ASP.NET

WebCustomControl, create events

15-May-06 0:00

Get the sample code from the site[^], then run in VS 2005. The ASP.NET 2.0 with VS 2005 supports backward compatibility, so if you have the sample code with datagrid running on the ASP.NET 1.x, then it should be working fine with the version 2.0. Or do you mean the GridView[^] control which is the successor of the datagrid control.

Piovra_14-May-06 19:54

Piovra_

14-May-06 19:54

I have created a new WebControlLibrary. What i would like is to create a mouse hover event on the control but i have no idea how to achieve this behaviour. Is it possible to create mouse events on a custom control and how would it be done ?

Re: WebCustomControl, create events

minhpc_bk14-May-06 20:43

Re: WebCustomControl, create events

14-May-06 20:43

What does your custom control look like? What does it do? How do you want to use the mouse events with your custom control? Basically, you can simply attach the mouse events to the Attribute collection of a child control of the custom control, if you are developing a composite control. If you create a rendered control, you can manage to do that in the overriden Render method. You can see the MSDN[^] for more information.

Piovra_14-May-06 23:50

Piovra_

14-May-06 23:50

Well the control doesn't look like anything yet. It's just a new WebControlLibrary, i have set the backcolor so i can see it in the webpage, what i would like is when i hover the mouse over the control the event is triggered.

Re: WebCustomControl, create events

minhpc_bk15-May-06 16:09

Repeater changing my name attributes

15-May-06 16:09

Piovra_ wrote:
It's just a new WebControlLibrary, i have set the backcolor so i can see it in the webpage, what i would like is when i hover the mouse over the control the event is triggered.

Do you mean it's just a default control added to the project when you create a new web control library? When you hover the mouse over the control, you want the event to be triggered, so do you mean the onmouseover event or a custom event defined in the control. If it is simply the onmouseover event, you can add the onmouseover="alert();" to the control declaration on the web page.

eggie514-May-06 19:49

14-May-06 19:49

Why does the repeater always change the name attributes of my checkboxes???? What the crap? how do I stop this? It keeps making them unique whent they should be identical..

/\ |_ E X E GG

minhpc_bk14-May-06 20:05

14-May-06 20:05

Alex,
In the ASP.NET, any control should always be uniquely identified, so by default the id of the control within the scope of a naming container contains the id of its container. In the case of the repeater, the id of the checkboxes contains the id of the RepeaterItem, and the ASP.NET automatically does that for you. If you want this thing not to happen to the checkboxes, you may consider using the html checkbox input element which is not marked with the runat="server".

eggie514-May-06 20:06

14-May-06 20:06

oh the runat is doing it, thanks.

/\ |_ E X E GG

eggie514-May-06 20:13

14-May-06 20:13

Actually, I'm kinda confused. So, I'll just keep my checkbox as runat=server.

But I'm confused on how I can access the checkbox from my code behind file....

Any tips?

/\ |_ E X E GG

minhpc_bk14-May-06 20:27

14-May-06 20:27

eggie5 wrote:
So, I'll just keep my checkbox as runat=server.

Yes, leave the checkbox marked with the runat="server".

eggie5 wrote:
But I'm confused on how I can access the checkbox from my code behind file....

The sample code below shows you a way to access the checkbox in code-behind:

foreach (RepeaterItem item in Repeater1.Items)
{
    CheckBox chkBox = item.FindControl("chkBox") as CheckBox;
    //HtmlInputCheckBox chkBox = item.FindControl("chkBox") as HtmlInputCheckBox;
    if (chkBox != null)
    { 
        //TODO: You now can access its value.
        ....
    }
}

Depending which control you are using, you can choose the line with the CheckBox or the HtmlInputCheckBox control. In addition to the FindControl method, you can also access the checkbox control using the Controls collection.

eggie514-May-06 20:29

14-May-06 20:29

I notice you only use "chkBox" for the checkbox ID, was this just for the example? I'm going to have to build the id dynamically right?

/\ |_ E X E GG

minhpc_bk14-May-06 20:38

14-May-06 20:38

You name the checkbox as chkBox, or whatever you like, and you can use it later with the FindControl method. Also, you should bind data to the value attribute of the checkbox instead of the id of the control.

eggie514-May-06 20:36

14-May-06 20:36

it seems as though the Items collection is all null...

/\ |_ E X E GG

eggie514-May-06 20:48

14-May-06 20:48

foreach (RepeaterItem item in RepeaterCurrentAbstracts.Items)

do you have any idea why all my items would be null?

/\ |_ E X E GG

minhpc_bk14-May-06 21:10

14-May-06 21:10

When/where do you run this code? It's before or after the datasource is bound to the control ( or the control hierarchy is built)? Btw, below is a quick example:

<%@ Page Language="C#" %>
           
<script runat="server">
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            Hashtable datasource = new Hashtable();
            datasource.Add("key1", "value1");
            datasource.Add("key2", "value2");
            datasource.Add("key3", "value3");
            datasource.Add("key4", "value4");
            datasource.Add("key5", "value5");

            Repeater1.DataSource = datasource;
            Repeater1.DataBind();
        }
    }
	             
    protected void Button1_Click(object sender, EventArgs e)
    {
        foreach (RepeaterItem item in Repeater1.Items)
        {
            CheckBox chkBox = item.FindControl("chkBox") as CheckBox;
            if (chkBox != null && chkBox.Checked)
                Response.Write("Selected value: " + chkBox.Attributes["value"] + "<br>");
        }
    }
</script>
	               
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:Repeater ID="Repeater1" runat="server">
            <ItemTemplate>
                <asp:CheckBox runat="server" ID="chkBox" 
				Text='<%# DataBinder.Eval(Container.DataItem, "Value") %>'
				Value='<%# DataBinder.Eval(Container.DataItem, "Key") %>' />
                <br />
            </ItemTemplate>
        </asp:Repeater>
        <br />
        <asp:Button ID="Button1" runat="server" Text="Push Me" On_Click="Button1_Click" />
    </div>
    </form>
</body>
</html>

eggie514-May-06 21:39

14-May-06 21:39

HMMM... I don't know what the deal is but the debugger said the Items were null, but apparently it is working... Kinda...

I have a quick question on state. So I am on my webpage and check a checkbox and then click a button which runs a method in my code behind (so it posts back). I should have access to that checked using the FindControl code above right? Or is the state lost between the postback? Do I have to save the checkbox state somehow and then re set them?

/\ |_ E X E GG

minhpc_bk14-May-06 23:49

How to assaign value to input tag

14-May-06 23:49

eggie5 wrote:
So I am on my webpage and check a checkbox and then click a button which runs a method in my code behind (so it posts back). I should have access to that checked using the FindControl code above right?

Yes.

eggie5 wrote:
Or is the state lost between the postback?

No.

eggie5 wrote:
Do I have to save the checkbox state somehow and then re set them?

No. The checkbox control knows how to save its checked status. In fact, the checkbox control updates its checked property at the server side based on it's postback data. If the checkbox is checked, its value is submitted to the server, and the control can gets the value when the post data is loaded (in the LoadPostData method). If the checkbox is not checked, data is not sent to the server, and based on this postback data, the control knows how to set the Checked property accordingly.

nesaraja14-May-06 19:41

nesaraja

14-May-06 19:41

Hi all,

how to assign value to input file type tag.
i.e

i want to assign value to the control. when i give
file.value="india.gif"

it shows a error..
how to solve it. Pls help mee.
thanks

Paul

Re: How to assaign value to input tag

minhpc_bk14-May-06 20:11