Client-Side PerlScript
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Thread: Client-Side PerlScript

  1. #1
    Just Another Geek
    Join Date
    Jul 2002
    Location
    Rotterdam, Netherlands
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    Client-Side PerlScript

    Hi all. I'm going nuts... I cannot get this thing to work.. Must be doing something wrong but I can't figure out what...

    Here's a code example:
    Code:
    <HTML>
    <HEAD>
    <META HTTP-EQUIV="CACHE-CONTROL" CONTENT="NO-CACHE">
    <TITLE>formtest</TITLE>
    </HEAD>
    <BODY>
    <FORM NAME=myform>
    <INPUT TYPE=text NAME=mytest>
    <INPUT TYPE=submit>
    </FORM>
    <SCRIPT LANGUAGE=PerlScript>
    $mytest = $window->document->myform->mytest->{'Value'};
    
    $window->document->write("Debug: $mytest\n");
    
    </SCRIPT>
    </BODY>
    </HTML>
    It has no errors. But I cannot seem to get the value of the textfield...

    I'm using ActivePerl 5.8, IE6 on WinXP.
    Oliver's Law:
    Experience is something you don't get until just after you need it.

  2. #2
    Senior Member
    Join Date
    Jul 2004
    Posts
    469
    When the page loads, and the code is parse, the text box is empty.

  3. #3
    Just Another Geek
    Join Date
    Jul 2002
    Location
    Rotterdam, Netherlands
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    Yes. But when I type something in there and click on submit..
    I can see the page reloading with "?mytest=thetextityped" appended..
    The textbox shows the typed text but the variable stays empty..
    Oliver's Law:
    Experience is something you don't get until just after you need it.

  4. #4
    Senior Member
    Join Date
    Jul 2004
    Posts
    469
    Is the text box blank in the second instance? I've never used perlscript so I'm only gandering here, but I would guess that when you initialize the form the second time, its clearing the value. Also, should you be referencing the form or the retained data?

  5. #5
    Hi mom!
    Join Date
    Aug 2001
    Posts
    1,103
    I never used perlscript before, but as I'm seeing it, you're never suppling a value for your textfield. That way, the contents of that textfield will always be empty. Try this:

    Code:
    <HTML>
    <HEAD>
    <META HTTP-EQUIV="CACHE-CONTROL" CONTENT="NO-CACHE">
    <TITLE>formtest</TITLE>
    </HEAD>
    <BODY>
    <FORM NAME="myform" METHOD="GET">
    <INPUT TYPE="text" NAME="mytest" VALUE="Foo">
    <INPUT TYPE="submit">
    </FORM>
    <SCRIPT LANGUAGE="PerlScript">
    $mytest = $window->document->myform->mytest->{'Value'};
    
    $window->document->write("Debug: $mytest\n");
    
    </SCRIPT>
    </BODY>
    </HTML>
    I can't test it, since I have no activeperl installed. You should get something in your textbox, and that same word should be printed in the body of your page, as far as I see.

    By the way: you should also specify that your form uses the GET method to send those variables (<FORM NAME="yadda" METHOD="GET"&gt.
    I wish to express my gratitude to the people of Italy. Thank you for inventing pizza.

  6. #6
    Senior Member
    Join Date
    Mar 2004
    Posts
    557
    Hi

    I think, the problem lies in the submit button. The parameters are
    sent by GET/POST, which might complicate things unnessarily for
    client-side scripting. I would try to replace the submit with an ordinary
    button, or just call a PerlScript-function onclick.

    Code:
    <HTML>
    <HEAD>
    <META HTTP-EQUIV="CACHE-CONTROL" CONTENT="NO-CACHE">
    <TITLE>formtest</TITLE>
    </HEAD>
    <BODY>
    <FORM NAME=myform>
    <INPUT TYPE=text NAME=mytest>
    <INPUT TYPE=submit onclick="my_perlfunction">
    </FORM>
    <SCRIPT LANGUAGE=PerlScript>
    sub my_perlfunction {
    
    $mytestvalue = $window->document->myform->mytest->{'Value'};
    $window->document->write("Debug: $mytestvalue\n");
    }
    </SCRIPT>
    </BODY>
    </HTML>
    or

    Code:
    <HTML>
    <HEAD>
    <META HTTP-EQUIV="CACHE-CONTROL" CONTENT="NO-CACHE">
    <TITLE>formtest</TITLE>
    </HEAD>
    <BODY>
    
    <FORM NAME="myform">
    <INPUT TYPE="text" ID="id_mytest">
    <INPUT TYPE="button" onclick="my_perlfunction" value="Submit Query">
    </FORM>
    
    <SCRIPT LANGUAGE="PerlScript">
    sub my_perlfunction {
    
    $testelement = $window->document->getElementById("id_mytest")->value;
    $window->document->write("Debug: $testelement\n");
    }
    
    </SCRIPT>
    </BODY>
    </HTML>
    I'd go with the ID-version, which is standard (?) for passing values from
    one scripting language to another.

    Cheers.
    If the only tool you have is a hammer, you tend to see every problem as a nail.
    (Abraham Maslow, Psychologist, 1908-70)

  7. #7
    Just Another Geek
    Join Date
    Jul 2002
    Location
    Rotterdam, Netherlands
    Posts
    3,403
    Thanx guys.. I'm a bit closer now.. removed the submit button (it was for test anyway) and used an <SELECT> in combination with an ID field..
    Code:
    <HTML>
    <HEAD><TITLE>TEST</TITLE>
    <META HTTP-EQUIV="CACHE-CONTROL" CONTENT="NO-CACHE">
    <SCRIPT LANGUAGE=PerlScript>
    sub mychange {
    	my $aa = $window->document->getElementByID("mytest")->value;
    	$window->document->write("<h1>Debug: $aa</h1>");
    }
    </SCRIPT>
    </HEAD>
    <BODY>
    <FORM><SELECT ID=mytest onChange="mychange();">
    <OPTION VALUE=1>Choice 1</OPTION>
    <OPTION VALUE=2>Choice 2</OPTION>
    </SELECT></FORM>
    </BODY>
    </HTML>
    Btw this works too:
    Code:
    <HTML>
    <HEAD><TITLE>TEST</TITLE>
    <META HTTP-EQUIV="CACHE-CONTROL" CONTENT="NO-CACHE">
    <SCRIPT LANGUAGE=PerlScript>
    sub mychange {
    	my $aa = $window->document->myform->myselect->{'Value'};
    	$window->document->write("<h1>Debug: $aa</h1>");
    }
    </SCRIPT>
    </HEAD>
    <BODY>
    <FORM NAME=myform><SELECT NAME=myselect onChange="mychange();">
    <OPTION VALUE=1>Choice 1</OPTION>
    <OPTION VALUE=2>Choice 2</OPTION>
    </SELECT></FORM>
    </BODY>
    </HTML>
    Oliver's Law:
    Experience is something you don't get until just after you need it.

  8. #8
    Just Another Geek
    Join Date
    Jul 2002
    Location
    Rotterdam, Netherlands
    Posts
    3,403
    Just for kicks here's a variation:
    Code:
    <HTML>
    <HEAD><TITLE>TEST</TITLE>
    <META HTTP-EQUIV="CACHE-CONTROL" CONTENT="NO-CACHE">
    <SCRIPT LANGUAGE=PerlScript>
    sub myform::klik_onClick {
    	my $aa = $window->document->myform->myselect->{"Value"};
    	$window->document->write("<h1>klik: $aa</h1>");
    }
    sub myform::myselect_onChange {
    	my $aa = $window->document->myform->myselect->{"Value"};
    	$window->document->write("<h1>change: $aa</h1>");
    }
    </SCRIPT>
    </HEAD>
    <BODY>
    <FORM NAME=myform><SELECT NAME=myselect>
    <OPTION VALUE=1>Choice 1</OPTION>
    <OPTION VALUE=2>Choice 2</OPTION>
    </SELECT><INPUT TYPE=button VALUE="Go" NAME=klik></FORM>
    </BODY>
    </HTML>
    This one doesn't seem to like ID's though.. If I try to use ID's the onChange doesn't work anymore. Even if I use NAME and ID fields.. Same values and/or different ones for NAME/ID.

    Oh well, got enough to get me going
    Oliver's Law:
    Experience is something you don't get until just after you need it.

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