//**Autocomplete support to MARC21 catalogue**//  
$(document).ready(function(){
 $( '[id^="tag_260_subfield_a"]' ).autocomplete({
    source: function(request, response) {
      $.ajax({
        url: "/cgi-bin/koha/cataloguing/ysearch.pl",
        dataType: "json",
        data: {
          term: request.term,
          table: "biblioitems",
          field: "place"
        },
        success: function(data) {
          response( $.map( data, function( item ) {
            return {
              label: item.fieldvalue,
              value: item.fieldvalue
            };
          }));
        }
      });
    },
    minLength: 1,
  });

 $( '[id^="tag_020_subfield_a"]' ).autocomplete({
    source: function(request, response) {
      $.ajax({
        url: "/cgi-bin/koha/cataloguing/ysearch.pl",
        dataType: "json",
        data: {
          term: request.term,
          table: "biblioitems",
          field: "ISBN"
        },
        success: function(data) {
          response( $.map( data, function( item ) {
            return {
              label: item.fieldvalue,
              value: item.fieldvalue
            };
          }));
        }
      });
    },
    minLength: 1,
  });
  
  $( '[id^="tag_260_subfield_b"]' ).autocomplete({
    source: function(request, response) {
      $.ajax({
        url: "/cgi-bin/koha/cataloguing/ysearch.pl",
        dataType: "json",
        data: {
          term: request.term,
          table: "biblioitems",
          field: "publishercode"
        },
        success: function(data) {
          response( $.map( data, function( item ) {
            return {
              label: item.fieldvalue,
              value: item.fieldvalue
            };
          }));
        }
      });
    },
    minLength: 1,
  });

 $( '[id^="tag_250_subfield_a"]' ).autocomplete({
    source: function(request, response) {
      $.ajax({
        url: "/cgi-bin/koha/cataloguing/ysearch.pl",
        dataType: "json",
        data: {
          term: request.term,
          table: "biblioitems",
          field: "Editionstatement"
        },
        success: function(data) {
          response( $.map( data, function( item ) {
            return {
              label: item.fieldvalue,
              value: item.fieldvalue
            };
          }));
        }
      });
    },
    minLength: 1,
  });
});

Click Save Button.

Step - 2

Go to : Home/Cataloging/New Record (Enter the all bibliographies details )


References:

[1] http://www.loc.gov/catworkshop/RDA%20training%20materials/LC%20RDA%20Training/Module1IntroManifestItemsSept12.doc

[2] https://developer.mozilla.org/en-US/docs/AJAX/Getting_Started

[3] https://gist.github.com/l2c2technologies/7d0449dcb80c90880381ef4571003d1d

[4] http://catb.org/jargon/html/H/hack.html

[5] http://blog.l2c2.co.in/index.php/2017/01/15/adding-autocomplete-support-to-marc21-260-264-imprint-fields-in-koha/