Question for Vision Dropdown List

Ignition
1

Hi,
I used a dropdown list in a template. But once I selected one in a window, the selection would keep in any window I opened using this template. I searched on the forum, the suggestion was that we can set the selectedIndex of this component. But where I can write this code using python script.
Each window I opened would keep my last selection, the screen was as below:
image
In my experience of web development, I never met such question, my question is that how to display the first row not my selection on other window when I open a window.Below is my expected affect.
image

2

Edit: I’m assuming you’re talking about Vision since you mentioned you made it in a Template.

Not sure what you plan to do with this component, but usually you would bidirectionally bind one of the selected properties (selectedIndex or selectedLabel) to a tag.
If you don’t want to bind it but want it to reset, you can set the selectedIndex property by executing a script on the component’s property change event handler, specifically on change of its ‘componentRunning’ property.

If event.propertyName == 'componentRunning':
     event.source.selectedIndex = 0
3

Thanks for your help. It works very well.

4

Hi , Nminchin
I define a dataset which gets selection items from a database,but it often throws an exception of "0 out of bounds’.I guess that’s because the dataset is null before the script executes.Do you know why this happens and how I can solve this issue?

5

Hmm, what if you change the if condition to use data instead of componentRunning?

6

or wrap it in try: ... except: ... to just ignore the error

1 Like
7

Thank you all. Now, I adopted Sanderd17’s suggestion to solve the problem.

8

Hi,

I have a similar problem. I created a template with dropdown list ( but I have other properties binding in Data and SelectedValue, that I need to show some options), and I note that when I close the gateway (for now is Trial version) or restart de computer, the values don’t remain with the last choice, return to ** < SelectOne > **
I tried create a custom property to write this value …exist one way to fixed the last choice?
Thanks.
Vision version 8.1

9

Properties are not persistent outside the client session. To make something persistent, bind to a gateway memory tag. Note that this also makes it shared for all clients. If you need individual persistence, you will need to construct something custom with a database, keyed by user.

1 Like