        return;
    }
    else {
          //checking Internet connection availablity
          var networkState = navigator.connection.type;
          if (networkState == Connection.NONE) {
              return;
          } else {
              download(URL, Folder_Name, File_Name); //If available download function call
          }
        }
      }


*Second step to get Write permission and Folder Creation
 
    function download(URL, Folder_Name, File_Name) {
      //step to request a file system
        window.requestFileSystem(LocalFileSystem.PERSISTENT, 0, fileSystemSuccess, fileSystemFail);

    function fileSystemSuccess(fileSystem) {
        var download_link = encodeURI(URL);
        ext = download_link.substr(download_link.lastIndexOf('.') + 1); //Get extension of URL

        var directoryEntry = fileSystem.root; // to get root path of directory
        directoryEntry.getDirectory(Folder_Name, { create: true, exclusive: false }, onDirectorySuccess, onDirectoryFail); // creating folder in sdcard
        var rootdir = fileSystem.root;
        var fp = rootdir.fullPath; // Returns Fulpath of local directory

        fp = fp + "/" + Folder_Name + "/" + File_Name + "." + ext; // fullpath and name of the file which we want to give
        // download function call
        filetransfer(download_link, fp);
    }

    function onDirectorySuccess(parent) {
        // Directory created successfuly
    }

    function onDirectoryFail(error) {
        //Error while creating directory
        alert("Unable to create new directory: " + error.code);
    }

      function fileSystemFail(evt) {
        //Unable to access file system
        alert(evt.target.error.code);
     }
    }

*Third step for download a file into created folder

    function filetransfer(download_link, fp) {
    var fileTransfer = new FileTransfer();
    // File download function with URL and local path
    fileTransfer.download(download_link, fp,
                        function (entry) {
                            alert("download complete: " + entry.fullPath);
                        },
                function (error) {
                    //Download abort errors or download failed errors
                    alert("download error source " + error.source);
                    //alert("download error target " + error.target);
                    //alert("upload error code" + error.code);
                }
                );
    }

**Useful Link - Phonegap Docs