sharepoint 2013 添加ribbon并单选可用

如果仅仅是添加一个Ribbon菜单的话，那么网上一搜一大把。比如霖雨童鞋的博客http://www.cnblogs.com/jianyus/archive/2013/05/04/3059022.html

但是很多情况是需要控制这个菜单是否可用的。比如我单选的时候才可用，不选或者多选的时候，不可用，这个很少有说的。还是自己来吧。

假设大家都已经参照霖雨童鞋的博客完成了如下代码

<?xml version="1.0" encoding="utf-8"?>

<Elements xmlns="http://schemas.microsoft.com/sharepoint/">

<CustomAction Id="Ribbon.CustomGroup" RegistrationId="101" RegistrationType="List" Title="MyCustomerRibbon" Location="CommandUI.Ribbon">

<CommandUIExtension>

<CommandUIDefinitions>

<CommandUIDefinition Location="Ribbon.Documents.New.Controls._children">

<Button Id="Ribbon.Documents.New.Baidu"

Command="Baidu"

Image32by32="/_layouts/images/test/du.png"

LabelText="百度首页"

TemplateAlias="o1" />

</CommandUIDefinition>

</CommandUIDefinitions>

<CommandUIHandlers>

<CommandUIHandler

Command="Baidu"

CommandAction="javascript:window.open ('http://www.baidu.com') ;" />

</CommandUIHandlers>

</CommandUIExtension>

</CustomAction>

</Elements>

这里，我们要在<CommandUIHandler Command="Baidu" CommandAction="javascript:window.open ('http://www.baidu.com') ;" />

</CommandUIHandlers>这个节点加一个EnabledScript属性，并且写一些脚本。完善之后的脚本是这个样子的

<?xml version="1.0" encoding="utf-8"?>

<Elements xmlns="http://schemas.microsoft.com/sharepoint/">

<CustomAction Id="Ribbon.CustomGroup" RegistrationId="101" RegistrationType="List" Title="MyCustomerRibbon" Location="CommandUI.Ribbon">

<CommandUIExtension>

<CommandUIDefinitions>

<CommandUIDefinition Location="Ribbon.Documents.New.Controls._children">

<Button Id="Ribbon.Documents.New.Baidu"

Command="Baidu"

Image32by32="/_layouts/images/test/du.png"

LabelText="百度首页"

TemplateAlias="o1" />

</CommandUIDefinition>

</CommandUIDefinitions>

<CommandUIHandlers>

<CommandUIHandler

Command="Baidu"

CommandAction="javascript:window.open ('http://www.baidu.com') ;"

 EnabledScript="javascript:      
            function EnableDisableButton() {
                var enabled = false; 
                var selectedItems = SP.ListOperation.Selection.getSelectedItems();

                if (CountDictionary(selectedItems) == 1) {
                    if (this.itemId != selectedItems[0]['id']) {
                        this.itemId = selectedItems[0]['id'];
                        GetItemStatus(this.itemId);
                    }                                      
                    else if (this.StatusValue == false) {  
                        enabled = false;
                    }  
                    else if ((this.StatusValue == true) &amp;&amp; (this.itemId == selectedItems[0]['id'])) {
                        enabled = true;
                    }
                }
                else { 
                    enabled = false;
                }

                return enabled;
            }

            function GetItemStatus(itemId) {
                var _clientContext = SP.ClientContext.get_current();
                var _web = _clientContext.get_web();
                var _currentList = _web.get_lists().getById(SP.ListOperation.Selection.getSelectedList());              
                this.singleItem = _currentList.getItemById(itemId);
                _clientContext.load(this.singleItem, 'ContentType');

                _clientContext.executeQueryAsync(Function.createDelegate(this, onQuerySucceeded), Function.createDelegate(this, onQueryFailed));
            }

            function onQuerySucceeded(sender, args) {
71                 this.StatusValue = true ; 
                
        RefreshCommandUI();                
        
        }

            function onQueryFailed(sender, args) {
                alert('Request Failed ' + args.get_message() + '
' + args.get_stackTrace());
            }

            EnableDisableButton();
             " />

</CommandUIHandlers>

</CommandUIExtension>

</CustomAction>

</Elements>

这个新添加的这段代码我是参照C:Program FilesCommon FilesMicrosoft SharedWeb Server Extensions15TEMPLATEFEATURESPPSRibbonelements.xml来的，做了一下修改。至于为什么要这么修改，我不想多说了，自己去研究吧，现在已经凌晨两点半，我想静静。