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javascript實現下拉提示選擇框
編輯：關於JavaScript     

本文介紹了select和sugget結合起來使用的例子，支持下拉的直接選擇，也支持在下拉內容中輸入過濾。
整體效果就是下面這樣的：

 

1、首先需要引入如下文件 

<link href="select2.min.css" rel="stylesheet" /> 
<script type="text/javascript" src="jquery-2.1.4.min.js"></script> 
<script type="text/javascript" src="select2.min.js"></script>

這裡要注意jquery要放在select2的前面。
2、一些實例

<!DOCTYPE html> 
<html lang="en"> 
 
<head> 
  <meta charset="UTF-8"> 
  <title>Document</title> 
  <link href="select2.min.css" rel="stylesheet" /> 
  <style type="text/css"> 
  .select2-dropdown { 
    margin-left: 8px !important; 
    margin-top: 20px !important; 
  } 
  </style> 
</head> 
 
<body> 
  <h1>這是單選例子</h1> 
  <div class="s1-example"> 
    <select class="js-example-basic-single" style="width:200px"> 
      <optgroup label="Alaskan/Hawaiian Time Zone"> 
        <option value="AK">Alaska</option> 
        <option value="HI">Hawaii</option> 
        <option value="">請選擇</option> 
      </optgroup> 
      <optgroup label="Pacific Time Zone"> 
        <option value="CA">California1111111111111111111111111111111111111111111111111</option> 
        <option value="NV">Nevada</option> 
        <option value="OR">Oregon</option> 
        <option value="WA">Washington</option> 
      </optgroup> 
      <optgroup label="Mountain Time Zone"> 
        <option value="AZ">Arizona</option> 
        <option value="CO">Colorado</option> 
        <option value="ID">Idaho</option> 
        <option value="MT">Montana</option> 
        <option value="NE">Nebraska</option> 
        <option value="NM">New Mexico</option> 
        <option value="ND">North Dakota</option> 
        <option value="UT">Utah</option> 
        <option value="WY">Wyoming</option> 
      </optgroup> 
      <optgroup label="Central Time Zone"> 
        <option value="AL">Alabama</option> 
        <option value="AR">Arkansas</option> 
        <option value="IL">Illinois</option> 
        <option value="IA">Iowa</option> 
        <option value="KS">Kansas</option> 
        <option value="KY">Kentucky</option> 
        <option value="LA">Louisiana</option> 
        <option value="MN">Minnesota</option> 
        <option value="MS">Mississippi</option> 
        <option value="MO">Missouri</option> 
        <option value="OK">Oklahoma</option> 
        <option value="SD">South Dakota</option> 
        <option value="TX">Texas</option> 
        <option value="TN">Tennessee</option> 
        <option value="WI">Wisconsin</option> 
      </optgroup> 
      <optgroup label="Eastern Time Zone"> 
        <option value="CT">Connecticut</option> 
        <option value="DE">Delaware</option> 
        <option value="FL">Florida</option> 
        <option value="GA">Georgia</option> 
        <option value="IN">Indiana</option> 
        <option value="ME">Maine</option> 
        <option value="MD">Maryland</option> 
        <option value="MA">Massachusetts</option> 
        <option value="MI">Michigan</option> 
        <option value="NH">New Hampshire</option> 
        <option value="NJ">New Jersey</option> 
        <option value="NY">New York</option> 
        <option value="NC">North Carolina</option> 
        <option value="OH">Ohio</option> 
        <option value="PA">Pennsylvania</option> 
        <option value="RI">Rhode Island</option> 
        <option value="SC">South Carolina</option> 
        <option value="VT">Vermont</option> 
        <option value="VA">Virginia</option> 
        <option value="WV">West Virginia</option> 
      </optgroup> 
    </select> 
  </div> 
  <h1>這是多選例子</h1> 
  <div class="s2-example"> 
    <select class="js-example-basic-multiple" multiple="multiple"> 
      <optgroup label="Alaskan/Hawaiian Time Zone"> 
        <option value="AK">Alaska</option> 
        <option value="HI">Hawaii</option> 
        <option value="">請選擇</option> 
      </optgroup> 
      <optgroup label="Pacific Time Zone"> 
        <option value="CA">California1111111111111111111111111111111111111111111111111</option> 
        <option value="NV">Nevada</option> 
        <option value="OR">Oregon</option> 
        <option value="WA">Washington</option> 
      </optgroup> 
      <optgroup label="Mountain Time Zone"> 
        <option value="AZ">Arizona</option> 
        <option value="CO">Colorado</option> 
        <option value="ID">Idaho</option> 
        <option value="MT">Montana</option> 
        <option value="NE">Nebraska</option> 
        <option value="NM">New Mexico</option> 
        <option value="ND">North Dakota</option> 
        <option value="UT">Utah</option> 
        <option value="WY">Wyoming</option> 
      </optgroup> 
      <optgroup label="Central Time Zone"> 
        <option value="AL">Alabama</option> 
        <option value="AR">Arkansas</option> 
        <option value="IL">Illinois</option> 
        <option value="IA">Iowa</option> 
        <option value="KS">Kansas</option> 
        <option value="KY">Kentucky</option> 
        <option value="LA">Louisiana</option> 
        <option value="MN">Minnesota</option> 
        <option value="MS">Mississippi</option> 
        <option value="MO">Missouri</option> 
        <option value="OK">Oklahoma</option> 
        <option value="SD">South Dakota</option> 
        <option value="TX">Texas</option> 
        <option value="TN">Tennessee</option> 
        <option value="WI">Wisconsin</option> 
      </optgroup> 
      <optgroup label="Eastern Time Zone"> 
        <option value="CT">Connecticut</option> 
        <option value="DE">Delaware</option> 
        <option value="FL">Florida</option> 
        <option value="GA">Georgia</option> 
        <option value="IN">Indiana</option> 
        <option value="ME">Maine</option> 
        <option value="MD">Maryland</option> 
        <option value="MA">Massachusetts</option> 
        <option value="MI">Michigan</option> 
        <option value="NH">New Hampshire</option> 
        <option value="NJ">New Jersey</option> 
        <option value="NY">New York</option> 
        <option value="NC">North Carolina</option> 
        <option value="OH">Ohio</option> 
        <option value="PA">Pennsylvania</option> 
        <option value="RI">Rhode Island</option> 
        <option value="SC">South Carolina</option> 
        <option value="VT">Vermont</option> 
        <option value="VA">Virginia</option> 
        <option value="WV">West Virginia</option> 
      </optgroup> 
    </select> 
  </div> 
  <h1>這是可清除有提示例子</h1> 
  <div class="s3-example"> 
    <select class="js-example-placeholder-single" style="width:200px"> 
      <optgroup label="Alaskan/Hawaiian Time Zone"> 
        <option value="AK">Alaska</option> 
        <option value="HI">Hawaii</option> 
        <option value="">請選擇</option> 
      </optgroup> 
      <optgroup label="Pacific Time Zone"> 
        <option value="CA">California1111111111111111111111111111111111111111111111111</option> 
        <option value="NV">Nevada</option> 
        <option value="OR">Oregon</option> 
        <option value="WA">Washington</option> 
      </optgroup> 
      <optgroup label="Mountain Time Zone"> 
        <option value="AZ">Arizona</option> 
        <option value="CO">Colorado</option> 
        <option value="ID">Idaho</option> 
        <option value="MT">Montana</option> 
        <option value="NE">Nebraska</option> 
        <option value="NM">New Mexico</option> 
        <option value="ND">North Dakota</option> 
        <option value="UT">Utah</option> 
        <option value="WY">Wyoming</option> 
      </optgroup> 
      <optgroup label="Central Time Zone"> 
        <option value="AL">Alabama</option> 
        <option value="AR">Arkansas</option> 
        <option value="IL">Illinois</option> 
        <option value="IA">Iowa</option> 
        <option value="KS">Kansas</option> 
        <option value="KY">Kentucky</option> 
        <option value="LA">Louisiana</option> 
        <option value="MN">Minnesota</option> 
        <option value="MS">Mississippi</option> 
        <option value="MO">Missouri</option> 
        <option value="OK">Oklahoma</option> 
        <option value="SD">South Dakota</option> 
        <option value="TX">Texas</option> 
        <option value="TN">Tennessee</option> 
        <option value="WI">Wisconsin</option> 
      </optgroup> 
      <optgroup label="Eastern Time Zone"> 
        <option value="CT">Connecticut</option> 
        <option value="DE">Delaware</option> 
        <option value="FL">Florida</option> 
        <option value="GA">Georgia</option> 
        <option value="IN">Indiana</option> 
        <option value="ME">Maine</option> 
        <option value="MD">Maryland</option> 
        <option value="MA">Massachusetts</option> 
        <option value="MI">Michigan</option> 
        <option value="NH">New Hampshire</option> 
        <option value="NJ">New Jersey</option> 
        <option value="NY">New York</option> 
        <option value="NC">North Carolina</option> 
        <option value="OH">Ohio</option> 
        <option value="PA">Pennsylvania</option> 
        <option value="RI">Rhode Island</option> 
        <option value="SC">South Carolina</option> 
        <option value="VT">Vermont</option> 
        <option value="VA">Virginia</option> 
        <option value="WV">West Virginia</option> 
      </optgroup> 
    </select> 
  </div> 
  <div class="s4-example"> 
    <select class="js-example-placeholder-multiple" multiple="multiple" style="width:400px"> 
      <optgroup label="Alaskan/Hawaiian Time Zone"> 
        <option value="AK">Alaska</option> 
        <option value="HI">Hawaii</option> 
        <option value="">請選擇</option> 
      </optgroup> 
      <optgroup label="Pacific Time Zone"> 
        <option value="CA">California1111111111111111111111111111111111111111111111111</option> 
        <option value="NV">Nevada</option> 
        <option value="OR">Oregon</option> 
        <option value="WA">Washington</option> 
      </optgroup> 
      <optgroup label="Mountain Time Zone"> 
        <option value="AZ">Arizona</option> 
        <option value="CO">Colorado</option> 
        <option value="ID">Idaho</option> 
        <option value="MT">Montana</option> 
        <option value="NE">Nebraska</option> 
        <option value="NM">New Mexico</option> 
        <option value="ND">North Dakota</option> 
        <option value="UT">Utah</option> 
        <option value="WY">Wyoming</option> 
      </optgroup> 
      <optgroup label="Central Time Zone"> 
        <option value="AL">Alabama</option> 
        <option value="AR">Arkansas</option> 
        <option value="IL">Illinois</option> 
        <option value="IA">Iowa</option> 
        <option value="KS">Kansas</option> 
        <option value="KY">Kentucky</option> 
        <option value="LA">Louisiana</option> 
        <option value="MN">Minnesota</option> 
        <option value="MS">Mississippi</option> 
        <option value="MO">Missouri</option> 
        <option value="OK">Oklahoma</option> 
        <option value="SD">South Dakota</option> 
        <option value="TX">Texas</option> 
        <option value="TN">Tennessee</option> 
        <option value="WI">Wisconsin</option> 
      </optgroup> 
      <optgroup label="Eastern Time Zone"> 
        <option value="CT">Connecticut</option> 
        <option value="DE">Delaware</option> 
        <option value="FL">Florida</option> 
        <option value="GA">Georgia</option> 
        <option value="IN">Indiana</option> 
        <option value="ME">Maine</option> 
        <option value="MD">Maryland</option> 
        <option value="MA">Massachusetts</option> 
        <option value="MI">Michigan</option> 
        <option value="NH">New Hampshire</option> 
        <option value="NJ">New Jersey</option> 
        <option value="NY">New York</option> 
        <option value="NC">North Carolina</option> 
        <option value="OH">Ohio</option> 
        <option value="PA">Pennsylvania</option> 
        <option value="RI">Rhode Island</option> 
        <option value="SC">South Carolina</option> 
        <option value="VT">Vermont</option> 
        <option value="VA">Virginia</option> 
        <option value="WV">West Virginia</option> 
      </optgroup> 
    </select> 
  </div> 
  <h1>這是直接使用js對象初始化的例子</h1> 
  <div> 
    <select class="js-example-data-array" style="width:200px"></select> 
  </div> 
  <div> 
    <select class="js-example-data-array-selected" style="width:200px"> 
      <option value="2" selected="selected">duplicate</option> 
    </select> 
  </div> 
 
  <script type="text/javascript" src="jquery-2.1.4.min.js"></script> 
  <script type="text/javascript" src="select2.min.js"></script> 
  <script type="text/javascript"> 
  $(document).ready(function() { 
    $(".js-example-basic-single").select2(); //單選 
    $(".js-example-basic-multiple").select2(); //多選 
 
    $(".js-example-placeholder-single").select2({ //允許清除 
      placeholder: "Select a state", //默認提示語 
      allowClear: true 
    }); 
 
    $(".js-example-placeholder-multiple").select2({ 
      placeholder: "Select a state" //默認提示語 
    }); 
 
 
    var data = [{ 
      id: 0, 
      text: 'enhancement' 
    }, { 
      id: 1, 
      text: 'bug' 
    }, { 
      id: 2, 
      text: 'duplicate' 
    }, { 
      id: 3, 
      text: 'invalid' 
    }, { 
      id: 4, 
      text: 'wontfix' 
    }]; 
 
    $(".js-example-data-array").select2({ 
      data: data 
    }) 
 
    $(".js-example-data-array-selected").select2({ 
      data: data 
    }) 
 
  }); 
  </script> 
</body> 
 
</html>

3、效果
效果1

效果2

還有一些其它的內容，比如果說支持通過ajax查找來填充，支持input等，想要了解更多內容的朋友請閱讀相關文章。

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