ASP.NET 2.0 - Enter Key - Default Submit Button


Posted on 16th Feb 2014 07:03 pm by admin

Hi,One of the most annoying things in developing web pages is handling the "Enter key" for form submission. Enter key has been the favourite way users like to submit forms. Though we provide Buttons to click on, the easiest and intuitive way is that, I can enter some text, make some changes and then hit "Enter" to accomplish my submission.

"Enter" Key is handled in a little tricky way by uplevel browsers like Internet Explorer, when it comes to ASP.NET.

If there is a single Textbox and single button, then it becomes straight forward, the button is submitted. However, the event code doesnt get executed, though the page postsback.If there are two or more, buttons, then it takes up the first button as the default button. However, it still doesnt execute the event handler but just refreshes the page.You can supress the Enter key event using Javascript. But this would result in other undesirable effects like, any Enter key in the form i.e. within Text Area or basically where large text is entered, would be disabled.The earlier work around was to associate a javascript function to each Button to verify the that the relevant button is submitted upon Enter key.ASP.NET 2.0 introduces a wonderful work around for this. By simply specifying the "defaultbutton" property to the ID of the , whose event you want to fire, your job is done.The defaultbutton property can be specified at the Form level in the form tag as well as at panel level in the definition tag. The form level setting is overridden when specified at the panel level, for those controls that are inside the panel.Also, the Event Handler for the specified button, fires thereby simulating a true submit button functionality.The following sample code contains a form and 4 panels with each of them containing different buttons. It can be noticed that for each panel, there is a default button specified which would trigger the corresponding button's event handler when "Enter" Key is pressed upon a text changed event.



























The corresponding, sample events for the button clicks are
protected void Button1_Click(object sender, EventArgs e)
{
Response.Write(Button1.Text);
}
protected void Button2_Click(object sender, EventArgs e)
{
Response.Write(Button2.Text);
}
protected void Button3_Click(object sender, EventArgs e)
{
Response.Write(Button3.Text);
}
protected void Button4_Click(object sender, EventArgs e)
{
Response.Write(Button4.Text);
}
protected void btn1_Click(object sender, EventArgs e)
{
Response.Write(btn1.Text);
}
protected void Button5_Click(object sender, EventArgs e)
{
Response.Write(Button5.Text);
}Once we execute the above functionality, we can notice, the corresponding Buttons' text are displayed when the Enter key is pressed from within a panel and at the form level, it fires the btn1 Button's event.Thanks

No comments posted yet

Your Answer:

Login to answer
237 Like 12 Dislike
Previous forums Next forums
Other forums

Problem with array max size.
Hi to everyone,
I've got a homework about filling a bidimensional array un spiral shape, I alre

What is SAP Avatar ?
Hi All,

This G.Satish , my boss asked me to explore on SAP Avatar. I searced in internet

my login script page is not working on remote computers
hi my login is working on my computer, but when i tried 2 computers from 2 different locations, they

Connecion issue
Hi,

For some reason, I keep getting this error when trying to connect:

Warning: mysql_

Getting number of affected rows in SQLPLUS..
Hi everyone,
I have a shell script where i am invoking sqlplus, running a query and saving t

UPLOAD IMAGES NOT WORKING!
Hi there i have a upload script in which it uploads the picture to a folder than creates two thumbna

Dealing with code in db query
I am dealing with C code and I need to make sure it is encoded some how to ensure its integrity and

What are causes of a connection-timeout with fopen()?
Hello! Here is the situation: The server I host my website on just upgraded it's PHP build from 4.4.

Javascript form submit and radio buttons?
When this form is submitted, it is automatically resubmitted using JS.

All my fields are carr

server trace logs
could any one tell me from where do i get error logs in xMII??I want to check the reason for dtabase

Sign up to write
Sign up now if you have flare of writing..
Login   |   Register
Follow Us
Indyaspeak @ Facebook Indyaspeak @ Twitter Indyaspeak @ Pinterest RSS



Play Free Quiz and Win Cash