Trying to modify the chosen option while filtering an ajax source using select2?

I am currently integrating the select2 library within a Bootstrap 4 modal in the following manner:

<div class="form-group" id="fg-jbInd">
 <label for="jbIndustry" class="control-label"gt;Industry *
  <select type="text" id="jbIndustry" class="form-control" name="jbIndustry">
  </select>
 </label>
</div>

The JavaScript implementation is as follows:

$('#jbIndustry').select2({
    placeholder: 'Please select one or more industries or leave blank',

    minimumInputLength : 2,
    dropdownParent: $('#fg-jbInd'),
    ajax: {
    url : '/getindustry',
    dataType : 'json'
    }
});

The response from the ajax call returns data structured like this:

{results : [{id : 1, test: 'option 1'},
            {id : 2, text: 'option 2'}
            ]

The functionality of selecting an option and populating the field is functioning properly. However, I encounter an issue when attempting to select another option. Although the desired option is visible while typing, upon selection, the field does not populate with the new choice, retaining the original selection instead. This behavior can be bypassed by removing the search limit on the database, allowing the selection of a different option to populate the field. Upon further investigation, I found that for it to work correctly, the data must include the original selection, demonstrated as such:

{results : [{id : 1, test: 'option 1'},
            {id : 2, text: 'option 2', selected : true}
            ]

In scenarios where the selected option is omitted from the data, the feature fails to perform adequately. I am curious if others have encountered similar challenges. Thank you!

Answer №1

The challenge I faced involved the method of creating an index for each option. In my approach, I utilized the array index from the data retrieved from mongodb in each ajax call. This resulted in generating a new index at times, leading to different index values for the same item.

r.forEach(function(ind, i){
    result.push({'id' : i, 'text' : ind.indName});
});

To address this issue, I modified my solution by using the unique object id generated by mongodb instead. This id remains consistent and does not change even if the same item is returned.

r.forEach(function(ind, i){
    result.push({'id' : ind._id, 'text' : ind.indName});
});

I hope sharing this experience will benefit others!

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