SharePoint 中时间轴 Timeline的实现

客户需要在OA中实现每日动态功能，能够记录每一位员工的每天的工作动态，我很快想到了时间轴，因为时间轴能很直观的现实员工每一刻的动态。就像Facebook的Timeline效果（点击查看）。

尝试着搜索这个效果，园友的这篇博文正好给我启发，接下来就去实现吧。

成果演示

最终的效果如下所示：

点击每个员工的姓名，即可进入他当天的工作动态（只能看），若点击自己的名字（既能看又能发送/编辑/删除动态），如下所示：

动态的详细页，如下所示：

点击时间轴，即可新增动态，如下所示：

编辑效果，鼠标移至内容区域，现实黄色提醒，如下所示：

单击即可显示编辑界面，如下所示：

移开鼠标，即可自动保存。

当然如果想把一条当太删掉，点击右上角X即可。

实现原理

关于效果的实现原理可以参考这篇文章。

了解了上面提到的这篇文章之后（Masonry.js），接下来就是Sharepoint 客户端对象模型的实现了，比如Ecmascript。

• 根据登陆的用户点击的员工名字获取当天的动态，这儿需要利用CAML拼接出查询条件

function GetCurrentUser(){
    //Get the current context
    var context=new SP.ClientContext.get_current();
    //Load the web object
    var web=context.get_web();
    //Get current user
    this.currentUser=web.get_currentUser();
    //load currentUser
    context.load(currentUser);
    //Make a query call to execute the above statements
    context.executeQueryAsync(OnGetCurrentUserSuccess,OnGetCurrentUserFailed);
}

function OnGetCurrentUserSuccess(){
    GetDailyWorks();
}
function OnGetCurrentUserFailed(sender,args){
    console.log('Request failed. ' + args.get_message() + '\n' + args.get_stackTrace());
}

function GetDailyWorks(){
    //Get the current context
    var context=new SP.ClientContext.get_current();
    //Load the web object
    var web=context.get_web();
    //Get the list
    var list=web.get_lists().getByTitle(listNameForDailyWork);
    //Get items by caml in the specific list
    var camlQuery=new SP.CamlQuery();
    var d=new Date();
    //Get specific field name
    this.userNameWhenClickView=$("#currentUserHidden").val();
    camlQuery.set_viewXml('<View><Query>'+
                                         '<Where>'+
                                             '<And>'+
                                               '<And>'+
                                                 '<And>'+
                                                         '<Eq>'+
                                                                 '<FieldRef Name=\'Title\'/>'+
                                                                 '<Value Type=\'Text\'>'+userNameWhenClickView+'</Value>'+
                                                         '</Eq>'+
                                                         '<Eq>'+
                                                                 '<FieldRef Name=\'CurrentYear\'/>'+
                                                                 '<Value Type=\'Text\'>'+d.getFullYear()+'</Value>'+
                                                         '</Eq>'+
                                                 '</And>'+
                                                 '<Eq>'+
                                                     '<FieldRef Name=\'CurrentMonth\'/>'+
                                                     '<Value Type=\'Text\'>'+(d.getMonth()+)+'</Value>'+
                                                 '</Eq>'+
                                               '</And>'+
                                               '<Eq>'+
                                                     '<FieldRef Name=\'CurrentDay\'/>'+
                                                     '<Value Type=\'Text\'>'+d.getDate()+'</Value>'+
                                               '</Eq>'+
                                            '</And>'+
                                         '</Where>'+
                                         '<OrderBy>'+
                                             '<FieldRef Name=\'Created\' Ascending=\'True\'/>'+
                                         '</OrderBy></Query></View>');
    dailyWorks=list.getItems(camlQuery);
    //Load the web in the context and retrieve only selected columns to improve perfomance
    context.load(dailyWorks,'Include(ID,Title,DailyContent,Created)');
    //Make a query call to execute the above statements
    context.executeQueryAsync(OnGetDailyWorksSuccess,OnGetDailyWorkFailed);

}
function OnGetDailyWorksSuccess(){
    //Get the collection
    var dailyWorksCollection=dailyWorks.getEnumerator();
    //Iterate through daily works
    while(dailyWorksCollection.moveNext()){
        //Load the current daily work item in iterate
        var workItem=dailyWorksCollection.get_current();
        //Add work item to container

        addWorkToContainer(workItem.get_item('ID'),workItem.get_item('Title'),workItem.get_item('DailyContent'),workItem.get_item("Created"));
    }
    //Items has added in container and execute AutoMasonry method
    AutoMasonry();
    //Init in line edit if current user has permission to edit
    if(userNameWhenClickView==currentUser.get_title()){
        InitInlineEdit($('.editable, .editable-area'));
    }

}
//Error Handler
function OnGetDailyWorkFailed(sender,args){
    console.log('Request failed. ' + args.get_message() + '\n' + args.get_stackTrace());
}

• 当然Add一个Item也是比较方便的，当Add Item完毕后，很重要的一点是利用Masonry Reload一下所有的item

function AddNewDailyWorkItem(content){
    //get the current context
    var context=new SP.ClientContext.get_current();
    //Load the web object
    var web=context.get_web();
    //Get the list
    var list =web.get_lists().getByTitle(listNameForDailyWork);
    //create the ListItemInfomational object
    var listItemInfo=new SP.ListItemCreationInformation();
    //add the item to the list
    this.listItem=list.addItem(listItemInfo);
    //get current user display name
    var userDisplayName=currentUser.get_title();
    //Assign values for fields
    listItem.set_item('Title',userDisplayName);
    listItem.set_item('DailyContent',content);
    //Get current year ,month,day and assign values for fields
    var newObj=new Date();
    listItem.set_item('CurrentYear',newObj.getFullYear());
    listItem.set_item('CurrentMonth',newObj.getMonth()+);
    listItem.set_item('CurrentDay',newObj.getDate());
    //Apply changes to item
    listItem.update(listItem);
    context.load(listItem);
    //Make a query call to execute the above statements
    context.executeQueryAsync(AddDailyWorkItemSuccess,AddDailyWorkItemFailed);

}
function AddDailyWorkItemSuccess(sender,args){

        var content = $("#update").val();
        $('<div class="item"><a href="#" itemId="'+listItem.get_id()+'" class="deletebox">X</a>' + '<div class="inner"><p itemId="'+listItem.get_id()+'" class="editable-area">' + content + '</p></div><p class="sendStyle">发送于'+(new Date()).getHours()+':'+((new Date()).getMinutes()<?""+(new Date()).getMinutes():(new Date()).getMinutes())+'</p></div>').insertBefore("div#popup");
        //reload masnory
        $("#container").masonry("reload");
        //Hiding existing arrows
        $(".rightCorner").hide();
        $(".leftCorner").hide();
        //injecting fresh arrows
        Arrow_Points();
        //clear popup text box value
        $("#update").val("");
        //popup hide
        $("#popup").hide();
        //Init in line edit
        $('p[itemId='+listItem.get_id()+']');
        InitInlineEdit($('p[itemId='+listItem.get_id()+']'));

}
function AddDailyWorkItemFailed(sender,args){
    console.log('Request failed. ' + args.get_message() + '\n' + args.get_stackTrace());
}

• Update 和Add是相同的逻辑，记得最后Reload即可

function UpdateDailyWorkItem(itemId,updateContent){
    //If no title is setted then show alert and set focus
    /*if(updateContent==''){
        $()
    }*/
    //Get the current context
    var context = new SP.ClientContext.get_current();
    //Load the web object
    var web=context.get_web();
    //Get the list
    var list=web.get_lists().getByTitle(listNameForDailyWork);
    //Get item to update by Id from the specific list
    this.listItem=list.getItemById(itemId);
    //Set the new property value
    listItem.set_item('DailyContent',updateContent);
    //Call the update method to commit the change
    listItem.update();

    context.executeQueryAsync(updateWorkItemSuccess,updateWorkItemFailed);

}

function updateWorkItemSuccess(){
    $editable
    .removeClass('active-inline')
    .children()
    .replaceWith(edited);

    if ($editable.hasClass('editable-area')) {
        rapture($editable);
    }
    //reload masnory
    $("#container").masonry("reload");
    //Hiding existing arrows
    $(".rightCorner").hide();
    $(".leftCorner").hide();
    //injecting fresh arrows
    Arrow_Points();

}

function updateWorkItemFailed(){

}

• Delete Item，根据item id进行删除，同Add和Update逻辑，删除完毕后也是需要Reload

//Delete daily work item by item id
function deleteDailyWork(workElement){
    //Get the daily work item id
    var itemId=workElement.attr("itemId");
    //Get the current context
    var context=new SP.ClientContext.get_current();
    //Load the web object
    var web=context.get_web();
    //Get the list
    var list=web.get_lists().getByTitle(listNameForDailyWork);
    //Get item to delete by if form the list
    var itemToDelete=list.getItemById(itemId);
    //Add Delete method to the query
    itemToDelete.deleteObject();
    //Execute the query to perform the deletion
    context.executeQueryAsync(DeleteWorkItemSuccess,DeleteWorkItemFailed);

}

function DeleteWorkItemSuccess(){
     //Masonry Reload
}

function DeleteWorkItemFailed(sender,args){
    console.log('Request failed. ' + args.get_message() + '\n' + args.get_stackTrace());
}

总结

值得注意的是我将每日的动态存入List中，对于List，他能负担的item的个数和一次从数据库里获取的item都是有限制，对于数据量很大的情况下，是有风险的。