Method getData

3p/iframe-messaging-client.js:49–62

* Retrieves data from host. * * @param {string} requestType * @param {?Object} payload * @param {function(*)} callback

(requestType, payload, callback)

   * @param {function(*)} callback
   */
  getData(requestType, payload, callback) {
    const responseType = requestType + CONSTANTS.responseTypeSuffix;
    const messageId = this.nextMessageId_++;
    const unlisten = this.registerCallback(responseType, (result) => {
      if (result[CONSTANTS.messageIdFieldName] === messageId) {
        unlisten();
        callback(result[CONSTANTS.contentFieldName]);
      }
    });
    const data = {};
    data[CONSTANTS.payloadFieldName] = payload;
    data[CONSTANTS.messageIdFieldName] = messageId;
    this.sendMessage(requestType, data);
  }

  /**
   * Make an event listening request.