Question

我有一个列表，每行最多有一个附件，我正在尝试将此列表中的每个附件复制到新创建的图片库。

我可以通过以下代码复制1个附件

var Files;
var myContext;
function CopyAtt(ItemID) {
try {
        myContext = new SP.ClientContext.get_current();
        var myWeb = myContext.get_site().get_rootWeb(); 

        var folderPath = 'Lists/test/Attachments/' + ItemID;
        var Folder = myWeb.getFolderByServerRelativeUrl(folderPath);

        Files = Folder.get_files();
        myContext.load(Files);

        myContext.executeQueryAsync(Function.createDelegate(
                                    this, ExecuteCopyOnSuccess),
                                    Function.createDelegate(
                                    this, GetLeadsFail));                       
     }
    catch (err) {
        alert(err.Line);
    }
}

function GetLeadsFail(sender, args) {
    // Show error message
    alert('GetLeadsFail() failed:' + args.get_message());
}

function ExecuteCopyOnSuccess(sender, args) {
    for (var p = 0; p < this.Files.get_count(); p++) {
        var file = Files.itemAt(p);
        var filename = file.get_name();     
    }       
    if (filename != null) {
            var newUrl = 'PictureLibrary/' + filename;
            file.copyTo(newUrl, true);
            myContext.executeQueryAsync(null, null);
    }
}
$(document).ready(function() {
     CopyAtt(3);
}

当我尝试从CopyAtt(ItemID)拨打$(document).ready倍数时，代码在控制台中显示错误。

Uncaught TypeError: Cannot read property 'collectionHasNotBeenInitialized' of undefined
Uncaught RangeError: Maximum call stack size exceeded

我怀疑它与文件有关但我找不到任何线索，有人可以给我一些建议吗？

Answer 1

几天后我得到了一个解决方案，问题与文件无关，但是myContext.executeQueryAsync(null, null);。

首先，我多次致电CopyAtt(ItemID)，

    for (i=0; i< Items.Length; i++){
        CopyAtt(Items[i]);
    }

executeQueryAsync()中的

CopyAtt(ItemID)将打破循环并显示上述错误。

递归可以避免这种错误，而不是循环，而不是循环 executeQueryAsync()只会在一个完成后执行。

function CopyAtt(Items, itemIndex) {
try {
        myContext = new SP.ClientContext.get_current();
        var myWeb = myContext.get_site().get_rootWeb(); 

        var folderPath = 'Lists/test/Attachments/' + Items[itemIndex];
        var Folder = myWeb.getFolderByServerRelativeUrl(folderPath);

        Files = Folder.get_files();
        myContext.load(Files);

        myContext.executeQueryAsync(Function.createDelegate(
                                this, ExecuteLoadFileSuccess(Items, itemIndex);),
                                Function.createDelegate(
                                this, GetLeadsFail));                       
     }
    catch (err) {
        alert(err.Line);
    }
}
function GetLeadsFail(sender, args) {
    // Show error message
    alert('Request failed - ' + args.get_message());
}

function ExecuteLoadFileSuccess(Items, itemIndex, sender, args) {

    for (var p = 0; p < this.Files.get_count(); p++) {
        var file = Files.itemAt(p);
        var filename = file.get_name(); 
    }

    if (filename != null) {
            var newUrl = 'PictureLibrary/' + filename;
            file.copyTo(newUrl, true);
            myContext.executeQueryAsync(Function.createDelegate(
                                    this, function(){ExecuteCopyOnSuccess(Items, itemIndex);}),
                                    Function.createDelegate(
                                    this, GetLeadsFail));
    }
}

function ExecuteCopyOnSuccess(Items, itemIndex, sender, args) {
    //Call CopyAtt() after copy files success.
    if (itemIndex <Items.length-1) {
    CopyAtt(Items, itemIndex+1);
    }
}

$(document).ready(function() {
       //save all Items ID in an array.
       var Items = [2,3,6,7,8,10];
       CopyAtt(Items, 0);
}

通过javascript将多个附件从列表复制到文档库

1 个答案: