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 12

Tweet

Other forums

LIMIT $start, 10... how to pass last value queried into next page with GET??
Ok I know how to display the first or last 10 results of a query...

$result = mysql_query(&q

Help with page encoding issue and weird characters
I'm trying to write a screen scraper and when I pull out the lines of the html file that I'm interes

Code error with Index.php
Error: Parse error: syntax error, unexpected T_STRING, expecting ',' or ';' in /home/runevid/public_

Converting RGB values to HEX
Code: <?PHP

$file_handle = fopen("colors/rgb.csv", "r");

wh

Xacute search within SQL results
I have a query that is pulling data, and I want to return a specific value from the results of that

URL Rewrite issue
Im created a series of Rewrites and on page checks to make sure the correct url is being called. But

Looking for help reading a .txt or .ini file and outputting the info.
I have a file called Info.ini and It has the following info:
Code: [General]
Online=0
I wou

How to calculate days from variable date?
This will be easy for one of you gurus. I want to fetch the date from a variable date, for example:<

Help with PHP Calendar code...
Hello, I'm new to this forum and I'm glad I found it.
I wrote this code for a PHP calendar as an

Displaying returned XML in another PHP page
I have an online payment form that will return XML given if a payment is successful or declines. I