How to print recto verso with acrobat javascript?

we use acrobat javascript print documents when opened via link. in pdf added javascript like

 

var pp = this.getprintparams();

 

--here add parameters interactive etc...

 

this.print(pp);

 

 

i know lines have put between getprintparams , print(pp) make document print in recto verso?

 

kr

 

peeteko

i @ "duplextype" value of "constants" property of "printparams" object.

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