What happens when you click on an input of type submit? The form is submitted.

What happens when you click on a button? I don't know.. depends on the button.. but nothing leads me to think it would have a default behaviour of submitting the form..

Dig deeper into your HTML source. Is the button later bound to an action with javascript? Remember, WWW::Mechanize can't work out what javascript code does, so you're going to have to assist it. If the javascript submits the form, then perhaps you should call $mechanize->submit().

Monarch is right.

The thing you might consider if you really need to check JavaScript in your page, is have a look at httpunit.

"We all agree on the necessity of compromise. We just can't agree on when it's necessary to compromise." - Larry Wall.

I supose itīs a mistake... when I see, the correct use is "<input type=button>", itīs true on HTML 3 (1997!!). But HTML 4 use this syntax... I need to return to school or to W3Schools! ;)

This question isnīt a WWW:Mechanize problem... Itīs a occurs because HTML::Form design, when used package IgnoreInput to do button actions!! Can you submit a bug at cpan with more samples!!!
I currently donīt need to use WWW::Mechanize, and donīt has samples to make a good question to autor!)

On time... HTML::Form is a package from libwww-perl.
To post but you need to use RT at CPAN with good data for autorīs work...

For solve your problems before wait eval and possible correct on HTML::Form try it:

 my $mech = WWW::Mechanize->new( autocheck => 1 );

  #-- Redefine package to do button tasks (using same of submit)
  $HTML::Form::type2class{button} = "SubmitInput";

  $mech->get( "...your url..." );
  $mech->click('button_name');
  print $mech->content;
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