当我在过去创建这些类型的小部件时，我是这样做的，它几乎和你的一样，但是请注意on change处理程序...

var select = new dijit.form.FilteringSelect({
    id : "fields-select-" + expNum,
    store : store,
    required : false,
    onChange: function(value){
        //do something here
    }
}, fieldinput);

字符串

• 更新：从重新阅读您的帖子，我可以看到你已经尝试过这种方法，我只是想我会离开它的答案供参考，因为它已经为我在过去的工作.*

更新
关于dojo 1.8，可以考虑使用dojo's templated widgets来帮助删除JavaScript中的大量编程创建元素，还可以参考其他一些Dojo教程，如getting selective with dijit、custom widgets和defining modules教程。它们将真正帮助您充分利用Dojo小部件。“获得选择性”小部件中包含过滤选择小部件。
很难解释为什么onChange事件只被调度一次。我能说的是，你要完全简化所有的事情，你只有过滤的选择小部件，并确保你可以在隔离的情况下捕获onChange事件不止一次。然后开始集成你的其余代码。
对不起，我不能给予你任何确切的答复，我会继续寻找。
更新
好的，我已经把你的代码放到了一个使用dojo 1.8的测试环境中运行，我不得不去掉层对象，用一个简单的数组代替它，但是看起来工作正常。我还用define把代码变成了一个模块（在modules tutorial中解释过）。下面是代码...

define(["dijit/Dialog",
        "dijit/form/FilteringSelect",
        "dojo/store/Memory",
        "dijit/form/MultiSelect",
        "dijit/form/TextBox",
        "dijit/form/Textarea",
        "dijit/form/NumberSpinner",
        "dijit/form/DateTextBox"],

    function (){

        var expNum = 1;
        var queryDiv;
        var layer;
        var dialog;

        function BuildExpression(layer) {

            var expDiv = dojo.create("div", {
                class : "expression",
                id : "expression-" + expNum
            }, queryDiv);

            var filterDiv = dojo.create("div", {
                class : "filter",
                id : "filter-" + expNum
            }, expDiv);

            var fieldSpan = dojo.create("span", {
                id : "field-" + expNum,
                class : "field"
            }, filterDiv);

            var operatorSpan = dojo.create("span", {
                id : "operator-" + expNum,
                class : "operator"
            }, filterDiv);

            var valueSpan = dojo.create("span", {
                id : "value-" + expNum,
                class : "value"
            }, filterDiv);

            var removeSpan = dojo.create("span", {
                id : "remove-" + expNum,
                class : "remove"
            }, filterDiv);

            var removeInput = dojo.create("button", {
                id : "button"
            }, removeSpan);

            var removeButton = new dijit.form.Button({
                id : "removeExpression" + expNum,
                label : "Remove",
                onClick : function() {
                    dojo.destroy(expDiv);
                }
            }, removeInput);

            var fieldinput = dojo.create("input", {
                id : "field-input-" + expNum
            }, fieldSpan);

            var fields = [{"name":"value1", "id":"v1"}, {"name":"value2", "id":"v2"}];
            //dojo.forEach(layer.layerObject.fields, function(field, index) {
            //    if (index < layer.layerObject.infoTemplate.info.fieldInfos.length && layer.layerObject.infoTemplate.info.fieldInfos[index].visible == true) {
            //        field.operatorSpan = operatorSpan;
            //        field.valueSpan = valueSpan;
            //        fields.push({
            //            name : field.alias,
            //            id : field
            //        });
            //    }
           // });

            var store = new dojo.store.Memory({
                data : fields
            });

            var select = new dijit.form.FilteringSelect({
                id : "fields-select-" + expNum,
                store : store,
                required : false,
                intermediateChanges : true
            }, fieldinput);

            dojo.connect(select, 'onChange', function(value){console.log(value)});
            expNum++
        }

        function LoadOperatorValue(field) { debugger;
            dojo.empty(field.operatorSpan);
            dojo.empty(field.valueSpan);

            if ("domain" in field && "codedValues" in field.domain) {

                field.operatorSpan.innerHTML = "IS";

                var sel = dojo.create("select", {
                    id : "multiselect-" + expNum
                }, field.valueSpan);

                dojo.forEach(field.domain.codedValues, function(cv, index) {
                    dojo.create("option", {
                        innerHTML : cv.name,
                        value : cv.code
                    }, sel);
                });

                var multiselect = new dijit.form.MultiSelect({}, sel);

            } else if (field.type == "esriFieldTypeString") {

                var operatorInput = dojo.create("input", {
                    id : "operator-input"
                }, field.operatorSpan);

                var operators = [{
                    name : "IS",
                    id : " = "
                }, {
                    name : "IS NOT",
                    id : " <> "
                }, {
                    name : "LIKE",
                    id : " LIKE "
                }, {
                    name : "NOT LIKE",
                    id : " NOT LIKE "
                }];

                var opStore = new dojo.store.Memory({
                    data : operators
                });

                var select = new dijit.form.FilteringSelect({
                    id : "operator-select-" + expNum,
                    store : opStore,
                    required : false
                }, operatorInput);

                var valueInput = dojo.create("input", {
                    id : "value-input"
                }, field.valueSpan);

                if (field.length < 50) {
                    var textBox = new dijit.form.TextBox({
                        id : "value-input-" + expNum
                    }, valueInput);
                } else {
                    var textBox = new dijit.form.Textarea({
                        id : "value-input-" + expNum
                    }, valueInput);
                }

            } else if (field.type == "esriFieldTypeDouble" || field.type == "esriFieldTypeSingle" || field.type == "esriFieldTypeInteger" || field.type == "esriFieldTypeSmallInteger") {

                var operatorInput = dojo.create("input", {
                    id : "operator-input"
                }, field.operatorSpan);

                var operators = [{
                    name : "=",
                    id : " = "
                }, {
                    name : "!=",
                    id : " <> "
                }, {
                    name : "<",
                    id : " < "
                }, {
                    name : "<=",
                    id : " <= "
                }, {
                    name : ">",
                    id : " > "
                }, {
                    name : ">=",
                    id : " >= "
                }];

                var opStore = new dojo.store.Memory({
                    data : operators
                });

                var select = new dijit.form.FilteringSelect({
                    id : "operator-select-" + expNum,
                    store : opStore,
                    required : false
                }, operatorInput);

                var valueInput = dojo.create("input", {
                    id : "value-input"
                }, field.valueSpan);

                var constraints = {};

                if ("domain" in field && "range" in field.domain) {
                    constraints.min = field.domain.range.min;
                    constraints.max = field.domain.range.max;
                }

                if (field.type == "esriFieldTypeDouble" || field.type == "esriFieldTypeSingle") {
                    constraints.places = 2;
                }

                var numberSpinner = new dijit.form.NumberSpinner({
                    id : "value-input-" + expNum
                }, valueInput);

            } else if (field.type == "esriFieldTypeDate") {

                var operatorInput = dojo.create("input", {
                    id : "operator-input"
                }, field.operatorSpan);

                var operators = [{
                    name : "IS",
                    id : " = "
                }, {
                    name : "IS NOT",
                    id : " <> "
                }, {
                    name : "Before",
                    id : " < "
                }, {
                    name : "Before or IS",
                    id : " <= "
                }, {
                    name : "After",
                    id : " > "
                }, {
                    name : "After or IS",
                    id : " >= "
                }];

                var opStore = new dojo.store.Memory({
                    data : operators
                });

                var select = new dijit.form.FilteringSelect({
                    id : "operator-select-" + expNum,
                    store : opStore,
                    required : false
                }, operatorInput);

                var valueInput = dojo.create("input", {
                    id : "value-input"
                }, field.valueSpan);

                var dateTextBox = new dijit.form.DateTextBox({
                    id : "value-input-" + expNum
                }, valueInput);

            } else {

            }
        }

        return {
            CreateDialog: function(lyr) {

                layer = lyr;

                queryDiv = dojo.create("div", {
                    id : "queryDiv"
                });

                var buttonInput = dojo.create("button", {
                    id : "button"
                }, queryDiv);

                var button = new dijit.form.Button({
                    id : "addExpression",
                    label : "Add Expression",
                    onClick : function() {
                        BuildExpression(layer);
                    }
                }, buttonInput);

                BuildExpression(layer)

                dialog = new dijit.Dialog({
                    title : "Query: ",// + layer.layerObject.name,
                    content : queryDiv,
                    style : "width: 600px"
                });

                dialog.show();
            }
        }
    }
)

然后我通过要求在一个简单的html文件中包含该模块并调用CreateDialog函数来测试它...

require(
    ["dojo/parser",
     "tb/testModule",
     "dojo/domReady!"],

    function(parser, testModule){               
        parser.parse();
        //test module
        testModule.CreateDialog({});
    }
)

• 注意：包“tb/testModule”使用tb，因为我在dojo config中就是这样设置包名的。*

如果您开始在筛选的选择框中键入内容，那么只要您在数组中的两个值中的任何一个上获得自动完成，您就应该在控制台中看到记录的等效值。
这是我得到的结果的屏幕截图，您可以看到我首先记录了value 1的id，然后记录了value 2的id...

如果你没有得到第二个事件，那它一定是在什么地方丢失了。我想知道变量作用域是否会影响一些事情，但是我没有改变任何作用域。我只是把main函数移到了模块的return块中。

只需在阵列上放置不同的id，如下所示：

var stateStore = new Memory({
        data: [
            {name:"Alabama", id:"AL"},
            {name:"Alaska", id:"AK"}
              ]
});

1.如果阵列上没有id，则不会触发onChange事件
1.如果两个id的值相同，则onChange事件将首次激发。
@Brian如果你把对象放在你的ID上，比如：

var stateStore = new Memory({
        data: [
            {name:"Alabama", id:{val:"dummy1"},
            {name:"Alaska", id:{val:"dummy2"}
              ]
});

即使这两个id对象彼此不同，该事件也不会在第二次激发，因为FilteringSelect不会按以下方式检查这两个id：

{val:"dummy1"}=={val:"dummy2"}

但它会检查为

"[object Object]"=="[object Object]" //both are same and no onChange event will be fired