带Backbone.Marionette的Select2：未隐藏预选值

Question

I am trying to integrate Select2 within a Marionette ItemView.

The problem: I want to initialize the Select2 with already-selected values, but the selected elements are still available in the dropdown. If I clear the box then manually reselect the items from the dropdown, the items are then properly removed from the dropdown.

Javascript:

View.Profile = Marionette.ItemView.extend({
    template: profileTpl,
    onShow: function(){
      var $select = this.$("#categories"); // grabs the element for Select2
      $select.select2();                   // build the Select2 element
      $select.select2("val", ["american", "french", "italian"]); // select values
    }

HTML:

<select id="categories" data-placeholder="Add a category..." multiple class="form-control" tabindex="8">
  <option></option>
  <option value="american">American</option>
  <option value="french">French</option>
  <option value="italian">Italian</option>
  <option value="indian">Indian</option>
</select>

I can do this on a single html example page with no trouble.

Using Marionette's onShow, the "tag" elements correctly displayed in the Select2 box, but when I click the box to select different options, all options are still available.

I suspect there is some event not properly attached to the Select2 element because of the way I'm attaching the Select2 element in the onShow event.

Answer 1

Here is working example of your issue.

Just one note related to your code. It's a good practice, when accessing an element of view, use this.$el.find('selector') reference instead of querying it via jquery $('selector') .

You can do it even shorter like this.$('selector') .