ASP.NET

10-May-11 10:56

The Page property gives access to the content page.

Re: How can I access a method on a child page from its master page ?

S<T>::f(U) // Out of line.

Not Active10-May-11 11:31

Not Active

10-May-11 11:31

True enough but the page object would need to be cast to an object that had the method needed, either as a concrete class or interface. The master page would need to know too much in my view.
It would also limit the ability to change the master page if required. I like the flexibility of subscribing to an event.

I know the language. I've read a book. - _Madmatt

Re: How can I access a method on a child page from its master page ?

AspDotNetDev10-May-11 13:23

10-May-11 13:23

Mark Nischalke wrote:
It would also limit the ability to change the master page if required

Not if you put one method per interface.

Re: How can I access a method on a child page from its master page ?

S<T>::f(U) // Out of line.

Not Active10-May-11 13:43

Not Active

10-May-11 13:43

So adding more and more interfaces and implementations when more functionality is needed? Rube Goldberg would be proud.

I know the language. I've read a book. - _Madmatt

Re: How can I access a method on a child page from its master page ?

AspDotNetDev10-May-11 16:20

10-May-11 16:20

Events do have at least one distinct advantage. They are a public part of the class, which makes it more obvious that the functionality is available.

Re: How can I access a method on a child page from its master page ?

S<T>::f(U) // Out of line.

AspDotNetDev10-May-11 10:55

10-May-11 10:55

I will assume you are using C#. Use this.Page.

First, you will create an interface that defines the methods you want to call (I put this code in INamedObject.cs):

namespace WebApplication70
{
    public interface INamedObject
    {
        string GetName();
    }
}

Then, your Primary.Master will access this.Page and cast it as an INamedObject to call GetName():

ASP.NET

<%@ Master Language="C#" AutoEventWireup="true" CodeBehind="Primary.master.cs" Inherits="WebApplication70.Primary" %>
<%@ Import Namespace="WebApplication70" %>

<html>
<head runat="server">
    <title>Master/Page Example</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <h1><asp:Label runat="server" ID="lblPageName" /></h1>
        <asp:ContentPlaceHolder ID="body" runat="server" />
    </div>
    </form>
</body>
</html>

<script runat="server">
    protected void Page_Load(object sender, EventArgs e)
        {
            string pageName;
            if (this.Page is INamedObject)
            {
                pageName = (this.Page as INamedObject).GetName();
            }
            else
            {
                pageName = "Unknown Page";
            }
            lblPageName.Text = pageName;
        }
</script>

Create a page, Default.aspx, that makes use of the masterpage:

ASP.NET

<%@ Page Language="C#" MasterPageFile="~/Primary.Master" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="WebApplication70.Default" %>

<asp:Content ContentPlaceHolderID="body" runat="server">
    <p>This is the default page.</p>
</asp:Content>

In the code behind (Default.aspx.cs), you will implement the interface:

namespace WebApplication70
{
    public partial class Default : System.Web.UI.Page, INamedObject
    {
        public string GetName()
        {
            return "Default.aspx";
        }
    }
}

Re: How can I access a method on a child page from its master page ?

S<T>::f(U) // Out of line.

Keith Barrow10-May-11 11:40

Keith Barrow

10-May-11 11:40

I'd avoid doing this though, as far as possible. By implementing in this way you increase the coupling between the master page and this particular page. If this pattern were to be repeated it would result in a maintenance nightmare.
Depending on the reason the OP wants to pass information up to the MasterPage, there are normally other mechanisms.

Sort of a cross between Lawrence of Arabia and Dilbert.[^]
-Or-
A Dead ringer for Kate Winslett[^]

Re: How can I access a method on a child page from its master page ?

AspDotNetDev10-May-11 12:02

10-May-11 12:02

Often times, the purpose of the masterpage is to reuse content, and coupling isn't a factor. Besides, my example isn't tightly coupled... it makes use of an interface, which allows any page to implement the desired behavior (or not).

Still, an event driven technique (observer pattern) may be cleaner, though I'm not sure because I can't tell exactly what the OP wants to do.

Re: How can I access a method on a child page from its master page ?

S<T>::f(U) // Out of line.

Keith Barrow10-May-11 12:06

Keith Barrow

10-May-11 12:06

Oh I know what a MasterPage is for, and what you suggest breaks the intended pattern which spells trouble. You class mightn't be tightlight coupled, but it is more tightly coupled and this is a factor in maintainability. The eventing mechanism is just plain cleaner.

Sort of a cross between Lawrence of Arabia and Dilbert.[^]
-Or-
A Dead ringer for Kate Winslett[^]

Re: How can I access a method on a child page from its master page ?

AspDotNetDev10-May-11 12:09

10-May-11 12:09

Keith Barrow wrote:
The eventing mechanism is just plain cleaner.

Maybe, depending on the OP's needs. Could you give a clear code example of what you are envisioning?

Re: How can I access a method on a child page from its master page ? [modified]

S<T>::f(U) // Out of line.

Keith Barrow10-May-11 12:18

Keith Barrow

10-May-11 12:18

I'm not going to code it (1am here & I don't need the head-fry), but the process is simple enough:

1. Add an event to the masterpage, DatagridChanged or somesuch
2. The child subscribes to the event
3. When the datagrid on the masterpage is changed , the the event is raised and the subscribed handler does the work on the child.

Note the MasterPage is totally agnostic of the the Child, giving pure decoupling in that direction and the child can access any data it might need from the master page. You can even probably hook into the datagrid's own events, even neater.

[edit]
Also note I have corrected what I originally said: I got it totally wrong, it was 1:20am after all. now I'm off to the land of nod.

Sort of a cross between Lawrence of Arabia and Dilbert.[^]
-Or-
A Dead ringer for Kate Winslett[^]

modified on Tuesday, May 10, 2011 6:47 PM

fetching radiobutton control value from gridview

Karan_TN9-May-11 22:52

Karan_TN

9-May-11 22:52

through means of below code i add radiobutton to my gridview.

grdFeedback.DataSource = ds;
grdFeedback.DataBind();

 foreach (GridViewRow row in grdFeedback.Rows)
                {
                    if (row.Cells[3].Text == "" && row.Cells[4].Text == "" && row.Cells[5].Text == "" && row.Cells[6].Text == "" && row.Cells[7].Text == "")
                    {
                        TextBox txtAns = new TextBox();
                        txtAns.ID = "txtAns";
                        row.Cells[3].Controls.Add(txtAns);
                    }
                    else
                    {
                        for (int c = 3; c <= 7; c++)
                        {
                            if (row.Cells[c].Text != "&nbsp;")
                            {
                                RadioButton rbtn = new RadioButton();
                                string rbt = "rbtngrp";
                                string opt = row.Cells[c].Text;

                                rbtn.ID = rbt + row.RowIndex + c;
                                rbtn.Text = opt.ToString();
                                rbtn.GroupName = rbt + row.RowIndex;
                                row.Cells[c].Controls.Add(rbtn);
                            }
                        }
                    }
                }

how to check it whether the button is checked or not in an button click?. The below code i used. but its error : 'grdFeedback.Rows[0].Cells[4].Controls[2]' threw an exception of 'System.ArgumentOutOfRangeException' bool {System.ArgumentOutOfRangeException}

((CheckBox)(grdFeedback.Rows[0].Cells[4].Controls[2])).Checked

Re: fetching radiobutton control value from gridview

Roman_wolf10-May-11 0:29

Roman_wolf

10-May-11 0:29

First of all, you shouldn't be finding controls by indices. For one thing, it is confusing. Moreover, if you changed the order of your columns, you'll end up breaking your code.
Instead, use the row.FindControl method.

Another thing to check for the row type, since a grid may have several row types (header/footer/data/..)
So while you checkbox exists in the DataRow, it doesn't exist in the header row for example, which in turn probably causes your exception.

So you should do something like this:

foreach (GridViewRow row in grdFeedback.Rows)
{
    if (row.RowType == DataControlRowType.DataRow)
    {
        RadioButton btn=row.FindControl("RadioButton_ID_Goes_Here") as RadioButton;
        bool isChecked = btn.Checked;
        //do stuff
    }
}

Re: fetching radiobutton control value from gridview

Karan_TN10-May-11 1:33

Karan_TN

10-May-11 1:33

thanks for ur immediate reply roman.
but the this i have implemeted. but the same error.

((RadioButton)grdFeedback.Rows[0].Cells[3].FindControl("rbtn03")).Checked

but it returns error : ((System.Web.UI.WebControls.CheckBox)(((System.Web.UI.WebControls.RadioButton)(grdFeedback.Rows[0].Cells[3].FindControl("rbtn03"))))) is null

Also i dont know y its showing "System.Web.UI.WebControls.CheckBox" in error message.

plz help me

Thanks in advance

Re: fetching radiobutton control value from gridview

Roman_wolf10-May-11 20:58

Roman_wolf

10-May-11 20:58

I'm not sure how you set your controls in the datagrid, but

((RadioButton)grdFeedback.Rows[0]<big>.Cells[3]</big>.FindControl("rbtn03")).Checked shouldn't be needed.

Try this instead

((RadioButton)grdFeedback.Rows[0].FindControl("rbtn03")).Checked

As a rule of thumb, you shouldn't rely on indexes to fetch controls.

Also you need to make sure that the row is a data row, as the header row won't have the radiobutton

A stupid CustomValidator [Solved]

Ali Al Omairi(Abu AlHassan)9-May-11 22:12

Ali Al Omairi(Abu AlHassan)

9-May-11 22:12

guys;
i have a CustomValidator on a page that doesn't call its ClientValidationFunction.

can any one tell me what can cause this;

Help people,so poeple can help you.

Re: A stupid CustomValidator [Solved]

Ali Al Omairi(Abu AlHassan)10-May-11 3:30

Ali Al Omairi(Abu AlHassan)

10-May-11 3:30

I had to set ValidateEmtyText to true.
I knew that when i found this code in some web resources downloaded from the server:

JavaScript

function CustomValidatorEvaluateIsValid(val) {
    var value = "";
    if (typeof(val.controltovalidate) == "string") {
        value = ValidatorGetValue(val.controltovalidate);
        if ((ValidatorTrim(value).length == 0) &&
            ((typeof(val.validateemptytext) != "string") || (val.validateemptytext != "true"))) {
            return true;
        }
    }
    var args = { Value:value, IsValid:true };
    if (typeof(val.clientvalidationfunction) == "string") {
        eval(val.clientvalidationfunction + "(val, args) ;");
    }
    return args.IsValid;
}

100

Help people,so poeple can help you.

how can add javascript code ??

lolostar9-May-11 14:41

lolostar

9-May-11 14:41

Hi,

If I created page and inherit master page in it then i need to add JavaScript code to this page in the head tag , how I can make it because the head tag can not appear in the web page if is it inherit the master page on it .

thanks .

Anurag Gandhi9-May-11 19:13

Anurag Gandhi

9-May-11 19:13

You can put your javascript code script tag in the Content page also.
Its not necessary that you keep your javascript code in head tag.

Search google. you will get a lot of samples.

Anurag Gandhi.
http://www.gandhisoft.com
Life is a computer program and every one is the programmer of his own life.
My latest article: Group GridView Data

Nitin S9-May-11 19:19

Nitin S

9-May-11 19:19

In master page you can put contentplaceholder inside head tag,

and in the content pages add the script tag to the contentplaceholder,
in this way the script will go to head tag at runtime

cheers

============================================
The grass is always greener on the other side of the fence

lolostar9-May-11 20:10

lolostar

9-May-11 20:10

can you give me example please ???