我在github here上找到了Select2的启动插件，似乎无法在我的网站上正常工作。我将在下面粘贴我的代码。我无法确定服务器上是否已经有太多竞争的CSS，或者我只是将东西放置在错误的位置。我对使用这些东西有点陌生，但我正在努力弄清所有这些东西。
<?php
/*==================================================================================
README:
This global var (`root_dir`) must be set to the relative path
of the root directory.
E.g.
If this page is in "career.clemson.edu/coop/"
then the line should read
$GLOBALS["root_dir"]="../";
or if this page is in "career.clemson.edu/coop/students/";
then the line should read
$GLOBALS["root_dir"]="../../";
The template automatically includes common meta elemtents (keywords, etc),
common CSS files (ours, bootstrap, font-awesome), a fallback fon non-HTML5 compliant
browsers, and some basic javasript files at the end of the page.
Feel free to add any other things as needed on a per page basis!
All includes *should* in %root_dir%/includes
==================================================================================*/
$GLOBALS["root_dir"]="../";
require_once $GLOBALS["root_dir"].'includes.inc';
?>
<!doctype html>
<html lang="en">
<html>
<head>
<meta charset="UTF-8">
<?php
require_once $GLOBALS['include_loc']."common_meta.inc";
require_once $GLOBALS['include_loc']."common_css.inc";
require_once $GLOBALS['include_loc']."html5_shiv.inc";
?>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css"> <!-- Latest compiled and minified CSS -->
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/css/select2.min.css">
<title>Resumes and Cover Letters</title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script> <!-- jQuery library -->
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script> <!-- Latest compiled JavaScript -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/js/select2.min.js"></script>
</head>
<body>
<?php require_once $GLOBALS["include_loc"]."top_menu.inc";?> <!-- Top Menu -->
<div class span="row">
<script type="text/javascript">
$(".js-example-placeholder-multiple").select2({
placeholder: "Select a state"
});
</script>
<select class="js-example-placeholder-multiple">
<option value="AL">Alabama</option>
...
<option value="WY">Wyoming</option>
</select>
<?php require_once $GLOBALS["include_loc"]."footer.inc";?> <!-- Footer -->
<?php require_once $GLOBALS['include_loc']."basic_js.inc"; ?> <!--Include JS Files at the end for speed-->
</body>
</html>
最佳答案
这里有四件事是错的。
您尚未包括Bootstrap JS。
为此，只需包括以下内容：
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
在
<head>标记或<body>标记中。您也没有包含jQuery。 Bootstrap和select2都需要jQuery。
要包含jQuery，请插入以下代码：
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
在
<head>标记或<body>标记中，但请确保它在Bootstrap和select2 JS之前。您的
<select>具有类js-example-basic-single，但是您正在类js-example-placeholder-multiple上调用select2插件。解决此问题，插件应能正常工作。
（这是次要的）此div：
<div class span="row">在代码中未用</div>关闭。另外，<div class span="row">似乎不太正确。$(".js-example-basic-single").select2({
placeholder: "Select a state"
});<html>
<head>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/css/select2.min.css">
<title>Resumes and Cover Letters</title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/js/select2.min.js"></script>
</head>
<body>
<!-- Top Menu -->
<div class span="row">
<select class="js-example-basic-single">
<option value="AL">Alabama</option>
<option value="WY">Wyoming</option>
</select>
</div>
</body>
</html>关于javascript - Bootstrap CSS无法正确加载，看起来像是典型的HTML/CSS下拉菜单，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/45739497/