Passing Default Values Through the URL with Webform
We're using the webform module on the Arts & Sciences Computing web site for the classroom reservation page (among others). There is a selection of radio buttons to choose which classroom you wish to reserve, but we thought it would be wonderful if, on each classroom page, there was a link to the effect of 'Reserve this Classroom' and that the correct classroom would already be selected for the user.
We can accomplish this by passing the room value through the URL. First, set the default value for the room select field to '%get[room]' with 'room' being the name of the parameter. Then, access the page with a URL that looks like 'http://example.com/node/18?room=eads_004'. Where 'room' is the parameter name and 'eads_004' is the value of the radio button to which you wish to default.