JavaScript for making sequential number field generate new number on printing

Can you tell me how to edit this script to generate the new number upon printing? Currently it changes on saving and opening.

var f = this.getField("Tracking Number");if (f.value=="") f.value = "0001";else f.value = util.printf("%04d", (Number(f.value)+1));

Thank you!

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Community Expert

Move the code to the Will Print event of the document, under Tools - JavaScript - Set Document Actions.

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