CodeSys Webvisu Refresh, Dynamic Image? - PLCS.net

Kidder · June 21st, 2019, 02:50 PM

How can I trigger the web browser to refresh based on a variable? ie when I receive a new image have FF / Chrome refresh.

What I'm trying to do is display a new image from a vision system in the webvisu. The only way I found so far is to delete the original the image from the image pool in the visu folder, then name the new image what the old image name was and then refresh the browser.

It's not the best solution but I can't figure out a way to dynamically change the image pool properly.

I've also tried using the webbrowser element and just change the link to the displayed image but for some reason when using the webbrowser element the popup keyboard inputs start messing up.

Maxkling · June 21st, 2019, 03:42 PM

Is this an issue with the browser caching the image?

If so, you usually add a date parameter or any random number to the end of the image name. You can see this anytime there is a ?= after the file extension.

Kidder · June 21st, 2019, 04:15 PM

I guess browser caching the image is possible but I have the image pool set to "reload the file automatically" when it changes.

Not sure how to add "?=xxx" to the image pool on the fly.

I've also tried with two images in the pool. So display image 1 and the switch to image 2 (which works) then change image 1 to the updated image and then switch back to image 1 but the old image is still displayed.

Maxkling · June 21st, 2019, 09:51 PM

I have no experience with Webvisu, but I use a macro in excel that saves graphs and charts as an image to an image folder in IIS. The webpage will refresh images based on a polling timer. I went all around trying to figure out why the images wouldn’t update. Turns out the browser was caching the images, I tried every no cache code on the HTML and JavaScript side and nothing worked. I stumbled on a thread about adding a parameter to the end of the image name and it worked after that.

shooter · June 25th, 2019, 09:23 AM

there is a setting for this, please use the PLC as browser.

Kidder · June 26th, 2019, 11:50 AM

Thanks for the suggestions. I finally figured it out.

By putting the image pool in the bitmap ID variable, ie Image_Pool.1, then copying the new image to replace the Image_Pool.1 original image, and then incrementing an int in the dynamic bitmap variable it now changes the image without having to refresh the browser.

June 21st, 2019, 02:50 PM	#1
Kidder Member Join Date: Jan 2019 Location: Tucson Posts: 4	CodeSys Webvisu Refresh, Dynamic Image? How can I trigger the web browser to refresh based on a variable? ie when I receive a new image have FF / Chrome refresh. What I'm trying to do is display a new image from a vision system in the webvisu. The only way I found so far is to delete the original the image from the image pool in the visu folder, then name the new image what the old image name was and then refresh the browser. It's not the best solution but I can't figure out a way to dynamically change the image pool properly. I've also tried using the webbrowser element and just change the link to the displayed image but for some reason when using the webbrowser element the popup keyboard inputs start messing up.

June 25th, 2019, 09:23 AM	#5
shooter Member Join Date: Sep 2002 Location: duketown Posts: 2,711	there is a setting for this, please use the PLC as browser. __________________ shooter@home.nl skype shooter paul.deelen Computer Shooter Paul Deelen J. Wassenaerstraat 29 NL 5224 GG 's-Hertogenbosch +31653300739

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June 21st, 2019, 03:42 PM	#2
Maxkling Member Join Date: Mar 2011 Location: Atlanta Posts: 508	Is this an issue with the browser caching the image? If so, you usually add a date parameter or any random number to the end of the image name. You can see this anytime there is a ?= after the file extension.

June 21st, 2019, 04:15 PM	#3
Kidder Member Join Date: Jan 2019 Location: Tucson Posts: 4	I guess browser caching the image is possible but I have the image pool set to "reload the file automatically" when it changes. Not sure how to add "?=xxx" to the image pool on the fly. I've also tried with two images in the pool. So display image 1 and the switch to image 2 (which works) then change image 1 to the updated image and then switch back to image 1 but the old image is still displayed.

June 21st, 2019, 09:51 PM	#4
Maxkling Member Join Date: Mar 2011 Location: Atlanta Posts: 508	I have no experience with Webvisu, but I use a macro in excel that saves graphs and charts as an image to an image folder in IIS. The webpage will refresh images based on a polling timer. I went all around trying to figure out why the images wouldn’t update. Turns out the browser was caching the images, I tried every no cache code on the HTML and JavaScript side and nothing worked. I stumbled on a thread about adding a parameter to the end of the image name and it worked after that.

June 26th, 2019, 11:50 AM	#6
Kidder Member Join Date: Jan 2019 Location: Tucson Posts: 4	Thanks for the suggestions. I finally figured it out. By putting the image pool in the bitmap ID variable, ie Image_Pool.1, then copying the new image to replace the Image_Pool.1 original image, and then incrementing an int in the dynamic bitmap variable it now changes the image without having to refresh the browser.

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