# Passing a callback to ScriptObject.Invoke **URL:** \ **Category:** IronRuby\ **Created:** [August 22, 2008, 8:07pm UTC](https://www.ruby-forum.com/t/passing-a-callback-to-scriptobject-invoke/146597 "2008-08-22T20:07:09Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![Sean\_CSHess](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/94ad74/32.png) [@Sean\_CSHess](https://www.ruby-forum.com/u/Sean_CSHess)\ **Post date:** [August 22, 2008, 8:07pm UTC](https://www.ruby-forum.com/t/passing-a-callback-to-scriptobject-invoke/146597/1 "2008-08-22T20:07:09Z")
Hi everybody, I’m plugging in to an existing javascript library using invoke. I can successfully call my\_js\_object.invoke and get it to call different functions. They implemented a function called Observe that accepts a callback (event system). How can I tie in to javascript events with ruby? I can pass values, like js\_object.invoke “Observe”,“EventName”, but it doesn’t really work to put a block as the last (the callback) parameter. Any ideas? How can I do this? Thanks ~sean ---
**Author:** ![Sean\_CSHess](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/94ad74/32.png) [@Sean\_CSHess](https://www.ruby-forum.com/u/Sean_CSHess)\ **Post date:** [August 22, 2008, 10:24pm UTC](https://www.ruby-forum.com/t/passing-a-callback-to-scriptobject-invoke/146597/2 "2008-08-22T22:24:55Z")
sure, I’ll cook one up really quick On Fri, Aug 22, 2008 at 2:21 PM, Tomas M. \< ---
**Author:** ![Sean\_CSHess](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/94ad74/32.png) [@Sean\_CSHess](https://www.ruby-forum.com/u/Sean_CSHess)\ **Post date:** [August 22, 2008, 10:23pm UTC](https://www.ruby-forum.com/t/passing-a-callback-to-scriptobject-invoke/146597/3 "2008-08-22T22:23:09Z")
Can you send a small example of what you’re trying to do? Is it browser native JavaScript or managed DLR JScript? Tomas From: removed\_email\_address@domain.invalid [[mailto:removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)] On Behalf Of Sean C. Hess Sent: Friday, August 22, 2008 11:06 AM To: removed\_email\_address@domain.invalid Subject: [Ironruby-core] Passing a callback to ScriptObject.Invoke Hi everybody, I’m plugging in to an existing javascript library using invoke. I can successfully call my\_js\_object.invoke and get it to call different functions. They implemented a function called Observe that accepts a callback (event system). How can I tie in to javascript events with ruby? I can pass values, like js\_object.invoke “Observe”,“EventName”, but it doesn’t really work to put a block as the last (the callback) parameter. Any ideas? How can I do this? Thanks ~sean ---
**Author:** ![Sean\_CSHess](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/94ad74/32.png) [@Sean\_CSHess](https://www.ruby-forum.com/u/Sean_CSHess)\ **Post date:** [August 22, 2008, 10:43pm UTC](https://www.ruby-forum.com/t/passing-a-callback-to-scriptobject-invoke/146597/4 "2008-08-22T22:43:40Z")
Ok, I put the following in index.html in a blank ruby dynamic silverlight project [http://pastie.textmate.org/258247](http://pastie.textmate.org/258247) This is a really simple event system, with only one event, one listener… etc. It has a default handler you can trigger by clicking the link. Then, here is app.rb [http://pastie.textmate.org/258249](http://pastie.textmate.org/258249) Uncomment line 10 to see that you have a handle on the js object. Line 11, however, throws an error no matter what I do. Basically, I want to be able to pass a block of ruby code to be executed whenever the javascript function is called. I know I can use the HTML stuff to listen for a click directly, but I’m trying to plug into a js system that dispatches events this way, so I can’t change the js interface. Thanks for your help, and let me know if you have any more questions. ~sean ---
**Author:** ![Sean\_CSHess](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/94ad74/32.png) [@Sean\_CSHess](https://www.ruby-forum.com/u/Sean_CSHess)\ **Post date:** [August 26, 2008, 1:33am UTC](https://www.ruby-forum.com/t/passing-a-callback-to-scriptobject-invoke/146597/5 "2008-08-26T01:33:20Z")
Sean, I’ll make sure to get back to you. I can run a ruby block given a Javascript event, but I’ll cook up a app that does what you ask shortly. Let me know if this is urgent, and I’ll do it faster =) On 8/22/08 1:42 PM, “Sean C. Hess” [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: Ok, I put the following in index.html in a blank ruby dynamic silverlight project [http://pastie.textmate.org/258247](http://pastie.textmate.org/258247) This is a really simple event system, with only one event, one listener… etc. It has a default handler you can trigger by clicking the link. Then, here is app.rb [http://pastie.textmate.org/258249](http://pastie.textmate.org/258249) Uncomment line 10 to see that you have a handle on the js object. Line 11, however, throws an error no matter what I do. Basically, I want to be able to pass a block of ruby code to be executed whenever the javascript function is called. I know I can use the HTML stuff to listen for a click directly, but I’m trying to plug into a js system that dispatches events this way, so I can’t change the js interface. Thanks for your help, and let me know if you have any more questions. ~sean On Fri, Aug 22, 2008 at 2:23 PM, Sean C. Hess [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: sure, I’ll cook one up really quick On Fri, Aug 22, 2008 at 2:21 PM, Tomas M. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: Can you send a small example of what you’re trying to do? Is it browser native JavaScript or managed DLR JScript? Tomas From: removed\_email\_address@domain.invalid [[mailto:removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)] On Behalf Of Sean C. Hess Sent: Friday, August 22, 2008 11:06 AM To: removed\_email\_address@domain.invalid Subject: [Ironruby-core] Passing a callback to ScriptObject.Invoke Hi everybody, I’m plugging in to an existing javascript library using invoke. I can successfully call my\_js\_object.invoke and get it to call different functions. They implemented a function called Observe that accepts a callback (event system). How can I tie in to javascript events with ruby? I can pass values, like js\_object.invoke “Observe”,“EventName”, but it doesn’t really work to put a block as the last (the callback) parameter. Any ideas? How can I do this? Thanks ~sean ---
**Author:** ![Sean\_CSHess](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/94ad74/32.png) [@Sean\_CSHess](https://www.ruby-forum.com/u/Sean_CSHess)\ **Post date:** [August 26, 2008, 3:42am UTC](https://www.ruby-forum.com/t/passing-a-callback-to-scriptobject-invoke/146597/6 "2008-08-26T03:42:37Z")
Really? That would be awesome. Realize though, that I need it to work for custom callbacks, not for any standard ha event. Thanks! Yeah, we kind if tabled the project because it was taking so long, but I’d love to know the answer On Aug 25, 2008, at 5:32 PM, Jimmy S. \