Tim, Thank you very much for the suggestion.
Using the example of wheel event capture at http://adomas.org/javascript-mouse-wheel/ I made a test script for capturing mouse wheel "clicks" (ie, each scroll segment or movement of the wheel) that only records "civilised" mouse wheel movements. So if the user goes too fast, the mouse wheel "click" is ignored. In the attached example, I set the interval to 0.3 seconds. Please see attached example. Please do make suggestions on how this might be improved. I plan to implement this functionality into both the wheel events of MouseDefaults.js, as well as the code that handles the slider on the zoombar. Cheers, Mike Quentel -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Tim Schaub Sent: Wednesday, 28 November 2007 12:15 To: [email protected] Subject: Re: [OpenLayers-Users] intercepting mouse events that are too rapid in succession Hey- Michael Quentel wrote: > Via OpenLayers (or other javascript means), any ideas on how to > intercept mouse events that are "too rapid" in succession? You'd have to customize the event handling code to set timers (window.setTimeout) and only respond to a limited set of events. > > For example, if someone uses a mouse wheel too fast, it would be nice > to intercept the movements, then submit the net result to the server, > rather than submitting each event that has occurred. Reason why this > is of concern is that some server-side mapping applications are prone > to fail if too many requests are made in rapid succession. Yeah, we'd be better off if mouse wheeling just did a "transition effect" or "animated zooming" on the client side - not issuing requests until after scrolling finished (after some delay with no more wheel events). The easiest way to modify this behavior right now would be to override this function: OpenLayers.Handler.MouseWheel.prototype.onWheelEvent Basically, you'd want to duplicate the existing code, but execute it with a window.setTimeout, accruing the wheel delta somewhere (on the handler) and canceling previous timers when you got a new event. All this is a bit ugly - and without animated zooming the user will get no response until they stop scrolling - but it will give your server a break. Good luck, Tim > I am not using a popular off-the-shelf map server; nor am I using an > open source map server. Please, any advice on intercepting the net > result of mouse events is appreciated. > > Many thanks. > > Mike Quentel > > --------------------------------------------------------------------- > This transmission (including any attachments) may contain confidential information, privileged material (including material protected by the solicitor-client or other applicable privileges), or constitute non-public information. Any use of this information by anyone other than the intended recipient is prohibited. If you have received this transmission in error, please immediately reply to the sender and delete this information from your system. Use, dissemination, distribution, or reproduction of this transmission by unintended recipients is not authorized and may be unlawful. > _______________________________________________ > Users mailing list > [email protected] > http://openlayers.org/mailman/listinfo/users > > !DSPAM:4033,474c95ea292781804284693! > _______________________________________________ Users mailing list [email protected] http://openlayers.org/mailman/listinfo/users --------------------------------------------------------------------- This transmission (including any attachments) may contain confidential information, privileged material (including material protected by the solicitor-client or other applicable privileges), or constitute non-public information. Any use of this information by anyone other than the intended recipient is prohibited. If you have received this transmission in error, please immediately reply to the sender and delete this information from your system. Use, dissemination, distribution, or reproduction of this transmission by unintended recipients is not authorized and may be unlawful.Title: wheeltest4.htm
Scroll mouse wheel to see delta here.
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