createForm Function - DevMaxDE

function createForm(url, username, password, response) {
  if(!url || !username || !password) {
    console.error("URL, Nutzername und Passwort müssen angegeben sein!");
    return;
  }
  $.ajax({
    url: "",
    method: "POST",
    data: { url: url }
  }).done(function(data) {
    try {
      if(data.length > 0)
      for(form of $(data).find("form").get()) {
        var i = 0, mail = false, u, p;
        for(input of $(form).find("input").get()) {
          var type = input.getAttribute("type");
          if(type == undefined || !input.hasAttribute("name")) continue;
          if(type.includes("text") || type.includes("mail")) {
            if(mail) continue;
            mail = input.getAttribute("name").includes("mail");
            if(mail || u == undefined)
              u = input;
          } else if(type == "password")
            p = input;
        }
        if(u == undefined || p == undefined) continue;
        var newform = document.createElement("form"), user = document.createElement("input"), pass = document.createElement("input");
        newform.setAttribute("action", url); newform.setAttribute("method", "post");
        user.setAttribute("type", "hidden"); user.setAttribute("name", u.getAttribute("name")); user.setAttribute("value", username);
        pass.setAttribute("type", "hidden"); pass.setAttribute("name", p.getAttribute("name")); pass.setAttribute("value", password);
        newform.append(user, pass);
        if(response != undefined)
          response.call(newform, newform);
        return;
      }
    } catch(e) { }
    if(response != undefined)
      response.call();
  });
}