CODEWITHSUNDEEP
jqueryasp.net-mvcasp.net-mvc-3
rk1962
rk1962

Reputation: 1793

MVC3 jQuery Autocomplete is not displaying the results

The following jQuery autocomplete code is not displaying the results in MVC3. When I debug the code, I can see it is calling the QuickSearchByLastName correctly. Can someone tell me if my code is incorrect? (I also tried with jquery-1.6.2.min.js with no luck) Thank you!

Index.cshtml:

@using (Ajax.BeginForm(new AjaxOptions
{
    HttpMethod = "GET",
    InsertionMode = InsertionMode.Replace,
    UpdateTargetId = "results"
}
))
{               
    <input type="text" name="q" data-autocomplete="@Url.Action("QuickSearchByLastName","Search")"  />                 
}
<div id="results" >
</div>    


----------------------------------------------------------------
Search Controller:

    public ActionResult QuickSearchByLastName(string term)
            {
                using (var context = new CSCContext())
                {
                    var searchResults = context.Students
                                      .Where(s => s.LastName.Contains(term) && s.IsActive == true)
                                      .Take(10)
                                      .Select(s => new { label = s.LastName });


                    return Json(searchResults, JsonRequestBehavior.AllowGet);
                }                
            }

_Layout.cshtml:
    @Content.Script("jquery-1.4.4.min.js", Url)              
    @Content.Script("jquery.unobtrusive-ajax.min.js", Url)
    @Content.Script("jquery-ui.min.js", Url)     
    @Content.Script("jquery.validate.min.js", Url)    
    @Content.Script("jquery.validate.unobtrusive.min.js", Url)    
    @Content.Script("CSC.js", Url)  
    @RenderSection("scripts", false)

CSC.js 

$(document).ready(function () 
{
    $(":input[data-autocomplete]").each(function () 
    {
        $(this).autocomplete({ 
                               source: $(this).attr("data-autocomplete")
                              }
                            );
    });

});

The following code fixed the issue:

public ActionResult QuickSearchByLastName(string term)
        {           
            var context = new CSCContext();
            try
            {

                var searchResults = context.Students
                                  .Where(s => s.LastName.Contains(term) && s.IsActive == true)
                                  .Take(10)
                                  .Select(s => new { label = s.LastName });


                return Json(searchResults.ToList(), JsonRequestBehavior.AllowGet);
            }
            finally
            {
                context.Dispose();
            }                       
        }

Upvotes: 1

Views: 4706

Answers (4)

Yasser Shaikh
Yasser Shaikh

Reputation: 47774

Short answer : Refer this post jQuery UI autocomplete with ASP.NET Web API

Long answer :

Step 1 : Getting Web Api Ready

Lets first create a web api method that will return a list of item (Artists) using the search term query sent from the autocomplete textbox. In this post I am not using database, instead I'll be using List to keep this example as simple as possible.

Below is how I have defined my Artist class

public class Artist
{
    public int Id { get; set; }
    public int Name { get; set; }
}

Next I have created a Web Api GET method that will use the search term entered in the autocomplete textbox and with a little help of LINQ will return a list of matching results.

using System.Collections.Generic;
using System.Linq;
using System.Web.Http;

namespace Autocomplete.Controllers
{
    public class ArtistApiController : ApiController
    {

        public List<Artist> ArtistList = new List<Artist>
        {
            new Artist{Id = 1, Name = "Sonu Nigam"},
            new Artist{Id = 2, Name = "Sunidhi Chauhan"},
            new Artist{Id = 3, Name = "Shreya Goshal"},
            new Artist{Id = 4, Name = "Mohit Chauhan"},
            new Artist{Id = 5, Name = "Nihkil Dsouza"},
            new Artist{Id = 6, Name = "Kailash Kher"},
            new Artist{Id = 7, Name = "Atif Aslam"},
            new Artist{Id = 8, Name = "Ali Zafar"},
            new Artist{Id = 9, Name = "Shafaqat Ali"},
            new Artist{Id = 10, Name = "Shankar Madahevan"}
        }; 


        // GET api/values
        public IEnumerable<Artist> Get(string query)
        {
            return ArtistList.Where(m => m.Name.Contains(query)).ToList();
        }
    }
}

Our server side code is ready ! Time to test it out.

enter image description here

Step 2 : Client side code

Include jquery-ui.js and jquery.ui.css in your html

<script type="text/javascript" src="~/Scripts/jquery-1.7.1.min.js" ></script>
<script type="text/javascript" src="~/Scripts/jquery-ui-1.8.20.min.js" ></script>
<link href="~/Content/themes/base/jquery.ui.all.css" rel="stylesheet" />

<div id="body">
    <label for="autocomplete-textbox">Search : </label>
    <input type="text" id="autocomplete-textbox" />
</div>

<script type="text/javascript">
$(document).ready(function (){
$('#autocomplete-textbox').autocomplete({
    source: function (request, response) {
        // prepare url : for example '/api/artistapi?query=sonu
        var autocompleteUrl = '/api/artistapi' + '?query=' + request.term;
        $.ajax({
            url: autocompleteUrl,
            type: 'GET',
            cache: false,
            dataType: 'json',
            success: function (json) {
                // call autocomplete callback method with results  
                response($.map(json, function (data, id) {
                    return {
                        label: data.Name,
                        value: data.Id
                    };
                }));
            },
            error: function (xmlHttpRequest, textStatus, errorThrown) {
                console.log('some error occured', textStatus, errorThrown);
            }
        });
    },
    minLength: 2,
    select: function (event, ui) {
        alert('you have selected ' + ui.item.label + ' ID: ' + ui.item.value);
        $('#autocomplete-textbox').val(ui.item.label);
        return false;
    }
});
});
</script>

One thing to note here is that inside the success method I have used the following code :

response($.map(json, function (data, id) {
    return {
        label: data.Name,
        value: data.Id
    };
}));

data.Id and data.Name is used because in the ajax response (as shown below) data is returned in this format.

enter image description here

Step 3 : Test & Output :

enter image description here

Taken from here

Upvotes: 1

amaca
amaca

Reputation: 1480

I was having the same problem as rk1962 (and a quick websearch shows plenty of other people having the same issue). I replicated Darin's code from above and it worked. It is when I take the script from the top of Index.cshtml and place it in a separate scripts file that it stops working - QuickSearchByLastName doesn't get called.

Andrew

Upvotes: 0

Babu
Babu

Reputation: 11

For some reason, the script file 

<script src="@Url.Content("~/Scripts/jquery-1.5.1.min.js")" type="text/javascript"></script>

needs to be included in the top, NOT as specified in the bottom of any file to increase performance.

If you do it will work.

Upvotes: 1

Darin Dimitrov
Darin Dimitrov

Reputation: 1038720

I have tried replicating your scenario to no avail as it always worked for me. Here's what I did.

  1. Create a new ASP.NET MVC 3 project using the Internet Template

  2. HomeController:

    public class HomeController : Controller
{
    public ActionResult Index()
    {
        return View();
    }

    public ActionResult QuickSearchByLastName(string term)
    {
        var results = Enumerable
            .Range(1, 5)
            .Select(x => new { 
                id = x, 
                label = "label " + x, 
                value = "value " + x 
            });
        return Json(results, JsonRequestBehavior.AllowGet);
    }
}

  3. Index.cshtml

    <link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.14/themes/base/jquery-ui.css" type="text/css" media="all" /> 
<script src="@Url.Content("~/Scripts/jquery-1.5.1.min.js")" type="text/javascript"></script>
<script src="@Url.Content("~/Scripts/jquery-ui-1.8.11.min.js")" type="text/javascript"></script>

<script type="text/javascript">
    $(function () {
        $(':input[data-autocomplete]').each(function () {
            $(this).autocomplete({
                source: $(this).attr('data-autocomplete')
            });
        });
    });
</script>

@using (Html.BeginForm())
{               
    <input type="text" name="q" data-autocomplete="@Url.Action("QuickSearchByLastName", "Home")" />
}

I used jquery-1.5.1.min.js and jquery-ui-1.8.11.min.js which are bundled by default with ASP.NET MVC 3 RTM. I also tried putting this in a Ajax.BeginForm and also importing the default unobtrusive scripts and it was still working for me.

Upvotes: 5

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