It would appear that there is not yet a Visual Logic block for this.
The ogScript is pretty simple:
params.setAllValues(OID, [""]); (for a string parameter);
params.setAllValues(OID, [0]); (for a numeric parameter);
If you want to still make this available in Visual Logic, you can do put an <api/> tag at the top of your file and write a simple function in it:
<api>
function clearParameter(oid)
{
params.setAllValues(oid, [""]);
}
</api>
You should then see "clearParameter" appear in Visual Logic under "API Functions" on the right side.
#DashBoard