While cookies can be used the way you describe, I would like to warn that
they have several drawbacks. They are added to every requests from the
browser to the server, until they expire or some code explicitly deletes
them. It means that the size of unrelated requests might grow. Also it
complicates handling situations when user opens a page in several
tabs/windows, and the code would try to pass back different values (e.g.
based on user interactions with the page). There are also limits on the
size and number of cookies. Of course in some situations, cookies are the
best option (e.g. tracking some per-user state), but more often they are
not.
Cezary
On Thu, Aug 30, 2018 at 12:23 AM heph estos <h3ph3s...@gmail.com> wrote:
> And how about storing the value to a session or a cookie from javascript
> and reading from java server through an implemantation of observer
> parttern? It would work in any case, in any framework.
>
> Στις Τετ, 29 Αυγ 2018, 2:39 μ.μ. ο χρήστης marwa hussein <
> marwa.huss...@gmail.com> έγραψε:
>
> > Hi,
> > Thank you all for guiding me to the solution especially "Numa" .. and
> this
> > is how I solved it:
> > for the .tml
> > <p id="myId" data-mydata="testvalue"/>
> >
> > and in the JS JQuery file, I passed the variable in a JSON object -->
> data:
> > {myData:dataToSend}
> > $('#myId').click(function() {
> > var dataToSend= $('#myId').data('mydata');
> > ajax('answer', {
> > element: $('#myId'),
> > data:{ myData:dataToSend},
> > success: function(response) {
> > }
> > });
> > });
> >
> > and in java file, I used @RequestParameter("myData") to get the value
> from
> > the JSON object:
> > @OnEvent("answer")
> > @PublishEvent
> > public void answer(@RequestParameter("myData") String varName)
> > {
> > System.out.println("Variable name is :"+ varName );
> > }
> >
> > Regards,
> > Marwa
> >
> >
> > On Tue, Aug 28, 2018 at 3:20 PM Numa Schmeder <n...@dfacto.ch> wrote:
> >
> > > 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
> > >
> > >
> > >
> > > <http://www.dfacto.ch/> Numa Schmeder www.dfacto.ch <
> > > http://www.dfacto.ch/>
> > > n...@dfacto.ch <mailto:n...@dfacto.ch> | M +41 79 538 30 01
> > >
> > > DIGITAL STRATEGY | DESIGN | DEVELOPMENT
> > >
> > >
> > >
> > >
> > > > Le 28 août 2018 à 12:22, marwa hussein <marwa.huss...@gmail.com> 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
> > >
> > >
> >
> > --
> >
> >
> >
> > *Marwa Hussein M. TA @ Information Systems Department Faculty of
> Computers
> > & Information Assuit University*
> > <imanhe...@yahoo.com>
> >
>
