Question

我正在尝试禁用用户在与当前记录相关联的附件处于编辑模式时删除它们的功能。我在Sharing to the Point上找到了此代码。为了运行它，我不得不进行一些更改。我认为我的问题是我的从属脚本未正确加载，因此该函数出错了。代码是：

//if (document.referrer == "" || document.referrer == null) 
if (window.location.pathname.toLowerCase().indexOf("editform.aspx") > -1) {
   // These two lines are required, without it my code won't run.
   SP.SOD.executeFunc('SP.js', 'SP.ClientContext');
   SP.SOD.executeFunc('sp.runtime.js');

   var listName = "BSMRequests"; 
   var currentItemID;
   var attachmentAuthor = [];
   var itemArray = [];

   $(document).ready(function(){  
      // Get ID of the current item.
      currentItemID = window.location.href.toLowerCase();
      currentItemID = currentItemID.substring(currentItemID.toLowerCase().indexOf("?id=") + 4,currentItemID.toLowerCase().indexOf("&source="));
      // Remove the line below in case the URL of your item is 
      // not shown as a modal dialog.
      //currentItemID = currentItemID.substring(0, currentItemID.toLowerCase().indexOf("&isdlg"));
      //console.log('currentItemID='+currentItemID);

      // Save the ID of the current item in the session 
      // (not necessary, but I prefer it this way)
      sessionStorage.setItem("SessionItemCurrentItemID", currentItemID);

      // Get attachments of current item.
      var url = "/_api/Web/Lists/getByTitle('" + listName + "')/Items(" + currentItemID + ")/AttachmentFiles",
         qs = "?$select=ID,Author/Title,*&$expand=Author,AttachmentFiles",
         siteUrl = "https://share.health.wisconsin.gov/hc/teams/MES";
      $.ajax( {
         url : siteUrl + url + qs,
         type : 'GET',
         headers : {
            'accept' : 'application/json;odata=verbose',
            'content-type' : 'application/json;odata=verbose'
         },
         success : successHandler,
         fail : failHandler
      });  

      function successHandler(data) {
         if (data) {
         // If the item has attachments, then run this function.
               //console.log('yes? attachments');
            $.each(data.d.results, function() {
               //console.log('processing results');
               getWebProperties(sessionStorage.getItem("SessionItemCurrentItemID"));
            });
         } //else {console.log('No attachments');}
      }

      function failHandler(data, errCode, errMessage) { 
         console.log('Error: ' + errMessage); 
      }

      function getWebProperties(itemID) {
         var attachmentFiles;
         var ctx = new SP.ClientContext.get_current();
         var web = ctx.get_web();
         var attachmentFolder = web.getFolderByServerRelativeUrl('Lists/'+listName+'/Attachments/' + itemID);
         attachmentFiles = attachmentFolder.get_files();
         ctx.load(attachmentFiles);
         ctx.executeQueryAsync(function(){
            // I can't remember what the $2_1 was again, but anyway...
            for (var j = 0; j < attachmentFiles["$2_1"].length; j++) {
               var author = attachmentFiles.itemAt(j).get_author(); 
               attachmentAuthor.push([attachmentFiles.itemAt(j).get_name(),author]);

               // You'll need to load the author along with the title parameter,
               // in order to be able to fetch the name of the author later.
               ctx.load(author, 'Title');
               ctx.executeQueryAsync(function(){}, function(err) {});
            }
            // Loop is not necesarrily required, but you will need to set a
            // timeout. Comes in handy when you have a lot of attachments.
            checkAttachmentsLoop();
         }, function(err) {});
      }

      function checkAttachmentsLoop() {
         setTimeout(function(){
            if (attachmentAuthor.length) {
               checkAttachments();
            }
            else {
               checkAttachmentsLoop();
            }
         },100);
      }

      function checkAttachments() {
         for (var h = 0; h < attachmentAuthor.length; h++) {
            // if you log attachmentAuthor[h][0] to the concole, you'll get 
            // the name of the attachment.
            // if you log attachmentAuthor[h][1].get_title() to the console,
            // you'll get the name of the author.

            var currentAuthor = attachmentAuthor[h][1].get_title();
            // If the current user is not the author of the current attachment,
            // then we disable the ability to delete the attachment from the item.
            // var currentUser = "Harvancik, Steve Skkk";
            var currentUser = sessionStorage.getItem("sessionItemUserName");
            if (currentAuthor != currentUser) {
               var tr = document.getElementById("idAttachmentsTable").getElementsByTagName("tr");
               for (var i = 0; i < tr.length; i++) {
                  var currentTR = $(tr)[i];
                  var anchors = $(currentTR).find("a")[0];
                  var deletes = $(currentTR).find("a")[1];
                  if (anchors.innerHTML == attachmentAuthor[h][0]) {
                     $(currentTR).attr("disabled", "disabled");
                     $(anchors).css("color", "#b1b1b1");
                     $(anchors).removeAttr("href");
                     $(anchors).removeAttr("onclick");
                     $(deletes).css("text-decoration", "line-through");
                     $(deletes).css("color", "#b1b1b1");
                     $(deletes).removeAttr("href");
                     $(deletes).removeAttr("onclick");
                  }
               }
            }
         }
      }
   })
}
else {
   if (sessionStorage.getItem("SessionItemCurrentItemID") != null) {
      sessionStorage.removeItem("SessionItemCurrentItemID");
   }
}

我得到的错误属于以下类型：

Uncaught Error: The property or field 'Title' has not been initialized. It has not been requested or the request has not been executed. It may need to be explicitly requested.

我首先尝试将其放入函数中，并通过ExecuteOrDelayUntilScriptLoaded进行调用，但这没有用。调用此函数并在运行之前加载相关脚本的最佳方法是什么？

谢谢

Answer 1

您将author推送到attachmentAuthor之前的ctx.executeQueryAsync，因此尚未加载该值，您可以将其加载到checkAttachments中。

测试脚本：

 <script type="text/javascript" src="https://code.jquery.com/jquery-1.12.4.js"></script>
    <script type="text/javascript">
        //if (document.referrer == "" || document.referrer == null)
        if (window.location.pathname.toLowerCase().indexOf("editform.aspx") > -1) {
            // These two lines are required, without it my code won't run.
            SP.SOD.executeFunc('SP.js', 'SP.ClientContext');
            SP.SOD.executeFunc('sp.runtime.js');

            var listName = "MyList";
            var currentItemID;
            var attachmentAuthor = [];
            var itemArray = [];

            $(document).ready(function () {
                // Get ID of the current item.
                currentItemID = window.location.href.toLowerCase();
                currentItemID = currentItemID.substring(currentItemID.toLowerCase().indexOf("?id=") + 4, currentItemID.toLowerCase().indexOf("&source="));
                // Remove the line below in case the URL of your item is
                // not shown as a modal dialog.
                //currentItemID = currentItemID.substring(0, currentItemID.toLowerCase().indexOf("&isdlg"));
                //console.log('currentItemID='+currentItemID);

                // Save the ID of the current item in the session
                // (not necessary, but I prefer it this way)
                sessionStorage.setItem("SessionItemCurrentItemID", currentItemID);

                // Get attachments of current item.
                var url = "/_api/Web/Lists/getByTitle('" + listName + "')/Items(" + currentItemID + ")/AttachmentFiles",
                    qs = "?$select=ID,Author/Title,*&$expand=Author,AttachmentFiles",
                    siteUrl = _spPageContextInfo.webAbsoluteUrl;
                $.ajax({
                    url: siteUrl + url + qs,
                    type: 'GET',
                    headers: {
                        'accept': 'application/json;odata=verbose',
                        'content-type': 'application/json;odata=verbose'
                    },
                    success: successHandler,
                    fail: failHandler
                });

                function successHandler(data) {
                    if (data) {
                        // If the item has attachments, then run this function.
                        //console.log('yes? attachments');
                        $.each(data.d.results, function () {
                            //console.log('processing results');
                            getWebProperties(sessionStorage.getItem("SessionItemCurrentItemID"));
                        });
                    } //else {console.log('No attachments');}
                }

                function failHandler(data, errCode, errMessage) {
                    console.log('Error: ' + errMessage);
                }

                function getWebProperties(itemID) {
                    var attachmentFiles;
                    var ctx = new SP.ClientContext.get_current();
                    var web = ctx.get_web();
                    var attachmentFolder = web.getFolderByServerRelativeUrl('Lists/' + listName + '/Attachments/' + itemID);
                    attachmentFiles = attachmentFolder.get_files();
                    ctx.load(attachmentFiles);
                    ctx.executeQueryAsync(function () {
                        // I can't remember what the $2_1 was again, but anyway...
                        for (var j = 0; j < attachmentFiles["$2_1"].length; j++) {
                            var author = attachmentFiles.itemAt(j).get_author();
                            attachmentAuthor.push([attachmentFiles.itemAt(j).get_name(), author]);                            
                        }
                        // Loop is not necesarrily required, but you will need to set a
                        // timeout. Comes in handy when you have a lot of attachments.
                        checkAttachmentsLoop();
                    }, function (err) { });
                }

                function checkAttachmentsLoop() {
                    setTimeout(function () {
                        if (attachmentAuthor.length) {
                            checkAttachments();
                        }
                        else {
                            checkAttachmentsLoop();
                        }
                    }, 100);
                }

                function checkAttachments() {
                    var ctx = new SP.ClientContext.get_current();
                    for (var h = 0; h < attachmentAuthor.length; h++) {
                        // if you log attachmentAuthor[h][0] to the concole, you'll get
                        // the name of the attachment.
                        // if you log attachmentAuthor[h][1].get_title() to the console,
                        // you'll get the name of the author.

                        // You'll need to load the author along with the title parameter,
                        // in order to be able to fetch the name of the author later.
                        ctx.load(attachmentAuthor[h][1], 'Title');
                        ctx.executeQueryAsync(function () {
                            var currentAuthor = attachmentAuthor[h][1].get_title();
                            console.log(currentAuthor);
                        }, function (err) {
                            console.log(err);
                        });
                        //var currentAuthor = attachmentAuthor[h][1].get_title();
                        // If the current user is not the author of the current attachment,
                        // then we disable the ability to delete the attachment from the item.
                        // var currentUser = "Harvancik, Steve Skkk";
                        var currentUser = sessionStorage.getItem("sessionItemUserName");
                        if (currentAuthor != currentUser) {
                            var tr = document.getElementById("idAttachmentsTable").getElementsByTagName("tr");
                            for (var i = 0; i < tr.length; i++) {
                                var currentTR = $(tr)[i];
                                var anchors = $(currentTR).find("a")[0];
                                var deletes = $(currentTR).find("a")[1];
                                if (anchors.innerHTML == attachmentAuthor[h][0]) {
                                    $(currentTR).attr("disabled", "disabled");
                                    $(anchors).css("color", "#b1b1b1");
                                    $(anchors).removeAttr("href");
                                    $(anchors).removeAttr("onclick");
                                    $(deletes).css("text-decoration", "line-through");
                                    $(deletes).css("color", "#b1b1b1");
                                    $(deletes).removeAttr("href");
                                    $(deletes).removeAttr("onclick");
                                }
                            }
                        }
                    }
                }
            })
        }
        else {
            if (sessionStorage.getItem("SessionItemCurrentItemID") != null) {
                sessionStorage.removeItem("SessionItemCurrentItemID");
            }
        }
    </script>

无法解决“标题”尚未初始化

1 个答案: