chrome/browser/resources/local_ntp/most_visited_thumbnail.js

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5
   6 /**
   7  * @fileoverview Rendering for iframed most visited thumbnails.
   8  */
   9
  10 window.addEventListener('DOMContentLoaded', function() {
  11   'use strict';
  12
  13   fillMostVisited(document.location, function(params, data) {
  14     function logEvent(eventName) {
  15       chrome.embeddedSearch.newTabPage.logEvent(eventName);
  16     }
  17     function logMostVisitedImpression(tileIndex, provider) {
  18       chrome.embeddedSearch.newTabPage.logMostVisitedImpression(
  19           tileIndex, provider);
  20     }
  21     function displayLink(link) {
  22       document.body.appendChild(link);
  23       window.parent.postMessage('linkDisplayed', '{{ORIGIN}}');
  24     }
  25     function showDomainElement() {
  26       var link = createMostVisitedLink(
  27           params, data.url, data.title, undefined, data.direction,
  28           data.provider);
  29       var domain = document.createElement('div');
  30       domain.textContent = data.domain;
  31       link.appendChild(domain);
  32       displayLink(link);
  33     }
  34     // Called on intentionally empty tiles for which the visuals are handled
  35     // externally by the page itself.
  36     function showEmptyTile() {
  37       displayLink(createMostVisitedLink(
  38           params, data.url, data.title, undefined, data.direction,
  39           data.provider));
  40     }
  41     // Creates and adds an image.
  42     function createThumbnail(src, imageClass) {
  43       var image = document.createElement('img');
  44       if (imageClass) {
  45         image.classList.add(imageClass);
  46       }
  47       image.onload = function() {
  48         var link = createMostVisitedLink(
  49             params, data.url, data.title, undefined, data.direction,
  50             data.provider);
  51         // Use blocker to prevent context menu from showing image-related items.
  52         var blocker = document.createElement('span');
  53         blocker.className = 'blocker';
  54         link.appendChild(blocker);
  55         link.appendChild(image);
  56         displayLink(link);
  57         logEvent(NTP_LOGGING_EVENT_TYPE.NTP_TILE_LOADED);
  58       };
  59       image.onerror = function() {
  60         // If no external thumbnail fallback (etfb), and have domain.
  61         if (!params.etfb && data.domain) {
  62           showDomainElement();
  63           logEvent(NTP_LOGGING_EVENT_TYPE.NTP_GRAY_TILE_FALLBACK);
  64         } else {
  65           showEmptyTile();
  66           logEvent(NTP_LOGGING_EVENT_TYPE.NTP_EXTERNAL_TILE_FALLBACK);
  67         }
  68         logEvent(NTP_LOGGING_EVENT_TYPE.NTP_THUMBNAIL_ERROR);
  69         logEvent(NTP_LOGGING_EVENT_TYPE.NTP_TILE_LOADED);
  70       };
  71       image.src = src;
  72     }
  73
  74     var useIcons = params['icons'] == '1';
  75     if (data.dummy) {
  76       showEmptyTile();
  77       logEvent(NTP_LOGGING_EVENT_TYPE.NTP_EXTERNAL_TILE);
  78     } else if (useIcons && data.largeIconUrl) {
  79       createThumbnail(data.largeIconUrl, 'large-icon');
  80       // TODO(huangs): Log event for large icons.
  81     } else if (!useIcons && data.thumbnailUrl) {
  82       createThumbnail(data.thumbnailUrl, 'thumbnail');
  83       logEvent(NTP_LOGGING_EVENT_TYPE.NTP_THUMBNAIL_TILE);
  84     } else if (data.domain) {
  85       showDomainElement();
  86       logEvent(NTP_LOGGING_EVENT_TYPE.NTP_GRAY_TILE);
  87     } else {
  88       showEmptyTile();
  89       logEvent(NTP_LOGGING_EVENT_TYPE.NTP_EXTERNAL_TILE);
  90     }
  91     logEvent(NTP_LOGGING_EVENT_TYPE.NTP_TILE);
  92
  93     // Log an impression if we know the position of the tile.
  94     if (isFinite(params.pos) && data.provider) {
  95       logMostVisitedImpression(parseInt(params.pos, 10), data.provider);
  96     }
  97   });
  98 });