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JavaScript options : Initialize your collection with a given minimum number of elements

Use init_with_n_elements option to ensure that your collection will be initialized with the given number of arguments.

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This demostration is made of the following files (click to see on GitHub in a new tab):
    -     Controller/OptionsController.php
    -     Resources/views/Options/givenMinimumElements.html.twig

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Add, move, remove values and press Submit.

Submit

Code used:

    <script type="text/javascript">

        //
        // Form is initialized without any element, but 5 empty elements
        // are created at startup.
        //
        $('.form-collection').collection({
            init_with_n_elements: 5
        });

    </script>