usercontrol c#.net to call an event

Question

User1046245955 posted

I have a user control that contains a textbox and some buttons.

How can I tell the text has changed?

here's my code:

<%@ Register Src="File.ascx" TagName="uDatePicker" TagPrefix="uc1" %>

<uc1:uDatePicker ID="dfrom" runat="server" CssClass="mydropdownlist" />

<asp:TextBox ID="datefrom" runat="server" AutoPostBack="true" autocomplete="off" OnTextChanged="datefrom_TextChanged" CssClass="mydropdownlist"></asp:TextBox>
<asp:CalendarExtender ID="c_date_from" runat="server" Format="dd-MMM-yyyy" TargetControlID="datefrom" Animated="true">
</asp:CalendarExtender>

how can i put the OnTextChanged="datefrom_TextChanged" in my uc1:uDatePicker or in codebehind c# .net

Answer 1

User-2054057000 posted

How can i put the OnTextChanged="datefrom_TextChanged" in my uc1:uDatePicker or in codebehind c# .net. 

You could use jQuery change event for this in your .aspx page.

$(".mydropdownlist").change(function () {
    //...
});

Then inside this you can make some AJAX call.

Refer this tutorial - https://www.yogihosting.com/jquery-change/

Answer 2

User288213138 posted

Hi paminchever,

According to your description, I made a demo for your reference.

I called the method on main page using delegate in user control.

usercontrol:

Usercontrol:

<asp:Button ID=Button1 runat="server" Text="I am Inside User Control" OnClick="btnTest_Click" />

        public delegate void OnButtonClick(string strValue);

        public event OnButtonClick btnHandler;     
        protected void Page_Load(object sender, EventArgs e)
        {

        }

        protected void btnTest_Click(object sender, EventArgs e)
        {
            
            if (btnHandler != null)
            {
                btnHandler(string.Empty);
            }

webform:

<%@ Register src="WebUserControl.ascx" tagname="WebUserControl" tagprefix="uc1" %>
<uc1:WebUserControl ID="WebUserControl1" runat="server" />

protected void Page_Load(object sender, EventArgs e)
        {
            
             WebUserControl1.btnHandler += new WebUserControl.OnButtonClick(WebUserControl1_btnHandler);
        }
        void WebUserControl1_btnHandler(string strValue)
        {
            Response.Write("This is method in main");
        }

The result:

Best regards,

Sam