Upon motion, trial may be postponed or continued in the discretion of the court, and shall be allowed upon a showing of good cause established by affidavit or other evidence. The court may award such costs as will reimburse the other parties for their actual expenses incurred from the delay. A motion to postpone the trial on account of the absence of evidence can be made only upon affidavit, showing the materiality of the evidence expected to be obtained, and that due diligence has been used to obtain it; and where the evidence may be; and if it is for an absent witness, the affidavit must show the name and residence of the witness, if known, and the probability of procuring the testimony within a reasonable time, and that his absence has not been procured by the act or connivance of the party, nor by others at his request, nor with his knowledge and consent, and what facts he believes to be true, and that he is unable to prove such facts by any other witness whose testimony can be as readily procured. If, thereupon, the adverse party will consent that, on the trial, the facts shall be taken as true if the absent evidence is written or documentary, and, in case of a witness, that he will testify to said facts as true, the trial shall not be postponed for that cause, and in such case, the party against whom such evidence is used, shall have the right to impeach such absent witness, as in the case where the witness is present, or his deposition is used.