issue 1526 - Implement new options page design for Chrome/Opera/Safari

options.js

+/*
+ * This file is part of Adblock Plus <https://adblockplus.org/>,
+ * Copyright (C) 2006-2015 Eyeo GmbH
+ *
+ * Adblock Plus is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 3 as
+ * published by the Free Software Foundation.
+ *
+ * Adblock Plus is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+"use strict";
+
+(function()
+{
+  var optionSubscriptions = {};
+  var acceptableAdsUrl = null;

[Thomas Greiner, 2015/01/30 13:55:51]

Don't save that URL as a separate variable or you'll have a race condition if
you access this variable before calling `getAcceptableAdsURL()`. Therefore
always call `getAcceptableAdsURL()` to ensure that the variable exists.

Same for `optionSubscriptions` but for that the `loadRecommendations()` function
needs to be changed to cache the result like `getAcceptableAdsURL()` does.

[saroyanm, 2015/02/26 12:18:32]

Done, but without caching Recommendation, now I'm populating it for scratch for
current implementation consistency.

+  
+  function onDOMLoaded()
+  {
+    initTabs();
+    updateVersionNumber();
+    updateShareLink();
+    populateLists();
+    
+    E("find-language").setAttribute("placeholder", ext.i18n.getMessage("options_modal_language_find"));
+    setLinks("block-element-explanation", "#");

[Thomas Greiner, 2015/01/30 13:55:51]

No need to set the `src` attribute of anchor tags if we don't intend to use them
as hyperlinks.

[saroyanm, 2015/02/26 12:18:32]

Not using setLinks in currently uploaded patch.

+    
+    E("add-blocking-list").addEventListener("click", Modal.open, false);

[Thomas Greiner, 2015/01/30 13:55:51]

I noticed you have a ton of event listeners. Instead of assigning an event
listener to each element individually, you could react to clicks on a higher
level in the DOM hierarchy and check which element it comes from to determine
which action to take.

[saroyanm, 2015/02/26 12:18:32]

Most of them already not exist, let me know if it's make sense to use on
whitelisting event listeners.

[Thomas Greiner, 2015/03/05 11:36:03]

Yes, it definitely makes sense to combine the listeners for the controls wrapper
for the domain whitelisting section.

[saroyanm, 2015/03/06 11:54:32]

Done.

+    E("add-website-language").addEventListener("click", Modal.open, false);
+    E("modal-close").addEventListener("click", Modal.close, false);
+    E("whitelisting-add-icon").addEventListener("click", whitelistDomainBtnClick, false);
+    E("whitelisting-add-btn").addEventListener("click", whitelistDomainBtnClick, false);
+    E("whitelisting-enter-icon").addEventListener("click", whitelistDomainBtnClick, false);
+    E("whitelisting-textbox").addEventListener("keypress", function(e) {

[Thomas Greiner, 2015/01/30 13:55:51]

Nit: Opening braces should be in next line.

[Thomas Greiner, 2015/01/30 13:55:51]

Here you're using `e` as the name for an Event whereas further down you've
chosen `ev`. Please be consistent and use `ev`.

[saroyanm, 2015/02/26 12:18:32]

I've changed to use `e` from some point, let me know if I should change to `ev`
again.

[saroyanm, 2015/02/26 12:18:32]

Done.

[Thomas Greiner, 2015/03/05 11:36:03]

No need to as long as it's consistent.

+      if (e.keyCode == 13)

[Thomas Greiner, 2015/01/30 13:55:51]

Please avoid using magical numbers. Unfortunately, the current state of keyboard
events is suboptimal (see
https://developer.mozilla.org/en-US/docs/Web/Events/keypress) so you need to (1)
make sure that it works on different operating systems and (2) add a comment
explaining which key this key code is supposed to correspond to.

[saroyanm, 2015/02/26 12:18:32]

Done.

+        whitelistDomainBtnClick();
+    }, false);
+    E("whitelisting-cancel-btn").addEventListener("click", function(){

[Thomas Greiner, 2015/01/30 13:55:51]

Nit: Opening braces should be in next line.

[saroyanm, 2015/02/26 12:18:32]

Done.

+      E("whitelisting-textbox").value = "";
+    }, false);
+    E("allow-whitelist-cb").addEventListener("click", toggleAcceptableAds, false);
+    E("import-blockingList-btn").addEventListener("click", importListBtnCLick, false);

[Thomas Greiner, 2015/01/30 13:55:51]

Calling this function `importList` should be more than sufficient. No need to
reference anything about the UI.

[saroyanm, 2015/02/26 12:18:32]

I don't have this function anymore.

+    E("edit-ownBlockingList-btn").addEventListener("click", editOwnRulsBtnClick, false);

[Thomas Greiner, 2015/01/30 13:55:51]

Calling this function `editCustomFilters` should be more than sufficient. No
need to reference anything about the UI.

Please also stick to common terminology in the code which might differ from how
we call something in the UI (e.g. blocking lists -> subscription, own rules ->
custom filters, etc.).

[saroyanm, 2015/02/26 12:18:32]

Done.

+    E("find-language").addEventListener("keyup", searchLanguage, false);
+  }
+  
+  function initTabs()
+  {
+    var showContent = function(tab)
+    {
+      var tab = tab.querySelector(".tabs li.active");
+      if (tab.dataset.show)
+        E(tab.dataset.show).style.display = "block";
+    };
+    var optionList = document.querySelectorAll('.tabs li[data-show]');
+    for (var i = 0; i < optionList.length; ++i)
+    {
+      optionList[i].addEventListener("click", function(ev)
+      {
+        var tab = this.parentNode.querySelector(".active");
+        tab.classList.remove("active");
+        this.classList.add("active");
+        E(tab.dataset.show).style.display = "none";;
+        showContent(this.parentNode);
+      }, false);
+    }
+    showContent(E("main-navigation-tabs"));
+    showContent(E("blocking-list-tabs"));
+  }
+  
+  var Modal =
+  {
+    open: function (content)

[Thomas Greiner, 2015/01/30 13:55:51]

This function is being called inconsistently. Sometimes you call it with
`Modal.open(String)` and sometimes with `Modal.open(Event)` by defining it as an
event listener.

I assume that's why you're checking for `this` a few lines below.

[saroyanm, 2015/02/26 12:18:32]

Now we are using CSS to show the modal.

+    {
+      var modal = E("modal");
+      var content = E(this && this.dataset ? this.dataset.show : content);
+      content.style.display = "block";
+      modal.style.visibility = "visible";
+      E("modal-background").style.display = "block";
+      if (content.dataset.title)
+        E("modal-title").innerHTML = ext.i18n.getMessage(content.dataset.title);
+      modal.style.marginTop = -(modal.clientHeight/2)+"px";

[Thomas Greiner, 2015/01/30 13:55:51]

Calculating layout is the job of the browser so stick with CSS here. Flexbox
makes this much easier than it used to be (example:
http://philipwalton.github.io/solved-by-flexbox/demos/vertical-centering/).

[saroyanm, 2015/02/26 12:18:32]

Done.

+    },
+    close: function ()
+    {
+      var contents = E("modal-content").childNodes;
+      for (var i = 0; i < contents.length; ++i)
+      {
+        if (contents[i].style)
+          contents[i].style.display = "none";
+      }
+      E("modal-background").style.display = "none";
+      E("modal").style.visibility = "hidden";
+    }
+  }
+  
+  function populateLists()
+  {
+    ext.backgroundPage.sendMessage({
+      type: "subscriptions.get",
+      special: true
+    }, function(subscriptions)
+    {
+      for (var i = 0; i < subscriptions.length; i++)
+      {
+        ext.backgroundPage.sendMessage({
+          type: "filters.get",
+          subscriptionUrl: subscriptions[i].url
+        }, function(filters)
+        {
+          var whitelistArray = [];
+          for (var i = 0; i < filters.length; i++)
+          {
+            var match = filters[i].text.match(/^@@\|\|([^\/:]+)\^\$document$/);
+            if (match[1])
+            {
+              whitelistArray.push(match[1]);
+            }
+            else
+            {
+              // TODO: add `filters[i].text` to list of custom filters
+            }
+          }
+          
+          if (whitelistArray.length > 0)
+          {
+            whitelistArray.sort();
+            for (var i = 0; i < whitelistArray.length; i++)
+            {
+              var domain = whitelistArray[i];
+              E("whitelisting-table").appendChild(createWhitelistElem(domain));
+            }
+          }
+        });
+      }
+    });
+    
+    loadRecommendations(function(recommends)

[Thomas Greiner, 2015/01/30 13:55:51]

You're calling it "recommends" here but "recommendations" below. Please make the
variable name consistent.

[saroyanm, 2015/02/26 12:18:32]

Done.

+    {
+      ext.backgroundPage.sendMessage({
+        type: "subscriptions.get",
+        downloadable: true
+      }, function(subscriptions)
+      {
+        getAcceptableAdsURL(function(url)
+        {
+          acceptableAdsUrl = url;
+          for (var i = 0; i < subscriptions.length; i++)
+          {
+            if (subscriptions[i].url == acceptableAdsUrl)
+            {
+              getCheckboxSibling(E("allow-whitelist-cb")).checked = !subscriptions[i].disabled;
+              continue;
+            }
+ 
+            var subscription = recommends[subscriptions[i].url];
+            if (!subscription)
+              recommends[subscriptions[i].url] = subscriptions[i];

[Thomas Greiner, 2015/01/30 13:55:51]

Please keep both lists separate since they contain two different kinds of
subscriptions data.

[saroyanm, 2015/02/26 12:18:32]

Done.

+            else
+            {
+              subscription.disabled = subscriptions[i].disabled;
+              if (subscription.type == "ads")
+                subscription.isAdded = true;
+            }
+          }
+          for (var key in recommends)
+            addOptionItem(recommends[key]);
+        });
+      });
+    });
+  }
+  
+  function loadRecommendations(callback)
+  {
+    var recommendations = {};
+    var request = new XMLHttpRequest();
+    request.open("GET", "subscriptions.xml");
+    request.onload = function()
+    {
+      var list = document.getElementById("subscriptionSelector");
+      var elements = request.responseXML.documentElement.getElementsByTagName("subscription");
+      for (var i = 0; i < elements.length; i++)
+      {
+        var element = elements[i];
+        var subscription = {};
+        subscription.title = element.getAttribute("title");
+        subscription.url = element.getAttribute("url");
+        subscription.disabled = true;
+        var prefix = element.getAttribute("prefixes");
+        if (prefix)
+        {
+          subscription.prefixes = element.getAttribute("prefixes");
+          subscription.type = "ads";
+          subscription.display = ext.i18n.getMessage("options_language_"+subscription.prefixes.replace(/,/g, '_'));
+        }
+        else
+          subscription.display = element.getAttribute("specialization");
+        
+        var popular = element.getAttribute("popular");
+        if (popular)
+          subscription.popular = element.getAttribute("popular");
+        
+        recommendations[subscription.url] = subscription;
+      }
+      optionSubscriptions = recommendations;
+      callback(recommendations);
+    }
+    request.send();
+  }
+  
+  function searchLanguage()
+  {
+    var searchVal = this.value;
+    var items = E("all-lang-table").childNodes;
+    for (var i = 0; i < items.length; ++i)
+    {
+      var item = items[i];
+      var language = item.getElementsByTagName("span")[1].innerHTML;
+      if (language.toLowerCase().indexOf(searchVal.toLowerCase()) > -1)
+        item.style.display = "block";
+      else
+        item.style.display = "none";
+    }
+  }
+  
+  function addOptionItem(subscription)
+  {
+    var display = subscription.display ? subscription.display : subscription.title;
+    var getPossition = function(elements, subscription)
+    {
+      var localArray = [];
+      for (var i = 0; i < elements.length; i++)
+      {
+        var elem = elements[i];
+        localArray.push(elem);
+      }
+      
+      localArray.push(subscription);
+      return localArray.sort(function(a, b) {
+        var aPopular = a.getElementsByClassName("popular").length > 0;
+        var bPopular = b.getElementsByClassName("popular").length > 0;
+        if(aPopular == bPopular)
+        {
+          var aValue = a.getElementsByClassName("display")[0].innerHTML.toLowerCase();
+          var bValue = b.getElementsByClassName("display")[0].innerHTML.toLowerCase();
+          if (aValue < bValue)
+            return -1;
+          if (aValue > bValue)
+            return 1;
+          return 0;
+        }
+        if (aPopular == "true")
+          return 1;
+        else
+          return -1;
+      }).indexOf(subscription);
+    };
+    
+    var checkBoxClick = function()
+    {
+      toggleSubscription(subscription);
+    };
+    
+    var appendToTable = function(table, elem)
+    {
+      var elements = table.getElementsByTagName("li");
+      if (elements.length == 0)
+        table.appendChild(elem);
+      else
+      {
+        var possition = getPossition(elements, elem);
+        table.insertBefore(elem, table.childNodes[possition]);
+      }
+    };
+    
+    if (subscription.type && subscription.type == "ads")
+    {
+      if (!subscription.isAdded)
+      {
+        var listElem = generateListElement(subscription, subscription.display, "add");
+        listElem.dataset.url = subscription.url;
+        listElem._subscription = subscription;
+        listElem.getElementsByTagName("button")[0].addEventListener("click", function()
+        {
+          addSubscription(this.dataset.url);
+        }.bind(listElem), false);
+        appendToTable(E("all-lang-table"), listElem);
+      }
+      else
+      {
+        var listElem = generateListElement(subscription, display, "checkbox");
+        listElem.dataset.url = subscription.url;
+        listElem._subscription = subscription;
+        listElem.getElementsByTagName("span")[0].addEventListener("click", checkBoxClick, false);
+        appendToTable(E("blocking-languages-table"), listElem);
+        var listElem = generateListElement(subscription, display);
+        listElem.dataset.url = subscription.url;
+        listElem._subscription = subscription;
+        appendToTable(E("blocking-languages-modal-table"), listElem);
+      }
+    }
+    else
+    {
+      var listElem = generateListElement(subscription, display, "checkbox");
+      listElem.dataset.url = subscription.url;
+      listElem._subscription = subscription;
+      listElem.getElementsByTagName("span")[0].addEventListener("click", checkBoxClick, false);
+      appendToTable(E("further-list-table"), listElem);
+    }
+  }
+  
+  function addLanguageSubscription(subscription)
+  {
+    var optionSubscription = getOptionSubscription(subscription.url);
+    var elems = getElementsByUrl(subscription.url);
+    for (var i = 0; i < elems.length; i++)
+      elems[i].parentNode.removeChild(elems[i]);
+    optionSubscription.isAdded = true;
+    optionSubscription.disabled = false;
+    addOptionItem(optionSubscription);
+  }
+  
+  function createWhitelistElem(domain)
+  {
+    var listElem = generateListElement(null, domain, "delete");
+    listElem.dataset.domain = domain;
+    listElem.getElementsByTagName("button")[0].addEventListener("click", removeWhitelistBtnClick.bind(listElem), false);
+    return listElem;
+  }
+  
+  function addFurtherList(subscription)
+  {
+    var optionSubscription = getOptionSubscription(subscription.url);
+    if (optionSubscription)
+    {
+      optionSubscription.disabled = false;
+      addOptionItem(optionSubscription);
+    }
+    else
+    {
+      optionSubscriptions[subscription.url] = subscription;
+      addOptionItem(subscription);
+    }
+  }
+  
+  function updateSubscriptionState(subscription, state)
+  {
+    var elem = getElementsByUrl(subscription.url);
+    if (elem.length > 0)
+    {
+      for (var i = 0; i < elem.length; i++)
+      {
+        var checkbox = elem[i].getElementsByTagName("input")[0];
+        if (checkbox)
+          checkbox.checked = state;
+      }
+    }
+    else
+    {
+      if (subscription.url == acceptableAdsUrl)
+        getCheckboxSibling(E("allow-whitelist-cb")).checked = state;
+      else
+        addFurtherList(subscription);
+    }
+  }
+  
+  function getElementsByUrl(url)
+  {
+    return document.querySelectorAll("[data-url='"+url+"']");
+  }
+  
+  function generateListElement(subscription, text, type)
+  {
+    var list = document.createElement("li");
+    if (type == "checkbox")
+    {
+      var input = document.createElement("input");
+      input.setAttribute("type", "checkbox");
+      if (subscription.disabled == false)
+        input.checked = true;
+      list.appendChild(input);
+      var span = document.createElement("span");
+      list.appendChild(span);
+    }
+    else if (type == "delete")
+    {
+      var button = document.createElement("button");
+      button.setAttribute("class", "delete");
+      list.appendChild(button);
+    }
+    else if (type == "add")
+    {
+      var button = document.createElement("button");
+      button.setAttribute("class", "button-add");
+      var span = document.createElement("span");
+      span.innerHTML = "+" + ext.i18n.getMessage("options_btn_add");
+      button.appendChild(span);
+      list.appendChild(button);
+    }
+    var span = document.createElement("span");
+    span.setAttribute("class", "display");
+    span.innerHTML = text;
+    list.appendChild(span);
+    
+    if (subscription && subscription.popular == "true")
+    {
+      var popular = document.createElement("span");
+      popular.setAttribute("class", "popular");
+      popular.innerHTML = "popular";
+      list.appendChild(popular);
+    }
+    
+    return list;
+  }
+  
+  function getOptionSubscription(url)
+  {
+    return optionSubscriptions[url];
+  }
+
+  function importListBtnCLick()
+  {
+    var url = E("blockingList-textbox").value;
+    addSubscription(url);
+    Modal.close();
+  }
+  
+  function whitelistDomainBtnClick()
+  {
+    var domain = E("whitelisting-textbox").value;
+    if (domain)
+      addWhitelistedDomain(domain);
+  }
+  
+  function removeWhitelistBtnClick()
+  {
+    removeWhitelistedDomain(this.dataset.domain);
+  }
+  
+  function editOwnRulsBtnClick()
+  {
+    
+  }
+  
+  function showAddSubscriptionDialog(action, subscription)
+  {
+    E("blockingList-textbox").value = subscription.url;
+    Modal.open("further-blocking-modal");
+  }
+  
+  function getAcceptableAdsURL(callback)
+  {
+    ext.backgroundPage.sendMessage({
+      type: "prefs.get",
+      key: "subscriptions_exceptionsurl"
+    }, function(value)
+    {
+      getAcceptableAdsURL = function(callback)
+      {
+        callback(value);
+      }
+      getAcceptableAdsURL(callback);
+    });
+  }
+
+  function toggleSubscription(subscription)
+  {
+    ext.backgroundPage.sendMessage({
+      type: "subscriptions.toggle",
+      url: subscription.url,
+      title: subscription.title,
+      homepage: subscription.homepage
+    });
+  }
+
+  function toggleAcceptableAds()
+  {
+    var acceptableCheckbox = getCheckboxSibling(this);
+    getAcceptableAdsURL(function(url)
+    {
+      var isChecked = acceptableCheckbox.checked;
+      var title = "Allow non-intrusive advertising";
+      if (isChecked)
+        removeSubscription(url);
+      else
+        addSubscription(url, title);
+    });
+  }
+
+  function addSubscription(url, title, homepage)
+  {
+    var message = {
+      type: "subscriptions.add",
+      url: url
+    };
+    if (title)
+      message.title = title;
+    if (homepage)
+      message.homepage = homepage;
+
+    ext.backgroundPage.sendMessage(message);
+  }
+
+  function removeSubscription(url)
+  {
+    ext.backgroundPage.sendMessage({
+      type: "subscriptions.remove",
+      url: url
+    });
+  }
+
+  function addWhitelistedDomain(domain)
+  {
+    ext.backgroundPage.sendMessage({
+      type: "filters.add",
+      text: "@@||" + domain.toLowerCase() + "^$document"
+    });
+  }
+
+  function removeWhitelistedDomain(domain)
+  {
+    ext.backgroundPage.sendMessage({
+      type: "filters.remove",
+      text: "@@||" + domain.toLowerCase() + "^$document"
+    });
+  }
+
+  function onFilterMessage(action, filter)
+  {
+    switch (action)
+    {
+      case "added":
+        var match = filter.text.match(/^@@\|\|([^\/:]+)\^\$document$/);
+        if (match[1])
+        {
+          var whitelistTbl =  E("whitelisting-table");
+          var items = whitelistTbl.getElementsByClassName("display");
+          var domains = [];
+          for (var i = 0; i < items.length; i++)
+          {
+            domains.push(items[i].innerHTML);
+          }
+          var domain = match[1];
+          domains.push(domain);
+          domains.sort();
+          
+          whitelistTbl.insertBefore(createWhitelistElem(domain), whitelistTbl.childNodes[domains.indexOf(domain)]);
+          E("whitelisting-textbox").value = "";
+        }
+        else
+        {
+          // TODO: add `filters[i].text` to list of custom filters
+        }
+        break;
+      case "loaded":
+        populateLists();
+        break;
+      case "removed":
+        var match = filter.text.match(/^@@\|\|([^\/:]+)\^\$document$/);
+        if (match[1])
+        {
+          var elem = document.querySelector("[data-domain='"+match[1]+"']");
+          elem.parentNode.removeChild(elem);
+        }
+        break;
+    }
+  }
+  
+  function onSubscriptionMessage(action, subscription)
+  {
+    switch (action)
+    {
+      case "added":
+        var optionSubscription = getOptionSubscription(subscription.url);
+        if (optionSubscription)
+        {
+          var isAdsType = optionSubscription.type && optionSubscription.type == "ads";
+          if (isAdsType && !optionSubscription.isAdded)
+            addLanguageSubscription(subscription);
+          else
+            updateSubscriptionState(subscription, true);
+        }
+        else if (subscription.url == acceptableAdsUrl)
+          updateSubscriptionState(subscription, true);
+        else
+          addFurtherList(subscription);
+        break;
+      case "disabled":
+        updateSubscriptionState(subscription, false);
+        break;
+      case "homepage":
+        // TODO: NYI
+        break;
+      case "removed":
+        updateSubscriptionState(subscription, false);
+        break;
+      case "title":
+        // TODO: NYI
+        break;
+    }
+  }
+  
+  function updateShareLink()
+  {
+    ext.backgroundPage.sendMessage({
+      type: "filters.blocked",
+      url: "https://platform.twitter.com/widgets/",
+      requestType: "SCRIPT",
+      docDomain: "adblockplus.org",
+      thirdParty: true
+    }, function(blocked)
+    {
+      // TODO: modify "share" link accordingly
+    });
+  }
+  
+  function updateVersionNumber()
+  {
+    ext.backgroundPage.sendMessage({
+    method: "app.get",
+    what: "addonVersion"
+    }, function(addonVersion)
+    {
+      E("abp-version").innerHTML = addonVersion;
+    });
+  }
+  
+  function getDocLink(link, callback)
+  {
+    ext.backgroundPage.sendMessage({
+      type: "app.get",
+      what: "doclink",
+      link: link
+    }, callback);
+  }
+  
+  function setLinks(id)
+  {
+    var element = E(id);
+    if (!element)
+    {
+      return;
+    }
+
+    var links = element.getElementsByTagName("a");
+
+    for (var i = 0; i < links.length; i++)
+    {
+      if (typeof arguments[i + 1] == "string")
+      {
+        links[i].href = arguments[i + 1];
+        links[i].setAttribute("target", "_blank");
+      }
+      else if (typeof arguments[i + 1] == "function")
+      {
+        links[i].href = "javascript:void(0);";
+        links[i].addEventListener("click", arguments[i + 1], false);
+      }
+    }
+  }
+  
+  function E(id)
+  {
+    return document.getElementById(id);
+  }
+  
+  function getCheckboxSibling(element)
+  {
+    var parent = element.parentNode;
+    for (var i=0; i < parent.childNodes.length; i++)
+    {
+      if (parent.childNodes[i] && parent.childNodes[i].type == "checkbox")
+        return parent.childNodes[i];
+    }
+  }
+
+  ext.onMessage.addListener(function(message)
+  {
+    switch (message.type)
+    {
+      case "app.listen":
+        if (message.action == "addSubscription")
+        {
+          message.args.unshift(message.action);
+          showAddSubscriptionDialog.apply(null, message.args);
+        }
+        break;
+      case "filters.listen":
+        message.args.unshift(message.action);
+        onFilterMessage.apply(null, message.args);
+        break;
+      case "subscriptions.listen":
+        message.args.unshift(message.action);
+        onSubscriptionMessage.apply(null, message.args);
+        break;
+    }
+  });
+  
+  ext.backgroundPage.sendMessage({
+    type: "app.listen",
+    filter: ["addSubscription"]
+  });
+  ext.backgroundPage.sendMessage({
+    type: "filters.listen",
+    filter: ["added", "loaded", "removed"]
+  });
+  ext.backgroundPage.sendMessage({
+    type: "subscriptions.listen",
+    filter: ["added", "disabled", "homepage", "removed", "title"]
+  });
+  
+  window.addEventListener("DOMContentLoaded", onDOMLoaded, false);
+})();