Correct syntax to insert Java variable into HTML?

if I define a Java variable "num" in a function in the header of an HTML page, how can I pass the value of that variable in a form on the same page?

example:

<form method="POST" action="mailscript.html">
    <input type="hidden" name="java_var" value="num">
    <input class="button" type="submit" value="Submit">
</form>

what is the correct syntax to insert the java variable into the HTML?
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ob1_Asked:
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alanpetersenConnect With a Mentor Commented:
Oh, so you are using Javascript, not Java. In your question you said you were creating a Java variable. Java != Javascript

In any case, in a Javascript function, you can set the value of a field like this:
  document.getElementById('java_var').value = num

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alanpetersenCommented:
I'm assuming that when you say you are creating an HTML page, you really mean a JSP page. In that case, you could print the value of "num" in the input element like this:

  <input type="hidden" name="java_var" value="<%= num %>" />

If you were using JSTL, you could also use Expression Language (EL) to get the variable (and make things more readable):

  <input type="hidden" name="java_var" value="${num}" />
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ob1_Author Commented:
no it is an HTML page, what is JSP?
could i use this:
 
 

<input type="hidden" name="numberof" value="<script type="text/javascript">document.write(num);</script>"

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Gurvinder Pal SinghCommented:
then this num is a javscript variable.
When you said 'Java Variable' it created the confusion.
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kadabaConnect With a Mentor Commented:
<input type="hidden" name="java_var" value="num">
you should use an id attribute

<input type="hidden" id="java_var" name="java_var">

then the usage of
document.getElementById('java_var').value = num;
will be proper.


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ob1_Author Commented:
wow i didn't even think there would be a different between java and javascript i guess that makes sense - thanks!
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