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我正在尝试在我的 asp.net 3.5 webforms 应用程序中使用 jqueryUI 组合框。我添加了一个下拉列表并使用 jquery 修改了它的样式。我遇到的问题是，当我尝试执行回发时，下拉菜单通常会在它选择的项目被更改时执行。组合框不会更改它的值，并且我收到错误消息，即 _dopostback 未在我的 firebug 错误控制台中定义。我一直在这里以及在 asp.net 论坛中阅读有关此内容的内容，并找到了一些答案，告诉我应该尝试 GetPostBackEventReference 方法，但仍然没有发生任何事情。下面是代码，谢谢。

<script type="text/javascript">
    (function ($) {
        $.widget("ui.combobox", {
            _create: function () {
                var input,
                self = this,
                select = this.element.hide(),
                selected = select.children(":selected"),
                value = selected.val() ? selected.text() : "",
                wrapper = $("<span>")
                    .addClass("ui-combobox")
                    .insertAfter(select);

                input = $("<input>")
                .appendTo(wrapper)
                .val(value)
                .addClass("ui-state-default")
                .autocomplete({
                    delay: 0,
                    minLength: 0,
                    source: function (request, response) {
                        var matcher = new RegExp($.ui.autocomplete.escapeRegex(request.term), "i");
                        response(select.children("option").map(function () {
                            var text = $(this).text();
                            if (this.value && (!request.term || matcher.test(text)))
                                return {
                                    label: text.replace(
                                        new RegExp(
                                            "(?![^&;]+;)(?!<[^<>]*)(" +
                                            $.ui.autocomplete.escapeRegex(request.term) +
                                            ")(?![^<>]*>)(?![^&;]+;)", "gi"
                                        ), "<strong>$1</strong>"),
                                    value: text,
                                    option: this
                                };
                        }));
                    },
                    select: function (event, ui) {
                        ui.item.option.selected = true;
                        self._trigger("selected", event, {
                            item: ui.item.option
                        });
                        _doPostBack('<%= ddlModalities.UniqueID %>', "");
                    },
                    change: function (event, ui) {
                        if (!ui.item) {
                            var matcher = new RegExp("^" + $.ui.autocomplete.escapeRegex($(this).val()) + "$", "i"),
                                valid = false;
                            select.children("option").each(function () {
                                if ($(this).text().match(matcher)) {
                                    this.selected = valid = true;
                                    $(select).change();

                                    return false;
                                }
                            });
                            if (!valid) {
                                // remove invalid value, as it didn't match anything
                                $(this).val("");
                                select.val("");
                                input.data("autocomplete").term = "";
                                return false;
                            }
                        }
                    }
                })
                .addClass("ui-widget ui-widget-content ui-corner-left");

                input.data("autocomplete")._renderItem = function (ul, item) {
                    return $("<li></li>")
                    .data("item.autocomplete", item)
                    .append("<a>" + item.label + "</a>")
                    .appendTo(ul);
                };

                $("<a>")
                .attr("tabIndex", -1)
                .attr("title", "Show All Items")
                .appendTo(wrapper)
                .button({
                    icons: {
                        primary: "ui-icon-triangle-1-s"
                    },
                    text: false
                })
                .removeClass("ui-corner-all")
                .addClass("ui-corner-right ui-button-icon")
                .click(function () {
                    // close if already visible
                    if (input.autocomplete("widget").is(":visible")) {
                        input.autocomplete("close");
                        return;
                    }

                    // work around a bug (likely same cause as #5265)
                    $(this).blur();

                    // pass empty string as value to search for, displaying all results
                    input.autocomplete("search", "");
                    input.focus();
                });
            },

            destroy: function () {
                this.wrapper.remove();
                this.element.show();
                $.Widget.prototype.destroy.call(this);
            }
        });
    })(jQuery);

    $(function () {
        $("#<%=ddlModalities.ClientID %>").combobox();
    });
</script>

<div class="ui-widget">
    <asp:DropDownList runat="server" ID="ddlModalities" Width="150px" AutoPostBack="True"
                                DataSourceID="odsModalitiesNoWorklist" DataTextField="Ae" DataValueField="Id"
                                CssClass="ddlStandardWidth" OnDataBound="ddlModalities_DataBound" OnSelectedIndexChanged="ddlModalities_SelectedIndexChanged" />
                        </div>
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1 回答 1

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看起来你正在调用“ _doPostBack”。但是，ASP.NET 生成的函数是“ __doPostBack”——开头有两个“_”字符，而不仅仅是一个。这可能是您的“功能未定义”错误的原因。

于 2012-06-04T15:42:44.363 回答