text: // Copyright 2008 The Closure Library Authors. All Rights Reserved.
  //
  // Licensed under the Apache License, Version 2.0 (the "License");
  // you may not use this file except in compliance with the License.
  // You may obtain a copy of the License at
  //
  //      http://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing, software
  // distributed under the License is distributed on an "AS-IS" BASIS,
  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  // See the License for the specific language governing permissions and
  // limitations under the License.
  
  /**
   * @fileoverview A dialog for editing/creating a link.
   */
  
  goog.provide('goog.ui.editor.LinkDialog');
  goog.provide('goog.ui.editor.LinkDialog.BeforeTestLinkEvent');
  goog.provide('goog.ui.editor.LinkDialog.EventType');
  goog.provide('goog.ui.editor.LinkDialog.OkEvent');
  
  goog.require('goog.a11y.aria');
  goog.require('goog.a11y.aria.State');
  goog.require('goog.dom');
  goog.require('goog.dom.InputType');
  goog.require('goog.dom.TagName');
  goog.require('goog.dom.safe');
  goog.require('goog.editor.BrowserFeature');
  goog.require('goog.editor.Link');
  goog.require('goog.editor.focus');
  goog.require('goog.editor.node');
  goog.require('goog.events.Event');
  goog.require('goog.events.EventHandler');
  goog.require('goog.events.InputHandler');
  goog.require('goog.html.SafeHtml');
  goog.require('goog.html.SafeHtmlFormatter');
  goog.require('goog.string');
  goog.require('goog.string.Unicode');
  goog.require('goog.style');
  goog.require('goog.ui.Button');
  goog.require('goog.ui.Component');
  goog.require('goog.ui.LinkButtonRenderer');
  goog.require('goog.ui.editor.AbstractDialog');
  goog.require('goog.ui.editor.TabPane');
  goog.require('goog.ui.editor.messages');
  goog.require('goog.userAgent');
  goog.require('goog.window');
  
  
  
  /**
   * A type of goog.ui.editor.AbstractDialog for editing/creating a link.
   * @param {goog.dom.DomHelper} domHelper DomHelper to be used to create the
   *     dialog's dom structure.
   * @param {goog.editor.Link} link The target link.
   * @constructor
   * @extends {goog.ui.editor.AbstractDialog}
   * @final
   */
  goog.ui.editor.LinkDialog = function(domHelper, link) {
    goog.ui.editor.LinkDialog.base(this, 'constructor', domHelper);
  
    /**
     * The link being modified by this dialog.
     * @type {goog.editor.Link}
     * @private
     */
    this.targetLink_ = link;
  
    /**
     * The event handler for this dialog.
     * @type {goog.events.EventHandler<!goog.ui.editor.LinkDialog>}
     * @private
     */
    this.eventHandler_ = new goog.events.EventHandler(this);
    this.registerDisposable(this.eventHandler_);
  
    /**
     * Optional warning to show about email addresses.
     * @type {?goog.html.SafeHtml}
     * @private
     */
    this.emailWarning_ = null;
  
    /**
     * Whether to show a checkbox where the user can choose to have the link open
     * in a new window.
     * @type {boolean}
     * @private
     */
    this.showOpenLinkInNewWindow_ = false;
  
    /**
     * Whether to focus the text to display input instead of the url input if the
     * text to display input is empty when the dialog opens.
     * @type {boolean}
     * @private
     */
    this.focusTextToDisplayOnOpenIfEmpty_ = false;
  
    /**
     * Whether the "open link in new window" checkbox should be checked when the
     * dialog is shown, and also whether it was checked last time the dialog was
     * closed.
     * @type {boolean}
     * @private
     */
    this.isOpenLinkInNewWindowChecked_ = false;
  
    /**
     * Whether to show a checkbox where the user can choose to have 'rel=nofollow'
     * attribute added to the link.
     * @type {boolean}
     * @private
     */
    this.showRelNoFollow_ = false;
  
    /**
     * InputHandler object to listen for changes in the url input field.
     * @type {?goog.events.InputHandler}
     * @private
     */
    this.urlInputHandler_ = null;
  
    /**
     * InputHandler object to listen for changes in the email input field.
     * @type {?goog.events.InputHandler}
     * @private
     */
    this.emailInputHandler_ = null;
  
    /**
     * InputHandler object to listen for changes in the text to display input
     * field.
     * @type {?goog.events.InputHandler}
     * @private
     */
    this.textInputHandler_ = null;
  
    /**
     * The tab bar where the url and email tabs are.
     * @type {?goog.ui.editor.TabPane}
     * @private
     */
    this.tabPane_ = null;
  
    /**
     * The div element holding the link's display text input.
     * @type {?HTMLDivElement}
     * @private
     */
    this.textToDisplayDiv_ = null;
  
    /**
     * The input element holding the link's display text.
     * @type {?HTMLInputElement}
     * @private
     */
    this.textToDisplayInput_ = null;
  
    /**
     * Whether or not the feature of automatically generating the display text is
     * enabled.
     * @type {boolean}
     * @private
     */
    this.autogenFeatureEnabled_ = true;
  
    /**
     * Whether or not we should automatically generate the display text.
     * @type {boolean}
     * @private
     */
    this.autogenerateTextToDisplay_ = false;
  
    /**
     * Whether or not automatic generation of the display text is disabled.
     * @type {boolean}
     * @private
     */
    this.disableAutogen_ = false;
  
    /**
     * The input element (checkbox) to indicate that the link should open in a new
     * window.
     * @type {?HTMLInputElement}
     * @private
     */
    this.openInNewWindowCheckbox_ = null;
  
    /**
     * The input element (checkbox) to indicate that the link should have
     * 'rel=nofollow' attribute.
     * @type {?HTMLInputElement}
     * @private
     */
    this.relNoFollowCheckbox_ = null;
  
    /**
     * Whether to stop leaking the page's url via the referrer header when the
     * "test this link" link is clicked.
     * @private {boolean}
     */
    this.stopReferrerLeaks_ = false;
  
    /**
     * Whether to remove access to the current window object in the newly created
     * window when the "test this link" is clicked, since it can be used to launch
     * a reverse tabnabbing attack.
     * @private {boolean}
     */
    this.stopTabNabbing_ = false;
  };
  goog.inherits(goog.ui.editor.LinkDialog, goog.ui.editor.AbstractDialog);
  
  
  /**
   * Events specific to the link dialog.
   * @enum {string}
   */
  goog.ui.editor.LinkDialog.EventType = {
    BEFORE_TEST_LINK: 'beforetestlink'
  };
  
  
  
  /**
   * OK event object for the link dialog.
   * @param {string} linkText Text the user chose to display for the link.
   * @param {string} linkUrl Url the user chose for the link to point to.
   * @param {boolean} openInNewWindow Whether the link should open in a new window
   *     when clicked.
   * @param {boolean} noFollow Whether the link should have 'rel=nofollow'
   *     attribute.
   * @constructor
   * @extends {goog.events.Event}
   * @final
   */
  goog.ui.editor.LinkDialog.OkEvent = function(
      linkText, linkUrl, openInNewWindow, noFollow) {
    goog.ui.editor.LinkDialog.OkEvent.base(
        this, 'constructor', goog.ui.editor.AbstractDialog.EventType.OK);
  
    /**
     * The text of the link edited in the dialog.
     * @type {string}
     */
    this.linkText = linkText;
  
    /**
     * The url of the link edited in the dialog.
     * @type {string}
     */
    this.linkUrl = linkUrl;
  
    /**
     * Whether the link should open in a new window when clicked.
     * @type {boolean}
     */
    this.openInNewWindow = openInNewWindow;
  
    /**
     * Whether the link should have 'rel=nofollow' attribute.
     * @type {boolean}
     */
    this.noFollow = noFollow;
  };
  goog.inherits(goog.ui.editor.LinkDialog.OkEvent, goog.events.Event);
  
  
  
  /**
   * Event fired before testing a link by opening it in another window.
   * Calling preventDefault will stop the link from being opened.
   * @param {string} url Url of the link being tested.
   * @constructor
   * @extends {goog.events.Event}
   * @final
   */
  goog.ui.editor.LinkDialog.BeforeTestLinkEvent = function(url) {
    goog.ui.editor.LinkDialog.BeforeTestLinkEvent.base(
        this, 'constructor',
        goog.ui.editor.LinkDialog.EventType.BEFORE_TEST_LINK);
  
    /**
     * The url of the link being tested.
     * @type {string}
     */
    this.url = url;
  };
  goog.inherits(goog.ui.editor.LinkDialog.BeforeTestLinkEvent, goog.events.Event);
  
  
  /**
   * Sets the warning message to show to users about including email addresses on
   * public web pages.
   * @param {!goog.html.SafeHtml} emailWarning Warning message to show users about
   *     including email addresses on the web.
   */
  goog.ui.editor.LinkDialog.prototype.setEmailWarning = function(emailWarning) {
    this.emailWarning_ = emailWarning;
  };
  
  
  /**
   * Tells the dialog to show a checkbox where the user can choose to have the
   * link open in a new window.
   * @param {boolean} startChecked Whether to check the checkbox the first
   *     time the dialog is shown. Subesquent times the checkbox will remember its
   *     previous state.
   */
  goog.ui.editor.LinkDialog.prototype.showOpenLinkInNewWindow = function(
      startChecked) {
    this.showOpenLinkInNewWindow_ = true;
    this.isOpenLinkInNewWindowChecked_ = startChecked;
  };
  
  
  /**
   * Tells the dialog to focus the text to display input instead of the url field
   * if the text to display input is empty when the dialog is opened.
   */
  goog.ui.editor.LinkDialog.prototype.focusTextToDisplayOnOpenIfEmpty =
      function() {
    this.focusTextToDisplayOnOpenIfEmpty_ = true;
  };
  
  
  /**
   * Tells the dialog to show a checkbox where the user can choose to add
   * 'rel=nofollow' attribute to the link.
   */
  goog.ui.editor.LinkDialog.prototype.showRelNoFollow = function() {
    this.showRelNoFollow_ = true;
  };
  
  
  /** @override */
  goog.ui.editor.LinkDialog.prototype.show = function() {
    goog.ui.editor.LinkDialog.base(this, 'show');
  
  
    this.selectAppropriateTab_(
        this.textToDisplayInput_.value, this.getTargetUrl_());
  
    if (this.focusTextToDisplayOnOpenIfEmpty_ &&
        !this.targetLink_.getCurrentText()) {
      goog.editor.focus.focusInputField(this.textToDisplayInput_);
    }
  
    this.syncOkButton_();
  
    if (this.showOpenLinkInNewWindow_) {
      if (!this.targetLink_.isNew()) {
        // If link is not new, checkbox should reflect current target.
        this.isOpenLinkInNewWindowChecked_ =
            this.targetLink_.getAnchor().target == '_blank';
      }
      this.openInNewWindowCheckbox_.checked = this.isOpenLinkInNewWindowChecked_;
    }
  
    if (this.showRelNoFollow_) {
      this.relNoFollowCheckbox_.checked =
          goog.ui.editor.LinkDialog.hasNoFollow(this.targetLink_.getAnchor().rel);
    }
  };
  
  
  /** @override */
  goog.ui.editor.LinkDialog.prototype.hide = function() {
    this.disableAutogenFlag_(false);
    goog.ui.editor.LinkDialog.base(this, 'hide');
  };
  
  
  /**
   * Tells the dialog whether to show the 'text to display' div.
   * When the target element of the dialog is an image, there is no link text
   * to modify. This function can be used for this kind of situations.
   * @param {boolean} visible Whether to make 'text to display' div visible.
   */
  goog.ui.editor.LinkDialog.prototype.setTextToDisplayVisible = function(
      visible) {
    if (this.textToDisplayDiv_) {
      goog.style.setStyle(
          this.textToDisplayDiv_, 'display', visible ? 'block' : 'none');
    }
  };
  
  
  /**
   * Tells the plugin whether to stop leaking the page's url via the referrer
   * header when the "test this link" link is clicked.
   * @param {boolean} stop Whether to stop leaking the referrer.
   */
  goog.ui.editor.LinkDialog.prototype.setStopReferrerLeaks = function(stop) {
    this.stopReferrerLeaks_ = stop;
  };
  
  
  /**
   * Tells the plugin whether to remove access to the current window object in the
   * newly created window when the "test this link" is clicked, since it can be
   * used to launch a reverse tabnabbing attack.
   * @param {boolean} stop Whether to remove the reference to the current window
   *     in the new window.
   */
  goog.ui.editor.LinkDialog.prototype.setStopTabNabbing = function(stop) {
    this.stopTabNabbing_ = stop;
  };
  
  
  /**
   * Tells the dialog whether the autogeneration of text to display is to be
   * enabled.
   * @param {boolean} enable Whether to enable the feature.
   */
  goog.ui.editor.LinkDialog.prototype.setAutogenFeatureEnabled = function(
      enable) {
    this.autogenFeatureEnabled_ = enable;
  };
  
  
  /**
   * Checks if `str` contains {@code "nofollow"} as a separate word.
   * @param {string} str String to be tested.  This is usually `rel`
   *     attribute of an `HTMLAnchorElement` object.
   * @return {boolean} `true` if `str` contains `nofollow`.
   */
  goog.ui.editor.LinkDialog.hasNoFollow = function(str) {
    return goog.ui.editor.LinkDialog.NO_FOLLOW_REGEX_.test(str);
  };
  
  
  /**
   * Removes {@code "nofollow"} from `rel` if it's present as a separate
   * word.
   * @param {string} rel Input string.  This is usually `rel` attribute of
   *     an `HTMLAnchorElement` object.
   * @return {string} `rel` with any {@code "nofollow"} removed.
   */
  goog.ui.editor.LinkDialog.removeNoFollow = function(rel) {
    return rel.replace(goog.ui.editor.LinkDialog.NO_FOLLOW_REGEX_, '');
  };
  
  
  // *** Protected interface ************************************************** //
  
  
  /** @override */
  goog.ui.editor.LinkDialog.prototype.createDialogControl = function() {
    var builder = new goog.ui.editor.AbstractDialog.Builder(this);
    builder.setTitle(goog.ui.editor.messages.MSG_EDIT_LINK)
        .setContent(this.createDialogContent_());
    return builder.build();
  };
  
  
  /**
   * Creates and returns the event object to be used when dispatching the OK
   * event to listeners based on which tab is currently selected and the contents
   * of the input fields of that tab.
   * @return {!goog.ui.editor.LinkDialog.OkEvent} The event object to be used when
   *     dispatching the OK event to listeners.
   * @protected
   * @override
   */
  goog.ui.editor.LinkDialog.prototype.createOkEvent = function() {
    if (this.tabPane_.getCurrentTabId() ==
        goog.ui.editor.LinkDialog.Id_.EMAIL_ADDRESS_TAB) {
      return this.createOkEventFromEmailTab_();
    } else {
      return this.createOkEventFromWebTab_();
    }
  };
  
  
  // *** Private implementation *********************************************** //
  
  
  /**
   * Regular expression that matches `nofollow` value in an
   * {@code * HTMLAnchorElement}'s `rel` element.
   * @type {RegExp}
   * @private
   */
  goog.ui.editor.LinkDialog.NO_FOLLOW_REGEX_ = /\bnofollow\b/i;
  
  
  /**
   * Creates contents of this dialog.
   * @return {!Element} Contents of the dialog as a DOM element.
   * @private
   */
  goog.ui.editor.LinkDialog.prototype.createDialogContent_ = function() {
    this.textToDisplayDiv_ =
        /** @type {!HTMLDivElement} */ (this.buildTextToDisplayDiv_());
    var content =
        this.dom.createDom(goog.dom.TagName.DIV, null, this.textToDisplayDiv_);
  
    this.tabPane_ =
        new goog.ui.editor.TabPane(this.dom, goog.ui.editor.messages.MSG_LINK_TO);
    this.registerDisposable(this.tabPane_);
    this.tabPane_.addTab(
        goog.ui.editor.LinkDialog.Id_.ON_WEB_TAB,
        goog.ui.editor.messages.MSG_ON_THE_WEB,
        goog.ui.editor.messages.MSG_ON_THE_WEB_TIP,
        goog.ui.editor.LinkDialog.BUTTON_GROUP_, this.buildTabOnTheWeb_());
    this.tabPane_.addTab(
        goog.ui.editor.LinkDialog.Id_.EMAIL_ADDRESS_TAB,
        goog.ui.editor.messages.MSG_EMAIL_ADDRESS,
        goog.ui.editor.messages.MSG_EMAIL_ADDRESS_TIP,
        goog.ui.editor.LinkDialog.BUTTON_GROUP_, this.buildTabEmailAddress_());
    this.tabPane_.render(content);
  
    this.eventHandler_.listen(
        this.tabPane_, goog.ui.Component.EventType.SELECT, this.onChangeTab_);
  
    if (this.showOpenLinkInNewWindow_) {
      content.appendChild(this.buildOpenInNewWindowDiv_());
    }
    if (this.showRelNoFollow_) {
      content.appendChild(this.buildRelNoFollowDiv_());
    }
  
    return content;
  };
  
  
  /**
   * Builds and returns the text to display section of the edit link dialog.
   * @return {!Element} A div element to be appended into the dialog div.
   * @private
   * @suppress {strictMissingProperties} Part of the go/strict_warnings_migration
   */
  goog.ui.editor.LinkDialog.prototype.buildTextToDisplayDiv_ = function() {
    var table = this.dom.createTable(1, 2);
    table.cellSpacing = '0';
    table.cellPadding = '0';
    table.style.fontSize = '10pt';
    // Build the text to display input.
    var textToDisplayDiv = this.dom.createDom(goog.dom.TagName.DIV);
    var html = goog.html.SafeHtml.create(
        'span', {
          'style': {
            'position': 'relative',
            'bottom': '2px',
            'padding-right': '1px',
            'white-space': 'nowrap'
          },
          id: goog.ui.editor.LinkDialog.Id_.TEXT_TO_DISPLAY_LABEL
        },
        [goog.ui.editor.messages.MSG_TEXT_TO_DISPLAY, goog.string.Unicode.NBSP]);
    goog.dom.safe.setInnerHtml(table.rows[0].cells[0], html);
    this.textToDisplayInput_ = this.dom.createDom(
        goog.dom.TagName.INPUT,
        {id: goog.ui.editor.LinkDialog.Id_.TEXT_TO_DISPLAY});
    var textInput = this.textToDisplayInput_;
    // 98% prevents scroll bars in standards mode.
    // TODO(user): Is this necessary for quirks mode?
    goog.style.setStyle(textInput, 'width', '98%');
    goog.style.setStyle(table.rows[0].cells[1], 'width', '100%');
    goog.dom.appendChild(table.rows[0].cells[1], textInput);
  
    goog.a11y.aria.setState(
        /** @type {!Element} */ (textInput), goog.a11y.aria.State.LABELLEDBY,
        goog.ui.editor.LinkDialog.Id_.TEXT_TO_DISPLAY_LABEL);
    textInput.value = this.targetLink_.getCurrentText();
  
    this.textInputHandler_ = new goog.events.InputHandler(textInput);
    this.registerDisposable(this.textInputHandler_);
    this.eventHandler_.listen(
        this.textInputHandler_, goog.events.InputHandler.EventType.INPUT,
        this.onTextToDisplayEdit_);
  
    goog.dom.appendChild(textToDisplayDiv, table);
    return textToDisplayDiv;
  };
  
  
  /**
   * Builds and returns the "checkbox to open the link in a new window" section of
   * the edit link dialog.
   * @return {!Element} A div element to be appended into the dialog div.
   * @private
   */
  goog.ui.editor.LinkDialog.prototype.buildOpenInNewWindowDiv_ = function() {
    this.openInNewWindowCheckbox_ = this.dom.createDom(
        goog.dom.TagName.INPUT, {'type': goog.dom.InputType.CHECKBOX});
    return this.dom.createDom(
        goog.dom.TagName.DIV, null,
        this.dom.createDom(
            goog.dom.TagName.LABEL, null, this.openInNewWindowCheckbox_,
            goog.ui.editor.messages.MSG_OPEN_IN_NEW_WINDOW));
  };
  
  
  /**
   * Creates a DIV with a checkbox for {@code rel=nofollow} option.
   * @return {!Element} Newly created DIV element.
   * @private
   */
  goog.ui.editor.LinkDialog.prototype.buildRelNoFollowDiv_ = function() {
    var formatter = new goog.html.SafeHtmlFormatter();
    /** @desc Checkbox text for adding 'rel=nofollow' attribute to a link. */
    var MSG_ADD_REL_NOFOLLOW_ATTR = goog.getMsg(
        "Add '{$relNoFollow}' attribute ({$linkStart}Learn more{$linkEnd})", {
          'relNoFollow': 'rel=nofollow',
          'linkStart': formatter.startTag('a', {
            'href': 'http://support.google.com/webmasters/bin/' +
                'answer.py?hl=en&answer=96569',
            'target': '_blank'
          }),
          'linkEnd': formatter.endTag('a')
        });
  
    this.relNoFollowCheckbox_ = this.dom.createDom(
        goog.dom.TagName.INPUT, {'type': goog.dom.InputType.CHECKBOX});
    return this.dom.createDom(
        goog.dom.TagName.DIV, null,
        this.dom.createDom(
            goog.dom.TagName.LABEL, null, this.relNoFollowCheckbox_,
            goog.dom.safeHtmlToNode(
                formatter.format(MSG_ADD_REL_NOFOLLOW_ATTR))));
  };
  
  
  /**
  * Builds and returns the div containing the tab "On the web".
  * @return {!Element} The div element containing the tab.
  * @private
  */
  goog.ui.editor.LinkDialog.prototype.buildTabOnTheWeb_ = function() {
    var onTheWebDiv = this.dom.createElement(goog.dom.TagName.DIV);
  
    var headingDiv = this.dom.createDom(
        goog.dom.TagName.DIV, {},
        this.dom.createDom(
            goog.dom.TagName.B, {}, goog.ui.editor.messages.MSG_WHAT_URL));
    var urlInput = this.dom.createDom(goog.dom.TagName.INPUT, {
      id: goog.ui.editor.LinkDialog.Id_.ON_WEB_INPUT,
      className: goog.ui.editor.LinkDialog.TARGET_INPUT_CLASSNAME_
    });
    goog.a11y.aria.setState(
        urlInput, goog.a11y.aria.State.LABELLEDBY,
        goog.ui.editor.LinkDialog.Id_.ON_WEB_TAB);
    // IE throws on unknown values for type, but IE10+ supports type=url
    if (!goog.userAgent.IE || goog.userAgent.isVersionOrHigher('10')) {
      // On browsers that support Web Forms 2.0, allow autocompletion of URLs.
      urlInput.type = goog.dom.InputType.URL;
    }
  
    if (goog.editor.BrowserFeature.NEEDS_99_WIDTH_IN_STANDARDS_MODE &&
        goog.editor.node.isStandardsMode(urlInput)) {
      urlInput.style.width = '99%';
    }
  
    var inputDiv = this.dom.createDom(goog.dom.TagName.DIV, null, urlInput);
  
    this.urlInputHandler_ = new goog.events.InputHandler(urlInput);
    this.registerDisposable(this.urlInputHandler_);
    this.eventHandler_.listen(
        this.urlInputHandler_, goog.events.InputHandler.EventType.INPUT,
        this.onUrlOrEmailInputChange_);
  
    var testLink = new goog.ui.Button(
        goog.ui.editor.messages.MSG_TEST_THIS_LINK,
        goog.ui.LinkButtonRenderer.getInstance(), this.dom);
    testLink.render(inputDiv);
    testLink.getElement().style.marginTop = '1em';
    this.eventHandler_.listen(
        testLink, goog.ui.Component.EventType.ACTION, this.onWebTestLink_);
  
    // Build the "On the web" explanation text div.
    var explanationDiv = this.dom.createDom(
        goog.dom.TagName.DIV,
        goog.ui.editor.LinkDialog.EXPLANATION_TEXT_CLASSNAME_);
    goog.dom.safe.setInnerHtml(
        explanationDiv, goog.ui.editor.messages.getTrLinkExplanationSafeHtml());
    onTheWebDiv.appendChild(headingDiv);
    onTheWebDiv.appendChild(inputDiv);
    onTheWebDiv.appendChild(explanationDiv);
  
    return onTheWebDiv;
  };
  
  
  /**
   * Builds and returns the div containing the tab "Email address".
   * @return {!Element} the div element containing the tab.
   * @private
   */
  goog.ui.editor.LinkDialog.prototype.buildTabEmailAddress_ = function() {
    var emailTab = this.dom.createDom(goog.dom.TagName.DIV);
  
    var headingDiv = this.dom.createDom(
        goog.dom.TagName.DIV, {},
        this.dom.createDom(
            goog.dom.TagName.B, {}, goog.ui.editor.messages.MSG_WHAT_EMAIL));
    goog.dom.appendChild(emailTab, headingDiv);
    var emailInput = this.dom.createDom(goog.dom.TagName.INPUT, {
      id: goog.ui.editor.LinkDialog.Id_.EMAIL_ADDRESS_INPUT,
      className: goog.ui.editor.LinkDialog.TARGET_INPUT_CLASSNAME_
    });
    goog.a11y.aria.setState(
        emailInput, goog.a11y.aria.State.LABELLEDBY,
        goog.ui.editor.LinkDialog.Id_.EMAIL_ADDRESS_TAB);
  
    if (goog.editor.BrowserFeature.NEEDS_99_WIDTH_IN_STANDARDS_MODE &&
        goog.editor.node.isStandardsMode(emailInput)) {
      // Standards mode sizes this too large.
      emailInput.style.width = '99%';
    }
  
    goog.dom.appendChild(emailTab, emailInput);
  
    this.emailInputHandler_ = new goog.events.InputHandler(emailInput);
    this.registerDisposable(this.emailInputHandler_);
    this.eventHandler_.listen(
        this.emailInputHandler_, goog.events.InputHandler.EventType.INPUT,
        this.onUrlOrEmailInputChange_);
  
    goog.dom.appendChild(
        emailTab,
        this.dom.createDom(
            goog.dom.TagName.DIV, {
              id: goog.ui.editor.LinkDialog.Id_.EMAIL_WARNING,
              className: goog.ui.editor.LinkDialog.EMAIL_WARNING_CLASSNAME_,
              style: 'visibility:hidden'
            },
            goog.ui.editor.messages.MSG_INVALID_EMAIL));
  
    if (this.emailWarning_) {
      var explanationDiv = this.dom.createDom(
          goog.dom.TagName.DIV,
          goog.ui.editor.LinkDialog.EXPLANATION_TEXT_CLASSNAME_);
      goog.dom.safe.setInnerHtml(explanationDiv, this.emailWarning_);
      goog.dom.appendChild(emailTab, explanationDiv);
    }
    return emailTab;
  };
  
  
  /**
   * Returns the url that the target points to.
   * @return {string} The url that the target points to.
   * @private
   */
  goog.ui.editor.LinkDialog.prototype.getTargetUrl_ = function() {
    // Get the href-attribute through getAttribute() rather than the href property
    // because Google-Toolbar on Firefox with "Send with Gmail" turned on
    // modifies the href-property of 'mailto:' links but leaves the attribute
    // untouched.
    return this.targetLink_.getAnchor().getAttribute('href') || '';
  };
  
  
  /**
   * Selects the correct tab based on the URL, and fills in its inputs.
   * For new links, it suggests a url based on the link text.
   * @param {string} text The inner text of the link.
   * @param {string} url The href for the link.
   * @private
   * @suppress {strictMissingProperties} Part of the go/strict_warnings_migration
   */
  goog.ui.editor.LinkDialog.prototype.selectAppropriateTab_ = function(
      text, url) {
    if (this.isNewLink_()) {
      // Newly created non-empty link: try to infer URL from the link text.
      this.guessUrlAndSelectTab_(text);
    } else if (goog.editor.Link.isMailto(url)) {
      // The link is for an email.
      this.tabPane_.setSelectedTabId(
          goog.ui.editor.LinkDialog.Id_.EMAIL_ADDRESS_TAB);
      this.dom.getElement(goog.ui.editor.LinkDialog.Id_.EMAIL_ADDRESS_INPUT)
          .value = url.substring(url.indexOf(':') + 1);
      this.setAutogenFlagFromCurInput_();
    } else {
      // No specific tab was appropriate, default to on the web tab.
      this.tabPane_.setSelectedTabId(goog.ui.editor.LinkDialog.Id_.ON_WEB_TAB);
      this.dom.getElement(goog.ui.editor.LinkDialog.Id_.ON_WEB_INPUT).value =
          this.isNewLink_() ? 'http://' : url;
      this.setAutogenFlagFromCurInput_();
    }
  };
  
  
  /**
   * Select a url/tab based on the link's text. This function is simply
   * the isNewLink_() == true case of selectAppropriateTab_().
   * @param {string} text The inner text of the link.
   * @private
   * @suppress {strictMissingProperties} Part of the go/strict_warnings_migration
   */
  goog.ui.editor.LinkDialog.prototype.guessUrlAndSelectTab_ = function(text) {
    if (goog.editor.Link.isLikelyEmailAddress(text)) {
      // The text is for an email address.
      this.tabPane_.setSelectedTabId(
          goog.ui.editor.LinkDialog.Id_.EMAIL_ADDRESS_TAB);
      this.dom.getElement(goog.ui.editor.LinkDialog.Id_.EMAIL_ADDRESS_INPUT)
          .value = text;
      this.setAutogenFlag_(true);
      // TODO(user): Why disable right after enabling? What bug are we
      // working around?
      this.disableAutogenFlag_(true);
    } else if (goog.editor.Link.isLikelyUrl(text)) {
      // The text is for a web URL.
      this.tabPane_.setSelectedTabId(goog.ui.editor.LinkDialog.Id_.ON_WEB_TAB);
      this.dom.getElement(goog.ui.editor.LinkDialog.Id_.ON_WEB_INPUT).value =
          text;
      this.setAutogenFlag_(true);
      this.disableAutogenFlag_(true);
    } else {
      // No meaning could be deduced from text, choose a default tab.
      if (!this.targetLink_.getCurrentText()) {
        this.setAutogenFlag_(true);
      }
      this.tabPane_.setSelectedTabId(goog.ui.editor.LinkDialog.Id_.ON_WEB_TAB);
    }
  };
  
  
  /**
   * Called on a change to the url or email input. If either one of those tabs
   * is active, sets the OK button to enabled/disabled accordingly.
   * @private
   * @suppress {strictMissingProperties} Part of the go/strict_warnings_migration
   */
  goog.ui.editor.LinkDialog.prototype.syncOkButton_ = function() {
    var inputValue;
    if (this.tabPane_.getCurrentTabId() ==
        goog.ui.editor.LinkDialog.Id_.EMAIL_ADDRESS_TAB) {
      inputValue =
          this.dom.getElement(goog.ui.editor.LinkDialog.Id_.EMAIL_ADDRESS_INPUT)
              .value;
      this.toggleInvalidEmailWarning_(
          inputValue != '' && !goog.editor.Link.isLikelyEmailAddress(inputValue));
    } else if (
        this.tabPane_.getCurrentTabId() ==
        goog.ui.editor.LinkDialog.Id_.ON_WEB_TAB) {
      inputValue =
          this.dom.getElement(goog.ui.editor.LinkDialog.Id_.ON_WEB_INPUT).value;
    } else {
      return;
    }
    this.getOkButtonElement().disabled =
        goog.string.isEmptyOrWhitespace(inputValue);
  };
  
  
  /**
   * Show/hide the Invalid Email Address warning.
   * @param {boolean} on Whether to show the warning.
   * @private
   */
  goog.ui.editor.LinkDialog.prototype.toggleInvalidEmailWarning_ = function(on) {
    this.dom.getElement(goog.ui.editor.LinkDialog.Id_.EMAIL_WARNING)
        .style.visibility = (on ? 'visible' : 'hidden');
  };
  
  
  /**
   * Changes the autogenerateTextToDisplay flag so that text to
   * display stops autogenerating.
   * @private
   */
  goog.ui.editor.LinkDialog.prototype.onTextToDisplayEdit_ = function() {
    var inputEmpty = this.textToDisplayInput_.value == '';
    if (inputEmpty) {
      this.setAutogenFlag_(true);
    } else {
      this.setAutogenFlagFromCurInput_();
    }
  };
  
  
  /**
   * The function called when hitting OK with the "On the web" tab current.
   * @return {!goog.ui.editor.LinkDialog.OkEvent} The event object to be used when
   *     dispatching the OK event to listeners.
   * @private
   */
  goog.ui.editor.LinkDialog.prototype.createOkEventFromWebTab_ = function() {
    var input = /** @type {HTMLInputElement} */ (
        this.dom.getElement(goog.ui.editor.LinkDialog.Id_.ON_WEB_INPUT));
    var linkURL = input.value;
    if (goog.editor.Link.isLikelyEmailAddress(linkURL)) {
      // Make sure that if user types in an e-mail address, it becomes "mailto:".
      return this.createOkEventFromEmailTab_(
          goog.ui.editor.LinkDialog.Id_.ON_WEB_INPUT);
    } else {
      if (linkURL.search(/:/) < 0) {
        linkURL = 'http://' + goog.string.trimLeft(linkURL);
      }
      return this.createOkEventFromUrl_(linkURL);
    }
  };
  
  
  /**
   * The function called when hitting OK with the "email address" tab current.
   * @param {string=} opt_inputId Id of an alternate input to check.
   * @return {!goog.ui.editor.LinkDialog.OkEvent} The event object to be used when
   *     dispatching the OK event to listeners.
   * @private
   * @suppress {strictMissingProperties} Part of the go/strict_warnings_migration
   */
  goog.ui.editor.LinkDialog.prototype.createOkEventFromEmailTab_ = function(
      opt_inputId) {
    var linkURL =
        this.dom
            .getElement(
                opt_inputId || goog.ui.editor.LinkDialog.Id_.EMAIL_ADDRESS_INPUT)
            .value;
    linkURL = 'mailto:' + linkURL;
    return this.createOkEventFromUrl_(linkURL);
  };
  
  
  /**
   * Function to test a link from the on the web tab.
   * @private
   */
  goog.ui.editor.LinkDialog.prototype.onWebTestLink_ = function() {
    var input = /** @type {HTMLInputElement} */ (
        this.dom.getElement(goog.ui.editor.LinkDialog.Id_.ON_WEB_INPUT));
    var url = input.value;
    if (url.search(/:/) < 0) {
      url = 'http://' + goog.string.trimLeft(url);
    }
    if (this.dispatchEvent(
            new goog.ui.editor.LinkDialog.BeforeTestLinkEvent(url))) {
      var win = this.dom.getWindow();
      var size = goog.dom.getViewportSize(win);
      var openOptions = {
        target: '_blank',
        width: Math.max(size.width - 50, 50),
        height: Math.max(size.height - 50, 50),
        toolbar: true,
        scrollbars: true,
        location: true,
        statusbar: false,
        menubar: true,
        resizable: true,
        noreferrer: this.stopReferrerLeaks_,
        noopener: this.stopTabNabbing_
      };
      goog.window.open(url, openOptions, win);
    }
  };
  
  
  /**
   * Called whenever the url or email input is edited. If the text to display
   * matches the text to display, turn on auto. Otherwise if auto is on, update
   * the text to display based on the url.
   * @private
   */
  goog.ui.editor.LinkDialog.prototype.onUrlOrEmailInputChange_ = function() {
    if (this.autogenerateTextToDisplay_) {
      this.setTextToDisplayFromAuto_();
    } else if (this.textToDisplayInput_.value == '') {
      this.setAutogenFlagFromCurInput_();
    }
    this.syncOkButton_();
  };
  
  
  /**
   * Called when the currently selected tab changes.
   * @param {goog.events.Event} e The tab change event.
   * @private
   */
  goog.ui.editor.LinkDialog.prototype.onChangeTab_ = function(e) {
    var tab = /** @type {goog.ui.Tab} */ (e.target);
  
    // Focus on the input field in the selected tab.
    var input = /** @type {!HTMLElement} */ (
        this.dom.getElement(
            tab.getId() + goog.ui.editor.LinkDialog.Id_.TAB_INPUT_SUFFIX));
    goog.editor.focus.focusInputField(input);
  
    // For some reason, IE does not fire onpropertychange events when the width
    // is specified as a percentage, which breaks the InputHandlers.
    input.style.width = '';
    input.style.width = input.offsetWidth + 'px';
  
    this.syncOkButton_();
    this.setTextToDisplayFromAuto_();
  };
  
  
  /**
   * If autogen is turned on, set the value of text to display based on the
   * current selection or url.
   * @private
   */
  goog.ui.editor.LinkDialog.prototype.setTextToDisplayFromAuto_ = function() {
    if (this.autogenFeatureEnabled_ && this.autogenerateTextToDisplay_) {
      var inputId = this.tabPane_.getCurrentTabId() +
          goog.ui.editor.LinkDialog.Id_.TAB_INPUT_SUFFIX;
      this.textToDisplayInput_.value =
          /** @type {HTMLInputElement} */ (this.dom.getElement(inputId)).value;
    }
  };
  
  
  /**
   * Turn on the autogenerate text to display flag, and set some sort of indicator
   * that autogen is on.
   * @param {boolean} val Boolean value to set autogenerate to.
   * @private
   */
  goog.ui.editor.LinkDialog.prototype.setAutogenFlag_ = function(val) {
    // TODO(user): This whole autogen thing is very confusing. It needs
    // to be refactored and/or explained.
    this.autogenerateTextToDisplay_ = val;
  };
  
  
  /**
   * Disables autogen so that onUrlOrEmailInputChange_ doesn't act in cases
   * that are undesirable.
   * @param {boolean} autogen Boolean value to set disableAutogen to.
   * @private
   */
  goog.ui.editor.LinkDialog.prototype.disableAutogenFlag_ = function(autogen) {
    this.setAutogenFlag_(!autogen);
    this.disableAutogen_ = autogen;
  };
  
  
  /**
   * Creates an OK event from the text to display input and the specified link.
   * If text to display input is empty, then generate the auto value for it.
   * @return {!goog.ui.editor.LinkDialog.OkEvent} The event object to be used when
   *     dispatching the OK event to listeners.
   * @param {string} url Url the target element should point to.
   * @private
   */
  goog.ui.editor.LinkDialog.prototype.createOkEventFromUrl_ = function(url) {
    // Fill in the text to display input in case it is empty.
    this.setTextToDisplayFromAuto_();
    if (this.showOpenLinkInNewWindow_) {
      // Save checkbox state for next time.
      this.isOpenLinkInNewWindowChecked_ = this.openInNewWindowCheckbox_.checked;
    }
    return new goog.ui.editor.LinkDialog.OkEvent(
        this.textToDisplayInput_.value, url,
        this.showOpenLinkInNewWindow_ && this.isOpenLinkInNewWindowChecked_,
        this.showRelNoFollow_ && this.relNoFollowCheckbox_.checked);
  };
  
  
  /**
   * If an email or url is being edited, set autogenerate to on if the text to
   * display matches the url.
   * @private
   * @suppress {strictMissingProperties} Part of the go/strict_warnings_migration
   */
  goog.ui.editor.LinkDialog.prototype.setAutogenFlagFromCurInput_ = function() {
    var autogen = false;
    if (!this.disableAutogen_) {
      var tabInput = this.dom.getElement(
          this.tabPane_.getCurrentTabId() +
          goog.ui.editor.LinkDialog.Id_.TAB_INPUT_SUFFIX);
      autogen = (tabInput.value == this.textToDisplayInput_.value);
    }
    this.setAutogenFlag_(autogen);
  };
  
  
  /**
   * @return {boolean} Whether the link is new.
   * @private
   */
  goog.ui.editor.LinkDialog.prototype.isNewLink_ = function() {
    return this.targetLink_.isNew();
  };
  
  
  /**
   * IDs for relevant DOM elements.
   * @enum {string}
   * @private
   */
  goog.ui.editor.LinkDialog.Id_ = {
    TEXT_TO_DISPLAY: 'linkdialog-text',
    TEXT_TO_DISPLAY_LABEL: 'linkdialog-text-label',
    ON_WEB_TAB: 'linkdialog-onweb',
    ON_WEB_INPUT: 'linkdialog-onweb-tab-input',
    EMAIL_ADDRESS_TAB: 'linkdialog-email',
    EMAIL_ADDRESS_INPUT: 'linkdialog-email-tab-input',
    EMAIL_WARNING: 'linkdialog-email-warning',
    TAB_INPUT_SUFFIX: '-tab-input'
  };
  
  
  /**
   * Base name for the radio buttons group.
   * @type {string}
   * @private
   */
  goog.ui.editor.LinkDialog.BUTTON_GROUP_ = 'linkdialog-buttons';
  
  
  /**
   * Class name for the url and email input elements.
   * @type {string}
   * @private
   */
  goog.ui.editor.LinkDialog.TARGET_INPUT_CLASSNAME_ =
      goog.getCssName('tr-link-dialog-target-input');
  
  
  /**
   * Class name for the email address warning element.
   * @type {string}
   * @private
   */
  goog.ui.editor.LinkDialog.EMAIL_WARNING_CLASSNAME_ =
      goog.getCssName('tr-link-dialog-email-warning');
  
  
  /**
   * Class name for the explanation text elements.
   * @type {string}
   * @private
   */
  goog.ui.editor.LinkDialog.EXPLANATION_TEXT_CLASSNAME_ =
      goog.getCssName('tr-link-dialog-explanation-text');
  