I am using select2 (http://ivaynberg.github.io/select2/) for my tagging input. from the example in using select2 tagging the code is look like this.
$(\"#e1
For Select2 4.0 I had to add the data attribute to select2 and also set value and trigger change, like this:
$('#mySelect').select2({
data: ['one','two'],
tags: true
});
$('#mySelect').val(['one','two']).trigger('change')
Updated version
Say you initialized your select like this:
$('.mySelect').select2({
multiple: true,
tags: "true"
});
Then use this 2 functions for triggering the change. (as seen in the official documentation)
$('.mySelect').val(['value1', 'value2']);
$('.mySelect').trigger('change.select2');
Where "value1" and "value2" are IDs of the option
elements of the select.
You can initialize the Select2 control by providing a value for the hidden input:
<input type="hidden" id="e12" value="brown,red,green" />
And you can set the value of the Select2 control by passing an array to the 'val' method:
$('#tagSelect').select2('val', ['brown','red','green']);
jsfiddle demo