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Is there any way to trigger the script on page load?

Created by: AutoGen_298806 at: 4/6/2023 2:34 PM (7 Replies)

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4/6/2023 2:34 PM	Rate (0)
AutoGen_298806 Member Joined: 2/18/2020 Last visit: 7/28/2025 Posts: 43 Rating: (0)	I'm facing a similar issue. As far as I understand from the 3.1.1 Dynamizing object properties via scripts paragraph of the SIMATIC WinCC Unified Tips and Tricks for Scripting, should be able to set the value of an IO field by the following code: export function IO_field_1_ProcessValue_Trigger(item) { var value; value = "Example"; return value; } But when I start the simulation I get the error relative to the IO Field: The configured tag is invalid. Any hint on how to solve this? Edit: I've just realized that I should set a trigger to run the script. Is there any way to trigger the script on page load? ------------------------------------------------------------------------------------------ Split from How to dynamizing object properties via scripts.
	Last edited by: AutoGen_298806 at: 04/06/2023 14:59:26 Last edited by: Jen_Moderator at: 04/09/2023 06:50:36 New subject after splitting
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4/10/2023 11:12 AM	Rate (0)
rdoliveira Gold Expert Joined: 4/26/2012 Last visit: 9/13/2025 Posts: 1645 Rating: (190)	Hello, you can do this, in the Load of the screen. Screen.FindItem("IO field_2").ProcessValue = "Example" good luck. Attachment Capturar.PNG (801 Downloads)
	"Always make a backup before performing any tests and check the best time to do so. Obrigado.
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4/17/2023 1:32 PM	Rate (0)
AutoGen_298806 Member Joined: 2/18/2020 Last visit: 7/28/2025 Posts: 43 Rating: (0)	Instead, I selected a tag of type Boolean, whose default value is set to 1 (True)

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This contribution was helpful to 1 thankful Users rdoliveira

4/17/2023 8:40 PM	Rate (0)
rdoliveira Gold Expert Joined: 4/26/2012 Last visit: 9/13/2025 Posts: 1645 Rating: (190)	AutoGen_298806 Instead, I selected a tag of type Boolean, whose default value is set to 1 (True) Hello, this for your trigger? If it worked, that's what matters. good job.
	"Always make a backup before performing any tests and check the best time to do so. Obrigado.
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4/20/2023 11:55 AM	Rate (0)
AutoGen_298806 Member Joined: 2/18/2020 Last visit: 7/28/2025 Posts: 43 Rating: (0)	Yes, since I need to trigger the Script execution as a property dynamization. Is there any other/better way? Attachment Capture.PNG (679 Downloads)

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4/20/2023 1:30 PM	Rate (0)
rdoliveira Gold Expert Joined: 4/26/2012 Last visit: 9/13/2025 Posts: 1645 Rating: (190)	Hello, the trigger, you choose, with your need, that's right. It can be by button event, when entering or leaving a screen, by tag change, etc. good job.
	"Always make a backup before performing any tests and check the best time to do so. Obrigado.
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2/7/2025 4:17 PM	Rate (0)
ErosMch1 Regular Member Joined: 6/27/2018 Last visit: 7/11/2025 Posts: 20 Rating: (0)	Hello, in this case "example" is a tag? ProcessValue is the name of the trigger? If I have (example) 10 scripts on a screen, how I can start all during the page loading? Just one cycle of the script (run 1 time each) Thank you

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2/10/2025 8:40 AM	Rate (0)
Murof Platinum Expert Joined: 8/3/2009 Last visit: 9/12/2025 Posts: 16409 Rating: (1935)	ErosMch1 Hello, in this case "example" is a tag? ProcessValue is the name of the trigger? If I have (example) 10 scripts on a screen, how I can start all during the page loading? Just one cycle of the script (run 1 time each) Thank you Hello ErosMch1 If you want to run 10 scripts at the loading of one specific screen then you can use the loaded event of the Scree: Here you can call systemfunctions of scripts as you need. If you only want to run the scripts at RuntimeStart once then you can also use a dummy start screen. Run your scripts on the loaded event and at the end call your startscreen with your content. If this actions takes a few seconds (I had this also in a project) you can show some kind of progress bar or loading icon. Bye Murof
	If this Information really helps, you could use the Rate function
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This contribution was helpful to 1 thankful Users rdoliveira

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