DatePicker 在引导程序 4 上不起作用

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【中文标题】DatePicker 在引导程序 4 上不起作用【英文标题】：DatePicker not working on bootstrap 4 【发布时间】：2018-05-21 03:49:35 【问题描述】：

我想在我的项目中使用 datepicker。这是我第一次使用 bootstrap。问题是当我单击日期表单时没有显示 datepicker。我已经尝试替换标签内部和内部的 CDN url 位置，但仍然没有工作。我不知道我犯了什么错误，希望你们能帮助我解决这个问题谢谢。

<!DOCTYPE html>
<html lang="en">

<head>
  <!-- Required meta tags -->
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

  <!-- Bootstrap CSS -->
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css" integrity="sha384-rwoIResjU2yc3z8GV/NPeZWAv56rSmLldC3R/AZzGRnGxQQKnKkoFVhFQhNUwEyJ" crossorigin="anonymous">

  <!-- datepicker -->
  <link rel="stylesheet" href="https://code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css">
  <link rel="stylesheet" href="/resources/demos/style.css">
  <script src="https://code.jquery.com/jquery-1.12.4.js"></script>
  <script src="https://code.jquery.com/ui/1.12.1/jquery-ui.js"></script>
  <script>
    $(function() 
      $("#datepicker").datepicker();
    );
  </script>
</head>

<body>
  <nav class="navbar navbar-toggleable-md navbar-inverse bg-inverse">
    <button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbarsExampleDefault" aria-controls="navbarsExampleDefault" aria-expanded="false" aria-label="Toggle navigation">
        <span class="navbar-toggler-icon"></span>
      </button>
    <a class="navbar-brand" href="#">Menu</a>
    <div class="collapse navbar-collapse" id="navbarsExampleDefault">
      <ul class="navbar-nav mr-auto">
        <li class="nav-item dropdown">
          <a class="nav-link dropdown-toggle" href="http://example.com" id="dropdown01" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Management</a>
          <div class="dropdown-menu" aria-labelledby="dropdown01">
            <a class="dropdown-item" href="dashboard.php?act=create_program">Create Program</a>
            <a class="dropdown-item" href="dashboard.php?act=view_program">View Program</a>
          </div>
        </li>
      </ul>
    </div>
  </nav>
  <div class="container-fluid">
    <div class="row">
      <div class="col-md-4"></div>
      <div class="col-md-4">
        <!-- Datepicker -->
        Date: <input type="text" id="datepicker">
      </div>
      <div class="col-md-4"></div>
    </div>
  </div>
  <!-- jQuery first, then Tether, then Bootstrap JS. -->
  <script src="https://code.jquery.com/jquery-3.1.1.slim.min.js" integrity="sha384-A7FZj7v+d/sdmMqp/nOQwliLvUsJfDHW+k9Omg/a/EheAdgtzNs3hpfag6Ed950n" crossorigin="anonymous"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/tether/1.4.0/js/tether.min.js" integrity="sha384-DztdAPBWPRXSA/3eYEEUWrWCy7G5KFbe8fFjk5JAIxUYHKkDx6Qin1DkWx51bBrb" crossorigin="anonymous"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/js/bootstrap.min.js" integrity="sha384-vBWWzlZJ8ea9aCX4pEW3rVHjgjt7zpkNpZk+02D9phzyeVkE+jo0ieGizqPLForn" crossorigin="anonymous"></script>
</body>

</html>

【问题讨论】：

【参考方案1】：

我已经检查了您上面的代码，它们是您项目中包含的另外两个javascripts，请从您的代码中删除这些多余的javascript

删除这些 javascript

 <script src="https://code.jquery.com/jquery-3.1.1.slim.min.js" integrity="sha384-A7FZj7v+d/sdmMqp/nOQwliLvUsJfDHW+k9Omg/a/EheAdgtzNs3hpfag6Ed950n" crossorigin="anonymous"></script>
        <script src="https://cdnjs.cloudflare.com/ajax/libs/tether/1.4.0/js/tether.min.js" integrity="sha384-DztdAPBWPRXSA/3eYEEUWrWCy7G5KFbe8fFjk5JAIxUYHKkDx6Qin1DkWx51bBrb" crossorigin="anonymous"></script>

使用此代码：

$(function() 
    $("#datepicker").datepicker();
  );
<head>
    <!-- Required meta tags -->
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

    <!-- Bootstrap CSS -->
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css" >
<!-- jQuery first, then Tether, then Bootstrap JS. -->
    
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/js/bootstrap.min.js"></script>
    <!-- datepicker -->
<link rel="stylesheet" href="https://code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css">
  <link rel="stylesheet" href="/resources/demos/style.css">
  <script src="https://code.jquery.com/jquery-1.12.4.js"></script>
  <script src="https://code.jquery.com/ui/1.12.1/jquery-ui.js"></script>


  </head>
  <body>




          <nav class="navbar navbar-toggleable-md navbar-inverse bg-inverse">
      <button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbarsExampleDefault" aria-controls="navbarsExampleDefault" aria-expanded="false" aria-label="Toggle navigation">
        <span class="navbar-toggler-icon"></span>
      </button>
      <a class="navbar-brand" href="#">Menu</a>

      <div class="collapse navbar-collapse" id="navbarsExampleDefault">
        <ul class="navbar-nav mr-auto">
          <li class="nav-item dropdown">
            <a class="nav-link dropdown-toggle" href="http://example.com" id="dropdown01" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Management</a>
            <div class="dropdown-menu" aria-labelledby="dropdown01">
              <a class="dropdown-item" href="dashboard.php?act=create_program">Create Program</a>
              <a class="dropdown-item" href="dashboard.php?act=view_program">View Program</a>
            </div>
          </li>
        </ul>
      </div>
    </nav>

    <div class="container-fluid">
    <div class="row">

      <div class="col-md-4"></div>
      <div class="col-md-4">
            <!-- Datepicker -->
            Date: <input type="text" id="datepicker">
      </div>
      <div class="col-md-4"></div>

    </div>
    </div>


    
  </body>

【讨论】：

【参考方案2】：

您要导入 jQuery 两次（1.12.4 和 3.1.1）。移除 v1.12.4 并将 jquery-ui.js 移至底部（在 jQuery 3.1.1 之后）。

【讨论】：

【参考方案3】：

您的代码运行良好，但您需要更改格式。底部来源有问题。

jquery 冲突问题

  $( function() 
    $( "#datepicker" ).datepicker();
   );
<script src="https://code.jquery.com/jquery-3.1.1.slim.min.js" integrity="sha384-A7FZj7v+d/sdmMqp/nOQwliLvUsJfDHW+k9Omg/a/EheAdgtzNs3hpfag6Ed950n" crossorigin="anonymous"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/tether/1.4.0/js/tether.min.js" integrity="sha384-DztdAPBWPRXSA/3eYEEUWrWCy7G5KFbe8fFjk5JAIxUYHKkDx6Qin1DkWx51bBrb" crossorigin="anonymous"></script>
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/js/bootstrap.min.js" integrity="sha384-vBWWzlZJ8ea9aCX4pEW3rVHjgjt7zpkNpZk+02D9phzyeVkE+jo0ieGizqPLForn" crossorigin="anonymous"></script>
        <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css" integrity="sha384-rwoIResjU2yc3z8GV/NPeZWAv56rSmLldC3R/AZzGRnGxQQKnKkoFVhFQhNUwEyJ" crossorigin="anonymous">

    <!-- datepicker -->
<link rel="stylesheet" href="https://code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css">
  <link rel="stylesheet" href="/resources/demos/style.css">
  <script src="https://code.jquery.com/jquery-1.12.4.js"></script>
  <script src="https://code.jquery.com/ui/1.12.1/jquery-ui.js"></script>
          <nav class="navbar navbar-toggleable-md navbar-inverse bg-inverse">
      <button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbarsExampleDefault" aria-controls="navbarsExampleDefault" aria-expanded="false" aria-label="Toggle navigation">
        <span class="navbar-toggler-icon"></span>
      </button>
      <a class="navbar-brand" href="#">Menu</a>

      <div class="collapse navbar-collapse" id="navbarsExampleDefault">
        <ul class="navbar-nav mr-auto">
          <li class="nav-item dropdown">
            <a class="nav-link dropdown-toggle" href="http://example.com" id="dropdown01" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Management</a>
            <div class="dropdown-menu" aria-labelledby="dropdown01">
              <a class="dropdown-item" href="dashboard.php?act=create_program">Create Program</a>
              <a class="dropdown-item" href="dashboard.php?act=view_program">View Program</a>
            </div>
          </li>
        </ul>
      </div>
    </nav>




    <div class="container-fluid">
    <div class="row">

      <div class="col-md-4"></div>
      <div class="col-md-4">
            <!-- Datepicker -->
            Date: <input type="text" id="datepicker">
      </div>
      <div class="col-md-4"></div>

    </div>
    </div>

【讨论】：

【参考方案4】：

我认为您也应该添加“popper.js”文件，因为 Bootstrap 4 弹出元素依赖于 popperjs。

Popper.js

【讨论】：

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