what is postback?

I always see the term "postback" from ASP book, but I am not sure if I fully
understand the meaning. Here's my understanding so far, please correct me if
any mistakes.

Here's a typical html form:
<form action="process.asp" method="post">
'GUI code
</form
"postback" action happens when the user click the submit button, that means
it will invoke "process.asp" is the above code.

In ASP.NET, if the web control has set AutoPostBack property to True, that
means when there is any events on the web control, it will invoke
"process.asp", just like the user click the submit button.

Please advise. Thanks!Matt,
Postback is something that happens whenever the server
gets a request for this page from the second time onwards
It need not be mandatorily a submit button, probs even a
click which requiers a server side validation is also
results in a postback.

Postback is sending back the page some information
irrespective of either it is submit or a name for
validation.

Ajay
>--Original Message--
>I always see the term "postback" from ASP book, but I am
not sure if I fully
>understand the meaning. Here's my understanding so far,
please correct me if
>any mistakes.
>Here's a typical html form:
><form action="process.asp" method="post">
>'GUI code
></form>
>"postback" action happens when the user click the submit
button, that means
>it will invoke "process.asp" is the above code.
>In ASP.NET, if the web control has set AutoPostBack
property to True, that
>means when there is any events on the web control, it
will invoke
>"process.asp", just like the user click the submit button.
>Please advise. Thanks!
>
>
>.
On Wed, 29 Oct 2003 22:22:00 -0800, "Matt" <mattloude@.hotmail.com>
wrote:

>I always see the term "postback" from ASP book, but I am not sure if I fully
>understand the meaning. Here's my understanding so far, please correct me if
>any mistakes.
>Here's a typical html form:
><form action="process.asp" method="post">
>'GUI code
></form>
>"postback" action happens when the user click the submit button, that means
>it will invoke "process.asp" is the above code.
>In ASP.NET, if the web control has set AutoPostBack property to True, that
>means when there is any events on the web control, it will invoke
>"process.asp", just like the user click the submit button.

Basically the same. Postback just means that when the form is
submitted, the same script that created the form does the processing.
So in your case, the file would be process.asp, and when submitted,
the form would pass the values to process.asp, invoking itself again.

Jeff
In addition to the other posts, be aware that a postback is not the same
thing as a refresh. In other words, a postback does not just represent the
second (or subsequent) time the page is being loaded. A postback represents
just what its name says: a post-back of data to the server.

Usually, a submit button causes a postback, but as you've pointed out, many
controls have an "AutoPostBack" property which, when set to true, make using
that particular control act as if it was a submit button.

"Matt" <mattloude@.hotmail.com> wrote in message
news:%23CUEj4qnDHA.1948@.TK2MSFTNGP12.phx.gbl...
> I always see the term "postback" from ASP book, but I am not sure if I
fully
> understand the meaning. Here's my understanding so far, please correct me
if
> any mistakes.
> Here's a typical html form:
> <form action="process.asp" method="post">
> 'GUI code
> </form>
> "postback" action happens when the user click the submit button, that
means
> it will invoke "process.asp" is the above code.
> In ASP.NET, if the web control has set AutoPostBack property to True, that
> means when there is any events on the web control, it will invoke
> "process.asp", just like the user click the submit button.
> Please advise. Thanks!
>
Let's use the example and assume this is in process.asp

> > Here's a typical html form:
> > <form action="process.asp" method="post">
> > 'GUI code
> > </form
When we click the submit button, the form will send the data in web control
to the server, and then call "process.asp." Since the form is in
process.asp, and "process.asp" is the form to call, so it makes us think the
page is being loaded again, or have the same effect as refresh the page. The
smart navigation property is to prevent the page from blinking?

Please advise! Thanks!

"Scott M." <s-mar@.badspamsnet.net> wrote in message
news:eIX5W6ynDHA.2772@.TK2MSFTNGP12.phx.gbl...
> In addition to the other posts, be aware that a postback is not the same
> thing as a refresh. In other words, a postback does not just represent
the
> second (or subsequent) time the page is being loaded. A postback
represents
> just what its name says: a post-back of data to the server.
> Usually, a submit button causes a postback, but as you've pointed out,
many
> controls have an "AutoPostBack" property which, when set to true, make
using
> that particular control act as if it was a submit button.
>
> "Matt" <mattloude@.hotmail.com> wrote in message
> news:%23CUEj4qnDHA.1948@.TK2MSFTNGP12.phx.gbl...
> > I always see the term "postback" from ASP book, but I am not sure if I
> fully
> > understand the meaning. Here's my understanding so far, please correct
me
> if
> > any mistakes.
> > Here's a typical html form:
> > <form action="process.asp" method="post">
> > 'GUI code
> > </form>
> > "postback" action happens when the user click the submit button, that
> means
> > it will invoke "process.asp" is the above code.
> > In ASP.NET, if the web control has set AutoPostBack property to True,
that
> > means when there is any events on the web control, it will invoke
> > "process.asp", just like the user click the submit button.
> > Please advise. Thanks!
"Matthew Louden" <jrefactors@.hotmail.com> wrote in message
news:O1dO7bAoDHA.2676@.TK2MSFTNGP11.phx.gbl...
> Let's use the example and assume this is in process.asp
> > > Here's a typical html form:
> > > <form action="process.asp" method="post"
Actually, the line would look like this:

<form method="post" runat="server"
Since, ASP.NET forms are server-side forms and server-side forms MUST submit
to themselves (even if you put Action="someOtherPage.aspx", it will
disregard that and submit to itself).

> > > 'GUI code
> > > </form>
> When we click the submit button, the form will send the data in web
control
> to the server, and then call "process.asp." Since the form is in
> process.asp, and "process.asp" is the form to call, so it makes us think
the
> page is being loaded again, or have the same effect as refresh the page.

The page is being loaded again, but this time it has form data to extract
and process with. Under this circumstance, this page load is called a
"PostBack". A page refresh does not always cause the page to be rebuilt as
a "PostBack".

> The smart navigation property is to prevent the page from blinking?

SmartNavigation causes the page to reload to the scrolled position it was in
during the last page render.

> Please advise! Thanks!
> "Scott M." <s-mar@.badspamsnet.net> wrote in message
> news:eIX5W6ynDHA.2772@.TK2MSFTNGP12.phx.gbl...
> > In addition to the other posts, be aware that a postback is not the same
> > thing as a refresh. In other words, a postback does not just represent
> the
> > second (or subsequent) time the page is being loaded. A postback
> represents
> > just what its name says: a post-back of data to the server.
> > Usually, a submit button causes a postback, but as you've pointed out,
> many
> > controls have an "AutoPostBack" property which, when set to true, make
> using
> > that particular control act as if it was a submit button.
> > "Matt" <mattloude@.hotmail.com> wrote in message
> > news:%23CUEj4qnDHA.1948@.TK2MSFTNGP12.phx.gbl...
> > > I always see the term "postback" from ASP book, but I am not sure if I
> > fully
> > > understand the meaning. Here's my understanding so far, please correct
> me
> > if
> > > any mistakes.
> > > > Here's a typical html form:
> > > <form action="process.asp" method="post">
> > > 'GUI code
> > > </form>
> > > > "postback" action happens when the user click the submit button, that
> > means
> > > it will invoke "process.asp" is the above code.
> > > > In ASP.NET, if the web control has set AutoPostBack property to True,
> that
> > > means when there is any events on the web control, it will invoke
> > > "process.asp", just like the user click the submit button.
> > > > Please advise. Thanks!
> > > > >