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Facebook provides several widgets for use on websitesWidgets are self-contained XFBML controls that utilize Facebook Connect Currently, Facebook has released two widgets for Connected sites: the Comments Box and the Live Stream Box Each widget is discussed in this section
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The Comments Box, as previously described in the section Facebook Connect Features, adds a box that enables users to enter comments about the content on a page Figure 1314 shows a Comments Box on an external site before a user logs in Users can either enter a comment by entering their name and email address or by logging in via Facebook Connect, either on the site itself or on the Comments Box
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A Comments Box offers two methods of logging in to enter a comment
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When a user enters her name and email address, Facebook considers any comments she enters as coming from an anonymous source Her name and email address are not passed to the hosting website; they are just used to display the user information next to the comment Figure 1315 shows the expanded entry fields that are displayed when a user begins to enter her informationA user also must pass a CAPTCHA to submit her comment; CAPTCHAs verify that a human is entering the form data rather than a computer (or bot) using text identification Underneath the form in Figure 1315 is a sample anonymous comment If a user chooses to use Facebook Connect to log in, the Comments Box changes to what s shown in Figure 1316The user has the option to also post her comments to her own Facebook profile Comments posted from Connected users display the user s picture shown at the bottom of Figure 1316 and, if she has the box checked, a Feed story similar to what is shown in Figure 1317 is posted to the Wall tab of her profile and her friends streams on their Home pages Each story contains a link back to the Connected site on which it was created
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13 Facebook Connect
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To enter an anonymous comment, a user has to fill out her information and pass a CAPTCHA
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Users who are logged in with Facebook Connect see this Comments Box
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A Feed story created by adding a comment to a Comments Box
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Next to the submitted comments shown in Figures 1316, there is a Delete linkThis is shown to users listed as Administrators or Moderators in the Developer Settings for the Connected siteAt the top of Figure 1316, also notice the Administer Comments link, which is only shown to Administrators Clicking this link displays the Widget Settings form shown in Figure 1318, which is almost identical to the Widgets tab in Developer Settings
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Figure 1318 Administrators can manage the Comments Box settings by clicking the Administer Comments link on the Comments Box
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To add a Comments Box to your site, use the <fb:comments> XFBML tagThis tag can take the optional attributes listed in Table 132
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Table 132 Tag
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<fb:comments > Attributes Type
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Description
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A unique identifier for these comments You need to specify your own, because the default is a URL-encoded version of the page URL, which can change if the parameters change You can use this ID later to programmatically retrieve the comments The maximum number of comments to display, defaulting to 10 The width of the Comments Box, defaulting to 550px
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numposts width
int string
13 Facebook Connect
Table 132 Tag
css title url simple reverse quiet
<fb:comments > Attributes Type
string string string bool bool bool
Description
A URL of a stylesheet to use for the Comment Box Restrictions on these styles are displayed next The text to display above the source URL in news stories, defaulting to the web page title The URL that is used in the news stories for the source and links, defaulting to the current page URL If true, disables the shaded box around the comment entry form, defaulting to false If true, shows the most recent comments at the bottom instead of at the top of the list, defaulting to false Prevents the Comments Box from sending notifications to previous commentors, defaulting to false
Listing 1312 shows how to incorporate a Comments Box into a siteWe pass set the attribute so that we can access these comments later