See my working demo above in this thread:
(https://github.com/sveine/tapestry-multi-module-demo/blob/master/module1-root/module1/src/main/resources/META-INF/modules/publisheventdemo.js)

From: Thiago H de Paula Figueiredo [via Apache Tapestry Mailing List Archives] 
[mailto:ml+s1045711n5733456...@n5.nabble.com]
Sent: 27. april 2017 14:11
To: Svein-Erik Løken <sv...@jacilla.no>
Subject: Re: [Announcement] New feature for Tapestry 5.4.2 and 5.5: easily call 
event handler methods from JavaScript

On Thu, Apr 27, 2017 at 6:43 AM, abangkis <[hidden 
email]</user/SendEmail.jtp?type=node&node=5733456&i=0>> wrote:

> Hi. Thanks for the awesome improvement. I want to adopt it immediately.


Hi! Nice! :)


> But I've stumbled to one problem. How do I pass a parameter to the event?
>

You don't pass it to the event, but to the t5/core/ajax() function. Check
the data property of the options parameter in
https://tapestry.apache.org/current/coffeescript/ajax.html. Basically, you
pass an object with the key/value pairs you want passed as parameters:

ajax('answer', {
    element: $('#result'),
/* Here it goes */
data: {
queryParameter1: valueParameter1,
queryParameter2: valueParameter2
}
/* Here it ends */
    success: function(response) {
        $('#result').text(response.json.origin);
    }
});


--
Thiago

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