Hello all,

How do I register a Pascal method as callback function for an jQuery Mobile callback?

In JavaScript I can use this syntax:

$("#elementid").on("pagehide", function(event, ui){ alert("Event fired");});

Is there any method to do this in Pascal without creating an external class for the jQuery object $("#elementid")?

Regards
Simon Ameis

Several ways, but
TJSOBject(JQuery('#elementid'))['onhide';
should work.

Michael.

Michael Van Canneyt wrote

Several ways, but TJSOBject(JQuery('#elementid'))['onhide';  should work.

Thanks for the hint to the libjquery unit. This helps to resolve $('#elementid').

However I couldn't find any information on how to access the non-standard events via attributes. Thus I create an external class just for the "on" method.

See above.

Either you declare an external class, or you typecast to TJSObject (the generic Object from javascript) and use the standard 'properties' array.

There is no other way.

The web unit contains a declaration for most HTML elements. if the events you need are standard HTML elements, the TJSHTMLElement class or one of its descendents are all you need. if the event is a custom event, then you need either an external class or the above.

Given that pascal is supposed to be type safe, I would always go for the external classes approach. It has the additional advantage that the lazarus code completion will create a handler of the correct signature for you.

i.e.
TYourOnject(JQuery('#elementid'));
with the cursor on @mymethod, invoking code completion (CTRL-SHIFT-C) will create the method for you with the correct signature. Saves typing, and you know your handler is correct.

Michael.