<apex:component controller="autoCompleteController">


   <apex:includeScript value="{!URLFOR($Resource.jqueryui18, 'js/jquery-1.7.1.min.js')}" /> 

   <apex:includeScript value="{!URLFOR($Resource.jqueryui18, 'js/jquery-ui-1.8.18.custom.min.js')}" /> 

   <apex:stylesheet value="{!URLFOR($Resource.jqueryui18, 'FlickTheme.css')}"/> 

  

  <!-- Attributes Required For Component -->

  <apex:attribute name="objectname" description="The object name you want to look for." type="String" required="true"/>

  <apex:attribute name="additionalfield" description="Any additional fields you'd like to search and include in the display." type="String" required="false"/>

  <apex:attribute name="profilename" description="To filter on the basis of profile name and include in the display." type="String" required="false"/>

  <apex:attribute name="autocomplete_textbox" description="The ID for the Autocomplete List Textbox." type="String" required="true"/>

   <!-- CSS  -->

  <style>

    .ui-autocomplete-loading {background: white url({!$Resource.loadingIcon}) right center no-repeat;}

  </style>

  <!-- Javascript -->

  <script type="text/javascript">

    var j$ = jQuery.noConflict();

    j$(document).ready(function() 

    {

        var sObjects;

        var queryTerm;

        j$(esc('{!autocomplete_textbox}')).autocomplete({

            minLength: 1,

            source: function(request, response) {

                        queryTerm = request.term;

                        autoCompleteController.findSObjects("{!objectname}", request.term, "{!additionalfield}", "{!profilename}", function(result, event){

                            if(event.type == 'exception') 

                            {

                                  alert(event.message);

                            } else 

                            {

                                 sObjects = result;

                                 response(sObjects);

                            }

                        });

                   },

            focus: function( event, ui ) {

                    
                    j$(esc('{!autocomplete_textbox}')).val(ui.item.Name);
                    
                    
                    return false;

                    },

            select: function( event, ui ) {

                        j$(esc('{!autocomplete_textbox}')).val( ui.item.Name );

                        j$(esc('{!autocomplete_textbox}_lkid')).val( ui.item.Id );

                       j$(esc('{!autocomplete_textbox}_lkold')).val( ui.item.Name );

                        if (event.keyCode == 13) { 

                           event.preventDefault();

                        }

                        return false;

                    },
                    

                    
                    

         })

         .data( "autocomplete" )._renderItem = function( ul, item ) {

            var entry = item.Name;

            if("{!additionalfield}" !='')

            {

                j$.each("{!additionalfield}".split(",") , function(key, value) {

                    entry = entry + " " + item[value];

                });

            }

            //entry = entry + "</a>";

            //entry = entry.replace(queryTerm, "<b>" + queryTerm + "</b>");

            entry = entry.replace( new RegExp( "(" + queryTerm + ")" , "g" ), "<strong>$1</strong>" );

            return j$( "<li></li>" )

                .data( "item.autocomplete", item )

                .append( "<a>" + entry + "</a>")

                .appendTo( ul );

        };

    });

    function esc(myid) 
    {
         return '#' + myid.replace(/(:|\.\&)/g, '\\\\$1');

           //return '#' + myid.replace(/&amp;/g, '&')
    }


  </script>

</apex:component>

global class autoCompleteController 
{
    @RemoteAction
    global static SObject[] findSObjects(string obj, string qry, string addFields, string profilename) 
    {
        /* More than one field can be passed in the addFields parameter
           Split it into an array for later use */
        List<String> fieldList=new List<String>();
        if (addFields != '')  
        fieldList = addFields.split(',');
        
        /* Check whether the object passed is valid */
        Map<String, Schema.SObjectType> gd = Schema.getGlobalDescribe();
        Schema.SObjectType sot = gd.get(obj);
        if (sot == null) 
        {
            return null;
        }
        
        /* Creating the filter text */
        String filter = ' like \'%' + String.escapeSingleQuotes(qry) + '%\'';
        
        /* Begin building the dynamic soql query */
        String soql = 'SELECT Name';
        
        /* If any additional field was passed, adding it to the soql */
        if (fieldList.size()>0) 
        {
            for (String s : fieldList) 
            {
                soql += ', ' + s;
            }
        }
        
        /* Adding the object and filter by name to the soql */
        soql += ' from ' + obj + ' where name' + filter;
        
        if(profilename!='')
        {
            //profile name and the System Administrator are allowed
            soql += ' and Profile.Name like \'%' + String.escapeSingleQuotes(profilename) + '%\'';
            system.debug('Profile:'+profilename+' and SOQL:'+soql);
        }
        
        /* Adding the filter for additional fields to the soql */
        if (fieldList != null) 
        {
            for (String s : fieldList) 
            {
                soql += ' or ' + s + filter;
            }
        }
        
        soql += ' order by Name limit 20';
        
        system.debug('Qry: '+soql);
        
        List<sObject> L = new List<sObject>();
        try 
        {
            L = Database.query(soql);
        }
        catch (QueryException e) 
        {
            system.debug('Query Exception:'+e.getMessage());
            return null;
        }
        return L;
   }
}

<apex:inputText label="Name :" value="{!name}" id="Text" required="true" html-autocomplete="on" html-PlaceHolder="Name.." html-inputtype="text" > 
 <c:AutoCompleteComponent autocomplete_textbox="{!$Component.Text}" objectname="Account" /> 
</apex:inputtext>