javascript - 通过JavaScript将多个附件从列表复制到文档库

我有一个列表，每行最多有1个附件，我正在尝试将每个附件从此列表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)多次调用$(document).ready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，但找不到任何线索，有人可以给我一些建议吗？

最佳答案

几天后我得到了解决方案，问题与文件无关，但与myContext.executeQueryAsync(null, null);有关。

首先，我多次拨打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面的错误。

递归可以避免此类错误，而不是for循环，并且每个
executeQueryAsync()将仅在一个完成后执行。

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);
}