Autocomplete functionality on JSPUI advanced search form

...
<%
 //Add this code on top section
 //Generate JSPUI Solr path url
 String scheme = request.getScheme();             // http
 String serverName = request.getServerName();     //request.getServerName();     // hostname.com
 int serverPort = request.getServerPort();        // 80
 String parentContextPath = "";                   //Change this value if dspace not installed on html root folder
 String contextPath = "/jspui";
 String servletPath = "/searchJSON";
 // Reconstruct original requesting URL
 StringBuffer url =  new StringBuffer();
 url.append(scheme).append("://").append(serverName);
 if (serverPort != 80)
 url.append(":").append(serverPort);
 url.append(parentContextPath).append(contextPath).append(servletPath);
 String solrPath = url.toString();

%>
...

<dspace:layout locbar="nolink" titlekey="jsp.search.advanced.title" scriptaculous="off" jquery="on">
<script type="text/javascript" src="<%=request.getContextPath()%>/static/js/autocomplete.js"></script>
<script type="text/javascript">
window.onload = function() {
   monkeyPatchAutocomplete();
   replaceSAXExpression('<%=solrPath %>', 10,'tfield1', 'tquery1');
   replaceSAXExpression('<%=solrPath %>', 10,'tfield2', 'tquery2');
   replaceSAXExpression('<%=solrPath %>', 10,'tfield3', 'tquery3');
}
</script>
...
<!-- Add id field and onchange event call for every search combobox, add id field on search textbox too-->
<select name="field1" id="tfield1" onchange="JavaScript:replaceSAXExpression('<%=solrPath%>', 10 ,'tfield1', 'tquery1');">
<input type="text" name="query1" id="tquery1" value="<%=StringEscapeUtils.escapeHtml(query1)%>" size="30" />
...
<select name="field2" id="tfield2" onchange="JavaScript:replaceSAXExpression('<%=solrPath%>', 10 ,'tfield2', 'tquery2');">
<input type="text" name="query2" id="tquery2" value="<%=StringEscapeUtils.escapeHtml(query2)%>" size="30"/>
...
<select name="field3" id="tfield3" onchange="JavaScript:replaceSAXExpression('<%=solrPath%>', 10 ,'tfield3', 'tquery3');">
<input type="text" name="query3" id="tquery3" value="<%=StringEscapeUtils.escapeHtml(query3)%>" size="30"/>

/**
 * Functions used on advanced search page
 */
function monkeyPatchAutocomplete() {
    // don't really need this, but in case I did, I could store it and chain
    var oldFn = $.ui.autocomplete.prototype._renderItem;

    $.ui.autocomplete.prototype._renderItem = function( ul, item){
    	var term = this.term.split(' ').join('|');
    	var re = new RegExp("(" + term + ")", "gi") ;
    	var t = item.label.replace(re,"<b>$1</b>");
    	return $( "<li></li>" )
    	.data( "item.autocomplete", item )
    	.append( "<a>" + t + "</a>" )
    	.appendTo( ul );
    };

}

function replaceSAXExpression(baseUrl , limit ,fieldName, fieldText){
	var field = $('#'+ fieldName).val();
	$('#' + fieldText).val('');
	$('#' + fieldText).autocomplete({
		source: function( request, response ) {
			$.ajax({
				url: baseUrl +"/terms?terms=true&terms.limit=" + limit + "&terms.sort=count&terms.regex.flag=case_insensitive&terms.fl=" + field + "&terms.regex=.*" + request.term + ".*&wt=json",
				dataType: "json",
				data: {
					style: "full",
					maxRows: 5,
					name_startsWith: request.term,
				},
				success: function( data ) {
 					response( $.map( data.terms[field], function( item ) {
						if(!$.isNumeric(item)){
							return{
    							label: item,
    							value: "\"" + item + "\"",
         					}
         				}else {
         					return null;
         				}
         			}
				));}
			});
		},
		minLength: 1,
		select: function( event, ui ) {

		},
		open: function() {
			$( this ).removeClass( "ui-corner-all" ).addClass( "ui-corner-top" );
		},
		close: function() {
			$( this ).removeClass( "ui-corner-top" ).addClass( "ui-corner-all" );
		}
	});
}

package org.dspace.app.webui.servlet;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLConnection;
import java.sql.SQLException;

import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.xml.transform.stream.StreamResult;

import org.apache.log4j.Logger;
import org.dspace.authorize.AuthorizeException;
import org.dspace.core.Context;

public class SearchJSONServlet extends DSpaceServlet
{
 private static final long serialVersionUID = 1L;
 /** log4j category */
 private static Logger log = Logger.getLogger(SearchJSONServlet.class);

 /**
 * Create an DSpaceServlet Servlet
 */
 public SearchJSONServlet()
 {
 super();
 }

 protected void doDSPost(Context context, HttpServletRequest request,
 HttpServletResponse response) throws ServletException, IOException,
 SQLException, AuthorizeException
 {
 doDSGet(context, request, response);
 }

 protected void doDSGet(Context context, HttpServletRequest request,
 HttpServletResponse response) throws ServletException, IOException,
 SQLException, AuthorizeException
 {
 String pathString = request.getPathInfo();
 String queryString = request.getQueryString();

 //Build localhost solr query path
 String scheme = request.getScheme();             // http
 String serverName = "127.0.0.1";                 // Solr can only be accessed from localhost
 int serverPort = request.getServerPort();        // 80

 String contextPath = "/solr";
 String servletPath = "/searchJSPUI";
 String parentContextPath = "";                  //Change this value if your dspace installation is not on base web server directory
 StringBuffer url =  new StringBuffer();
 url.append(scheme).append("://").append(serverName);
 if (serverPort != 80)
 url.append(":").append(serverPort);
 url.append(parentContextPath).append(contextPath).append(servletPath);
 url.append(pathString + "?");
 url.append(queryString);
 String solrPath = url.toString();

 //Get response from solr server and send it as servlet reponse
 StringBuilder jsonResponse = new StringBuilder();
 URL sorlURL = new URL(solrPath);
 URLConnection solrConnection = sorlURL.openConnection();
 BufferedReader in = new BufferedReader(new InputStreamReader(solrConnection.getInputStream()));
 String inputLine;
 while ((inputLine = in.readLine()) != null)
 jsonResponse.append(inputLine + "\n");
 in.close();
 StreamResult result = new StreamResult(response.getOutputStream());
 response.setHeader("Content-Length", String.valueOf(jsonResponse.length()));
 response.getOutputStream().flush();

 byte[] buf = jsonResponse.toString().getBytes();
 response.setContentLength(buf.length);
 ServletOutputStream servletOut = response.getOutputStream();
 servletOut.write(buf);
 }
}

<servlet>
        <servlet-name>searchJSON</servlet-name>
        <servlet-class>org.dspace.app.webui.servlet.SearchJSONServlet</servlet-class>
</servlet>
<servlet-mapping>
        <servlet-name>searchJSON</servlet-name>
        <url-pattern>/searchJSON/*</url-pattern>
</servlet-mapping>