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Image thumbnail in Visual Overview not refreshing

Solved1.85K views27th January 2021video thumbnail Visio Visual Overview
3
Jochen Dewachter [SLC] [DevOps Advocate]2.16K 27th January 2021 0 Comments

I have a shape in Visual Overview that should show a thumbnail of a JPG that updates every 5 seconds. The URL stays the same, but the image changes. I'm using 'Link' shape data with the following value:

#http://<DMA IP>/VideoThumbnails/Video.htm?type=Generic Images&source=https://UrlToMyImage.com/myImage.jpg&proxy=false&refresh=5000

I see the image, but it's not refreshing. My source URL is not hard-coded like above, but comes from a parameter value. If I change the URL to something like myImage.jpg?1, it updates once. I think this is cached by the browser.

How can I properly refresh my image without having to update my parameter every 5 seconds, please?

Jochen Dewachter [SLC] [DevOps Advocate] Selected answer as best 27th January 2021

2 Answers

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Wim Bruynooghe [SLC] [DevOps Advocate]6.59K Posted 27th January 2021 1 Comment

There are a few options:

  • When the browser downloads the image, it might also receive http-headers that indicate if (and for how long) the browser is allowed to cache the file. If you have control over the http server that provides the image ("https://UrlToMyImage.com"), then it's possible to configure these http-headers.
  • If the DMA agent is able to download the image (has Internet or network access), then it's possible to put "proxy=true" in the url of the VideoThumbnails. When using the proxy, the browser will do an API call to the DMA to get the image, which the browser won't cache.
  • If the above options aren't possible, then you'll have to update the source parameter in the url manually, so that the url is different on each refresh interval.
Jochen Dewachter [SLC] [DevOps Advocate] Edited comment 27th January 2021
Jochen Dewachter [SLC] [DevOps Advocate] commented 27th January 2021

I’ll go for the proxy=true option. Thanks a lot!

1
Ruben Vandepitte [SLC] [DevOps Advocate]2.28K Posted 27th January 2021 2 Comments

There might be better solutions, but if you want a quick one:

In the Visio shape, replace the ?1 in your URL with ?[DataMinerTime]

That placeholder will updated every second. As the URL is each time unique, caching should no longer be an issue.

Note: In case 1-second updates are too fast, it's probably possible to manipulate the DateTime string trough RegexReplace in order to force a different update rate.

Jochen Dewachter [SLC] [DevOps Advocate] Posted new comment 27th January 2021
Sebastiaan Dumoulein [SLC] [DevOps Enabler] commented 27th January 2021

This is indeed a workaround for the problem but do note that this comes at a performance cost (updating the url will cause a full navigation to be done).

Jochen Dewachter [SLC] [DevOps Advocate] commented 27th January 2021

The workaround with [DataMinerTime] seems to work, but like Sebastiaan mentioned it’s not really nice for the eye. It refreshes the entire page and shows a white page for a fraction of a second…

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