Here is a nice, concise statement of how the Illinois Appellate Court reviews the personal jurisdiction of the trial court.
When the trial court decides a jurisdictional question solely on the basis of documentary evidence and without an evidentiary hearing, as it did here, then the question is reviewed de novo on appeal. Rosier v. Cascade Mountain, Inc., 367 Ill.App.3d 559, 561, 305 Ill.Dec. 352, 855 N.E.2d 243 (2006). On appeal, any conflicts in the pleadings and affidavits must be resolved in the plaintiff’s favor. MacNeil v. Trambert, 401 Ill.App.3d 1077, 1080, 342 Ill.Dec. 314, 932 N.E.2d 441 (2010). “However, well-alleged facts within affidavits presented by the defendant must be taken as true notwithstanding the existence of contrary averments in the plaintiff’s pleadings unless the defendant’s affidavits are contradicted by affidavits presented by the plaintiff, in which case the facts in the plaintiff’s affidavits prevail.” Keller v. Henderson, 359 Ill.App.3d 605, 611, 296 Ill.Dec. 125, 834 N.E.2d 930 (2005). If we determine that plaintiff has made a prima facie case for jurisdiction, we must then determine if there exist any material evidentiary conflicts. Id. If a material evidentiary conflict exists, we must remand the cause for an evidentiary hearing. Id.