How do I Set the Selected Value in a jQuery Select2 Dropdown?

How to Set Selected Value of jQuery Select2?

Select2 is a powerful jQuery plugin for creating searchable, taggable, and multi-value select boxes. This guide outlines three methods for setting a specific value as selected within a Select2 instance, depending on the version being used (prior to v4 or v4 and above).

Select2 < v4

1. Create an empty input field: Add an element with the type attribute set to "hidden" and an id attribute that corresponds to the Select2 instance.
2. Initialize Select2: Create a Select2 instance using the select2() method, passing in the desired options for the instance.
3. Set the selected value: Use the select2('data', { id: "", text: "" }) method to set the selected value. Specify the id of the item to be selected and any associated text.

Select2 v4 or Above

For HTML Select:

1. Append the selected option: Add an element with the selected attribute set to "selected" and specify the desired value and text.
2. Trigger a change event: Use trigger('change') to update the Select2 instance with the new value.

For Non-HTML Select (JQuery):

1. Create a new option: Use the jQuery $('') syntax to create a new element with the desired value and text.
2. Append and trigger change: Append the new option to the Select2 instance using append() and trigger a change event using trigger('change').

For Setting a Simple Value:

Use val(value).trigger('change') to set a simple value without creating a new option.

Example:

<code class="javascript">$('#mySelect2').select2('data', { id: '5', text: 'Option 5' });</code>

This code sets the option with the ID "5" and text "Option 5" as selected within the instance of Select2 with the ID "mySelect2."

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