how to assign javascript values to Perl variables

Question

i have this javascript function:

print <<"EOT";
<script type="text/javascript">
 function alertSize() {
  var myWidth = 0, myHeight = 0;
  if( typeof( window.innerWidth ) == 'number' ) {
    //Non-IE
    myWidth = window.innerWidth;
    myHeight = window.innerHeight;
  } else if( document.documentElement && ( document.documentElement.clientWidth || document.documentElement.clientHeight ) ) {
    //IE 6+ in 'standards compliant mode'
    myWidth = document.documentElement.clientWidth;
    myHeight = document.documentElement.clientHeight;
  } else if( document.body && ( document.body.clientWidth || document.body.clientHeight ) ) {
    //IE 4 compatible
    myWidth = document.body.clientWidth;
    myHeight = document.body.clientHeight;
  }
    window.alert( 'Width = ' + myWidth );
    window.alert( 'Height = ' + myHeight );
}
</script>
EOT
print "<body onload='alertSize()'>";
print "</body>";

my $windowHeight = $q->param('myHeight');
my $windowWidth = $q->param('windowwidth');
print "<$windowHeight><$windowWidth>";

How to pass the values of and from javascript function to my Perl variables ?

You already asked almost the same question in stackoverflow.com/questions/10480705/… - try to be more specific. — simbabque
– simbabque, Commented May 8, 2012 at 10:20

Quentin · Accepted Answer · 2012-05-08 08:28:42Z

6

Your Perl is running on the server. It outputs some text which is sent to the client (the browser).

The browser then interprets that text and HTML and JavaScript.

You can't pass data back to Perl without making a new HTTP request.

Your options include:

Finish the processing with JavaScript instead of trying to pass it back to Perl
Use Ajax to make a new HTTP request
Set location.href to load a new page with the data passed in the query string
Find a way to achieve your (unspecified) goal without using your current logic (e.g. you could use CSS media queries to style a page differently based on browser dimensions).

answered May 8, 2012 at 8:28

Quentin

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2 Comments

Ciprian Lungu Over a year ago

i will use that values to sendit to the css file to calculate the <div> height

Quentin Over a year ago

Make use of percentages or media queries instead.

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