The +1 API documentation is here: http://code.google.com/apis/+1button/#jsapi
There is no mention of how to determine whether the viewing user has already clicked the button or not. This would be a very useful function because it would allow me to encourage people who haven t +1 d a page to do so without putting users who have already +1 d the page through a needless and possibly confusing step.
Has anyone found a way to do this? Thanks
There is callback attribute, which allows you to add custom callback function, which can react to +1 or -1. See http://www.odditysoftware.com/blog/trap-and-track-google-plus-button-click-events_45.html
But your question is old, maybe it wasn t present yet.
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