Issue Javascript command from Wicket

[Watter <ma...@welchkin.net>]

I'm sure this is probably rather simple, but what would be the best way to
issue a javascript command from a wicket action?

That's vague so here's a more specific example. I have an existing app that
has a button. When that button is clicked, the event is handled by Wicket to
perform some action like save something to the database. I now have a new
requirement that says that in addition to what was previously occurring, I
also need to execute some javascript when that button is clicked. The exact
javascript that needs to be executed is dependent upon what happens during
the server side handling of the button click so I can't just statically add
something to the onclick handler of the HTML button.

Is there a best practice for this? Handling the button click with Ajax
perhaps and some kind of callback parameter?


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Re: Issue Javascript command from Wicket

[Watter <ma...@welchkin.net>]

Michael O'Cleirigh wrote:
> 
>   You can use the AjaxRequestTarget to emit javascript back to the 
> browser like this:
> 
> target.prependJavascript("alert('sent from the server');");
> 
> Typically you would have placed the javascript method definitions into 
> the page so they would exist already in the browsers DOM and then you 
> would just emit specific calls to them in the action itself.
> 
> e.g.
> 
> target.prependJavascript("processCase("+case+");");
> 

Thanks! I really should have known this as I've done something similar
before. I don't know why I was drawing a blank on this.

-Matt

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Re: Issue Javascript command from Wicket

[Michael O'Cleirigh <mi...@rivulet.ca>]

  You can use the AjaxRequestTarget to emit javascript back to the 
browser like this:

target.prependJavascript("alert('sent from the server');");

Typically you would have placed the javascript method definitions into 
the page so they would exist already in the browsers DOM and then you 
would just emit specific calls to them in the action itself.

e.g.

target.prependJavascript("processCase("+case+");");

Regards,

Mike

> I'm sure this is probably rather simple, but what would be the best way to
> issue a javascript command from a wicket action?
>
> That's vague so here's a more specific example. I have an existing app that
> has a button. When that button is clicked, the event is handled by Wicket to
> perform some action like save something to the database. I now have a new
> requirement that says that in addition to what was previously occurring, I
> also need to execute some javascript when that button is clicked. The exact
> javascript that needs to be executed is dependent upon what happens during
> the server side handling of the button click so I can't just statically add
> something to the onclick handler of the HTML button.
>
> Is there a best practice for this? Handling the button click with Ajax
> perhaps and some kind of callback parameter?
>
>


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