Passing Bash variable to javascript

Shell Programming and Scripting
1

How do I pass a bash variable to a javascript?
I've tried

#!/bin/bash
echo "Content-type: text/html"
echo ""
echo "<html>"
echo "<head>"
counter=0
echo '<script>
window.parent.document.forms[0].counter.value = "$counter";  
</script>'

I have an iframe script which I am trying to pass a counter to the parent. All I get to display on the parent page is:

$counter

I've tried many variations for the varible like:

\'$counter\'
[ "$counter" ]
("$counter")
2

Did you try putting the echo in double quotes? i.e.

$ cat JS1
counter=3
echo "<script>
window.parent.document.forms[0].counter.value = '$counter';  
</script>"

$ ./JS1
<script>
window.parent.document.forms[0].counter.value = 3;
</script>
3

http headers are supposed to be \r\n terminated, not just \n (which is what your echo statements are doing). Probably unrelated to your javascript question, but it may save you debugging time.

4

Thank you scottn, works like a charm. Also, thanks alister for pointing out my html mistake.