I think that the binding without the transform is the correct way to do this. You have to set it up first though. I will assume that you already have properties for Parameter_1 and Parameter_2.
- Add a custom prop to the view or coponent that this binding will be on. It must be an Array type.
- Add an array element of object type for each tag that you want to collect history for. For this example I’m assuming only 1 tag.
- Add three values to each array element they must be named ‘aggregate’, `alias’, and ‘path’.
- Set the aggregate to ‘maximum’, and the ‘alias’ to whatever you want, I wet with ‘passengers’, if you leave the alias blank the tag path will be used.
- Configure an expression binding on the path with the following expression. Note that the path to your parameters is probably different. Use the property selector to get the correct path.
'[default]P176/Passengers/Location_' + {this.custom.Parameter_1} + '_Unit_' + {this.custom.Parameter_2} + '/passengers'
The completed custom property should now look like this:
- In the expression section of the Tag History Binding select the custom prop that we just created.
