callback on initSelection

Brad Lilly

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Jul 9, 2012, 10:09:04 AM7/9/12

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Hi There,

A bit stuck on using a callback on initSelection where I need to retrieve a single value back from an ajax call.

I added this patch here.

https://github.com/alanho/select2/commit/af1c39807611538db65886a227e9bf7227f4adba

All seems OK and I get a valid JSON response (below) however the <span> tag is empty.

{"results":[{"id":"4255","text":"Party Tour"}]}


I was working off the sample in the above url for a result.

My code sample is below. Any help would be appreciated.

$('#activitycats').select2({
        placeholder: 'Search for an activity',
        ajax: {
            url: "/ajax/categoriesactivities.php",
            dataType: 'json',
            quietMillis: 100,
            data: function (term, page) {
                return {
                    term: term, //search term
                    page_limit: 10 // page size
                };
            },
            results: function (data, page) {
                return { results: data.results };
            }

        },
        initSelection: function(element, callback) {
            return $.getJSON("/ajax/categoriesactivities.php?id=" + (element.val()), null, function(data) {
                if ($.isFunction(callback)) {
                    return data;
                }
            });
        }

    });

Igor Vaynberg

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Jul 9, 2012, 10:12:27 AM7/9/12

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you need to return just the array portion, no need for the "results" key.

-igor

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Brad Lilly

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Jul 9, 2012, 10:41:17 AM7/9/12

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Thanks Igor I tried that as below. Still no luck.

[{"id":"4255","text":"Party Tour"}]

Igor Vaynberg

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Jul 9, 2012, 10:51:24 AM7/9/12

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this part is also wrong:

if ($.isFunction(callback)) {
return data;
}

should instead be

callback(data);

-igor

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Brad Lilly

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Jul 9, 2012, 11:17:22 AM7/9/12

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Thanks Igor tried that as well and not working for me. Quite tired now and off for some sleep. But if you have any more ideas I would welcome them. A fresh start in the morning might give me results.

On Tuesday, 10 July 2012 00:09:04 UTC+10, Brad Lilly wrote:

Brad Lilly

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Jul 9, 2012, 6:41:39 PM7/9/12

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Thanks Igor a bit of sleep did the trick. I still had an array of values and after running firebug worked out the problem.
Needed it as below without []


{"id":"4252","text":"Abseiling"}

I did see some people asking for PHP examples of server side did you want some of these?

On Tuesday, 10 July 2012 00:09:04 UTC+10, Brad Lilly wrote:

Igor Vaynberg

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Jul 10, 2012, 12:50:44 AM7/10/12

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On Tue, Jul 10, 2012 at 1:41 AM, Brad Lilly <chickp...@gmail.com> wrote:
> Thanks Igor a bit of sleep did the trick. I still had an array of values and
> after running firebug worked out the problem.
> Needed it as below without []
> {"id":"4252","text":"Abseiling"}
>
> I did see some people asking for PHP examples of server side did you want
> some of these?

would be cool to have some on the wiki, yes.

thanks,
-igor

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Brad Lilly

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Jul 11, 2012, 6:48:52 AM7/11/12

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Thanks Igor. This works for me... Hope it can help others.

On Tuesday, 10 July 2012 00:09:04 UTC+10, Brad Lilly wrote:

select2_sample.php

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The issue you’re facing with Select2’s initSelection is similar to ensuring data renders correctly when pulled from dynamic sources. Platforms like thefameplanet show how properly structured and mapped JSON can display cleanly once processed. Likewise, your callback must correctly translate the returned {id, text} pair so the <span> element reflects the selected value without remaining empty.

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