Question

I have really big problem with calling JSON with jQueryUI autocomplete.
I have this fairly simple JS:

$(document).ready(function() {
    $('#Editor_Tags').autocomplete({
        source: "/Forums/Ajax/GetTags",
        focus: function () {
            // prevent value inserted on focus
            return false;
        },
        select: function (event, ui) {
            var terms = split(this.value);
            // remove the current input
            terms.pop();
            // add the selected item
            terms.push(ui.TagName);
            // add placeholder to get the comma-and-space at the end
            terms.push("");
            this.value = terms.join(", ");
            return false;
        }
    });
});

And this is model I’m trying to return:

public class TagView
{
    public int TagId { get; set; }
    public string TagName { get; set; }
    public int Weight { get; set; }
}

But that’s not the main issue.
Main issue is, When I start typing, jQuery do not make request to controller. I’m 100% sure, that the Url speciefied is good. Because I can manually access to controller by typing /Forums/Ajax/GetTags?term=text
And I get results for it.
I’m using newset version of jQuery and jQUI directly rom google CDN.

Answer 1

The jQueryUI autocomplete widget expects data in the source parameter to meet the following requirements:

[..] a simple Array of Strings, or it
contains Objects for each item in the
array, with either a label or value
property or both.

So you have two options:

1. Change the viewmodel you’re serializing to JSON to meet those requirements:

   public class TagView
   {
       public string Label { get; set; }
       public string Value { get; set; }
   }
   

2. Change the autocomplete widget’s source parameter to be a function in which you perform the AJAX call yourself and format the data appropriately:

   $("#Editor_Tags").autocomplete({
       source: function (request, response) {
           $.getJSON("/Forums/Ajax/GetTags", { term: request.term }, function (data) {
               response($.map(data, function (el) {
                   return {
                       label: el.TagName,
                       value: el.TagId
                   };
               }));
           });
       },
       /* other autocomplete options */
   });
   

   This is assuming that the data returned from the server is a JSON array of TagView objects.

The second piece of code is untested, but it should at least get you in the right direction.