使用变量

Question

我有一个工作得很好的JavaScript文件，除了它没有返回一个字段。它们全部来自SharePoint列表，它显示为“未定义”但我认为我在开始时定义了它？

返回的信息显示在HTML pafe

上

我遇到问题的变量是'var txtfurtherinfo ="";'？其他一切都很好。任何帮助表示赞赏。 JavaScript在下面，它后来称为DeviceInformation ...

function getDeviceDetails() {
var txtTitle = "";
var txtName = "";
var txtOverview = "";
var txtAccessories = "";
var txtDevicetype = "";
var txtTypicalDeviceUsage ="";
var txtKnownSystemIssues ="";
var txtTrafficlight = "";
var imgDevicePicture = "";
var tempLCS2 = "";
var txtfurtherinfo ="";
var HTML = "<h3>Desktop</h3>";
var Laptop = "Y"
var Tabs="Y" 

var query = "http://example.com/sites/it/ITInfrastructure/_vti_bin/listdata.svc/Devices?$expand=Priority&$filter=Id eq " + window.DeviceId + "";






var call = $.ajax({
        url: query,
        type: "GET",
        dataType: "json",
        headers: {
            Accept: "application/json;odata=verbose"
        }       
    });
call.done(function (data,textStatus, jqXHR){
$.each(data.d.results, function(index, item) {
        var tempID = item.Id;
        var NameofDevice = item.Title;
        var tempTitle = item.Title;
        var DeviceOverView = item.Description;
        var AccessDetails = item.Accessories;
        var DeviceKind = item.DevicetypeValue;
        var Usage = item.TypicalUsage;
        var DevicePriority = item.PriorityValue;
        var DeviceImage = item.DeviceImage;
        var DeviceInformation = item.furtherinfo;

        txtTitle = "<p>" + NameofDevice + "<p>"; 
        txtName = "<p>" + NameofDevice + "</p>" +  DeviceKind + "</p>";
        txtOverview = "<p>" + DeviceOverView + "</p>";
        txtAccessories = "<p>" + AccessDetails + "</p>";  
        txtDevicetype = "<p>" + DeviceKind  + "</p>";
        txtTypicalDeviceUsage = "<p>" + Usage + "</p>";
        txtTrafficlight = "<p>" + DevicePriority + "</p>";
        txtfurtherinfo ="<p>" + DeviceInformation +  "</p>";
        imgDevicePicture = "<img src='" + DeviceImage + "'>";

    });
    $('#devicedetails').append($(txtTitle));  
    $('#deviceoverview').append($(txtOverview));
    $('#devicetitle').append($(txtTitle));
    $('devicename').append(txtName);
    $('#devicekind').append(txtDevicetype);
    $('#deviceacc').append(txtAccessories);
    $('#deviceuse').append(txtTypicalDeviceUsage);
    $('#devicestatus').append(txtTrafficlight);
    $('#furtherinfo').append(txtfurtherinfo);
    $('#imageContainer').append("<img src='/sites/IT/ITInfrastructure/SiteAssets/"+txtTrafficlight.replace(/<[^>]*>/g, '')+".png' />");
    $('.deviceimage').append(imgDevicePicture); 

});
call.fail(function (jqXHR,textStatus,errorThrown){
    alert("Error retrieving data: " + jqXHR.responseText);
});
}

Answer 1

在javascript中未定义的很多次是当您尝试访问范围中未定义的信息时。 您的item变量可能没有任何名为“Furtherinfo”的成员变量。 基于其他成员变量的表示法，它可以被称为“FurtherInfo”，“FurtherInfo”或类似的东西。