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Using PHP variables in a Javascript function

I am trying to add a PHP variable $i, into a form element using a Javascript function, however this doesnt seem to be working at all, does anyone have any ideas why this may be? I am a novice coder so it may be something obvious. Any help please?

My code is:

HTML Code:

        <script type="text/javascript"> 

        function addvote() {

        var f = document.getElementById('vote');

        var entry_num = document.getElementById('entry_num')

        alert("document.write(entry_num)";

        document.forms.vote.entry_num.value=("<?php echo $i; ?>");

            if (f.entry_num.value!="")    {

            alert ("submitting vote");

                f.submit();

                                        }

                    else{

                        alert("error")

                        }

                           }

        </script>

Thanks

Re: Using PHP variables in a Javascript function

Instead do like this:

PHP Code:


		
			
<?php

print "<script type=\"text/javascript\">\n";

print "function addvote() {\n";

print "var f = document.getElementById('vote');\n";

print "var entry_num = document.getElementById('entry_num')\n";

print "alert(\"document.write(entry_num)\";\n";

print "document.forms.vote.entry_num.value=(" . $i . ");\n";

print "if (f.entry_num.value!=\"\") {\n";

print "alert (\"submitting vote\");\n";

print "f.submit();\n";

print "}\n";

print "else{\n";

print "alert(\"error\")\n";

print "}\n";

print "}\n";

print "</script>\n";

?>

This must work now.