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ASP.NET TextChanged無法啟動

[英]ASP.NET TextChanged won't fire

 原文  2014-10-27 21:28:19  4   1    c#/ asp.net

問題描述

我正在做的表單是用戶發送某些信息，如您所見。 但是我想創建一個事件，當用戶將文本示例寫到描述中並單擊掉某個事件時，出現示例消息“ Hello”。 我已經在文本框中添加了TextChanged函數，甚至AutoPostBack都設置為true。 我是ASP.net的新手，但是在我檢查過的每個教程中，我都只需要添加這些內容就可以完成我想做的事情。 我還注意到它在某種程度上注冊了文本更改，因為當我在Internet Explorer上調試站點並在描述中寫一些內容然后單擊鼠標離開時。 然后在IE的左下角顯示“頁面錯誤”，當我在描述中寫了一些內容后，單擊鼠標左鍵，否則顯示“完成”。 因此它正在觸發，但是無論如何我在TextChanged中放入什么代碼都不會運行它。

這是我的文件：

aspx.cs： 

using System;
using System.Collections.Generic;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.Security;
using System.Net.Mail;
using System.Net.Mime;
using System.IO;
using System.Text;


public partial class _Default : System.Web.UI.Page
{
    static readonly String attUrl = @"c:\ASDBugReport/WSASDBugReport/Attachments/";
    int attnumber = 0;
    string userEmail = "";
    string mysiteAddress = "http://company.com:xyz/mysearch=";
    string project;

    protected void Page_Load(object sender, EventArgs e)
    {
        if (Page.IsPostBack)
        {
            userEmail = User.Identity.Name.ToString();
            if (cb9.Visible == true)
            {
                attnumber++;
            }
            if (cb8.Visible == true)
            {
                attnumber++;
            }
            if (cb7.Visible == true)
            {
                attnumber++;
            }
            if (cb6.Visible == true)
            {
                attnumber++;
            }
            if (cb5.Visible == true)
            {
                attnumber++;
            }
            if (cb4.Visible == true)
            {
                attnumber++;
            }
            if (cb3.Visible == true)
            {
                attnumber++;
            }
            if (cb2.Visible == true)
            {
                attnumber++;
            }
            if (cb1.Visible == true)
            {
                attnumber++;
            }
            if (cb0.Visible == true)
            {
                attnumber++;
            }
        }
        else
        {
            ClientScript.RegisterClientScriptBlock(Page.GetType(),"Script","src='Popup.js';", true);
            ddlComponent.Items.Insert(0, new ListItem(String.Empty, String.Empty));
            ddlPriority.Items.Insert(0, new ListItem(String.Empty, String.Empty));
            ddlIssueType.Items.Insert(0, new ListItem(String.Empty, String.Empty));
        }
    }
    protected void btnSaveAttachment_Click(object sender, EventArgs e)
    {
        if (attnumber == 10)
        {
            ClientScript.RegisterClientScriptBlock(Page.GetType(), "Script", "alert('Max 10 attachments');", true);
        }
        else
        {
            if (fuIssueAttachmentUppload.FileName.Length > 0)
            {
                addAttachmentToCheckBox();
                saveAttachment();
            }
            else { }
        }
    }
    protected void saveAttachment()
    {
        if(fuIssueAttachmentUppload.HasFile)
        {
            attnumber++;
            fuIssueAttachmentUppload.SaveAs(attUrl.ToString() + fuIssueAttachmentUppload.FileName.ToString());
        }
        else{}

    }
    protected void addAttachmentToCheckBox()
    {
        if (attnumber == 0)
        {
            cb0.Visible = true;
            cb0.Text = fuIssueAttachmentUppload.FileName.ToString();
            cb0.Checked = true;
        }
        else if (attnumber == 1)
        {
            cb1.Visible = true;
            cb1.Text = fuIssueAttachmentUppload.FileName.ToString();
            cb1.Checked = true;
        }
        else if (attnumber == 2)
        {
            cb2.Visible = true;
            cb2.Text = fuIssueAttachmentUppload.FileName.ToString();
            cb2.Checked = true;
        }
        else if (attnumber == 3)
        {
            cb3.Visible = true;
            cb3.Text = fuIssueAttachmentUppload.FileName.ToString();
            cb3.Checked = true;
        }
        else if (attnumber == 4)
        {
            cb4.Visible = true;
            cb4.Text = fuIssueAttachmentUppload.FileName.ToString();
            cb4.Checked = true;
        }
        else if (attnumber == 5)
        {
            cb5.Visible = true;
            cb5.Text = fuIssueAttachmentUppload.FileName.ToString();
            cb5.Checked = true;
        }
        else if (attnumber == 6)
        {
            cb6.Visible = true;
            cb6.Text = fuIssueAttachmentUppload.FileName.ToString();
            cb6.Checked = true;
        }
        else if (attnumber == 7)
        {
            cb7.Visible = true;
            cb7.Text = fuIssueAttachmentUppload.FileName.ToString();
            cb7.Checked = true;
        }
        else if (attnumber == 8)
        {
            cb8.Visible = true;
            cb8.Text = fuIssueAttachmentUppload.FileName.ToString();
            cb8.Checked = true;
        }
        else if (attnumber == 9)
        {
            cb9.Visible = true;
            cb9.Text = fuIssueAttachmentUppload.FileName.ToString();
            cb9.Checked = true;
        }
    }
    protected void btnSend_Click(object sender, EventArgs e)
    {
        if (ComponentsValidate() == true)
        {

            SendEmail();
            EmptyForm();
            ClientScript.RegisterClientScriptBlock(Page.GetType(), "Script", "alert('Success');", true);

        }
        else {ClientScript.RegisterClientScriptBlock(Page.GetType(), "Script", "alert('All required fields not filled');", true); }
    }
    private Boolean ComponentsValidate()
    {
        rfvIssueType.Validate();
        rfvComponent.Validate();
        rfvHeader.Validate();
        rfvDescription.Validate();

        bool b = true;
        if (!rfvIssueType.IsValid)
        {
            b = false;
        }
        if (!rfvComponent.IsValid)
        {
            b = false;
        }
        if (!rfvHeader.IsValid)
        {
            b = false;
        }
        if (!rfvDescription.IsValid)
        {
            b = false;
        }
        return b;
    }
    private void EmptyForm()
    {
        txtIssueHeader.Text = "";
        txtIssueDescription.Text = "";
        cb0.Text = "";
        cb1.Text = "";
        cb2.Text = "";
        cb3.Text = "";
        cb4.Text = "";
        cb5.Text = "";
        cb6.Text = "";
        cb7.Text = "";
        cb8.Text = "";
        cb9.Text = "";
        cb0.Text = "";
        cb0.Visible = false;
        cb1.Visible = false;
        cb2.Visible = false;
        cb3.Visible = false;
        cb4.Visible = false;
        cb5.Visible = false;
        cb6.Visible = false;
        cb7.Visible = false;
        cb8.Visible = false;
        cb9.Visible = false;
        ddlComponent.ClearSelection();
        ddlIssueType.ClearSelection();
        ddlPriority.ClearSelection();
        ddlYmparisto.ClearSelection();
        txtCompany.Text = "";
    }
    private string getUserEmail(string user) { 
        int le = user.Length -8;
        user = user.Substring(8, le);
        user = user.ToLower() + "@company.com";
        return user;
    }
    private string getMysite(string user) {
        int le = user.Length - 8;
        user = user.Substring(8, le);
        string s = mysiteAddress + user.ToLower();
        return s;
    }
    public void SendEmail()
    {

        if (ddlIssueType.SelectedValue == "Bug") {
            project = "bugs";
        }
        else if (ddlIssueType.SelectedValue == "Feature Request")
        {
            project = "company";
        }
        else if (ddlIssueType.SelectedValue == "User Rights")
        {
            project = "USER";
        }
        else {
            project = "company";
        }
        MailAddress from = new MailAddress(getUserEmail(userEmail).ToString());
        MailAddress to = new MailAddress("ASD@company.com");
        MailMessage ASDMail = new MailMessage(from,to);
        ASDMail.Subject = txtIssueHeader.Text.ToString();
        ASDMail.Body = "@Ext.Creator = " + getUserEmail(userEmail).ToString() + "\n"  +
                        "@Ext.Creator.URL = " + getMysite(userEmail).ToString() + "\n" +
                        "@Environment = " + ddlYmparisto.SelectedItem.Text.ToString() + " : " + txtCompany.Text.ToString() + "\n" +
                        "@project = " + project.ToString() + "\n" +
                        "@issueType = " + ddlIssueType.SelectedItem.Value.ToString() + "\n" +
                        "@components = " + ddlComponent.SelectedItem.Text.ToString() + "\n" + "\n" +
                        txtIssueDescription.Text.ToString();
        if (attnumber > 0)
        {
            if (cb9.Text.Length > 0)
            {
                if (cb9.Checked)
                {
                    ASDMail.Attachments.Add(new Attachment(attUrl.ToString() + cb9.Text.ToString(), MediaTypeNames.Application.Octet));
                }
            }
            if (cb8.Text.Length > 0)
            {
                if (cb8.Checked)
                {
                    ASDMail.Attachments.Add(new Attachment(attUrl.ToString() + cb8.Text.ToString(), MediaTypeNames.Application.Octet));
                }
            }
            if (cb7.Text.Length > 0)
            {
                if (cb7.Checked)
                {
                    ASDMail.Attachments.Add(new Attachment(attUrl.ToString() + cb7.Text.ToString(), MediaTypeNames.Application.Octet));
                }
            }
            if (cb6.Text.Length > 0)
            {
                if (cb6.Checked)
                {
                    ASDMail.Attachments.Add(new Attachment(attUrl.ToString() + cb6.Text.ToString(), MediaTypeNames.Application.Octet));
                }
            }
            if (cb5.Text.Length > 0)
            {
                if (cb5.Checked)
                {
                    ASDMail.Attachments.Add(new Attachment(attUrl.ToString() + cb5.Text.ToString(), MediaTypeNames.Application.Octet));
                }
            }
            if (cb4.Text.Length > 0)
            {
                if (cb4.Checked)
                {
                    ASDMail.Attachments.Add(new Attachment(attUrl.ToString() + cb4.Text.ToString(), MediaTypeNames.Application.Octet));
                }
            }
            if (cb3.Text.Length > 0)
            {
                if (cb3.Checked)
                {
                    ASDMail.Attachments.Add(new Attachment(attUrl.ToString() + cb3.Text.ToString(), MediaTypeNames.Application.Octet));
                }
            }
            if (cb2.Text.Length > 0)
            {
                if (cb2.Checked)
                {
                    ASDMail.Attachments.Add(new Attachment(attUrl.ToString() + cb2.Text.ToString(), MediaTypeNames.Application.Octet));
                }
            }
            if (cb1.Text.Length > 0)
            {
                if (cb1.Checked)
                {
                    ASDMail.Attachments.Add(new Attachment(attUrl.ToString() + cb1.Text.ToString(), MediaTypeNames.Application.Octet));
                }
            }
            if (cb0.Text.Length > 0)
            {
                if (cb0.Checked)
                {
                    ASDMail.Attachments.Add(new Attachment(attUrl.ToString() + cb0.Text.ToString(), MediaTypeNames.Application.Octet));
                }
            }
        }
        SmtpClient client = new SmtpClient();
        client.Send(ASDMail);
        if (DeleteAttachments()) { 

        }
    }
    private Boolean DeleteAttachments() {
        bool r = true;
        if (attnumber == 1)
        {
            try
            {
                FileInfo TheFile = new FileInfo(MapPath(cb0.Text.ToString()));
                if (TheFile.Exists)
                {
                    try {File.Delete(cb0.Text.ToString());}
                    catch
                    {
                    }
                }
                else
                {
                    r = false;
                    throw new FileNotFoundException();
                }
            }
            catch (FileNotFoundException ex)
            {
            }
            catch (Exception ex)
            {
            }
        }
        else if (attnumber == 2)
        {
            try
            {
                FileInfo TheFile = new FileInfo(cb1.Text.ToString());
                if (TheFile.Exists)
                {
                    try { File.Delete(cb1.Text.ToString()); }
                    catch
                    {
                    }
                }
                else
                {
                    r = false;
                    throw new FileNotFoundException();
                }
            }

            catch (FileNotFoundException ex)
            {
            }
            catch (Exception ex)
            {
            }
        }
        else if (attnumber == 3)
        {
            try
            {
                FileInfo TheFile = new FileInfo(cb2.Text.ToString());
                if (TheFile.Exists)
                {
                    try { File.Delete(cb2.Text.ToString()); }
                    catch
                    {
                    }
                }
                else
                {
                    r = false;
                    throw new FileNotFoundException();
                }
            }
            catch (FileNotFoundException ex)
            {
            }
            catch (Exception ex)
            {
            }

        }
        else if (attnumber == 4)
        {
            try
            {
                FileInfo TheFile = new FileInfo(cb3.Text.ToString());
                if (TheFile.Exists)
                {
                    try { File.Delete(cb3.Text.ToString()); }
                    catch
                    {
                    }
                }
                else
                {
                    r = false;
                    throw new FileNotFoundException();
                }
            }

            catch (FileNotFoundException ex)
            {
            }
            catch (Exception ex)
            {
            }
        }

        return r;
    }
    private void HideCheckBox() {
        if (attnumber == 0) {
            cb0.Visible = false;
        }
        if (attnumber == 1) {
            cb1.Visible = false;
        }
        if (attnumber == 2) {
            cb2.Visible = false;
        }
        if (attnumber == 3) {
            cb3.Visible = false;
        }
        if (attnumber == 4) {
            cb4.Visible = false;
        }
        if (attnumber == 5) {
            cb5.Visible = false;
        }
        if (attnumber == 6) {
            cb6.Visible = false;
        }
        if (attnumber == 7) {
            cb7.Visible = false;
        }
        if (attnumber == 8) {
            cb8.Visible = false;
        }
    }
    protected void cb0_CheckedChanged(object sender, EventArgs e)
    {
        if (!cb0.Checked)
        {
            attnumber = attnumber - 1;
            cb0.Visible = false;
            cb0.Text = cb1.Text.ToString();
            cb1.Text = cb2.Text.ToString();
            cb2.Text = cb3.Text.ToString();
            cb3.Text = cb4.Text.ToString();
            cb4.Text = cb5.Text.ToString();
            cb5.Text = cb6.Text.ToString();
            cb6.Text = cb7.Text.ToString();
            cb7.Text = cb8.Text.ToString();
            cb8.Text = cb9.Text.ToString();
            if (attnumber >= 1) {
                cb0.Visible = true;
                cb0.Checked = true;
            }
            HideCheckBox();
        }
    }
    protected void cb1_CheckedChanged(object sender, EventArgs e)
    {
        if (!cb1.Checked)
        {
            attnumber = attnumber - 1;
            cb1.Visible = false;
            cb1.Text = cb2.Text.ToString();
            cb2.Text = cb3.Text.ToString();
            cb3.Text = cb4.Text.ToString();
            cb4.Text = cb5.Text.ToString();
            cb5.Text = cb6.Text.ToString();
            cb6.Text = cb7.Text.ToString();
            cb7.Text = cb8.Text.ToString();
            cb8.Text = cb9.Text.ToString();
            if (attnumber >= 2)
            {
                cb1.Visible = true;
                cb1.Checked = true;
            }
            HideCheckBox();
        }
    }
    protected void cb2_CheckedChanged(object sender, EventArgs e)
    {
        if (!cb2.Checked)
        {
            attnumber = attnumber - 1;
            cb2.Visible = false;
            cb2.Text = cb3.Text.ToString();
            cb3.Text = cb4.Text.ToString();
            cb4.Text = cb5.Text.ToString();
            cb5.Text = cb6.Text.ToString();
            cb6.Text = cb7.Text.ToString();
            cb7.Text = cb8.Text.ToString();
            cb8.Text = cb9.Text.ToString();
            if (attnumber >= 3)
            {
                cb2.Visible = true;
                cb2.Checked = true;
            }
            HideCheckBox();
        }
    }
}

ASPX： 

<%@ Page Title="Home Page" Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true"
    CodeFile="Default.aspx.cs" Inherits="_Default" Theme="SkinStyleOfASDForm" %>

<asp:Content ID="HeaderContent" runat="server" ContentPlaceHolderID="HeadContent">
</asp:Content>
<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">
    <div id="divHeader">
    <asp:Label ID="lblHeader" runat="server" 
            Text="IT stuff" Font-Bold="True" 
            Font-Size="Large"></asp:Label>
</div><br />
<div id="divContent">
    <div id="divIssueHeader">
        <asp:Label ID="lblIssueHeader" runat="server" Text="Header:"></asp:Label><br />
        <asp:TextBox ID="txtIssueHeader" runat="server" Width="394px" 
            CausesValidation="True" 
            ToolTip="Write header"></asp:TextBox>
        <asp:RequiredFieldValidator ID="rfvHeader" runat="server" 
            ControlToValidate="txtIssueHeader" ErrorMessage="fill missing info" 
            ForeColor="Red"></asp:RequiredFieldValidator>
    </div><br />
    <div id="divIssueType" 
        style="height: 70px;">
    <asp:Label ID="lbIssueType" runat="server" Text="type: "></asp:Label><br />
        <asp:DropDownList ID="ddlIssueType" runat="server" DataValueField="ID" 
                SkinID="ddListSkinId" AppendDataBoundItems="True" 
            CausesValidation="True" 
            ToolTip="give type">
            <asp:ListItem Value="Bug">bug</asp:ListItem>
            <asp:ListItem Value="Feature Request">Feature</asp:ListItem>
            <asp:ListItem Value="User Rights">User</asp:ListItem>
            </asp:DropDownList>
            <asp:RequiredFieldValidator ID="rfvIssueType" runat="server" 
                ControlToValidate="ddlIssueType" ErrorMessage="fill missing info" 
                ForeColor="Red"></asp:RequiredFieldValidator>
    </div>
    <div id="divIssueComponent" 
    style="height: 70px;">
    <asp:Label ID="lbIssueComponent" runat="server" Text="system: "></asp:Label><br />
                <asp:DropDownList ID="ddlComponent" runat="server" 
            DataSourceID="dsComponents" DataTextField="cname" DataValueField="ComponentID" 
                    SkinID="ddListSkinId" AppendDataBoundItems="True" 
            CausesValidation="True" ToolTip="choose system">
            </asp:DropDownList>
                <asp:RequiredFieldValidator ID="rfvComponent" runat="server" 
                    ControlToValidate="ddlComponent" ErrorMessage="fill missing info" 
                    ForeColor="Red"></asp:RequiredFieldValidator>
        <asp:SqlDataSource ID="dsComponents" runat="server" 
            ConnectionString="<%$ ConnectionStrings:ASDdbConnectionString %>"          

            SelectCommand="SELECT ID AS ComponentID, cname, PROJECT FROM ASDschema.component WHERE (PROJECT = '9999')">
        </asp:SqlDataSource>
    </div>
    <div id="divIssueAssignee" style="height: 70px;">
        <asp:Label ID="lblenvi" runat="server" Text="envi:"></asp:Label>
        <br />
        <asp:DropDownList ID="ddlYmparisto" runat="server" AppendDataBoundItems="True" 
            ToolTip="choose envi">
            <asp:ListItem Selected="True">basic</asp:ListItem>
            <asp:ListItem>test</asp:ListItem>
        </asp:DropDownList>
        <br />
        <asp:Label ID="lblcompany" runat="server" Text="envi "></asp:Label>
        <br />
        <asp:TextBox ID="txtcompany" runat="server"></asp:TextBox>
    </div>
    <br />
    <div id="divIssueDescription">
        <asp:Label ID="lblIssueDescription" runat="server" Text="desc "></asp:Label>
            <asp:RequiredFieldValidator ID="rfvDescription" runat="server" 
            ControlToValidate="txtIssueDescription" ErrorMessage="fill missing info" 
            ForeColor="Red"></asp:RequiredFieldValidator>
            <br />
        <asp:TextBox ID="txtIssueDescription" runat="server" Height="345px" 
            TextMode="MultiLine" Width="586px" CausesValidation="True" 
            EnableTheming="True" style="margin-right: 0px"></asp:TextBox>
            </div><br />
    <div id="divIssueAttachment">
        <asp:Label ID="lblIssueAttachment" runat="server" Text="attach file "></asp:Label><br />
        <asp:FileUpload ID="fuIssueAttachmentUppload" runat="server" Width="218px" 
            EnableViewState="False" ViewStateMode="Disabled" /><br />
        <asp:Button ID="btnSaveAttachment" runat="server" Text="attach" 
            onclick="btnSaveAttachment_Click" Width="69px" CausesValidation="False" /><br />
            <asp:CheckBox ID = "cb0" runat="server" visible= "false" 
            AutoPostBack="True" oncheckedchanged="cb0_CheckedChanged"></asp:CheckBox><br />
                        <asp:CheckBox ID = "cb1" runat="server" visible= "false" 
            ViewStateMode="Enabled" AutoPostBack="True" 
            oncheckedchanged="cb1_CheckedChanged">
            </asp:CheckBox><br />
                        <asp:CheckBox ID = "cb2" runat="server" Visible="false" 
            AutoPostBack="True" oncheckedchanged="cb2_CheckedChanged">
            </asp:CheckBox><br />
                        <asp:CheckBox ID = "cb3" runat="server" visible= "false" 
            AutoPostBack="True" oncheckedchanged="cb3_CheckedChanged">
            </asp:CheckBox><br />
                        <asp:CheckBox ID = "cb4" runat="server" visible= "false" 
            AutoPostBack="True" oncheckedchanged="cb4_CheckedChanged">
            </asp:CheckBox><br />
                        <asp:CheckBox ID = "cb5" runat="server" visible= "false" 
            AutoPostBack="True" oncheckedchanged="cb5_CheckedChanged">
            </asp:CheckBox><br />
                        <asp:CheckBox ID = "cb6" runat="server" visible= "false" 
            AutoPostBack="True" oncheckedchanged="cb6_CheckedChanged">
            </asp:CheckBox><br />
                        <asp:CheckBox ID = "cb7" runat="server" visible= "false" 
            AutoPostBack="True" oncheckedchanged="cb7_CheckedChanged">
            </asp:CheckBox><br />
                        <asp:CheckBox ID = "cb8" runat="server" visible= "false" 
            AutoPostBack="True" oncheckedchanged="cb8_CheckedChanged">
            </asp:CheckBox><br />
                        <asp:CheckBox ID = "cb9" runat="server" visible= "false" 
            AutoPostBack="True" oncheckedchanged="cb9_CheckedChanged">
            </asp:CheckBox><br />
    </div>
    <div id="divSend">
        <asp:Button ID="btnSend" runat="server" Text="send" onclick="btnSend_Click" 
            Height="28px" Width="290px" CausesValidation="False"/>
    </div>
</div>
</asp:Content>

1 個解決方案

解決方案1
 1  2014-10-27 21:42:44

字段中的數據更改時，請勿使用自動回發 。

  • 回發 -應該放在字典中，以免給用戶帶來痛苦，丑陋和傷害。 尤其是當被濫用時。

  • 更新面板 -為避免可愛的屏幕閃爍，您將最終實現一個更新面板 ，這會使您的頁面很大一部分難以使用。 還會消耗過多的內存，因為它將占用您的頁面並提交到內存。 然后刷新新的更改，並將它們都保存在內存中。

我假設您嘗試驗證用戶輸入。 您可以使用多個庫（例如Valid8） ，也可以自己使用Javascript編寫簡單的驗證。 這種方法將減輕回發，因為客戶端將具有驗證。

例： 

$(document).ready(function () {
     if($("#<%= txtFirstName.ClientId %>").val() == '') {
          $(this).css({ border: "Red" });
     }
});

很簡單，如果該字段為null則將邊框設為紅色。 這將提供無需回發的功能，只需確保您使用OnClientClick並創建一個功能即可。 同樣，盡管大部分工作將在客戶端完成，但您應該檢查服務器上的數據。 只是為了確保它未被篡改。

希望這可以解釋為什么您應該避免過多的回發方法，而這種方法將要實施。

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