Using Perl mason variables in Javascript

Question

Let's say I have a variable called $taskid defined in <%init>. Can I generate a JavaScript function from that variable?

<script language="javascript">

window.onload = function() {
   alert("<% $taskid %>");
};

</script>


<%init>

my $taskid=1;

</%init>

Is it possible to initialize a Javascript varable from Perl? — jas7
– jas7, Commented Oct 31, 2013 at 18:43
Mason processes the data before it is sent through the http server to the client. Therefore, you can even generate whole javascript functions in otherwise static html from within mason. Otherwise: if the html is on the client - and the javascript does one or another thing there, this NOW cannot be affected by mason because it NOW does not originate from the http server. — rubber boots
– rubber boots, Commented Oct 31, 2013 at 18:47
In the time it took you to post this question you could have just tried running that Mason code to see what happens. — friedo
– friedo, Commented Oct 31, 2013 at 18:53

fthiella · Accepted Answer · 2013-11-13 20:45:20Z

1

This worked:

<script language="javascript">        
    window.onload = function() {
       alert("<% $taskid %>");
    };        
</script>

<%init>        
    my $taskid=1;
</%init>

edited Nov 13, 2013 at 20:45

fthiella

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answered Oct 31, 2013 at 20:54

jas7

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Comments

ikegami · Accepted Answer · 2013-10-31 19:14:08Z

0

Is it possible to initialize a JavaScript variable from Perl?

Since you asked that three times even though it has nothing to do with what you posted, I'll answer it.

No.

Languages can't take actions, much less initialize. A Perl program cannot do so either. A process cannot access variables a) in a different virtual machine, b) in a different process, c) on a different machine. All three apply here.
JavaScript variables can only be initialized by JavaScript assignments. You would need to either
1. have a JS expression that somehow communicated with a Perl process (e.g. AJAX), or
2. generate the executed JavaScript code as you showed.

answered Oct 31, 2013 at 19:14

ikegami

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