Question

我有我希望获取作者姓名的名称的lib名称列表。为此，我在库名称上进行了每个循环并进行异步调用。我希望在呼叫结束后，使用库名称返回所有作者姓名。当我尝试使用Async调用时，它会在调用成功之前返回回调。所以我试图成功返回回调，但现在回复是在第一个请求完成后返回的。我尝试过同步调用，但它阻止了用户界面。那么最好的方法是什么呢。我的代码

function FetchLibAuthorID(LibCollection, callback) {
$.each(LibCollection, function (key, value) {
    $.ajax({
        url: value.MetadataURI + '?$select=schemaXml',
        type: "GET",
        headers: { "Accept": "application/json;odata=verbose" },
        success: function (data) {
            var listProperties = schemaXml2Json(data.d.SchemaXml);
            LibCollection[key].AuthorID = listProperties.Author;
            LibCollection[key].RootFolder = listProperties.RootFolder;
        },
        error: function (data2) {
            alert('error');
        }
    });
});
return callback(LibCollection);

}

Answer 1

var libCollection = [{ MetadataURI: "url1" }, { MetadataURI: "url2" }];

function loadLibrary(complete) {
    if (libCollection.length === 0) {
        complete();
        return;
    }

    var lib = libCollection.pop();
    $.ajax({
        url: lib.MetadataURI + '?$select=schemaXml',
        type: "GET",
        headers: { "Accept": "application/json;odata=verbose" },
        complete: function (data) {
            var listProperties = schemaXml2Json(data.d.SchemaXml);
            LibCollection[key].AuthorID = listProperties.Author;
            LibCollection[key].RootFolder = listProperties.RootFolder;

            loadLibrary(complete);
        }
    });
};

// call the function

loadLibrary(function() {
    alert("all libraries have been loaded")
});

Answer 2

        function FetchLibAuthorID(LibCollection, callback) {
    var count=0;
        $.each(LibCollection, function (key, value) {
    count++;
            $.ajax({
                url: value.MetadataURI + '?$select=schemaXml',
                type: "GET",
                headers: { "Accept": "application/json;odata=verbose" },
                success: function (data) {
    count--;
                    var listProperties = schemaXml2Json(data.d.SchemaXml);
                    LibCollection[key].AuthorID = listProperties.Author;
                    LibCollection[key].RootFolder = listProperties.RootFolder;
                },
                error: function (data2) {
                    alert('error');
                }
            });
        });

    while(count>0)
    {

    }
  return callback(LibCollection);
}

多个Ajax异步调用

2 个答案: