Function setActiveTabIndex

setActiveTabIndex(tabIndex): void
JMap.Form.setActiveTabIndex

Set the active tab index.

Works only for attribute form that have at least one external form.

Index starts at 0 (attribute form), 1 (first external form), etc...

Use JMap.Form.hasDisplayedForm to know if a form is currently displayed.
Parameters
- tabIndex: number
  the tab index
Returns void
Throws
if no layer is displayed, if index is invalid.

Example
```
if (JMap.Form.hasDisplayedForm()) {
 // reset currently displayed form values
 JMap.Form.setActiveTabIndex(1)
 ...
}
```