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Editing: xdLocalStorage.js

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'use strict';
window.XdUtils = window.XdUtils || (function () {

//public interface
  return {
    extend: extend
  };
})();

function applyCallback(data) {
    if (requests[data.id]) {
      requests[data.id](data);
      delete requests[data.id];
    }
  }

function buildMessage(action, key, value, callback) {
    requestId++;
    requests[requestId] = callback;
    var data = {
      namespace: MESSAGE_NAMESPACE,
      id: requestId,
      action: action,
      key: key,
      value: value
    };
    iframe.contentWindow.postMessage(JSON.stringify(data), '*');
  }

function init(customOptions) {
    options = XdUtils.extend(customOptions, options);
    var temp = document.createElement('div');

if (window.addEventListener) {
      window.addEventListener('message', receiveMessage, false);
    } else {
      window.attachEvent('onmessage', receiveMessage);
    }

temp.innerHTML = '<iframe id="' + options.iframeId + '" src="' + options.iframeUrl + '" style="display: none;"></iframe>';
    document.body.appendChild(temp);
    iframe = document.getElementById(options.iframeId);
  }

function isDomReady() {
    return (document.readyState === 'complete');
  }

return {
    //callback is optional for cases you use the api before window load.
    init: function (customOptions) {
      if (!customOptions.iframeUrl) {
        throw 'You must specify iframeUrl';
      }
      if (wasInit) {
        console.log('xdLocalStorage was already initialized!');
        return;
      }
      wasInit = true;
      if (isDomReady()) {
        init(customOptions);
      } else {
        if (document.addEventListener) {
          // All browsers expect IE < 9
          document.addEventListener('readystatechange', function () {
            if (isDomReady()) {
              init(customOptions);
            }
          });
        } else {
          // IE < 9
          document.attachEvent('readystatechange', function () {
            if (isDomReady()) {
              init(customOptions);
            }
          });
        }
      }
    },
    setItem: function (key, value, callback) {
      if (!isApiReady()) {
        return;
      }
      buildMessage('set', key, value, callback);
    },

getItem: function (key, callback) {
      if (!isApiReady()) {
        return;
      }
      buildMessage('get', key, null, callback);
    },
    removeItem: function (key, callback) {
      if (!isApiReady()) {
        return;
      }
      buildMessage('remove', key, null, callback);
    },
    key: function (index, callback) {
      if (!isApiReady()) {
        return;
      }
      buildMessage('key', index, null, callback);
    },
    getSize: function (callback) {
      if (!isApiReady()) {
        return;
      }
      buildMessage('size', null, null, callback);
    },
    getLength: function (callback) {
      if (!isApiReady()) {
        return;
      }
      buildMessage('length', null, null, callback);
    },
    clear: function (callback) {
      if (!isApiReady()) {
        return;
      }
      buildMessage('clear', null, null, callback);
    },
    wasInit: function () {
      return wasInit;
    }
  };
})();

Editing: xdLocalStorage.js

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