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 Avoid unexpected postback after pressing Enter in textbox

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Registration date : 2007-01-01

PostSubject: Avoid unexpected postback after pressing Enter in textbox   Tue Jan 15, 2008 12:08 am

How to avoid unexpected postback after pressing Enter in textbox

Easy Way:


1)Goto you page / Master Page, where the form tag is

ex.
Code:
<form id="formNew" runat="server">

2)Now on Page_Init or OnInit - Make the Hidden Button your default button

Code:

    protected void Page_Init(object sender, EventArgs e)
    {

        formNew.DefaultButton = "";
    }

PS: You may still need to Handle the on Enter button as below and make it do nothing

How to Handle on Enter:

Below Example is if you have a master page, and are trying to access the OnEnterEvent from the child pages / contents / controls.

For a single simple page. Read point 1) , 2) , 3) and 5) . Replace with your code in 3) , for whatever you want the event handler to do

1)Goto you page / Master Page, where the form tag is

ex.
Code:
<form id="formNew" runat="server">

2)Create a New Image Button at the top of the page (just after the form tag) on the page like below, and make its width and height as 0 px and width as 0 px, and give it an ImageUrl (important)

ex.
Code:

<asp:ImageButton ID="HiddenButton" runat="server" OnClick="HiddenButton_Click" width="0px" Height="0px" ImageUrl="whatever.jpg" />

3)In the code behind, Create the HiddenButton_Click event handler

ex.
Code:
 
    protected void HiddenButton_Click(object sender, EventArgs e)
    {
        SubmitForm(sender,e);
        return;
    }


4)Create an OnSubmitForm event handler, in the code behind

Code:
   
    public EventHandler OnSubmitForm;

    /// <summary>
    /// On Enter Key Press AnyWhere in the Form
    /// </summary>
    public void SubmitForm(object sender, EventArgs e)
    {
        if(OnSubmitForm != null)
        {
            OnSubmitForm(sender, e);
        }
    }

5)Now on Page_Init - Make the Hidden Button your default button

Code:

    protected void Page_Init(object sender, EventArgs e)
    {

        formNew.DefaultButton = HiddenButton.ID;
    }
6) Read this step Incase you have a master page (ex. NormalMaster.master)

In your child page / contents / control add the below code to Handle the OnEnterEvent

Code:

    protected override void OnInit(EventArgs e)
    {
        base.OnInit(e);

        NormalMaster masterPage = (NormalMaster)(Page.Master);
        masterPage.OnSubmitForm += [CREATE NEW EVENT HANDLER];
  }
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