I know in ASP.net, we can access a master page variable through content page, but is there anyway we can access a content page variable through the master page?
Yes you can. You have to implement a base class and content class should be derived from that base class.
EDIT : Posted markup and changed code for a clearer example
I have created a base page inherited the System.Web.UI.Page, then made the content page inherit it. My basepage:
namespace WebApplication2
{
public class BasePage : System.Web.UI.Page
{
public BasePage() { }
public virtual string TextValue()
{
return "";
}
}
}
Here's my content page markup:
<%# Page Title="Home Page" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="WebApplication2._Default" %>
<asp:Content runat="server" ID="BodyContent" ContentPlaceHolderID="MainContent">
<asp:Label ID="lblContentText" Text="Contentpage TextValue:" runat="server"></asp:Label>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
</asp:Content>
Content page code:
namespace WebApplication2
{
public partial class _Default : BasePage
{
protected void Page_Load(object sender, EventArgs e)
{
}
public override string TextValue()
{
return TextBox1.Text;
}
}
}
My Masterpage markup:
<%# Master Language="C#" AutoEventWireup="true" CodeBehind="Site.master.cs" Inherits="WebApplication2.SiteMaster" %>
<!DOCTYPE html>
<html lang="en">
<head runat="server">
<meta charset="utf-8" />
<title><%: Page.Title %> - My ASP.NET Application</title>
<asp:ContentPlaceHolder runat="server" ID="HeadContent" />
</head>
<body>
<form runat="server">
<header> </header>
<div id="body">
<asp:Label ID="lblText" runat ="server" Text="Masterpage Text :" />
<asp:TextBox ID="txtMaster" runat="server"></asp:TextBox>
<asp:Button ID="Button1" runat="server" Text="Click to read content page TextValue " OnClick="Button1_Click" />
<asp:ContentPlaceHolder runat="server" ID="MainContent" />
</div>
<footer>
</footer>
</form>
</body>
</html>
And the implementation in masterpage code behind:
namespace WebApplication2
{
public partial class SiteMaster : MasterPage
{
BasePage Currentpage = null;
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
Currentpage = this.Page as BasePage;
if (Currentpage != null)
{
txtMaster.Text = Currentpage.TextValue();
}
}
}
}
If you see any error like BasePase is not recognized, Please make sure that either it is using same namespace(i.e. WebApplication2), or the namespace is added to the implementation page (i.e. using WebApplication2;).
Hope it helps!
Related
Here is the following complete code
1) is the master page aspx
2) is the webform page aspx
3) is the webform C# file
The complete details as i suppose
now this ASP:content is already a form and also when i am adding form tag it is showing the page can have only form tage .Please can anyone help ?
Master page
<%# Master Language="C#" AutoEventWireup="true" CodeFile="MasterPage.master.cs" Inherits="MasterPage" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<asp:ContentPlaceHolder id="head" runat="server">
</asp:ContentPlaceHolder>
</head>
<body>
<form id="form1" runat="server">
<asp:Label ID="eliblogin" runat="server" Text="Login"></asp:Label>
</form>
<asp:ContentPlaceHolder id="ContentPlaceHolder1" runat="server">
</asp:ContentPlaceHolder>
</body>
</html>
masterpage.cs file
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class MasterPage : System.Web.UI.MasterPage
{
protected void Page_Load(object sender, EventArgs e)
{
Page.LoadComplete += new EventHandler(set_button);
}
protected void eliblogout_Click(object sender, EventArgs e)
{
var user = Context.User.Identity;
//authentication manager
var authenticationManager = HttpContext.Current.GetOwinContext().Authentication;
//logout
authenticationManager.SignOut();
Response.Redirect("~/Index.aspx");
}
private void set_button(Object sender,EventArgs e)
{
var user = Context.User.Identity;
if (user.Name!=null && user.IsAuthenticated)
{
try
{
//Username.Text = user.Name;
eliblogin.Visible = true;
eliblogin.Text = "yes man you did it";
// eliblogout.Visible = true;
}
catch (Exception ex)
{
//Username.Text = ex.ToString();
}
}
else
{
// Username.Text = "Hello Guest";
eliblogin.Visible = true;
// eliblogout.Visible = false;
}
}
}
Login.aspx
<%# Page Title="" Language="C#" MasterPageFile="~/MasterPage.master" AutoEventWireup="true" CodeFile="Login.aspx.cs" Inherits="Pages_Account_Login" %>
<asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
<asp:Label ID="liStatus" runat="server"></asp:Label>
<br />
<br />
<asp:Label ID="Label1" runat="server" Text="username"></asp:Label><br />
<br />
<asp:TextBox ID="txtUsername" runat="server"></asp:TextBox>
<br />
<asp:Label ID="Label2" runat="server" Text="Password"></asp:Label><br />
<br />
<asp:TextBox ID="txtPassword" runat="server" TextMode="Password"> </asp:TextBox>
<br />
<br />
<asp:Button ID="Button1" runat="server" Text="Login" OnClick="Button1_Click" />
</asp:Content>
login.aspx.cs file
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using Microsoft.AspNet.Identity;
using Microsoft.AspNet.Identity.EntityFramework;
using Microsoft.Owin.Security;
public partial class Pages_Account_Login : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
try
{
//User Store
UserStore<IdentityUser> userStore = new UserStore<IdentityUser>();
userStore.Context.Database.Connection.ConnectionString = System.Configuration.ConfigurationManager.ConnectionStrings["elibraryConnectionString"].ConnectionString;
//User Manager
UserManager<IdentityUser> manager = new UserManager<IdentityUser>(userStore);
//Create a new User
var user = manager.Find(txtUsername.Text,txtPassword.Text);
if (user!=null)
{
try
{
//Create user Object
//Database will be created Automatically
var authenticationManager = HttpContext.Current.GetOwinContext().Authentication;
var userIdentity = manager.CreateIdentity(user,DefaultAuthenticationTypes.ApplicationCookie);
authenticationManager.SignIn(new AuthenticationProperties
{
IsPersistent=false
},userIdentity);
}
catch (Exception ex)
{
liStatus.Text = ex.ToString();
}
}
else
{
liStatus.Text = "invalid username or password";
}
}
catch (Exception ex)
{
liStatus.Text = ex.ToString();
}
}
}
You should move
<form id="form1" runat="server">
<asp:Label ID="eliblogin" runat="server" Text="Login"></asp:Label>
</form>
from master page to login.aspx page and place all asp content of login page into this form tag.
I have a div in default.aspx with img inside as follow
<div id="sTab" class="tabs firsttab" runat="server">
<asp:Image ID="sTabImg" src="images/home.png" runat="server" />
Activities
</div>
I want to perform some action on click of the div in ASP.NET (not in javascript).
I tried the following
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
}
sTabImg.Attributes["onclick"] = ClientScript.GetPostBackEventReference(this, "ClickDiv");
}
protected void ClickDiv()
{
Label2.Text = "helo got it";
}
The page is getting refreshed and when i debugged the issue, its not entering the ClickDiv function..What wrong here..
From Here
public partial class _Default : System.Web.UI.Page, IPostBackEventHandler
{
protected void Page_Load(object sender, EventArgs e)
{
div1.Attributes["onclick"]=ClientScript.GetPostBackEventReference(this,"ClickDiv");
}
protected void Div1_Click()
{
// Do something
}
#region IPostBackEventHandler Members
public void RaisePostBackEvent(string eventArgument)
{
if (!string.IsNullOrEmpty(eventArgument))
{
if (eventArgument == "ClickDiv")
{
Div1_Click();
}
}
}
#endregion
}
You have to implement the IPostBackEventHandler Interface.
Why not use ImageButton?
<%# Page Language="C#" AutoEventWireup="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>
<title>ImageButton Sample</title>
<script language="C#" runat="server">
void ImageButton_Click(object sender, ImageClickEventArgs e)
{
Label1.Text = "You clicked the ImageButton control at the coordinates: (" +
e.X.ToString() + ", " + e.Y.ToString() + ")";
}
</script>
</head>
<body>
<form id="form1" runat="server">
<h3>ImageButton Sample</h3>
Click anywhere on the image.<br /><br />
<asp:ImageButton id="imagebutton1" runat="server"
AlternateText="ImageButton 1"
ImageAlign="left"
ImageUrl="images/pict.jpg"
OnClick="ImageButton_Click"/>
<br /><br />
<asp:label id="Label1" runat="server"/>
</form>
</body>
</html>
And you can see some examples here.
I'm writing an admin page where I have a textbox for user name and a refresh button which shows user details when clicked. Among other controls, I have a 'remove user' button to delete the user. I have javascript code to get confirmation before attempting this.
Because I do not want this Remove User button to have submit behavior, I have set UseSubmitBehavior=False. However, this caused the server side event to not get fired. So I wrote a small client side function to explicitly call __doPostBack.
The final code works, but only on pages that are not based off of a master page or nested master pages. Sadly all my web pages are based off of master pages.
Wondering if I'm missing something or if there is a way around? I've just started asp.net so please excuse any obvious mistakes.
Many thanks in advance.
Code Sample:
Following code works (webform with no master page)
<%# Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm_with_NoMasterPage.aspx.cs" Inherits="WebApplication1.WebForm_with_NoMasterPage" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<script type="text/javascript">
function GetConfirmation(btn, msg) {
if (confirm(msg)) {
__doPostBack(btn.id, '');
return true;
}
else {
return false;
}
}
</script>
<asp:Button ID="btnRemoveUser" runat="server" Text="Remove User" OnClick="btnRemoveUser_Click"
OnClientClick="return GetConfirmation(btnRemoveUser, 'Really remove?');"
UseSubmitBehavior="false"
Height="37px" Width="230px" />
</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;
namespace WebApplication1
{
public partial class WebForm_with_NoMasterPage : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void btnRemoveUser_Click(object sender, EventArgs e)
{
// put a breakpoint here and see if it is hit.
int x = 0;
}
}
}
Following does not work (same fragment but in a Webform based on masterpage):
<%# Page Title="" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeBehind="WebForm_WITH_MasterPage.aspx.cs" Inherits="WebApplication1.WebForm_WITH_MasterPage" %>
<asp:Content ID="Content1" ContentPlaceHolderID="HeadContent" runat="server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="FeaturedContent" runat="server">
</asp:Content>
<asp:Content ID="Content3" ContentPlaceHolderID="MainContent" runat="server">
<script type="text/javascript">
function GetConfirmation(btn, msg) {
if (confirm(msg)) {
__doPostBack(btn.id, '');
return true;
}
else {
return false;
}
}
</script>
<asp:Button ID="btnRemoveUser" runat="server" Text="Remove User" OnClick="btnRemoveUser_Click"
OnClientClick="return GetConfirmation(btnRemoveUser, 'Really remove?');"
UseSubmitBehavior="false"
Height="37px" Width="230px" />
</asp:Content>
Code behind:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace WebApplication1
{
public partial class WebForm_WITH_MasterPage : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void btnRemoveUser_Click(object sender, EventArgs e)
{
// put a breakpoint here and see if it is hit
int z = 0;
}
}
}
Below is my simple code to use control state in a custom control,
[DefaultProperty("Text")]
[ToolboxData("<{0}:WebCustomControl1 runat=server></{0}:WebCustomControl1>")]
public class WebCustomControl1 : WebControl
{
[Bindable(true)]
[Category("Appearance")]
[DefaultValue("")]
[Localizable(true)]
public string Text
{
get { return text; }
set { text = value; }
}
private string text;
protected override void RenderContents(HtmlTextWriter output)
{
output.Write(Text);
}
protected override void OnInit(System.EventArgs e)
{
base.OnInit(e);
Page.RequiresControlState(this);
}
protected override object SaveControlState()
{
object baseSate = base.SaveControlState();
return new Pair(baseSate, Text);
}
protected override void LoadControlState(object savedState)
{
Pair value = savedState as Pair;
text = value.Second;
}
}
But it doesn't seem to work.. The SaveControlState and LoadControlState are not firing. can someone help me..?
Below is the aspx Code. Here is where i use the custom control.
<%# Page Language="C#" AutoEventWireup="true" EnableViewState="true" CodeBehind="Default.aspx.cs" Inherits="WebApplication1._Default" %>
<%# Register Assembly="WebApplication1" Namespace="WebApplication1" TagPrefix="cc1" %>
<!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>Untitled Page</title>
</head>`enter code here`
<body>
<form id="form1" runat="server">
<div>
<cc1:WebCustomControl1 ID="WebCustomControl1_1" runat="server" />
<asp:Button ID="Button1" runat="server" Text="Button" /></div>
</form>
</body>
</html>
You've called RequiresControlState
Determines whether the specified Control object is registered to participate in control state management.`
But you should call RegisterRequiresControlState
Registers a control as one whose control state must be persisted.
i am calling two server side function with the help of page method but nothing happen.
here i am giving my code. so please tell me what mistake i made,
my aspx code
<%# Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="WebApplication1.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:ScriptManager ID="ScriptManager1" runat="server" EnablePageMethods="true">
</asp:ScriptManager>
<div>
Test
<br />
</div>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<br />
<br />
<asp:Button ID="btnSetvwState" runat="server" Text="Set Session Val" OnClientClick="SetSessionVal;return false;" />
<asp:Button ID="btnGetVwState" runat="server" Text="Get Session Val" OnClientClick="GetSessionVal;return false;"/>
<script language="javascript">
function preview() {
alert($get('TextBox1').value);
PageMethods.GetMessage("Hi", "Joy", onSuccess)
return false;
}
function onSuccess(res) {
alert(res);
}
function GetSessionVal() {
PageMethods.GetViewState(onSuccess)
return false;
}
function SetSessionVal() {
alert("pp");
PageMethods.SetViewState("Hi", "Tridip", onSuccess)
return false;
}
</script>
</form>
</body>
</html>
my server side code
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace WebApplication1
{
public partial class WebForm1 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
[System.Web.Services.WebMethod]
public static string GetMessage(string pr1,string pr2)
{
return pr1 + " " + pr2;
}
[System.Web.Services.WebMethod(EnableSession=true)]
public static void SetViewState()
{
HttpContext.Current.Session["data"] = "Hellp";
}
[System.Web.Services.WebMethod(EnableSession = true)]
public static string GetViewState()
{
return (String) HttpContext.Current.Session["data"] ;
}
}
}
please help me to catch the mistake. thanks
missing () here (SetSessionVal, GetSessionVal):
<asp:Button ID="btnSetvwState"
runat="server" Text="Set Session Val"
OnClientClick="SetSessionVal();return false;" />
<asp:Button ID="btnGetVwState"
runat="server" Text="Get Session Val"
OnClientClick="GetSessionVal();return false;"/>