text box change event

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i have member id text box and member drop down with name and ID

i have a fuctionality that when after binging dropdpwn i need to call dropdown_selected change event.

in same way when user enter member id in text box i need fire text box change event to check wherther ,drop down contains that value(ID) or not.

Posted 9-May-11 3:06am

karthikkushala

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Ankur^\m/ · Answer 1 · 2011-05-09T03:18:00

There is a TextBox1_TextChanged event for this.

XML

<asp:TextBox ID="TextBox1" runat="server" AutoPostBack="True" ontextchanged="TextBox1_TextChanged"></asp:TextBox>

C#

protected void TextBox1_TextChanged(object sender, EventArgs e)
{
    //do something.
}

This will let the page post back and the code will be executed on the server.

If you do not need server side processing, using JavaScript is recommended.
You can add an onblur event to the textbox and call a JavaScript function to do the required validation.

XML

<asp:TextBox ID="TextBox1" runat="server" onblur="return ValidateDDL();"></asp:TextBox>

C#

function ValidateDDL()
{
    if(document.getElementById("<%= DropDownList1.ClientID %>").value == document.getElementById("<%= TextBox1.ClientID %>").value)
    {
        alert("cannot be duplicate");
        return false;
    }
    return true;
}

Hope this helps!