How to make use of it:

1. Load the script jquery.repeater.min.js after the jQuery library.

<script src="/path/to/cdn/jquery.slim.min.js"></script>
<script src="/path/to/jquery.repeater.min.js"></script>

2. Add the data-repeater-item attribute to the repeatable form fields.

<form class="example">
  <div data-repeater-list="jquery-script-code">
    <div data-repeater-item>
      <input type="text" name="text-input" value="jQuery" />
    </div>
    <div data-repeater-item>
      <input type="text" name="text-input" value="Script-code" />
    </div>
  </div>
</form>

3. Add the Delete and Duplicate buttons to the form.

<form class="example">
  <div data-repeater-list="jquery-script-code">
    <div data-repeater-item>
      <input type="text" name="text-input" value="jQuery" />
      <input data-repeater-delete type="button" value="Delete" />
    </div>
    <div data-repeater-item>
      <input type="text" name="text-input" value="Script-code" />
      <input data-repeater-delete type="button" value="Delete" />
    </div>
  </div>
  <input data-repeater-create type="button" value="Add"/>
</form>

4. Initialize the plugin.

$('.example').repeater({
  // options here
})

5. Nested form fields are supported.

<form class="example">
  <div data-repeater-list="jquery-script">
    <div data-repeater-item>
      <input type="text" name="text-input" value="jQuery" />
      <input data-repeater-delete type="button" value="Delete" />
      <div class="inner-repeater">
        <div data-repeater-list="another-repeater">
          <div data-repeater-item>
            <input type="text" name="inner-text-input" value="Script-code" />
            <input data-repeater-delete type="button" value="Delete" />
          </div>
        </div>
        <input data-repeater-create type="button" value="Add"/>
      </div>
    </div>
  </div>
  <input data-repeater-create type="button" value="Add"/>
</form>

6. More configs & callbacks.

$('.example').repeater({

  // start with an empty list of repeaters. Set your first (and only)
  // "data-repeater-item" with style="display:none;" and pass the
  // following configuration flag
  initEmpty: true,

  // "defaultValues" sets the values of added items.  The keys of
  // defaultValues refer to the value of the input's name attribute.
  // If a default value is not specified for an input, then it will
  // have its value cleared.
  defaultValues: {
    'text-input': 'foo'
  },

  // Removes the delete button from the first list item
  isFirstItemUndeletable: false,

  // "show" is called just after an item is added.  The item is hidden
  // at this point.  If a show callback is not given the item will
  // have $(this).show() called on it.
  show: function () {
    $(this).slideDown();
  },

  // "hide" is called when a user clicks on a data-repeater-delete
  // element.  The item is still visible.  "hide" is passed a function
  // as its first argument which will properly remove the item.
  // "hide" allows for a confirmation step, to send a delete request
  // to the server, etc.  If a hide callback is not given the item
  // will be deleted.
  hide: function (deleteElement) {
    if(confirm('Are you sure you want to delete this element?')) {
      $(this).slideUp(deleteElement);
    }
  },

  // You can use this if you need to manually re-index the list
  // for example if you are using a drag and drop library to reorder
  // list items.
  ready: function (setIndexes) {
    $dragAndDrop.on('drop', setIndexes);
  },

})

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