Standartified AJAX reply

jsonresponse.js

const JSONResponse_STATUS_OK = 'OK', JSONResponse_STATUS_ERROR = 'ERROR';
/**
 * JSONResponseParse
 * @param text Unparsed text of server response
 * @constructor
 */
function JSONResponseParse(text) {
  try {
    if (typeof text !== 'string') {
      throw 'JSONResponse: Can\'t parse - not a string';
    }
    if (text.length < 28) {
      throw 'JSONResponse: Can\'t parse - too short';
    }
    if (text.substr(0, 27) !== 'while(1){/*JSONResponse*/}[') {
      throw 'JSONResponse: Can\'t parse - not a valid JSONResponse';
    }
    text = text.substr(27, text.length - 28);
    return new JSONResponse(text);
  }
  catch (err) {
    console.log(err);
  }
  return false;
}


function JSONResponse(text) {
  /*
   Used only for autocomplete in IDE
   */
  this.status = 'OK';
  this.messages = [{text: '', type: '', label: ''}];
  this.data = [];
  this.redirect = {url: '', delay: 0};
  /**
   * Draws a single message. To draw all messages use drawAllMessages().
   * @param message array with message params
   */
  this.drawMessage = function (message) {
  };
  this.drawAllMessages = function () {
  };

  var r = JSON.parse(text);
  r.drawMessage = function (message) {
    var r = '<div class="alert alert-' + message.type + '" role="alert">';
    if (message.label) {
      r += '<strong>' + message.label + '</strong> ';
    }
    r += message.text;
    r += '</div>';
    $('#ui-messages').append($(r));
  };
  r.drawAllMessages = function () {
    $.each(r.messages, function (k, v) {
      r.drawMessage(v);
    })
  };
  r.popupFirstMessage = function () {
    if (typeof r.messages[0] === 'undefined') {
      return false;
    }
    var bootsrap2swal = {
      danger: 'error',
      warning: 'warning',
      success: 'success',
      info: 'info'
    };
    swal(r.messages[0].label, r.messages[0].text, bootsrap2swal[r.messages[0].type]);
  };
  r.checkRedirect = function () {
    if (typeof r.redirect === 'undefined') {
      return false;
    }
    ;
    if (typeof r.redirect.url === 'undefined') {
      return false;
    }
    ;
    if (r.redirect.url) {
      return true;
    }
    return false;
  }
  r.doRedirect = function () {
    if (r.checkRedirect()) {
      if (typeof r.redirect.delay === 'undefined') {
        r.redirect.delay = 0;
      }
      setTimeout(function () {
        window.location.href = r.redirect.url;
      }, r.redirect.delay);
    }
  }
  return r;
}