Preselecting value in select2

Question

Texbox is dynamically filled with a remote call using Select2 and how do I set preselected value. Here is the code

<input type="hidden" id="e6">

$("#e6").select2({
    placeholder: "Search for a movie",
    minimumInputLength: 1,
    ajax: {
        url: url,
        dataType: 'jsonp',
        data: function (term, page) {
            return {
                q: term, // search term 
                page_limit: 10, }; 
        }, 
        results: function (data, page) { 
                return {results: data};
        }
    }
});    

I tried this to preselect value 1049

$('#e6').select2('val', '1049');

but this doesn't set the value on the textbox.

Any ideas?

Answer 1

In case anybody wants to know how to solve this

$("#e6").select2('data', {id: '1049', text: 'MyLabel'});

Answer 2

The solution that worked for me (and that is decribed in the documentation) was:

$('#mySelect2').val('1'); // Select the option with a value of '1'
$('#mySelect2').trigger('change'); // Notify any JS components that the value changed

Answer 3

I got it to work with

$("#e6").val("input id of the select2 option here").trigger("change")

Answer 4

in 2019 this worked for me

    // Create a DOM Option and pre-select by default~
    var newOption = new Option(data.text, data.id, true, true);
    // Append it to the select
    $('#mySelect2').append(newOption).trigger('change');

Answer 5

You can use initSelection method

initSelection: function(element, callback) {
callback({id: 1, text: 'default selection with id 1' });
},

Check this link and loading remote data section here

Answer 6

for multiple selection...

var li = $("#e6");
li.select2({
    placeholder: "Placeholder"
});

var unselected = li.find('option:not(:selected)');
var selected = [];
for (var i = 0; i < unselected.length; i++) {
    selected[i] = { id: unselected[i].value, text: unselected[i].text };
}
li.select2('data', selected);

Answer 7

This worked for me

<script>
  $(function() {
    if (window.formPrefill) {
      // setTimeout to force script to run when all the stack on doc.ready is complete.
      setTimeout(() => $(".js-select2-companies").select2('data', window.formPrefill), 10);
    }
  })
</script>

Answer 8

According to documentation, you can do it like this for multiple preselection:

$('#mySelect2').val(['1', '2']); 
$('#mySelect2').trigger('change'); // Notify any JS components that the value changed

https://select2.org/programmatic-control/add-select-clear-items

Answer 9

in my case, my selected values were saved with comma seperated in my database so i used this approach and it worked for me

        var ele = document.getElementById('farmProduce');
        let val =ele.getAttribute('value')
        for(i=0; i < len; i++){ 
            ele.innerHTML = ele.innerHTML + '<option value="' + farm_produce[i].name + '"' + (val.includes(farm_produce[i].name) ? 'selected="'+true+'"' : null)+'>' + farm_produce[i].name + '</option>';
        }

so essentially, just setting the selected attribute to true and false for each option did the tricks for me

Answer 10

I know this is an old question, but I had troubles with it too.

Since the select2 is filled when user inputs some text via AJAX, it starts empty. So the answers of the type .val('') don't apply

$('#e6').val('1'); // Select the option with a value of '1'
$('#e6').trigger('change'); // Notify any JS components that the value changed

Then you need to preload some data to the select2. The selected answer did not work for me

$("#e6").select2('data', {id: '1049', text: 'MyLabel'});

You can force it to be preloaded by the AJAX using the code in the documentation.

In my case I needed this select2 prefilled with preselected elements while maintaining the AJAX search, I used the following:

select2 = $('#e6'); 
var option = new Option('MyLabel', 1049, true, true); //The true vars are for preselecting
select2.append(option); //You can repeat this and the previous line for multiselect
select2.trigger('change'); //Call change event so the control updates

In fewer lines:

var option = new Option('MyLabel', 1049, true, true); //The true vars are for preselecting. 1049 is the id.
$('#e6').append(option).trigger('change'); //Append option and call change event 

Hope this helps someone.