javascript - 在 jQuery 中发出 Ajax 请求时，事件仅触发一次

Question

我有几个使用 SPServices 从 SharePoint 填充的下拉列表。这部分效果很好。但是，我有一个按钮，单击该按钮即可从 SharePoint 加载数据，并使用下拉文本作为过滤器来获取将使用 DataTables 插件填充表的数据。这部分只工作一次；如果我再次单击该按钮，则什么也不会发生。

这就是我填充下拉菜单的方式:

$(document).ready(function () {
var theYear; // Selected Year
var theRO; // Selected RO
//Fills the Dropdown lists (Year and RO)
$().SPServices({
    operation: "GetListItems",
    async: false,
    listName: "{ListID}",
    CAMLViewFields: "<ViewFields><FieldRef Name='Fiscal_x0020_Year' /><FieldRef    Name='Regional_x0020_Office' /></ViewFields>",
    completefunc: function (xData, Status) {
        //Add Select Value option
        $("#dropdown").prepend($('<option>', {
            value: '',
            text: 'Select Fiscal Year'
        }));
        $("#dropdownRO").prepend($('<option>', {
            value: '',
            text: 'Select Regional Office'
        }));
        //Fetching Data from SharePoint    
        $(xData.responseXML).SPFilterNode("z:row").each(function () {
            var dropDown = "<option value='" + $(this).attr("ows_Fiscal_x0020_Year") + "'>" + $(this).attr("ows_Fiscal_x0020_Year") + "</option>";
            var dropDownRO = "<option value='" + $(this).attr("ows_Regional_x0020_Office") + "'>" + $(this).attr("ows_Regional_x0020_Office") + "</option>";
            $("#dropdown").append(dropDown);
            $("#dropdownRO").append(dropDownRO);
            /////////////Deletes duplicates from dropdown list////////////////
            var usedNames = {};
            $("#dropdown > option, #dropdownRO > option").each(function () {
                if (usedNames[this.text]) {
                    $(this).remove();
                } else {
                    usedNames[this.text] = this.value;
                }
            });
            ////Deletes repeated rows from table
            var seen = {};
            $('#myTable tr, #tasksUL li, .dropdown-menu li').each(function () {
                var txt = $(this).text();
                if (seen[txt]) $(this).remove();
                else seen[txt] = true;
            });
        });
    } //end of completeFunc
}); //end of SPServices
$('.myButton').on('click', function () {
    run()
});
}); //End jQuery Function

这是我在更改下拉列表中的选择后每次单击“myButton”时需要运行的函数:

        function run() {

theYear = $('#dropdown option:selected').text(); // Selected Year
theRO = $('#dropdownRO option:selected').text(); // Selected RO
var call = $.ajax({
    url: "https://blah-blah-blah/_api/web/lists/getByTitle('Consolidated%20LC%20Report')/items()?$filter=Fiscal_x0020_Year%20eq%20'" + theYear + "' and Regional_x0020_Office eq '" + theRO + "'&$orderby=Id&$select=Id,Title,Fiscal_x0020_Year,Notices_x0020_Received,Declined_x0020_Participation,Selected_x0020_Field_x0020_Revie,Selected_x0020_File_x0020_Review,Pending,Pending_x0020_Previous_x0020_Yea,Controversial,GFP_x0020_Reviews,NAD_x0020_Appeals,Mediation_x0020_Cases,Monthly_x0020_Cost_x0020_Savings,Monthly_x0020_Expenditure,Regional_x0020_Office,Month_Number", //Works, filters added
    type: "GET",
    cache: false,
    dataType: "json",
    headers: {
        Accept: "application/json;odata=verbose",
    }
}); //End of ajax function///
call.done(function (data, textStatus, jqXHR) {
    var oTable = $('#example').dataTable({
        "aLengthMenu": [
            [25, 50, 100, 200, -1],
            [25, 50, 100, 200, "All"]
        ],
            "iDisplayLength": -1, //Number of rows by default. -1 means All Records
        "sPaginationType": "full_numbers",
            "aaData": data.d.results,
            "bJQueryUI": false,
            "bProcessing": true,
            "aoColumns": [{
            "mData": "Id",
            "bVisible": false
        }, //Invisible column
        {
            "mData": "Title"
        }, {
            "mData": "Notices_x0020_Received"
        }, {
            "mData": "Declined_x0020_Participation"
        }, {
            "mData": "Selected_x0020_Field_x0020_Revie"
        }, {
            "mData": "Selected_x0020_File_x0020_Review"
        }, {
            "mData": "Pending"
        }, {
            "mData": "Pending_x0020_Previous_x0020_Yea"
        }, {
            "mData": "Controversial"
        }, {
            "mData": "GFP_x0020_Reviews"
        }, {
            "mData": "NAD_x0020_Appeals"
        }, {
            "mData": "Mediation_x0020_Cases"
        }, {
            "mData": "Monthly_x0020_Cost_x0020_Savings",
            "fnRender": function (obj, val) {
                return accounting.formatMoney(val);
            }
        }, {
            "mData": "Monthly_x0020_Expenditure",
            "fnRender": function (obj, val) {
                return accounting.formatMoney(val);
            }
        }],
            "bDeferRender": true,
        "bRetrieve": true,
        "bInfo": true,
        "bAutoWidth": true,
        "bDestroy": true,
            "sDom": 'T&;"clear"&;frtip',
            "oTableTools": {
            "aButtons": ["xls"],
                "sSwfPath": "../../Style Library/js/datatables/TableTools/media/swf/copy_csv_xls_pdf.swf",
        },
            "sSearch": "Filter",
            "fnDrawCallback": function () {
            //Add totals row
            var Columns = $("#example > tbody").find("> tr:first > td").length;
            $('#example tr:last').after('<tr><td  class="total"></td><td  class="total"></td><td  class="total"></td><td  class="total"></td><td  class="total"></td><td  class="total"></td><td  class="total"></td><td  class="total"></td><td  class="total"></td><td  class="total"></td><td  class="total"></td><td  class="total"></td><td  class="total"></td><td  class="total"></td></tr>');
            //Formating the Total row number to no decimals
            $("#example tr:last td:not(:first,:last)").text(function (i) {
                var t = 0;
                $(this).parent().prevAll().find("td:nth-child(" + (i + 2) + ")").each(function () {
                    t += parseFloat($(this).text().replace(/[\$,]/g, '') * 1);
                });
                return parseInt(t * 100, 10) / 100;
            });
            //Format the monthly expenditure and savings to currency formatFormating the currency
            var cell = new Array();
            cell[0] = $('#example tr:last td:nth-child(12)').text();
            cell[1] = $('#example tr:last td:nth-child(13)').text();
            $('#example tr:last').find('td:nth-child(12)').html(accounting.formatMoney(cell[0]));
            $('#example tr:last').find('td:nth-child(13)').html(accounting.formatMoney(cell[1]));
            $('#example tr:last').find('td:last').hide();
        } //hides extra td that was showing
    }); //End of Datatable()
}); //End of call.done function
$('#theTableDiv').slideDown();
} //end of run() function

我不是程序员，我只是想学习。我将不胜感激任何帮助。提前致谢

Answer 1

我猜您正在替换按钮所在页面的部分。 (您确实需要更整齐地格式化您的代码，以便...使用 JSFiddle.net 及其 TidyUp 按钮)。

如果是这种情况，您需要使用委托(delegate)事件处理程序:

$(document).on('click', '.myButton', function () {
    run()
});

它监听所需节点的静态祖先，然后在事件发生时运行选择器，然后它将函数应用于导致事件的任何匹配元素.

如果您没有方便的祖先，

document 是后备父级。不要将“body”用于委托(delegate)事件，因为它具有奇怪的行为。