Constraining Tag Creation

Use customTagCheck option via JavaScript or data-custom-tag-check via attribute to add some logic to the select field to return a Boolean if an invalid value is entered. You can use the name of a function to set the option or a callback function.

Possible options to search for are: Banana, Apple, Orange, Lemon, Pepper, Mushrooms, Cabbages, Celery, Brocoli, Garlic

<div class="container">
    <select id="my-select" multiple="multiple">
        <option value="Apple" selected="selected">Apple</option>
    </select>
</div>

function checkTag(input) {
    return new Promise(function (resolve, reject) {
        let ret = true;
        if (input === "" || input.toLowerCase().includes("ä") || input.toLowerCase().includes("ö") || input.toLowerCase().includes("ü")) {
          ret = false;
        }
        setTimeout(() => resolve(ret), 5000);
    });
}

let select = new betterNiceSelect.BetterNiceSelect("#my-select", {customTagCheck: 'checkTag', tags: true});