jquery select2 - not working

问题

I am using select2 plugin(ivaynberg.github.io/select2). I am trying to display a dropdown(select). It is getting all the items in data.php as options. However select2 is meant to be autocomplete plugin and should search for the search term a client input, and display the matching results only. At the moment it is displaying all the items and not getting the search results. Sorry for my language

data.php is echoing out this:

[{
    "id": "1",
    "text": "item1",
    "exercise": "blah text"
  }, {
    "id": "2",
    "text": "item2"
  }
]

The code is:

$(document).ready(function () {
    $('#thisid').select2({
        minimumInputLength: 2,
        ajax: {
            url: "data.php",
            dataType: 'json',
            data: function (term, page) {
                return {
                    q: term
                  };
            },
            results: function (data, page) {
                return {
                    results: data
                };
            }
        }
    });
});

and the input is:

<input type="hidden" id="thisid" style="width:300px" class="input-xlarge" />

I want to find a clue, I am quite new to this plugin and have spent a day for looking at examples.

回答1:

select2 will not do AJAX if attached to a standard select form control. It MUST be attached to a hidden input control to load via AJAX.

Update: This has been fixed in Select2 4.0. From Pre-Release notes:

Consistency with standard <select> elements for all data adapters, removing the need for hidden <input> elements.

It can also be seen in function in their examples section.

回答2:

I guess user2315153 wants to receive multiple remote values, and incorrectly assigning select2() with ajax call to a <select> element.

The correct way to get remote values, is using a normal <input> element, and if is desired multiple values, inform the "multiple" parameter on method call. Example:

<input type="hidden" id="thisid" style="width:300px" class="input-xlarge" />
<script>
$('#thisid').select2({
        minimumInputLength: 2,
        multiple: true,
        ajax: {
              ...

The <select> element CAN NOT be used to remote values

UPDATE: As of select2 4.0.0, hidden inputs has deprecated:

https://select2.github.io/announcements-4.0.html#hidden-input

This means: Instead of using an input to attrib select2 plugin, use an SELECT tag.

Pay attention: it's easy to use any format of json from your server. Just use "processResults" to do it.

Example:

<select id='thisid' class='select2-input select2'></select>
<script>
        $("#thisid").select2({
            multiple: true,
            closeOnSelect: true,

            ajax: { 
                url: "myurl",
                dataType: 'json',
                delay: 250,
                data: function (params) {
                    return {
                      q: params.term,
                      page: params.page
                    };
                  },
                processResults: function (data, page) { //json parse
                    console.log("processing results");
                    //Transform your json here, maybe using $.map jquery method
                    return { 
                       results: yourTransformedJson
                    };
                },
                cache: (maybe)true
            }
        });
</script>

回答3:

I try the code, it works well. I think you not include jquery framework or check the path of js and css.

<!DOCTYPE html>
<html>
<head>
    <link href="select2.css" rel="stylesheet"/>
    <script src="//code.jquery.com/jquery-latest.min.js"></script>
    <script src="select2.min.js"></script>
    <script>
        $(document).ready(function() { 
            $('#thisid').select2({
                minimumInputLength: 2,
        ajax: {
            url: "data.php",
            dataType: 'json',
            data: function (term, page) {
                return {
                    q: term
                  };
            },
            results: function (data, page) {
                return {
                    results: data
                };
            }
        }
    });

        });
    </script>
</head>
<body>
    <input type="hidden" id="thisid" style="width:300px" class="input-xlarge" />

</body>
</html>

回答4:

I think no need to go with hidden input element. You can give a try, get plain html data from ajax call and set it in and then init select2 resetting method. Here's code snippet

HTML

<select id="select" name="select" class="select2">
        <option value="" selected disabled>Please Select Above Field</option>
</select>

Javascript

    $.ajax({
        type: "POST",
        cache:false,
        url: YOUR_AJAX_URL,
        success: function(response)
        {
            $('#select').html(response);
        }
    });
    $('#select').select2("val","");

Ajax Response :

<option value="value">Option Name</option>
.
.
.
<option value="value">Option Name</option>

回答5:

After much reading, I decided to change the select2.js itself.

At line 2109 change it to

this.focusser.attr("id", "s2id_"+this.select.context.id);

If your input tag is as so

<select id="fichier">

Hence your input tag that is searching through the list will have an id of s2id_fichier_search

As far as I know, there shouldn't be a conflict and THIS will allow you to have multiple select2 on the same page and run your functions (including .get, .post) through their events eg.

$(function() { 
  $('#s2id_fichier_search').keyup(function() {
    console.log('Be Practical')
  })
}

So this will run like if you were to use

<select id="fichier" onkeyup="console.log('Be Practical')">

回答6:

In my case, an older version of select2 library was causing the issue, make sure that you include the latest version of js and css in the web page.

来源：https://stackoverflow.com/questions/16190088/jquery-select2-not-working

标签

jquery

ajax

jquery-select2