Assign a Perl Array to Javascript variable

Question

I was attempting to integrate Perl code with JavaScript and came across an issue where I simply wanted to see the output of an Array I have stored within Perl. The following code gives me the proper elements within the array I have stored but I'm not able to see the elements within JavaScript.

my @list_of_vendors;
while(!$resultSet->EOF) {
push @list_of_vendors, $resultSet->Fields("vendor")->Value;
    $resultSet->MoveNext;
}

print "The First Vendor is: " . $list_of_vendors[0]. "\n";

This Prints out The First vendor is: 3D Systems The following code doesn't seem to give me the results I want...

print <<ONE;
<html>
<body>
<h4> Test Vendor Array Javascript </h4>

<p id="demo"</p>

<script type="text/javascript" language="JavaScript">
var myVendorArray = @list_of_vendors;
document.write('<p> $list_of_vendors[0] is the same as myVendorArray[0] </p>');

</script>
</body>
</html>
ONE

I thought this would give me 3D Systems is the same as 3D Systems but it gives a blank for the html screen.

Can anyone point out to me what I might be doing wrong? Or point me in the right direction to debug this using notepad++ or some other useful IDE for this. Thanks a bunch!!

Sorry not necessarily doesn't work but not giving me the results I think it is supposed to give...I want to see 3D Systems is the same as 3D Systems` on the html page... but for some reason this is not showing... — koala421
– koala421, Commented Jun 17, 2014 at 16:53
Have you tried doing a "View Source" to see the actually generated HTML? I think the problem will be pretty obvious . . . — ruakh
– ruakh, Commented Jun 17, 2014 at 17:04
@ruakh I tried that and noticed from here that I didn't get the results I wanted...The JavaScript picks up the variable but doesn't display it the way I want...It makes@list_of_vendors come back with a long string of vendors instead of being an array...Thanks for the suggestion #feelslikeanoob — koala421
– koala421, Commented Jun 17, 2014 at 18:24

mob · Accepted Answer · 2014-06-17 17:53:59Z

3

Everything in your code's heredoc is interpolated with Perl but interpreted by the client as JavaScript. So if you write

@list_of_vendors = ("Alice","Bob","Charlie");
...
print <<EOF;
...
<script>
var list_of_vendors = @list_of_vendors;
...
EOF

what the client will see is something like

var list_of_vendors = Alice Bob Charlie;

Perl has very good facilities for converting Perl data structures into the JSON notation, which is easily understood by JavaScript, so you should do something like:

use JSON;
$list_of_vendors_json = encode_json(\@list_of_vendors);
...
var list_of_vendors = $list_of_vendors_json;
...

in which case the browser would see something like:

var list_of_vendors = ["Alice","Bob","Charlie"];

and the rest of your code would work as intended.

answered Jun 17, 2014 at 17:53

mob

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2 Comments

koala421 Over a year ago

Do I have to download JSON for this two work or is this a functionality within perl that can be made or is there some type of add-on for this?

mob Over a year ago

Install JSON module with cpan.

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