javascript - JQuery 选择菜单返回错误 Uncaught TypeError : undefined is not a function

Question

HTML:

<form action="#">
    <fieldset>
        <label>Escolha:</label>
        <select id="horizonte">
            <option value=1>1 Mês</option>
            <option value=2>2 Meses</option>
            <option value=3 selected="selected">3 Meses</option>
            <option value=6>6 Meses</option>
        </select>
    </fieldset>
</form>

JS:

$(document).ready(function () {    
    $("#horizonte").selectmenu();
});

为什么选择菜单没有正确初始化？

参见 JSFiddle

Answer 1

Selectmenu 小部件直到版本 1.11 才被添加为 API Documentation lists

version added: 1.11

至少包含 1.11 版本的 jQuery UI

$(document).ready(function () {
    $("#horizonte").selectmenu();
});

<link rel="stylesheet" href="//code.jquery.com/ui/1.11.2/themes/smoothness/jquery-ui.css">
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script src="//code.jquery.com/ui/1.11.2/jquery-ui.js"></script>
<form action="#">
  <fieldset>
    <label>Escolha:</label>
    <select id="horizonte">
      <option value=1>1 Mês</option>
      <option value=2>2 Meses</option>
      <option value=3 selected="selected">3 Meses</option>
      <option value=6>6 Meses</option>
    </select>
  </fieldset>
</form>