Use User Control Java Script In Web Form?
Feb 2, 2010
I am creating user control with two list boxes, in between list boxes two buttons is there to move from one list box to another. Whenever button click i am using javascript to move from one list box to another. i want this user control is working in web from.(java script is not firing means it didn't move from one listbox to another)
default.aspx
<div>
<uc1:ListControl
ID="ucl1"
runat="server"
/> </div>
usercontrol.ascx
<asp:ListBox
ID="lstPreopDiagnosis"
runat="server"
SelectionMode="Multiple"
Rows="5" Width="220px">
<asp:ListItem
value="Urinary Urgency">Urinary Urgency</asp:ListItem>
</asp:ListBox>
<asp:HiddenField
ID="HiddenField2"
runat="server"
/> .......................
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1 Create a web user control named WebUserControl_Label using a web application project. This control works fine when used in an webform in the same project.
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<asp:Label ID="Label1" runat="server" ></asp:Label>
This is the code behind:
namespace TestWebAppWithCustomControl
{
public partial class WebUserControl_Label : System.Web.UI.UserControl
{
private string _labelText;
public string LabelText
{
set
{
Label1.Text = value;
}
get
{
return Label1.Text;
}
}
protected void Page_Load(object sender, EventArgs e)
{
}
}
}
2. Create a single assembly for the user control above using a Web Deployment project. The name of the assemby is TestWebAppWithCustomControl.
3. Create a webform in another web application project to use WebUserControl_Label user control. This project has TestWebAppWithCustomControl.dll added as a referemce.
This is how I am using the custom control above in an aspx page:
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="ConsumeTestWebAppUserControl._Default" %>
<%@ Register Assembly="TestWebAppWithCustomControl" Namespace="TestWebAppWithCustomControl" TagPrefix="GBS" %>
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<GBS:WebUserControl_Label Id="label1" runat="server" LabelText="This is custom label" />
</div>
</form>
</body>
</html>
The problem is that .NET throws a Null Reference Exception when its trying to set the label text via the LabelText property. It looks like that the label control that lives inside the WebUserControl_Label user control is not getting instantiated and is always null.
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Oct 25, 2010
I have created dynamic controls in ASP.NET as following ..
first i have created checkbox as
CheckBox chkDynamic = new CheckBox();
Then
TextBox txtDynamic = new TextBox();
txtDynamic.ID = "txtDynamic";
and these controls added in tablecell added in tableRow added in Table added in aspPanel(Only panel created at design page)
Now what i need.. when checkbox is selected i want to clear the txtDynamic Textbox using JavaScript
I tried following ways but not working..
chkDynamic.Attributes["onclick"] = "javascript:document.getElementById('" + txtDynamic.UniqueID + "').value='';";
also i tried with calling Method as
chkDynamic.Attributes.Add("onclick", "javascript:ClearText(this)");
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document.getElementById("<%= txtDynamic.ClientID %>").value="";
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If I have another user control, ucChild, inheriting from ucBase, the label in ucBase's code is always null. ucChild has no controls in its ascx fileThe server controls (like the label) needs to be declared in the ascx file and not created programmatically.What needs to be done for ucBase to see its own controls when it's a parent user control?
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