How to include an applet from a web page in a different directory?

Question

I'm trying to use the jZebra printing applet and am not sure how to use it from pages in different directories. The sample page has the following code:

<applet 
    id="qz"
    name="QZ Print Plugin"
    code="qz.PrintApplet.class"
    width="55"
    height="55">
    <param name="jnlp_href" value="qz-print_jnlp.jnlp">
    <param name="cache_option" value="plugin">
    <param name="disable_logging" value="false">
</applet>

If the applet (qz-print.jar) and another file (qz-print_jnlp.jnlp) are in the same directory as the page with that code, then it works fine. However, I don't know what to change to get it to work if the web page is in a different directory. It seems like this is a trivial question, but I've been searching and haven't been able to find the answer.

How should I modify the above code to get the applet in the web page when it's in a different directory?

Answer 1

The tag you are using:

<param name="jnlp_href" value="qz-print_jnlp.jnlp">

Is the equivalent of this: (notice the "./"):

<param name="jnlp_href" value="./qz-print_jnlp.jnlp">

Java uses absolute or relative paths, just as an image tag would <img src="./foo.png />

So, if you've placed your applet in one folder called "dist" (ie http://mysite/dist/qz-print.jar ) but your page was located in another folder called "web"(ie http://mysite/web/mypage.html ) then you would have to change your relative applet tag to this:

<param name="jnlp_href" value="../dist/qz-print_jnlp.jnlp">

Or optimally, change the tag to be absolute path to the jnlp:

<param name="jnlp_href" value="/dist/qz-print_jnlp.jnlp">

Additionally, as qz finds better ways to load these tags, we put them in the sample.html. I would recommend you use the latest version from here .

At the time of writing this, the best way to use the tags is this way: <applet id="qz" archive="./qz-print.jar" name="QZ Print Plugin" code="qz.PrintApplet.class" width="55" height="55"> <param name="jnlp_href" value="qz-print_jnlp.jnlp"> <param name="cache_option" value="plugin"> <param name="disable_logging" value="false"> <param name="initial_focus" value="false"> <param name="separate_jvm" value="true"> </applet><br />

Note that the archive tag should be updated as well as the jnlp tag.

The three changes from the sample you are using to the sample I've provided above are:

1. Initial focus stealing prevention for jQuery focus() events
2. The archive= tag for compatibility with certain versions of Safari.
3. The separate_jvm tag is used to load a new instance of the Java Framework on page load, which seems to resolve some sporadic loading issues with Java 8.

Finally, if you have clients that still run Java 6, I would advise you use deployQZ(); from sample.html instead, which does Java client version detection using Oracle's deployJava.js script.

-Tres