JavaScript to find which button is pressed among multiple buttons

I have multiple TextBoxes and multiple buttons on the page. If I hit Enter key while I'm in one TextBox the corresponding Button click event should be executed.

I have written the code like below, but It is not working. Can anybody please explain me how...

<div>
    <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
    <asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" />
    <br />
    <br />
    <br />
    <br />
    <br />
    <br />
    <asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>
    <asp:Button ID="Button2" runat="server" Text="Button" OnClick="Button2_开发者_如何学PythonClick" />
    <br />
    <br />
    <br />
    <br />
    <br />
    <br />
    <asp:TextBox ID="TextBox3" runat="server"></asp:TextBox>
    <asp:Button ID="Button3" runat="server" Text="Button" OnClick="Button3_Click" />
    <br />
    <br />
    <br />
    <br />
    <br />
    <br />
    <asp:TextBox ID="TextBox4" runat="server"></asp:TextBox>
    <asp:Button ID="Button4" runat="server" Text="Button" OnClick="Button4_Click" />
</div>

Code behind

public partial class JavaScriptEnterKey : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        TextBox1.Attributes.Add("OnKeyDown", "HitButton('" + Button1.ClientID + "');");
        TextBox2.Attributes.Add("OnKeyDown", "HitButton('" + Button2.ClientID + "');");
        TextBox3.Attributes.Add("OnKeyDown", "HitButton('" + Button3.ClientID + "');");
        TextBox4.Attributes.Add("OnKeyDown", "HitButton('" + Button4.ClientID + "');");
    }

    protected void Button1_Click(object sender, EventArgs e)
    {
        Response.Write("Button1 is clicked");
    }

    protected void Button2_Click(object sender, EventArgs e)
    {
        Response.Write("Button2 is clicked");
    }

    protected void Button3_Click(object sender, EventArgs e)
    {
        Response.Write("Button3 is clicked");
    }

    protected void Button4_Click(object sender, EventArgs e)
    {
        Response.Write("Button4 is clicked");
    }

}


**JavaScript**
function HitButton(Button) {
    if (event.keyCode == 13) document.getElementById(Button).click();
}

Try using the keypress event rather than keycode. That seemed to work in my code.