Strange behavior in Chrome

[Niels]

Hi,

I'm using the Kendo UI Diagram on a project. The project targets the Chrome browser - so I've only testet in Chrome.

Sometimes I experience a strange behavior where the entire diagram is moved when I click and hold somewhere on the diagram and move the mouse - the same way as the diagram is moved when Ctrl is held down, the mouse is clicked and held down on an empty spot and the mouse is moved. I can't select anything on the diagram or make new connections - everything is just moving around.

Sometimes I can simply close Chrome and start it again and everything is back to normal - sometimes I have to restart the computer to make the diagram work as expected.

Any idea what's going on?

 

[Niels]

And by the way - this behavior is not only in the site I'm developing. When loading an example in the browser (e.g. http://demos.telerik.com/kendo-ui/diagram/events) I'm getting the same strange behavior.

[Atanas Georgiev]

Hello Niels,

We were not able to replicate the issue locally on Chrome 40.0.2214.115 (Windows7 machine) and Chrome 43.0.2357.65 (Windows 8.1 machine). Can you please give us more details about your environment (browser version, OS version) and the actions you are undertaking before the issue occurs (editing, zooming etc.) ?

Regards,
Atanas Georgiev
Telerik

 

 

[Niels]

Hi,

I'm running Windows 8.1 and Chrome 43.0.2357.81 m. My coworker is on the same setup and we both have the issue. We haven't been able to figure out when this is happening. I noticed this behavior the first day I looked at the Kendo UI examples on your website but after restarting the browser it all seemed to work a lot better. After a few days the problem was back. Some days I have the problem and it can be resolved by restarting the browser, some days I don't have the problem and some days it requires a restart of the computer to get it back to normal.

I tend to guess it's some sort of issue on the developer machines used in this company. If you never experienced it before I will spend a little time trying the system in development on some other machines.

[Atanas Georgiev]

Hello Niels,

Thank you for your cooperation. Any information for isolating the issue will be appreciated, as this is the first report of this kind we have received,

Regards,
Atanas Georgiev
Telerik

 

 

[Niels]

Hi,

My assumption on the corporate environment was correct.

We all have the possibility to login on our workstations from home using Citrix. After a login using Citrix the described behavior can be observed. By ending the "Citrix Multi-touch Host (32 bit)" process (which first appears after a login using citrix) and the "Citrix Seamless TWI Host" process (which always runs) in the Task Manager and then restarting the browser it problem goes away until the next login from Citrix.

So simple yet so hard to figure out :-)

I guess there is nothing you can do about it - the problem must be in Citrix' end :-/

[Atanas Georgiev]

Hello Niels, 

Thank you for being so persistent in isolating the issue. Unfortunately there is nothing we can do on our side. Please drop us a line if you have any feedback on the problem from Citrix.

Regards,
Atanas Georgiev
Telerik

 

 

[frabbunz]

Hi,

I'm experiencing the same problem of Niels, also with your online demo at http://demos.telerik.com/kendo-ui/html5-diagram-sample-app

I'm implementing a diagram editor and I'm testing it with Firefox, Interner Explorer, Safari, Opera and Chrome

and only with Chrome the Diagram behave as I have the ctrl pressed.

Also selecting elements, for example, I click on them and they are selected as ctrl was pressed.

Any suggestion?

(Windows 8.1 + Chrome 47.0)

[Niels]

I guess you are using Citrix too?

Then the only solution I've found is the one above:

Stop the "Citrix Multi-touch Host (32 bit)" process and the "Citrix Seamless TWI Host" process in the Task Manager and then restart Chrome.

You'll have to do that every time you've used Citrix to control your PC.

[frabbunz]

Hi Niels,

Thank you for your reply

Yes I had it, so I tried to do the same you already did but with no luck.

Next I tried completely uninstall the Citrix suite and restarted the PC but the problem persists.
It's systematic (not random), it already happens in Chrome.

 

[Niels]

Strange. Stopping the two processes and restarting Chrome immediately solves the problem here at the office (4 different PC's).

 Sorry I can't help.

[B]

Any update on a fix for this?

I can't say for sure, but just a guess based on some similar Chrome strangeness, but I suspect this may have something to do with trying to use the control on a laptop that has a touch screen.  @Telerik can you try and do this on a touchscreen laptop to see if you can reproduce the problem:  open developer tools, switch to mobile mode, switch back to regular mode, see if it's broken.  

[Daniel]

Hi,

Yes, the current behavior of the diagram is that it allows only panning and zooming on touch devices. This was recently fixed and change will be available in the next official release.

Regards,
Daniel
Telerik