Having looked around at pages such as this, I cannot see why a label text will not display in a simple test page when a submit button is clicked. As the file is short, I have included all coding, in case there is anything I have not thought of in the background.
The text does not display when the button is pressed in a render generated with Ctrl+F5 in Visual Studio Express 2015. Where have I gone wrong?
Code:
<%# Page Language="C#" AutoEventWireup="true" CodeFile="labelTest2.aspx.cs"
Inherits="contact_labelTest2" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Label Test</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Button ID="Button1" runat="server" Text="Send"/>
<asp:Label ID="lblMessage" runat="server" Visible="false">
Test M AFTERessage</asp:Label>
</div>
</form>
</body>
</html>
Code behind:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class contact_labelTest2 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
lblMessage.Visible = true;
}
}
You should also add OnClick event to the Button. Like this:
<asp:Button ID="Button1" runat="server" Text="Send" OnClick="Button1_Click"/>
Related
I have a web site in windows host = https://blobloblo/WebForm5.aspx
When run that link on FireFox developer & take a look at Console logs,
I will see this error :
Error: ASP.NET Ajax client-side framework failed to
Because of this error many parts of this web site do n't work correctly.
Yesterdays every thing was ok.
But today they closed the host for some hours & did some updates such as plesk's update.
After running the host again this error appeared.
What should i tell them to fix this problem?
WebForm5 ASPX :
<%# Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm5.aspx.cs" Inherits="Virtual_Visa_Cards.WebForm5" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:Button ID="Button1" runat="server" Text="Button" Height="26px" OnClick="Button1_Click" /> <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
</ContentTemplate>
</asp:UpdatePanel>
</div>
</form>
</body>
</html>
WebForm5 C# :
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace Virtual_Visa_Cards
{
public partial class WebForm5 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
Label1.Text = "This is Ajax Call = CallBack";
}
}
}
Related Topic :
ASP.NET Ajax client-side framework failed to load. when put the ScriptManager on a blank page
I test all answers in the topic upper WITH NO RESULT.
In plesk i went to Web Application Firewall & put Web application firewall mode to off.
I worked one day to solve this issue.
first let me say that even though I am 60 years of age I am relatively new to c# and definitely new to asp.net.
I was doing a simple demo that I copied from the web, where I have a very minimal web form that only has a text box and a button. The code compiles and when run the web form it comes up and shows the proper button and text box. However, when I click the button, I should get an event to happen which does not happen. In fact, when I am debugging, I see that the program never executes to the event that increments the button click count. Of course, I am clicking the button during debug mode and I never see the click increment function executed.
Evidently the event of the button click is not being executed.
I have included a picture of the simple web form (hopefully, it will come through)
Thank You
Tom
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace ViewStateDemo
{
public partial class WebForm1 : System.Web.UI.Page
{
int ClicksCount = 0;
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
TextBox1.Text = "0";
}
}
protected void Button1_Click(object sender, EventArgs e)
{
ClicksCount = ClicksCount + 1;
TextBox1.Text = ClicksCount.ToString();
}
}
}
Simple Web Form
<%# Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="ViewStateDemo.WebForm1" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<asp:Button ID="Button1" runat="server" Text="Button" />
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
</form>
</body>
</html>
You didn't wire up your event. You have to tell the button what method to call when it's clicked.
<asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" />
By the way, you're learning ASP.NET Web Forms. Web Forms future is unclear, and bleak, and it's considered by many professionals to not be that great. If you're just starting out, you should learn ASP.NET MVC.
I'm new to ASP and C# and need some advice on C# code blocks inside ASPX. I have tried changing label text depend on checkbox value.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<%# Page Language="C#" %>
<html>
<body>
<form id="form1" runat="server">
<asp:CheckBox runat="server" id="CheckBox1" AutoPostBack="True" Checked="True"></asp:CheckBox>
<% if (CheckBox1.Checked==True) {%>
<asp:Label id="Label1" runat="server" Text="Checked"></asp:Label>
<% } else {%>
<asp:Label id="Label1" runat="server" Text="Not Checked"></asp:Label>
<% }%>
</form>
</body>
</html>
It is not working and i not sure if this is right way of doing this.
It would be better to separate your markup and code into 2 different files (eg Default.aspx & Default.aspx.cs ).
To change label text try to handle page's load event.
Default.aspx:
<%# Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<body>
<form id="form1" runat="server">
<asp:CheckBox runat="server" id="CheckBox1" AutoPostBack="True" Checked="True"></asp:CheckBox>
<asp:Label id="Label1" runat="server"></asp:Label>
</form>
</body>
</html>
Default.aspx.cs:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class _Default : System.Web.UI.Page {
protected void Page_Load(object sender, EventArgs e) {
Label1.Text = CheckBox1.Checked ? "Checked" : "Not checked";
}
}
This is because true is spelled with lowercase only.
your code works fine, im assuming you are not using an IDE because it would have told you that True is not defined. you have to change it to true
<% if (CheckBox1.Checked==true) {%>
Firstly, you will have to use javascript or jquery for the.. since aspx is a server side language, it will have no control on the web page once it loads.
I am using Tinymce in my web page and in client side every thing works fine. But when I try to access the tinymce textbox in code behind the page control doesnot render. I mean Page load Didn't Render. Here is my HTML Code
<%# Page Language="C#" AutoEventWireup="true" CodeBehind="RichText.aspx.cs" Inherits="TESTING.RichText"
ValidateRequest="true" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Rich Text</title>
<script src="<%=ResolveClientUrl("~/Script/jquery-ui-1.7.1.custom.min.js") %>" type="text/javascript"></script>
<script type="text/javascript" src="Scirpt/tinymce/jscripts/tiny_mce/tiny_mce.js"> </script>
<script type="text/javascript" src="Scirpt/tinymce/jscripts/tiny_mce/InitializeRichTextBox.js"> </script>
</head>
<body>
<form id="form1" runat="server">
<div style="width: 400px">
<div style="height: 100px; width: 100%;">
</div>
<asp:TextBox ID="TextBox1" runat="server" TextMode="multiline" CssClass="RichTextBox"
Width="150px"></asp:TextBox>
</div>
<asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" />
</form>
</body>
</html>
Here is my Code Behind code
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace TESTING
{
public partial class RichText : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
string here = TextBox1.Text;
}
}
}
When i leave empty text then Page Load renders and when I write something and click on Button then this error occurs A potentially dangerous Request.Form value was detected from the client (TextBox1="<ul><li><em><span ..."). I tried to find the solution in internet but unable to find the solution. Please help me out to find the solution.
Add this in Web.config
<configuration>
<system.web>
<compilation debug="true" targetFramework="4.0"/>
<httpRuntime requestValidationMode="2.0"/>
</system.web>
</configuration>
and add ValidateRequest = "false" in Page directive like this
<%# Page Language="C#" AutoEventWireup="true"
CodeFile="Default.aspx.cs" Inherits="_Default" ValidateRequest="false" %>
for your reference click here
My page contains a user control and inherits a master page. Both have a button. I have put it in a form tag. I am just trying to do an event bubbling from master page as well as user control. Now it doesn't load because of multiple form tags error. How to do it?
Masterpage :
<%# Master Language="C#" AutoEventWireup="True" CodeBehind="SampleSite.master.cs" Inherits="EventBubbling.SampleSite" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title></title>
<asp:ContentPlaceHolder ID="head" runat="server">
</asp:ContentPlaceHolder>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:ContentPlaceHolder ID="ContentPlaceHolder1" runat="server">
<asp:Button ID="Button1" runat="server" Text="MasterPageButton" />
</asp:ContentPlaceHolder>
</div>
</form>
</body>
</html>
User control :
<%# Control Language="C#" AutoEventWireup="True" CodeBehind="SampleUserControl.ascx.cs"
Inherits="EventBubbling.Controls.SampleUserControl" EnableViewState="false" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Button ID="btnUC" runat="server" OnClick="btnUC_Click" Text="UserControlButton" />
</div>
</form>
</body>
</html>
User control.cs page :
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace EventBubbling.Controls
{
public partial class SampleUserControl : System.Web.UI.UserControl
{
public event EventHandler buttonClick;
protected void Page_Load(object sender, EventArgs e)
{
}
protected void btnUC_Click(object sender, EventArgs e)
{
buttonClick(sender, e);
}
}
}
Main Page :
<%# Page Language="C#" AutoEventWireup="True" MasterPageFile="~/SampleSite.Master"
CodeBehind="Default.aspx.cs" Inherits="EventBubbling._Default" %>
<%# Register Src="~/Controls/SampleUserControl.ascx" TagPrefix="uc" TagName="SampleUserControl" %>
<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="server">
<div>
<uc:SampleUserControl ID="UC1" runat="server" />
</div>
</asp:Content>
.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace EventBubbling
{
public partial class _Default : System.Web.UI.Page
{
Button btn = new Button();
protected void Page_Load(object sender, EventArgs e)
{
UC1.buttonClick += new EventHandler(UC1_buttonClick);
btn = this.Master.FindControl("Button1") as Button;
btn.Click += new EventHandler(btn_Click);
}
void btn_Click(object sender, EventArgs e)
{
Response.Write("EventBubbling from MasterPage");
}
void UC1_buttonClick(object sender, EventArgs e)
{
Response.Write("EventBubbling from User control");
}
}
}
My goal is to learn event bubbling but I get some basic error with this code I posted.
your user control should not have a < form> tag, this is taken care of by the MasterPage all pages / controls are then rendered inside this master control < form> tag.
If you want to have your user control with its own form you will have to change to a different MasterPage and to be honest I am not sure how that would even work.
Keep Id of form different every where you are using form tag.
every where its <form id="form1" runat="server">.
Make it as Id=1 , Id=2 ,etc.
In master page keep form Id=1 , in user control page make it as 2 and in main aspx make it as 3.
Or Remove form tag from usercontrol page.
Since you have placed controls in master page, you need to keep the <form> tag thereon.
The error message: A page can have only one server-side Form tag. should actually be taken as: A page can have only one visible server-side Form tag.
if you want you can have more than one form tags.
Read here one Great tricks of Asp.net: http://blogs.msdn.com/b/kaevans/archive/2005/10/19/482778.aspx . Definitely not of much practical use.
Else, You need to correct the Markup of your userControl. Remove tags like: head, html, form.
Your final markup of UserControl will be:
<%# Control Language="C#" AutoEventWireup="True" CodeBehind="SampleUserControl.ascx.cs"
Inherits="EventBubbling.Controls.SampleUserControl" EnableViewState="false" %>
<div>
<asp:Button ID="btnUC" runat="server" OnClick="btnUC_Click" Text="UserControlButton" />
</div>
I hope you get the idea what all needs to be removed.
All such pages or usercontrols that are going to be a part of this master page must not contain any <form> tag.