Hello Jianxia,
Viewing the source web map for our Web App Builder app in the ArcGIS Online Map Viewer, when I enter the address "1800 27TH ST" and press the Enter key on the keyboard, a list of candidates is not returned. Instead the Search widget selects the best candidate and then zooms to that location on the map. With the Map Viewer, the best candidate is being selected and used by the Search Widget.
In contrast, with the Web App, the list of candidates for an address is returned. But, after the July 2015 AGOL update, I can no longer select the first address from the returned list of candidates.
Will Rice