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AVEVA™ Historian

SelectedTag

  • Last UpdatedJan 25, 2024
  • 1 minute read

The SelectedTag method gets the selected tag as identified by the index.

Syntax

[aaTag=] aaHistClientTagPicker.SelectedTag(integer index);

Parameters

index

The numerical identifier for the tag. The identifier is zero-based.

Return Value

Returns the tag or, if it is out of bounds, returns NULL. (It does not return a NULL string.)

Remarks

This method works in conjunction with the SelectedTagCount property.

Example

The following InTouch HMI software example gets all of the selected tags using a loop:

DIM i AS INTEGER;

DIM count AS INTEGER;

Count = #aaHistClientTagPicker3.SelectedTagCount;

FOR i = 0 TO count - 1

%ReturnTag = #aaHistClientTagPicker3.SelectedTag( i );

NEXT;

In this example, Count is the number of tags and is retrieved using the SelectedTagCount property.

The index passed to the SelectedTag() method ranges from 0 to
Count - 1. For example:

  • If the Count was 0, there are no tags selected.

  • If Count is 1, there is one tag selected, and its index is 0.

  • If Count is 5, there are 5 tags, and the indices range from 0 to 4.

Therefore, you must first check to see that Count is not 0 and then you can index appropriately to get the tag.

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