Fire event on enter key press for a textbox

Solution 1:

1. Wrap the textbox inside asp:Panel tags

2. Hide a Button that has a click event that does what you want done and give the <asp:panel> a DefaultButton Attribute with the ID of the Hidden Button.

<asp:Panel runat="server" DefaultButton="Button1">
   <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>    
   <asp:Button ID="Button1" runat="server" style="display:none" OnClick="Button1_Click" />
</asp:Panel>

Solution 2:

ASPX:

<asp:TextBox ID="TextBox1" clientidmode="Static" runat="server" onkeypress="return EnterEvent(event)"></asp:TextBox>    
<asp:Button ID="Button1" runat="server" style="display:none" Text="Button" />

JS:

function EnterEvent(e) {
        if (e.keyCode == 13) {
            __doPostBack('<%=Button1.UniqueID%>', "");
        }
    }

CS:

protected void Button1_Click1(object sender, EventArgs e)
    {

    }

Solution 3:

You could wrap the textbox and button in an ASP:Panel, and set the DefaultButton property of the Panel to the Id of your Submit button.

<asp:Panel ID="Panel1" runat="server" DefaultButton="SubmitButton">
    <asp:TextBox ID="TextBox1" runat="server" />
    <asp:Button ID="SubmitButton" runat="server" Text="Submit" OnClick="SubmitButton_Click" />
</asp:Panel>

Now anytime the focus is within the Panel, the 'SubmitButton_Click' event will fire when enter is pressed.

Solution 4:

ahaliav fox 's answer is correct, however there's a small coding problem.
Change

<%=Button1.UniqueId%> 

to

<%=Button1.UniqueID%> 

it is case sensitive. Control.UniqueID Property

Error 14 'System.Web.UI.WebControls.Button' does not contain a definition for 'UniqueId' and no extension method 'UniqueId' accepting a first argument of type 'System.Web.UI.WebControls.Button' could be found (are you missing a using directive or an assembly reference?)

N.b. I tried the TextChanged event myself on AutoPostBack before searching for the answer, and although it is almost right it doesn't give the desired result I wanted nor for the question asked. It fires on losing focus on the Textbox and not when pressing the return key.