Whenever a vacancy occurs or exists in the office of a full-time district judge while the General Assembly is in session, or whenever the term of a full-time judge of a district court will expire or the office will be vacated at a date certain between the adjournment of the General Assembly and the commencement of the next session of the General Assembly, a successor judge may be elected at any time during a session preceding the date of such vacancy, by the vote of a majority of the members elected to each house of the General Assembly, for a full term of six years and, upon qualification, the successor judge shall enter at once upon the discharge of the duties of his office. However, such successor judge shall not enter upon the discharge of his duties prior to the commencement of his term of office. No person shall be elected or reelected to a subsequent term under this section until he has submitted to a criminal history record search and submitted to a search of the central registry maintained pursuant to § 63.2-1515 for any founded complaint of child abuse or neglect and reports of such searches have been received by the Chairmen of the House and Senate Committees for Courts of Justice. If the person has not met the requirement of filing in the preceding calendar year a disclosure form prescribed in § 2.2-3117 or 30-111, he shall also provide a written statement of economic interests on the disclosure form prescribed in § 2.2-3117 to the Chairmen of the House and Senate Committees for Courts of Justice.