3. Summary

Manipulating the view state via JavaScript can be quite overwhelming. The following table illustrates the differences between various scenarios.

The table below assumes that some view state has been set via JavaScript after a page load to a view state field.

View State Condition	Runtime.viewState	sessionStorage	localStorage
Persisted on browser refresh (F5)	No	Yes	Yes
Persisted on WEM application event	Yes	Yes	Yes
Removed when the widget is unloaded	Yes	Depends	Depends
Removed when the browser tab is closed	Yes	Yes	No
Removed when the browser is closed	Yes	Yes	No
Removed when your computer is hit by a meteor	Yes	Yes	Yes

In the case of a widget being unloaded, there are two scenarios where the outcome depends on specific conditions. As discussed in the previous chapter, we have the option to manually clear the state of localStorage and sessionStorage in the unloadscript block (see WEMScript Script Blocks).