当第二次修改等于原始值时，TextChanged事件不会触发

时间：2012-06-05 17:20:32

标签： c# asp.net .net user-controls viewstate

我有一个_TextChanged事件可以正常工作，除非在特定情况下可以复制如下：

  1. 用户修改文本（事件正确触发）
  2. 用户再次修改文本以匹配原始值（事件不会触发）

    3. 我可以通过打开ascx页面上的更新面板的Viewstate来使_TextChanged事件在我的开发框上工作，但是当我将它移动到服务器时，如果我切换用户控件，我会收到viewstate失败的错误然后切换回该页面。进入更新面板的控件是在代码后面动态构建的，并且每次回发都会重建 - 这适用于所有其他回发，因此我认为问题不在于控件。

    此外，启用viewstate会使页面运行速度极慢，因此这不是一个理想的修复方法。

    最后，当回复到原始值时，_TextChanged事件适用于除之外的所有更改。

    有人能告诉我为什么事件不会在特定情况下发生，以及如何解决这个问题？

    在代码背后创建文本框：

     TextBox annualHoursTextBox = new TextBox();
 annualHoursTextBox.ID = string.Format("bundle{0}_annualHoursTextBox{1}", bundle.BundleNbr, parentItem.LaborItemNbr);
 annualHoursTextBox.CssClass = "";
 annualHoursTextBox.Columns = 4;
 annualHoursTextBox.Text = childItem == null ? string.Empty : childItem.FTEHours.ToString("F0");
 annualHoursTextBox.AutoPostBack = true;
 annualHoursTextBox.TextChanged += new EventHandler(annualHoursTextBox_TextChanged);

 AsyncPostBackTrigger AHtrigger = new AsyncPostBackTrigger();
 AHtrigger.ControlID = annualHoursTextBox.UniqueID;
 AHtrigger.EventName = "TextChanged";
 upPricingSheet.Triggers.Add(AHtrigger);

 //snip

 //add some attributes for reference on the events
 annualHoursTextBox.Attributes["othercontrol"] = tasksPerYearTextBox.UniqueID;
 annualHoursTextBox.Attributes["nextcontrol"] = benefitsTextBox.UniqueID;
 annualHoursTextBox.Attributes["targetTBcontrol"] = taskTimeTextBox.UniqueID;
 annualHoursTextBox.Attributes["targetDDLcontrol"] = taskTimeUOMDropDown.UniqueID;

    事件处理程序：

    protected void annualHoursTextBox_TextChanged(object sender, EventArgs e)
{
    TextBox ah = sender as TextBox;
    TextBox other = Page.FindControl(ah.Attributes["othercontrol"]) as TextBox;

    if ((!String.IsNullOrEmpty(ah.Text)) && (!String.IsNullOrEmpty(other.Text))) 
    {
        TextBox next = Page.FindControl(ah.Attributes["nextcontrol"]) as TextBox;
        TextBox targetTB = Page.FindControl(ah.Attributes["targetTBcontrol"]) as TextBox;
        DropDownList ddl = Page.FindControl(ah.Attributes["targetDDLcontrol"]) as DropDownList;
        Double TasksPerSecond;

        TasksPerSecond = CalculateTimePerTask(ah.Text, other.Text);
        string TimeUnit;
        double Time;

        if (TasksPerSecond < 60)
        {
            TimeUnit = "Seconds";
            Time = TasksPerSecond;
        }
        else if (TasksPerSecond < 3600)
        {
            TimeUnit = "Minutes";
            Time = (TasksPerSecond / 60);
        }
        else
        {
            TimeUnit = "Hours";
            Time = (TasksPerSecond / 60 / 60);
        }

        //Enter the time in the appropriate textbox
        targetTB.Text = Time.ToString("F2");

        //select the appropriate item from the ddl
        ListItem i = ddl.Items.FindByText(TimeUnit);

        if (i != null)
        {
            ddl.SelectedItem.Selected = false;
            i.Selected = true;
        }
    }
}

    ASPX页面：

    <%@ Page Title="" Language="C#" MasterPageFile="~/MasterPage.master"
AutoEventWireup="true" CodeFile="Solution.aspx.cs" Inherits="Solution" %>

<%@ Register Src="fragments/solutionRecommended.ascx" TagName="solutionRecommended"
TagPrefix="uc1" %>
<%@ Register Src="fragments/solutionPricingSheet.ascx" TagName="solutionPricingSheet"
TagPrefix="uc2" %>
<%@ Register Src="fragments/solutionSuggested.ascx" TagName="solutionSuggested" TagPrefix="uc3" %>
<%@ Register Src="fragments/solutionSummary.ascx" TagName="solutionSummary" TagPrefix="uc4" %>
<%@ Register Src="fragments/ucItemFilterSearch.ascx" TagName="ucItemFilterSearch"
TagPrefix="uc5" %>

<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="Server">
<script type="text/javascript">
    function addItemToBundle(postUrl, redirectUrl) {
        $.post(postUrl);
        window.location = redirectUrl;
        //  window.location = url;
    }

</script>
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="Server">
<asp:HiddenField ID="hfStepNbr" runat="server" />
<asp:Panel ID="pnlStepMessage" runat="server" Visible="false" CssClass="padding10">
    <h3 class="placeholder">
        <asp:Label ID="lblMessage" runat="server" /></h3>
</asp:Panel>
<div class='elev8form' id="mainDiv" runat="server">
    <h3 class='header'>
        Solutions</h3>
    <div id="tabs">
        <div class='tab'>
            <asp:LinkButton ID="lbSuggested" runat="server" Text="Select Items" data-step="1"
                OnClick="lbTab_Click" CausesValidation="false"></asp:LinkButton>
        </div>
        <div class='tab'>
            <asp:LinkButton ID="lbPricing" runat="server" Text="Pricing Worksheet" data-step="2"
                OnClick="lbTab_Click" ></asp:LinkButton>
        </div>
        <div class='tab'>
            <asp:LinkButton ID="lbRecommendedSolutions" runat="server" Text="Recommended Solutions"
                data-step="3" OnClick="lbTab_Click" CausesValidation="false"></asp:LinkButton>
        </div>
        <div class='tab'>
            <asp:LinkButton ID="lbSummary" runat="server" Text="Solutions Summary" data-step="4"
                OnClick="lbTab_Click" CausesValidation="false"></asp:LinkButton>
        </div>
    </div>
    <div id="solutions-body">
        <asp:MultiView ID="mltSolution" runat="server">
            <asp:View ID="viewSuggested" runat="server">
                <uc3:solutionSuggested ID="solutionSuggested1" runat="server" RedirectUrl="~/portal/elev8/solution.aspx" />
            </asp:View>
            <asp:View ID="viewPricing" runat="server">
                <uc2:solutionPricingSheet ID="solutionPricingSheet1" runat="server" />
            </asp:View>
            <asp:View ID="viewRecommended" runat="server">
                <uc1:solutionRecommended ID="solutionRecommended1" runat="server" />
            </asp:View>
            <asp:View ID="viewSummary" runat="server">
                <p style="font-size: 14px;">
                    Text here 
                </p>
                <uc4:solutionSummary ID="solutionSummary1" runat="server" />
            </asp:View>
        </asp:MultiView>
    </div>
</div>
<script type="text/javascript">
    function pageLoad() {
        $(function () {

            var maxChannelHeight;

            var items = $('.channel');

            for (var counter = 0; counter < items.length; counter++) {
                var channel = items[counter];

                var channelHeight = $(channel).height();

                maxChannelHeight = maxChannelHeight > channelHeight ? maxChannelHeight : channelHeight;
            }

            $('.channel').height(maxChannelHeight);

            $("#priceing-sheet-save-button *").click(function () {
                window.scrollTo(0, 0);

            });
        });
    }

</script>

    ASCX页面：

    <%@ Control Language="C#" AutoEventWireup="true" CodeFile="solutionPricingSheet.ascx.cs"
Inherits="solutionPricingSheet" %>

<asp:UpdateProgress ID="upProgressRecSolution" runat='server' AssociatedUpdatePanelID="upPricingSheet">
<ProgressTemplate>
    <div style="position: absolute; z-index: 2000; left: 45%; display: inline; width: 100px;"
        class="elev8form">
        <asp:Image ID="Image1" runat='server' ImageUrl="~/portal/img/ajax-loader-big.gif" />
    </div>
</ProgressTemplate>
</asp:UpdateProgress>
<div id="pricing-sheet-wrapper">
<p class='left'>
    More text</p>
<asp:Panel ID="pnlSaveMessage" runat="server" Visible="false" CssClass="save-message">
    <span>Item prices saved</span>
</asp:Panel>
<div class='export'>
    <span class='bigbutton'>
        <asp:LinkButton ID="btnExport" runat='server' Text="Export to Excel" OnClick="btnExport_Click" />
    </span>
</div>
<asp:UpdatePanel ID="upPricingSheet" runat="server" UpdateMode="Conditional" ViewStateMode="Disabled">
    <ContentTemplate>
        <div id="pricing-sheet">        
            <asp:PlaceHolder ID="phContent" runat="server"></asp:PlaceHolder>
            <asp:PlaceHolder ID="opportunityPlaceHolder" runat="server" />
            <div class='save export'>
                <div>
                    <div id="pageValidationError" class="validationMessage">
                       * Changes not saved. Review all entries for validation messages. Required fields marked with an asterisk.
                    </div>
                </div>
                <%--<asp:HiddenField ID="hf" runat="server" value="0" />--%>
                <center>
                    <span id="priceing-sheet-save-button">
                    <asp:Button ID="btnSave" runat="server" Text="Save All Prices" SkinID="redbutton"
                        OnClick="btnSave_Click" CausesValidation="true" />
                    </span>
                </center>
            </div>
        </div>
        <script type="text/javascript">
            function pageLoad() {

                $("#tabs .tab a").click(function () {
                    $("#<%= btnSave.ClientID%>").click();
                });
            }
        </script>
    </ContentTemplate>
</asp:UpdatePanel>
</div>
    <script type="text/javascript">
$(document).ready(function () {
    $('.validationMessage').hide();

    $('#<%= btnSave.ClientID %>').click(function () {
        if (Page_IsValid == false) {
            $('.validationMessage').show();
            return false;
        }
    });

    $('input[type=text]').blur(function () {
        if (Page_IsValid == false) {
            $('.validationMessage').show();
            return false;
        }
        else {
            $('.validationMessage').hide();
        }
    })
});

1 个答案:

答案 0 :(得分：1)

这是预期的行为 - 事件被称为OnTextChanged（与原始版本不同）而不是OnTextTyped（输入的任何文本），因为您必须处理此事件（即使没有，也会触发）完全进入）：

OnBlur="__doPostBack(this.id, '');"

更新：实际上非常简单，因为你使用的是ajax，你的文本框.defaultValue在回发之间没有变化，只有.value是 - 所以要么使用{{ 1}}正如我告诉你的那样，或者每次回发都会在javascript中将OnBlur更改为.defaultValue：http://www.w3schools.com/jsref/prop_text_defaultvalue.asp

或者只是将文本框放在.value中，它会自行处理...

更新2：首先，您的代码中没有任何地方显示的文本框位于“UpdatePanel”内，其次，您有3个选择：

a）要使UpdatePanel方法起作用，请删除OnBlur属性（它是客户端AutoPostBack事件），但保留OnChange事件（它是服务器端） ）。

b）要使OnTextChanged方法有效，请在文本框中设置ViewState，并确保在其容器上使用ViewStateMode="Enabled"，而不是ViewStateMode="Disabled"。

c）javascript EnableViewState="False"方法......

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