Javascript Ajax 从 XML 多次调用 returns 相同的字符串。如何避免这种情况？

Question

我遇到以下问题：当我调用 Ajax 为人们提供“自动填充”字段的选项时，它会提供相同的字符串（如下图所示）。问题是，Ajax 调用使用 URL，其中字符串多次出现在 XML 中。

例如调用时

/tools/_api/web/lists/getbytitle('Besucheranmeldung')/Items?&$filter=substringof('Aalen', FirmaNeu)&$select=FirmaNeu

XML 看起来像这样：

<?xml version="1.0" encoding="utf-8"?><feed xml:base="https://mylink/tools/_api/" xmlns="http://www.w3.org/2005/Atom" xmlns:d="http://schemas.microsoft.com/ado/2007/08/dataservices" xmlns:m="http://schemas.microsoft.com/ado/2007/08/dataservices/metadata" xmlns:georss="http://www.georss.org/georss" xmlns:gml="http://www.opengis.net/gml"><id>fbe3c761-2113-4be6-b8dd-599cf842df2f</id><title /><updated>2020-12-16T12:58:45Z</updated><entry m:etag="&quot;2&quot;"><id>Web/Lists(guid'5d3a8bf8-7edf-4b7e-aab8-5df6cd818573')/Items(10891)</id><category term="SP.Data.BesucheranmeldungListItem" scheme="http://schemas.microsoft.com/ado/2007/08/dataservices/scheme" /><link rel="edit" href="Web/Lists(guid'5d3a8bf8-7edf-4b7e-aab8-5df6cd818573')/Items(10891)" /><title /><updated>2020-12-16T12:58:45Z</updated><author><name /></author><content type="application/xml"><m:properties><d:FirmaNeu>IGM Aalen</d:FirmaNeu></m:properties></content></entry><entry m:etag="&quot;2&quot;"><id>Web/Lists(guid'5d3a8bf8-7edf-4b7e-aab8-5df6cd818573')/Items(10893)</id><category term="SP.Data.BesucheranmeldungListItem" scheme="http://schemas.microsoft.com/ado/2007/08/dataservices/scheme" /><link rel="edit" href="Web/Lists(guid'5d3a8bf8-7edf-4b7e-aab8-5df6cd818573')/Items(10893)" /><title /><updated>2020-12-16T12:58:45Z</updated><author><name /></author><content type="application/xml"><m:properties><d:FirmaNeu>'IGM Aalen</d:FirmaNeu></m:properties></content></entry><entry m:etag="&quot;2&quot;"><id>Web/Lists(guid'5d3a8bf8-7edf-4b7e-aab8-5df6cd818573')/Items(10894)</id><category term="SP.Data.BesucheranmeldungListItem" scheme="http://schemas.microsoft.com/ado/2007/08/dataservices/scheme" /><link rel="edit" href="Web/Lists(guid'5d3a8bf8-7edf-4b7e-aab8-5df6cd818573')/Items(10894)" /><title /><updated>2020-12-16T12:58:45Z</updated><author><name /></author><content type="application/xml"><m:properties><d:FirmaNeu>IGM Aalen</d:FirmaNeu></m:properties></content></entry><entry m:etag="&quot;2&quot;"><id>Web/Lists(guid'5d3a8bf8-7edf-4b7e-aab8-5df6cd818573')/Items(10895)</id><category term="SP.Data.BesucheranmeldungListItem"

我使用以下代码获取下拉列表：

var requestHeaders = {
    "Accept": "application/json;odata=verbose",
    "X-RequestDigest": NWF$("#__REQUESTDIGEST").val()
};


function startAutoComplete(varTextBoxId, listname) {
    console.log("startAutoComplete called!");

    NWF$("#" + varTextBoxId).autocomplete({

        source: function (request, response) {

            var query = getQuery(request.term, listname);

            var testurl = "/tools/_api/web/lists/getbytitle('" + listname + "')/Items?&$filter=" + query;

            console.log("testurl: " + testurl);

            NWF$.ajax({

                url: "/tools/_api/web/lists/getbytitle('" + listname + "')/Items?&$filter=" + query,
                contentType: "application/json;odata=verbose",
                headers: requestHeaders,

                error: function (xhr, ajaxOptions, thrownError) {
                    alert("error:" + thrownError + "\n" + xhr.status);
                },

                success: function (data) {
                    response(NWF$.map(data.d.results, function (item) {


                        switch (listname) {
                            case "Besucheranmeldung":

                                return {
                                    label: item.FirmaNeu,
                                    value: item.FirmaNeu,
                                    id: item.FirmaNeu,
                                    listname: listname
                                }
                                break;

                        }
                        
                    }));
                }
            });
        },
        minLength: 2,
        select: function (event, ui) {
            

        },
        open: function () {
            NWF$(this).removeClass("ui-corner-all").addClass("ui-corner-top");
        },
        close: function () {
            NWF$(this).removeClass("ui-corner-top").addClass("ui-corner-all");
        }
    });

}

function getQuery(requestStr, listname) {
    var retvalue = "";

    requestStr = encodeURIComponent(requestStr);

    switch (listname) {

        case "Besucheranmeldung":
            retvalue = "substringof('" + requestStr + "', FirmaNeu)" + "&$select=FirmaNeu";
            break;
    }
    
    // console.log("retvalue: " + retvalue);
    return retvalue;
    
}

如何避免这种情况？有没有办法制作一个 if 语句来检查下拉列表是否两次包含相同的字符串以避免让它出现多次？

当我执行 console.log(data.d.results); 时，我得到以下信息：

Answer 1

通过更改代码修复了它：

var requestHeaders = {
    "Accept": "application/json;odata=verbose",
    "X-RequestDigest": NWF$("#__REQUESTDIGEST").val()
};


function startAutoComplete(varTextBoxId, listname) {
    console.log("startAutoComplete called!");

    NWF$("#" + varTextBoxId).autocomplete({

        source: function (request, response) {

            var query = getQuery(request.term, listname);

            NWF$.ajax({

                url: "/tools/_api/web/lists/getbytitle('" + listname + "')/Items?&$filter=" + query,
                contentType: "application/json;odata=verbose",
                headers: requestHeaders,

                error: function (xhr, ajaxOptions, thrownError) {
                    alert("error:" + thrownError + "\n" + xhr.status);
                },

                success: function (data) {
                    // console.log(data.d.results);
                    var firmaResults;
                    var firmen = [];
                    firmaResults = groupBy(data.d.results,'FirmaNeu');
                    // console.log(firmaResults);

                    for (var i = 0; i < firmaResults.length; i++ ){
                        firmen[i] = firmaResults[i];
                    }

                    var counter = -1;

                    response(NWF$.map(data.d.results, function (item) {


                        switch (listname) {
                            case "Besucheranmeldung":
                                counter++;
                                if (counter > firmaResults.length){
                                    return;
                                }
                                return {
                                    label: firmen[counter],
                                    value: firmen[counter],
                                    id: firmen[counter],
                                    listname: listname
                                }

                                break;
                        }

                    }));

                }
            });
        },
        minLength: 2,
        select: function (event, ui) {


        },
        open: function () {
            NWF$(this).removeClass("ui-corner-all").addClass("ui-corner-top");
        },
        close: function () {
            NWF$(this).removeClass("ui-corner-top").addClass("ui-corner-all");
        }
    });
    
}

function getQuery(requestStr, listname) {
    var retvalue = "";

    requestStr = encodeURIComponent(requestStr);

    switch (listname) {

        case "Besucheranmeldung":
            retvalue = "substringof('" + requestStr + "', FirmaNeu)" + "&$select=FirmaNeu";
            break;
    }
    
    // console.log("retvalue: " + retvalue);
    return retvalue;
    
}


function groupBy(items,propertyName)
{
    var result = [];
    $.each(items, function(index, item) {
        if ($.inArray(item[propertyName], result) == -1) {
            result.push(item[propertyName]);
        }
    });
    return result;
}

Javascript Ajax 从 XML 多次调用 returns 相同的字符串。如何避免这种情况？

Javascript Ajax call returns same string multiple times from XML. How can this be avoided?

javascript

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autofill