Sharepoint学习笔记—ECMAScript对象模型系列-- 12、通过邮件发送带有Unique DocumentID的文档链接

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　　在Sharepoint Document List默认的Ribbon中有这么一个发送Email的按钮，通过它可以把选中的文档分享给其它用户，如下图：

　　但在发送的邮件内，默认Email按钮采用的是发送文档的Url地址，而并没有用到Sharepoint提供的Unique Document ID，使用文档的URL分享文档最明显的坏处就是，一旦我们移动了这个文档，那么这个URL就失效了，曾经分享过这个文档的用户要想再通过这个URL链接来获取这个文档就不再会成功。所以在这里，我们就通过ECMAscript结合Ribbon的相关知识来实现通过Sharepoint2010提供的Unique Document ID把文档通过邮件分享给其它用户的目标。下面进入操作步骤。
　　1、新建一个空的Sharepoint项目

2、添加新的Feature，并命名为EmailLinkFeature，如下图

　　3、添加新的空Element，命名为EmailLinkElement

　　此Element的代码如下


<?xml version="1.0" encoding="utf-8"?>
<Elements xmlns="http://schemas.microsoft.com/sharepoint/">
    <CustomAction
     Id="Ribbon.EmailUniqueLink"
     Location="CommandUI.Ribbon"
     RegistrationId="101"
     RegistrationType="List">
        <CommandUIExtension>
            <CommandUIDefinitions>
                <CommandUIDefinition
                   Location="Ribbon.Documents.Share.Controls._children">
                    <Button
                       Id="Ribbon.Documents.Share.EmailUniqueLink"
                       Command="Ribbon.Documents.Share.EmailUniqueLink"
                       Sequence="15"
                       Image16by16="/_layouts/$Resources:core,Language;/images/formatmap16x16.png"
                       Image16by16Top="-16"
                       Image16by16Left="-88"
                       Image32by32="/_layouts/$Resources:core,Language;/images/formatmap32x32.png"
                       Image32by32Top="-128"
                       Image32by32Left="-448"
                       Description="Sends the unique link to the document by e-mail"
                       LabelText="E-mail Unique Link"
                       ToolTipTitle="E-mail Unique Link"
                       ToolTipDescription="Sends the unique link to the document by e-mail"
                       TemplateAlias="o1"/>
                </CommandUIDefinition>
            </CommandUIDefinitions>
            <CommandUIHandlers>
                <CommandUIHandler
                   Command="Ribbon.Documents.Share.EmailUniqueLink"
                   CommandAction="javascript:EmailUniqueLink();"
                   EnabledScript="javascript:EnableEmailUniqueLink();"/>
            </CommandUIHandlers>
        </CommandUIExtension>
    </CustomAction>
    <CustomAction
       Id="Ribbon.Documents.Share.EmailUniqueLink.Script"
       Location="ScriptLink"
       ScriptSrc ="/_layouts/EmailLinkButton/EmailLinkButton.js"/>
</Elements>　　
　　4、添加Sharepoint的Layouts目录，并在此目录下新添加一个Javascript文件:EmailLinkButton.js文件

　　EmailLinkButton.js的内容如下:


// This method will contain most of the code needed to request the unique url to the document
function EmailUniqueLink() {
    // First get the context and web
    var ctx = SP.ClientContext.get_current();
    this.web = ctx.get_web();
    // Get the current selected list, then load the list using the getById method of Web (SPWeb)
    var listId = SP.ListOperation.Selection.getSelectedList();
    var sdlist = this.web.get_lists().getById(listId);
    // Get the currently selected item of the list. This will return a dicustonary with an id field
    var items = SP.ListOperation.Selection.getSelectedItems(ctx);
    var mijnid = items[0];
    // Request the list item from the server using the getItemById method. This will load all properties.   
    // If needed, one could pre-request the fields to be loaded to preserve bandwidth.
    this.listItem = sdlist.getItemById(mijnid.id);
    // load the item in the context for batch operation.
    ctx.load(this.listItem);
    //Execute the actual script on the server side. Specify delegates to handle the response.
    ctx.executeQueryAsync(Function.createDelegate(this, this.onQuerySucceeded), Function.createDelegate(this, this.onQueryFailed));
}
// Delegate that is called when server operation is complete upon success.
function onQuerySucceeded(sender, args) {
    // Request url by using the get_item method. It will return the Url field type, which has a Url property.
    var url = this.listItem.get_item('_dlc_DocIdUrl').get_url();
    // Request the name of the document.
    var title = this.listItem.get_item('FileLeafRef');
    // Open a new e-mail in the default mail program.
    window.open('mailto:?subject=Emailing%3A%20' + title + '&body=' + url);
}
// Delegate that is called when server operation is completed with errors.
function onQueryFailed(sender, args) {
    alert('failed ' + args.toString());
}
// Method to enable/disable the e-mail unique button on the ribbon.
function EnableEmailUniqueLink() {
    // request number of selected items.
    var items = SP.ListOperation.Selection.getSelectedItems();
    var count = CountDictionary(items);
    // only return true is a single item is selected.
    return (count == 1);
}
　　5、Build并部署我们的项目。
6、测试项目如下