Disable dropdown opening on select2 clear

问题

Seems that select2 4 opens by default the dropdown when clearing the current selected item. Previous versions of select2 didn't seem to have that behaviour and I'm trying to achieve it but no luck for now.

Does anyone know how to hook into the clear event so we can disable it's default behaviour and clear the selected option without opening the dropdown?

Cheers, Al

回答1:

Can confirm, preventing events seems to not work for some reason, so you can just close the dropdown after some timeout:

$("select").select2({
    allowClear: true
}).on("select2:unselecting", function(e) {
    $(this).data('state', 'unselected');
}).on("select2:open", function(e) {
    if ($(this).data('state') === 'unselected') {
        $(this).removeData('state'); 

        var self = $(this);
        setTimeout(function() {
            self.select2('close');
        }, 1);
    }    
});

Here's a working fiddle: http://jsfiddle.net/obq3yLf2/

回答2:

You don't require a timeout to make this work, here's my example:

$('#my-select').select2({
    allowClear: true
}).on('select2:unselecting', function() {
    $(this).data('unselecting', true);
}).on('select2:opening', function(e) {
    if ($(this).data('unselecting')) {
        $(this).removeData('unselecting');
        e.preventDefault();
    }
});

回答3:

Please refer at Github for same.

Prevent select2:open when clearing selection

From there I have listed the provided answers.

1 Option

$('#select-id').on('select2:unselecting', function() {
    var opts = $(this).data('select2').options;
    opts.set('disabled', true);
    setTimeout(function() {
      opts.set('disabled', false);
    }, 1);
});

2 Option

var $el = $('#select-id');
$el.on('select2:unselecting', function(e) {
    $el.data('unselecting', true);
}).on('select2:open', function(e) { // note the open event is important
    if ($el.data('unselecting')) {    
        $el.removeData('unselecting'); // you need to unset this before close
        $el.select2('close');
    }
});

回答4:

I had a problem with a short delay after deselecting one of the items and this solution fixed that issue for me:

$(this).select2({
    multiple: 'multiple',
}).on("select2:unselecting", function(e) {
    var self = $(this);
    setTimeout(function() {
        self.select2('close');
    }, 0);
});

回答5:

Another simple Implementation:

$('select').on('select2:unselect', function(evt) {
    $(this).select2({
        placeholder : {
            id : '',
            text : '---None Selected---'
        },
        allowClear : true,
        theme : "bootstrap"
    }).select2('close');
});

来源：https://stackoverflow.com/questions/29618382/disable-dropdown-opening-on-select2-clear