Re: How to pass a variable from Javascript code to Java

Hello Marwa,

The answer provided by Thiago is much simpler. 
Just put your data in a data attribute of a tag and then use the tutorial ajax and zones to send this data to a server side event handler. 
If you want to do it automatically without triggering a javascript event, just put you script in an on document ready event, to make sure your javascript code is called once the page is rendered and loaded by the browser. 


===> in html page

<div id=“myId” data-mydata=“mydata"></div>

===> javascript at the end of html page

$(function() {
	var dataToSend = $(‘#myId’).data(‘mydata’);
	ajax(‘pageData', { 
			data: dataToSend, // This doesn't need to be the same element as the one two lines above
            // Callback called when the request is finished. 
            // response.json is the object returned by the event handler method
			success: function(response) {
				alert('sent to server');
			}
		});
});


=====> in java page

JSONObject onPageData()
    {
        return new JSONObject("origin", "componentAction");
    }  


You can use jquery or something else.

Best
Numa



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> Le 28 août 2018 à 12:22, marwa hussein <[email protected]> a écrit :
> 
> Hello,
> 
> Thanks all for your suggestions. I followed the example shown in
> https://tapestry.apache.org/ajax-and-zones.html in "Invoking server-side
> event handler methods from JavaScript"   but here the event is in the java
> code "server-side" and is invoked from the Javascript code "onClick()" ,
> but what I want is the opposite direction, sending a "string variable" from
> a tag appended in  the clientside javascript code to the java code "in the
> serverside".
> For now, I will test to use hidden input (although I didn't want to use a
> form submit) and I will see if I can make it or not ...
> 
> Thank you all for your help and valuable suggestions, and of course, if
> anyone face the same problem before and could give me hints to how to do it
> please tell me.
> Regards,
> Marwa