John Thanks for the reply.. let me digest it... hehehe..
Well I know EXT its heavy, but I see no other way to create such a grid,
due my lack of knowledge in JS and the resquest-response loop, I need to
check more theory then.
Ok so let me see If I understood after reading 3 times... and checking
google what is JSON about... hehe,.. I ko about it, but I never worked with
it.. I thought it was dead notation. :S.
So.
public WOActionResults handleRequest(WORequest request, WOContext
context) {
will be invoked when form within the JS I will create a new XMLRequest() ?
which as I think it's done by the prototype.js that uses the Ajax framework
isn't? (Im jsut checking the JSONExample in the Ajax examples).
then it will look in the request a String with binding "data" and then
convert it to a JSON object and place it in the response.
So here in this method is where I generate the list of objects I need to
send and place it into a JSON object, put it in the respose and send back to
the client.. isn't ?
Not clear:
1. the actionName... this comes from the parent? no... where is that
binding?
2. JSONObject jsonResponse = (JSONObject)
action.invoke(parent(), new
JSONObject(inputString)); .... what am I doing here?.3/. What for do I need
to get the String of "data" String inputString =
request.stringFormValueForKey("data"); If when Im requesting it has nothing?
I dunno.. im kinda confused here..
I dunno if the JSONExample that is there, does what Im trying to do here...
and what you explain me... I see there is a AjaxProxy binding, and then
simply they ask for data form the JS as var a = <name>.
<proxyName>.method(). and then in the Application.java they register the
service which in the example is a ExampleService?..
so I can do something like that but with my custom logic that return the
data as an Object?
I dunno to many things in my mind,.. but if this what Im thinking its
correct then my mind its getting clear.. I wish to learn more in depth how
to do things.. but I will be reinventing the wheel... hehe .
G.
On Fri, Sep 4, 2009 at 12:47 PM, John Bruce <[email protected]> wrote:
> Hi Gustavo,
>
> You can use the Wonder Ajax framework to get JSON data loaded so that
> Ext can use it as a data store. The pricipal is to have a component
> that generates a url which Ext can use as the remote address for a
> JSON data store. A very rough example which is similar to the
> AjaxProxy one is:
>
> public class AjaxSimpleProxy extends AjaxComponent {
>
> public String actionName;
>
> public AjaxSimpleProxy(WOContext context) {
> super(context);
>
> }
>
> @Override
> public void reset() {
> actionName = null;
> super.reset();
> }
>
>
> @Override
> protected void addRequiredWebResources(WOResponse response) {
>
> }
>
> @Override
> public void appendToResponse(WOResponse response, WOContext context)
> {
> //WOComponent component = context.component();
>
> String actionUrl =
> AjaxUtils.ajaxComponentActionUrl(context);
>
> response.appendContentString(actionUrl);
>
> super.appendToResponse(response, context);
> }
>
> public String actionName() {
> if (actionName == null) {
> actionName = (String) valueForBinding("actionName");
> }
> return actionName;
> }
>
>
> @Override
> public WOActionResults handleRequest(WORequest request, WOContext
> context) {
> WOResponse response = AjaxUtils.createResponse(request,
> context);
>
> String inputString = request.stringFormValueForKey("data");
>
> if (log.isDebugEnabled()) {
> log.debug("AjaxSimpleProxy.handleRequest: input = "
> + inputString);
> }
>
> NSSelector action = new NSSelector(actionName(), new Class[]
> {
> JSONObject.class } );
>
> try {
> JSONObject jsonResponse = (JSONObject)
> action.invoke(parent(), new
> JSONObject(inputString));
>
> response.setContent(jsonResponse.toString());
> response.setHeader("application/json",
> "content-type");
>
> } catch (Exception e) {
> e.printStackTrace();
> }
>
>
> return response;
> }
>
>
>
> }
>
> Basically the idea in this component is to bind the name of an action
> in the parent component that accepts a JSONObject as the argument.
>
> When rendering the main HTML response for that page this component
> generates a url which when called will looked for a request paramater
> called "data" which it expects to be JSON data. It will then turn that
> into a JSON object and invoke a method in the parent component that
> match the name of the "actionName" binding. It expects that this
> method takes a JSONObject as the only parameter. In that method you
> can do whatever you need but the return value should also be a
> JSONObject and then that result is returned as the content of the
> response.
>
> This is a very basic component and is just to illustrate one way it
> can be done. You would want to clean it up if you actually use it in
> production. It doesn't do anything cleaver for you but can allow you
> to send JSON data back and forth to a WOComponent from JS in your
> page.
>
> Other ways include creating a direct action to return the JSON data
> for the EXT grid. This is simpler but has the problem that it is
> outside your component.
>
> Ext can be very heavy weight and require a lot of files to be
> downloaded to the client browser. It's also likes things to be done in
> the *Ext Way* which can sometimes be a pain. Although the widgets are
> very nice... . It does work with WO but you do need to do a bit of
> work.
>
> HTH
>
> John
>
>
> On Fri, Sep 4, 2009 at 11:16 AM, Gustavo
> Pizano<[email protected]> wrote:
> > Hello,.. Well after almost giving up on my requirement to put more than
> one
> > column in a wobrowser to have multiple selections. I remind that before
> I
> > did some little work with EXTJS. It has what we need. a GRID
> > extjsComponent.. :D:D.. now how do I integrate WO and EXTJS?
> > In the example of grid they are loading data from an array of arrays,
> and
> > configuring "hard-coded" all the grid. How can I from the JS ask the WO
> > server for the data to congifure the grid? is it possible?..
> > another approach I saw was to generate a hidden WORepetition and generate
> > all the data, then form the JS get the element and create the grid, but
> this
> > approach I don't like it, becuase if I need another grid somewhere else I
> > have to do all again, I want to reuse code.
> > Another approach is to load the data form an xml, the same, grid has a
> url:
> > attribute I fetch the xml there, so in th backend I will need to generate
> > the xml, keep it there, while EXTJS via the url: ask for it.. what comes
> to
> > my mind are security stuff... and some theoretical stuff like:
> > How WO knows that the JS that its requesting is valid for the session in
> > the WO application?.
> > I think this is about the request-n-response loop... isn't it?
> >
> > So.. any advice... help, clue, light, code?
> > G.
> >
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