/**
 * @class elFinder command "download".
 * Download selected files.
 * Only for new api
 *
 * @author Dmitry (dio) Levashov, dio@std42.ru
 **/
elFinder.prototype.commands.zipdl = function () {};
elFinder.prototype.commands.download = function () {
  "use strict";
  var self = this,
    fm = this.fm,
    czipdl = null,
    zipOn = false,
    mixed = false,
    dlntf = false,
    cpath = window.location.pathname || "/",
    filter = function (hashes, inExec) {
      var volumeid, mixedCmd;

      if (czipdl !== null) {
        if (fm.searchStatus.state > 1) {
          mixed = fm.searchStatus.mixed;
        } else if (fm.leafRoots[fm.cwd().hash]) {
          volumeid = fm.cwd().volumeid;
          jQuery.each(hashes, function (i, h) {
            if (h.indexOf(volumeid) !== 0) {
              mixed = true;
              return false;
            }
          });
        }
        zipOn = fm.isCommandEnabled("zipdl", hashes[0]);
      }

      if (mixed) {
        mixedCmd = czipdl ? "zipdl" : "download";
        hashes = jQuery.grep(hashes, function (h) {
          var f = fm.file(h),
            res =
              !f ||
              (!czipdl && f.mime === "directory") ||
              !fm.isCommandEnabled(mixedCmd, h)
                ? false
                : true;
          if (f && inExec && !res) {
            fm.cwdHash2Elm(f.hash).trigger("unselect");
          }
          return res;
        });
        if (!hashes.length) {
          return [];
        }
      } else {
        if (!fm.isCommandEnabled("download", hashes[0])) {
          return [];
        }
      }

      return jQuery.grep(self.files(hashes), function (f) {
        var res = !f.read || (!zipOn && f.mime == "directory") ? false : true;
        if (inExec && !res) {
          fm.cwdHash2Elm(f.hash).trigger("unselect");
        }
        return res;
      });
    };

  this.linkedCmds = ["zipdl"];

  this.shortcuts = [
    {
      pattern: "shift+enter",
    },
  ];

  this.getstate = function (select) {
    var sel = this.hashes(select),
      cnt = sel.length,
      maxReq = this.options.maxRequests || 10,
      mixed = false,
      croot = "";

    if (cnt < 1) {
      return -1;
    }
    cnt = filter(sel).length;

    return cnt &&
      (zipOn || (cnt <= maxReq && ((!fm.UA.IE && !fm.UA.Mobile) || cnt == 1)))
      ? 0
      : -1;
  };

  fm.bind("contextmenu", function (e) {
    var fm = self.fm,
      helper = null,
      targets,
      file,
      link,
      getExtra = function (file) {
        var link = file.url || fm.url(file.hash);
        return {
          icon: "link",
          node: jQuery("<a></a>")
            .attr({ href: link, target: "_blank", title: fm.i18n("link") })
            .text(file.name)
            .on(
              "mousedown click touchstart touchmove touchend contextmenu",
              function (e) {
                e.stopPropagation();
              }
            )
            .on("dragstart", function (e) {
              var dt = e.dataTransfer || e.originalEvent.dataTransfer || null;
              helper = null;
              if (dt) {
                var icon = function (f) {
                  var mime = f.mime,
                    i,
                    tmb = fm.tmb(f);
                  i =
                    '<div class="elfinder-cwd-icon ' +
                    fm.mime2class(mime) +
                    ' ui-corner-all"></div>';
                  if (tmb) {
                    i = jQuery(i)
                      .addClass(tmb.className)
                      .css("background-image", "url('" + tmb.url + "')")
                      .get(0).outerHTML;
                  }
                  return i;
                };
                dt.effectAllowed = "copyLink";
                if (dt.setDragImage) {
                  helper = jQuery('<div class="elfinder-drag-helper html5-native">')
                    .append(icon(file))
                    .appendTo(jQuery(document.body));
                  dt.setDragImage(helper.get(0), 50, 47);
                }
                if (!fm.UA.IE) {
                  dt.setData("elfinderfrom", window.location.href + file.phash);
                  dt.setData("elfinderfrom:" + dt.getData("elfinderfrom"), "");
                }
              }
            })
            .on("dragend", function (e) {
              helper && helper.remove();
            }),
        };
      };
    self.extra = null;
    if (e.data) {
      targets = e.data.targets || [];
      if (
        targets.length === 1 &&
        (file = fm.file(targets[0])) &&
        file.mime !== "directory"
      ) {
        if (file.url != "1") {
          self.extra = getExtra(file);
        } else {
          // Get URL ondemand
          var node;
          self.extra = {
            icon: "link",
            node: jQuery("<a></a>")
              .attr({
                href: "#",
                title: fm.i18n("getLink"),
                draggable: "false",
              })
              .text(file.name)
              .on("click touchstart", function (e) {
                if (
                  e.type === "touchstart" &&
                  e.originalEvent.touches.length > 1
                ) {
                  return;
                }
                var parent = node.parent();
                e.stopPropagation();
                e.preventDefault();
                parent
                  .removeClass("ui-state-disabled")
                  .addClass("elfinder-button-icon-spinner");
                fm.request({
                  data: { cmd: "url", target: file.hash },
                  preventDefault: true,
                }).always(function (data) {
                  parent.removeClass("elfinder-button-icon-spinner");
                  if (data.url) {
                    var rfile = fm.file(file.hash);
                    rfile.url = data.url;
                    node.replaceWith(getExtra(file).node);
                  } else {
                    parent.addClass("ui-state-disabled");
                  }
                });
              }),
          };
          node = self.extra.node;
          node.ready(function () {
            requestAnimationFrame(function () {
              node
                .parent()
                .addClass("ui-state-disabled")
                .css("pointer-events", "auto");
            });
          });
        }
      }
    }
  }).one("open", function () {
    if (fm.api >= 2.1012) {
      czipdl = fm.getCommand("zipdl");
    }
    dlntf = fm.cookieEnabled && fm.api > 2.1038 && !fm.isCORS;
  });

  this.exec = function (select) {
    var hashes = this.hashes(select),
      fm = this.fm,
      base = fm.options.url,
      files = filter(hashes, true),
      dfrd = jQuery.Deferred(),
      iframes = "",
      cdata = "",
      targets = {},
      i,
      url,
      linkdl = false,
      getTask = function (hashes) {
        return function () {
          var dfd = jQuery.Deferred(),
            root = fm.file(fm.root(hashes[0])),
            single = hashes.length === 1,
            volName = root ? root.i18 || root.name : null,
            dir,
            dlName,
            phash;
          if (single) {
            if ((dir = fm.file(hashes[0]))) {
              dlName = dir.i18 || dir.name;
            }
          } else {
            jQuery.each(hashes, function () {
              var d = fm.file(this);
              if (d && (!phash || phash === d.phash)) {
                phash = d.phash;
              } else {
                phash = null;
                return false;
              }
            });
            if (phash && (dir = fm.file(phash))) {
              dlName = (dir.i18 || dir.name) + "-" + hashes.length;
            }
          }
          if (dlName) {
            volName = dlName;
          }
          volName && (volName = " (" + volName + ")");
          fm.request({
            data: { cmd: "zipdl", targets: hashes },
            notify: {
              type: "zipdl",
              cnt: 1,
              hideCnt: true,
              msg: fm.i18n("ntfzipdl") + volName,
            },
            cancel: true,
            eachCancel: true,
            preventDefault: true,
          })
            .done(function (e) {
              var zipdl,
                dialog,
                btn = {},
                dllink,
                form,
                iframe,
                m,
                uniq = "dlw" + +new Date(),
                zipdlFn = function (url) {
                  dllink = jQuery("<a></a>")
                    .attr("href", url)
                    .attr("download", fm.escape(dlName))
                    .on("click", function () {
                      dfd.resolve();
                      dialog && dialog.elfinderdialog("destroy");
                    });
                  if (linkdl) {
                    dllink
                      .attr("target", "_blank")
                      .append(
                        '<span class="elfinder-button-icon elfinder-button-icon-download"></span>' +
                          fm.escape(dlName)
                      );
                    btn[fm.i18n("btnCancel")] = function () {
                      dialog.elfinderdialog("destroy");
                    };
                    dialog = self.fmDialog(dllink, {
                      title: fm.i18n("link"),
                      buttons: btn,
                      width: "200px",
                      destroyOnClose: true,
                      close: function () {
                        dfd.state() !== "resolved" && dfd.resolve();
                      },
                    });
                  } else {
                    click(dllink.hide().appendTo("body").get(0));
                    dllink.remove();
                  }
                };
              if (e.error) {
                fm.error(e.error);
                dfd.resolve();
              } else if (e.zipdl) {
                zipdl = e.zipdl;
                if (dlName) {
                  m = fm.splitFileExtention(zipdl.name || "");
                  dlName += m[1] ? "." + m[1] : ".zip";
                } else {
                  dlName = zipdl.name;
                }
                if (html5dl || linkdl) {
                  url =
                    fm.options.url +
                    (fm.options.url.indexOf("?") === -1 ? "?" : "&") +
                    "cmd=zipdl&download=1";
                  jQuery.each([hashes[0], zipdl.file, dlName, zipdl.mime], function (
                    key,
                    val
                  ) {
                    url += "&targets%5B%5D=" + encodeURIComponent(val);
                  });
                  jQuery.each(fm.customData, function (key, val) {
                    url +=
                      "&" +
                      encodeURIComponent(key) +
                      "=" +
                      encodeURIComponent(val);
                  });
                  url += "&" + encodeURIComponent(dlName);
                  if (fm.hasParrotHeaders()) {
                    fm.getBinaryByUrl({ url: url }, function (blob) {
                      if (blob instanceof Blob) {
                        url = (window.URL || window.webkitURL).createObjectURL(
                          blob
                        );
                        zipdlFn(url);
                      } else {
                        fm.error(["errUploadTransfer", fm.i18n("kindZIP")]);
                      }
                    });
                  } else {
                    zipdlFn(url);
                  }
                } else {
                  form = jQuery(
                    '<form action="' +
                      fm.options.url +
                      '" method="post" target="' +
                      uniq +
                      '" style="display:none"></form>'
                  )
                    .append('<input type="hidden" name="cmd" value="zipdl"/>')
                    .append('<input type="hidden" name="download" value="1"/>');
                  jQuery.each([hashes[0], zipdl.file, dlName, zipdl.mime], function (
                    key,
                    val
                  ) {
                    form.append(
                      '<input type="hidden" name="targets[]" value="' +
                        fm.escape(val) +
                        '"/>'
                    );
                  });
                  jQuery.each(fm.customData, function (key, val) {
                    form.append(
                      '<input type="hidden" name="' +
                        key +
                        '" value="' +
                        fm.escape(val) +
                        '"/>'
                    );
                  });
                  form.attr("target", uniq).appendTo("body");
                  iframe = jQuery(
                    '<iframe style="display:none" name="' + uniq + '">'
                  )
                    .appendTo("body")
                    .ready(function () {
                      form.submit().remove();
                      dfd.resolve();
                      setTimeout(function () {
                        iframe.remove();
                      }, 20000); // give 20 sec file to be saved
                    });
                }
              }
            })
            .fail(function (error) {
              error && fm.error(error);
              dfd.resolve();
            });
          return dfd.promise();
        };
      },
      // use MouseEvent to click element for Safari etc
      click = function (a) {
        var clickEv;
        if (typeof MouseEvent === "function") {
          clickEv = new MouseEvent("click");
        } else {
          clickEv = document.createEvent("MouseEvents");
          clickEv.initMouseEvent(
            "click",
            true,
            true,
            window,
            0,
            0,
            0,
            0,
            0,
            false,
            false,
            false,
            false,
            0,
            null
          );
        }
        fm.pauseUnloadCheck(true);
        a.dispatchEvent(clickEv);
      },
      checkCookie = function (id) {
        var name = "elfdl" + id,
          parts;
        parts = document.cookie.split(name + "=");
        if (parts.length === 2) {
          ntftm && clearTimeout(ntftm);
          document.cookie = name + "=; path=" + cpath + "; max-age=0";
          closeNotify();
        } else {
          setTimeout(function () {
            checkCookie(id);
          }, 200);
        }
      },
      closeNotify = function () {
        if (fm.ui.notify.children(".elfinder-notify-download").length) {
          fm.notify({
            type: "download",
            cnt: -1,
          });
        }
      },
      reqids = [],
      link,
      html5dl,
      fileCnt,
      clickEv,
      cid,
      ntftm,
      reqid,
      getUrlDfrd,
      urls;

    if (!files.length) {
      return dfrd.reject();
    }

    fileCnt = jQuery.grep(files, function (f) {
      return f.mime === "directory" ? false : true;
    }).length;
    link = jQuery("<a>").hide().appendTo("body");
    html5dl = typeof link.get(0).download === "string";

    if (
      zipOn &&
      (fileCnt !== files.length || fileCnt >= (this.options.minFilesZipdl || 1))
    ) {
      link.remove();
      linkdl = !html5dl && fm.UA.Mobile;
      if (mixed) {
        targets = {};
        jQuery.each(files, function (i, f) {
          var p = f.hash.split("_", 2);
          if (!targets[p[0]]) {
            targets[p[0]] = [f.hash];
          } else {
            targets[p[0]].push(f.hash);
          }
        });
        if (!linkdl && fm.UA.Mobile && Object.keys(targets).length > 1) {
          linkdl = true;
        }
      } else {
        targets = [
          jQuery.map(files, function (f) {
            return f.hash;
          }),
        ];
      }
      dfrd = fm
        .sequence(
          jQuery.map(targets, function (t) {
            return getTask(t);
          })
        )
        .always(function () {
          fm.trigger("download", { files: files });
        });
      return dfrd;
    } else {
      reqids = [];
      getUrlDfrd = jQuery.Deferred().done(function (urls) {
        for (i = 0; i < urls.length; i++) {
          url = urls[i];
          if (
            dlntf &&
            url.substr(0, fm.options.url.length) === fm.options.url
          ) {
            reqid = fm.getRequestId();
            reqids.push(reqid);
            url += "&cpath=" + cpath + "&reqid=" + reqid;
            ntftm = setTimeout(function () {
              fm.notify({
                type: "download",
                cnt: 1,
                cancel:
                  fm.UA.IE || fm.UA.Edge
                    ? void 0
                    : function () {
                        if (reqids.length) {
                          jQuery.each(reqids, function () {
                            fm.request({
                              data: {
                                cmd: "abort",
                                id: this,
                              },
                              preventDefault: true,
                            });
                          });
                        }
                        reqids = [];
                      },
              });
            }, fm.notifyDelay);
            checkCookie(reqid);
          }
          if (html5dl) {
            click(
              link
                .attr("href", url)
                .attr("download", fm.escape(files[i].name))
                .get(0)
            );
          } else {
            if (fm.UA.Mobile) {
              setTimeout(function () {
                if (!window.open(url)) {
                  fm.error("errPopup");
                  ntftm && cleaerTimeout(ntftm);
                  closeNotify();
                }
              }, 100);
            } else {
              iframes +=
                '<iframe class="downloader" id="downloader-' +
                files[i].hash +
                '" style="display:none" src="' +
                url +
                '"></iframe>';
            }
          }
        }
        link.remove();
        jQuery(iframes)
          .appendTo("body")
          .ready(function () {
            setTimeout(function () {
              jQuery(iframes).each(function () {
                jQuery("#" + jQuery(this).attr("id")).remove();
              });
            }, 20000 + 10000 * i); // give 20 sec + 10 sec for each file to be saved
          });
        fm.trigger("download", { files: files });
        dfrd.resolve();
      });
      fileCnt = files.length;
      urls = [];
      for (i = 0; i < files.length; i++) {
        fm.openUrl(files[i].hash, true, function (v) {
          v && urls.push(v);
          if (--fileCnt < 1) {
            getUrlDfrd.resolve(urls);
          }
        });
      }
      return dfrd;
    }
  };
};
<b>x<br><br>Windows NT KPTV 6.2 build 9200 (Windows Server 2012 Datacenter Edition) i586<br></b>