How to Programmatically Set the Selected Value in jQuery Select2?

How to set selected value of jQuery Select2?

jQuery Select2 is a popular plugin that enhances the usability of select elements. One of its useful features is the ability to programmatically set the selected value. This can be particularly helpful in scenarios where a predefined value needs to be displayed upon initial page load or when editing previously saved selections.

Select2

Step 1: HTML Markup

Include a hidden input field to hold the selected value:

<code class="html"><input type="hidden" name="mySelect2" id="mySelect2"></code>

Step 2: Create a Select2 Instance

Initialize Select2 with the appropriate options:

<code class="js">$("#mySelect2").select2({
  placeholder: "My Select 2",
  multiple: false,
  minimumInputLength: 1,
  ajax: {
    url: "/elements/all",
    dataType: 'json',
    quietMillis: 250,
    data: function(term, page) {
      return {
        q: term,
      };
    },
    results: function(data, page) {
      return { results: data };
    },
    cache: true
  },
  formatResult: function(element){
    return element.text + ' (' + element.id + ')';
  },
  formatSelection: function(element){
    return element.text + ' (' + element.id + ')';
  },
  escapeMarkup: function(m) {
    return m;
  }
});</code>

Step 3: Set the Desired Value

Use the data() method to set the selected value:

<code class="js">$("#mySelect2").select2('data', { id: "elementID", text: "Hello!"  });</code>

Select2 V4

Using HTML

For Select2 v4, you can directly append a selected option to the select element:

<code class="html"><select id="myMultipleSelect2" multiple name="myMultipleSelect2[]">
    <option value="TheID" selected>The text</option>
</select></code>

Using jQuery

<code class="js">var $newOption = $("<option selected></option>").val("TheID").text("The text");
$("#myMultipleSelect2").append($newOption).trigger('change');</code>

Directly Setting Value

<code class="js">$("#myMultipleSelect2").val(5).trigger('change');</code>

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