rashley has asked for the wisdom of the Perl Monks concerning the following question:

I have a CGI that's creating a button.

I know I can use -onsubmit to call a JavaScript to go and do something.

Can I call a JavaScript that returns a value, and assign that value?

For instance:

my button = button(-name=>'Name',
                   -value=>'Value',
                   -onclick=>"return dosomtehing()",
                   -onsubmit=>$Hash->{VALUE}="return getsomething()");

[download]

The syntax above for that last line doesn't work. Can this even be done? Thanks.

Replies are listed 'Best First'.
Re: Assigning a value from JavaScript onSubmit in CGI
by Anonymous Monk on Nov 16, 2006 at 17:52 UTC

    JavaScript running on the browser cannot set a variable in a program that's no longer running on the server. You'll have to take a different approach.

[reply]
      I was afraid of that. Thanks.
[reply]
Re: Assigning a value from JavaScript onSubmit in CGI
by BaldPenguin (Friar) on Nov 16, 2006 at 17:57 UTC
    Difficult, to my understanding, onsubmit is only valid in the 'form' tag, in fact the button press will not trigger a submit method at all. What is the actual flow you are looking for here?

    Don
    WHITEPAGES.COM | INC
    Everything I've learned in life can be summed up in a small perl script!
[reply]
      Well, I put a Perl function call in the -onsubmit of this button and it got called.

      I have an array reference. When my page gets created the CGI loops through the array and puts the values into Text boxes so they can be changed.

      I have a JavaScript to dynamically add rows to this table.

      When the form is submitted, I need to gather the current values and put them back in my array ref. Here's the code: 

      sub generateFlgNotes
{
    my $cgi = shift;
        my $readonly = shift;
        my $attr = shift;
        my $attrHash = shift;
        
        my $value = $attrHash->{VALUE};
        my $result;
                
     $result .= $cgi->start_table({-id=>'FlagNotesTable'}); 
     
      foreach my $note (@$value)
      {
           $result .= $cgi->Tr({}, 
                      $cgi->td("<TextArea>$note</TextArea>"));    
      }
        
        $result .= $cgi->end_table({});
        
        my $addbutton = button(-name=>'AddFlagNote',
           -value=>'Add Flag Note',
           -onclick=>"return addNote('FlagNotesTable', '')", 
           -onsubmit=>?????);
        
        $result .= $addbutton;
                
        return $result;
}

      [download]
[reply]
[d/l]
Re: Assigning a value from JavaScript onSubmit in CGI
by rashley (Scribe) on Nov 16, 2006 at 19:48 UTC
    What about putting them into a param, like this? 

    my $addbutton = button(-name=>'AddFlagNote',
    -value=>'Add Flag Note',
    -onclick=>"return addNote('FlagNotesTable', '')",
    -onsubmit=>print $cgi->hidden(-name=>'flagNotes',
                                  -default
           =>"return getAllNoteValues('FlagNotesTable')"));

    [download]

    Any reason why this approach wouldn't work?

[reply]
[d/l]

Back to Seekers of Perl Wisdom