SharePoint【ECMAScript对象模型系列】-- 11. Enable/Disable Ribbon上的Button

这里我们想要达到的目标如下：
1、在Ribbon的Ribbon.Library.ViewFormat位置创建一个Button控件。
2、 根据当前登录用户是否在特定的Groups内来决定他是否有权使用(Enable)此Button。
3、 此Button的功能就是跳出一个简单的信息提示框。  

效果如下:

 

按钮工作效果如下

 

操作步骤如下:
1. 创建一个新的Project，为Farm Solution
2. 在此Project上添加一个新Feature.
3、在此Project上添加一个新的"Empty Element"
4、此Element定义代码如下:

<?xml version="1.0" encoding="utf-8"?>
<Elements xmlns="http://schemas.microsoft.com/sharepoint/">
    <CustomAction
       Id="ButtonForGroupUsersOnly"
       Location="CommandUI.Ribbon"
       RegistrationId="101"
       RegistrationType="List"
       Title="Owners Group Button">
        <CommandUIExtension>
            <CommandUIDefinitions>
                <CommandUIDefinition
                Location="Ribbon.Library.ViewFormat.Controls._children">
                    <Button Id="Ribbon.Library.ViewFormat.UsersBtn"
                    Command="usersBtnCommand"
                    LabelText="Group Users Button"
                    TemplateAlias="o1" />"
                </CommandUIDefinition>
            </CommandUIDefinitions>
            <CommandUIHandlers>
                <CommandUIHandler
                Command="usersBtnCommand"
                CommandAction="javascript:alert('Action from this button !');"
                EnabledScript="javascript:EnablerScript(4,5);"/>
            </CommandUIHandlers>
        </CommandUIExtension>
    </CustomAction>
    <CustomAction
         Id="Ribbon.Library.ViewFormat.Scripts"
         Location="ScriptLink"
         ScriptSrc ="/_layouts/SPRiboonTest/CheckUserInGroup.js"/>

</Elements>

5、添加一个Javascrip文件CheckUserInGroup.js，内容如下:

///<reference name="MicrosoftAjax.js" /> 
///<reference path="file://C:/Program Files/Common Files/Microsoft Shared/Web Server Extensions/14/TEMPLATE/LAYOUTS/SP.core.debug.js" />
///<reference path="file://C:/Program Files/Common Files/Microsoft Shared/Web Server Extensions/14/TEMPLATE/LAYOUTS/SP.debug.js" /> 


var idGroupToVerify1 = 4;
var idGroupToVerify2 = 5;
var nameGroup1 = "DevpTest Owners";
var nameGroup2 = "DevpTest Visitors";
var arrIsInThisGroup = new Array(2);
arrIsInThisGroup["DevpTest Owners"] = false;
arrIsInThisGroup["DevpTest Visitors"] = false;

ExecuteOrDelayUntilScriptLoaded(InitGroups, "sp.js");


//initialize groups ids for the current user
function InitGroups() {
    //debugger;
    CheckUser(idGroupToVerify1, nameGroup1);  //Judge if user is in the given group 
    //beacuse of some errors if execute together
    setTimeout("CheckUser(" + idGroupToVerify2 + ", '" + nameGroup2 + "')", 500);
}

//groupIDs is all the groups we need to check, but only 4 and 5 can enable the button
function EnablerScript(groupIDs) {
    if (groupIDs) {
        var isButtonEnabled = false;
        //groupid comes in string comma separated
        // '4' or '4,5'
        var arrGrId = groupID.split(',');
        var i = 0;
        for (i = 0; i < arrGrId.length; i++) {
            var currGroupID = arrGrId[i];
            if (currGroupID == idGroupToVerify1)
                isButtonEnabled = isButtonEnabled || arrIsInThisGroup[nameGroup1];
            if (currGroupID == idGroupToVerify2)
                isButtonEnabled = isButtonEnabled || arrIsInThisGroup[nameGroup2];
        }
        return isButtonEnabled;
    }
    return false;
}

// The below checks if the user exists in the group
function CheckUser(groupID, isInThisGroup) {
    //debugger;
    var context = SP.ClientContext.get_current();
    //I go to parent site if I'm in a subsite!
    var siteColl = context.get_site();
    web = siteColl.get_rootWeb();
    var groupCollection = web.get_siteGroups();

    // Get the Our Group's ID
    var _group = groupCollection.getById(groupID); // ID of the Group that we are checking
    var users = _group.get_users(); // Get all Users of the group we are checking
    context.load(_group);
    context.load(users);
    this._users = users;  //Get users of the checking group
    this._currentUser = web.get_currentUser(); // Get current login user
    this._isInThisGroup = isInThisGroup; 
    context.load(this._currentUser);
    context.executeQueryAsync(Function.createDelegate(this, this.CheckUserSucceeded), Function.createDelegate(this, this.failed));
}

//The below Checks  if User is the member of the specified group
function CheckUserSucceeded() {
    //debugger;
    if (this._users.get_count() > 0) {
        var _usersEnum = this._users.getEnumerator();
        while (_usersEnum.moveNext()) { //Scan all the users in specific group and to see if the current user exists in these users
            var user = _usersEnum.get_current(); //Get current login user
            if (user.get_loginName() == this._currentUser.get_loginName()) { //compare user
                //debugger;
                arrIsInThisGroup[this._isInThisGroup] = true; //if the user exists in the group then set the flag to be true
            }
        }
    }
}

function failed(sender, args) { alert("error"); }

项目如下：

 

说明：
1、关于如何让让用户定义的Ribbon引用外部Javascript文件，请参考此文Sharepoint学习笔记—Ribbon系列-- 9.如何让用户定义的Ribbon引用外部Javascript文件。
2、在CheckUserInGroup.js中，我们预定义了可以Enable此Button的Groups(groupid分别是4和5)，如果要检查的goups不在此预定义的goups内，或者当前LoginUser也不在此预定义的goups内则此Button不可使用。CheckUserInGroup.js代码如下，你可能根据你自身情况进行修改。

3、<CommandUIHandler>中的EnableScript属性为True则Button被Enable，否则Disable，而此值的设置是通过其内的Javascript {javascript:EnableScript(4,5)}返回值来实现的。

     转载：http://www.cnblogs.com/wsdj-ITtech/archive/2012/06/18/2426787.html