Thanks Jean.
Yes, I understand. I think what would be useful, is a JS function to invoke
a java method server-side, since I find myself doing this ajax round trip
all the time. So what I'm proposing a JS function call, say:
JavaServer.call("mycomponent.mymethod", {JSON data input}, "(return type)'
);
Which runs the ajax in JS required calling a generic xwiki page url with a
velocity script maybe which invokes the java component passed with the JS
parameter and return the "html/text" or "application/json" data as
specified.
Currently I have like 50 static terminal pages which is only used to pass
data from the JS with ajax to a velocity script to a java component and
back. Basically, the only difference in those velocity scripts is the
method name. So kinda feel that it might be possible to "short-cut' this
velocity page, with a standard velocity macro which invokes the passed
method. I'm pretty sure this will add client side "reactive"-like
functionality to xwiki as you can invoke server-side functions from JS
events. In principle like in Meteor.js were you do a
Method.call("methodname",function(){}), although the underlying
architecture differs greatly.
Keep up the good work
Gerrie van wyk
On Thu, Jan 28, 2016 at 11:56 AM, Jean SIMARD [via XWiki] <
[email protected]> wrote:
> Dear gervwyk,
>
> From what I understand of components and Javascript, it will not be
> possible. Components are Java code and therefore are executed on
> server-side. Velocity, is also script that is executed server-side.
> And Javascript is client-side, so it doesn't have the logic for
> components. As far as I know, we don't have any possibility to execute
> server-side Javascript in XWiki at the moment. So a component doesn't
> have much sense for Javascript.
>
> However, instead of following [1], you may also create a REST component
> on server-side (which will also allow AJAX). Look [2] for documentation
> about writing new REST components. You'll loose a bit of flexibility
> (because you'll have to build JAR and restart the wiki each time you
> change source code) but you won't have to deal with Velocity.
>
> Note there is also a new extension that may fill your need but I'm not
> sure it's exactly what you need [3].
>
> Hope it helps.
>
> [1] http://extensions.xwiki.org/xwiki/bin/view/Extension/AJAX+example
> [2]
>
> http://platform.xwiki.org/xwiki/bin/view/Features/XWikiRESTfulAPI#HCustomresources
> [2]
>
> http://extensions.xwiki.org/xwiki/bin/view/Extension/Structured+data+access+JS+API
>
> On 28/01/2016 10:30, gervwyk wrote:
>
> > Is it possible to call a java component from a JavaScriptExtension? like
> > this:
> >
> > In javascript:
> >
> > require(['jquery'], function ($) {
> > $('#ToJava').click(function(){
> > var returnValue = $services.mycomponent.mymethod( someNumber );
> > // use return value
> > });
> > });
> >
> > In java:
> >
> > public int mymethod(int num){
> > return num +1;
> > }
> >
> > I know that I can do the ajax round trip and invoke the method through
> > velocity:
> > http://extensions.xwiki.org/xwiki/bin/view/Extension/AJAX+example
> >
> > -- just wondering if there is a way to shortcut this process by avoiding
> > velocity and only working in js?
> > or is my logic flawed?
> >
> >
> >
> >
> > --
> > View this message in context:
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>
> --
> Jean Simard
> [hidden email] <http:///user/SendEmail.jtp?type=node&node=7597706&i=1>
> Research engineer at XWiki SAS
> http://www.xwiki.com
> Committer on the XWiki.org project
> http://www.xwiki.org
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