不太确定这是怎么回事，因为我相信我是按照 Select2 网站上的说法复制的。我也相信我已经通过 CDN 正确加载了它需要的必要文件。我知道 Select2 函数的调用有问题，因为我把它完全去掉了，它看起来仍然一样，尽管缺少所有的 select2 类代码。我觉得我已经把所有东西都拿出来了，并尽我所能改变了一切，但我仍然没有让它发挥作用。我真的认为它会像复制 CDN 链接一样简单，并像 Select2 网站上的示例那样调用函数，但我的网站似乎没有正确接受代码。我将附上我在我的网站上看到的图片以及下面的代码。我还将附上一张它应该是什么样子的图片。提前致谢!
<?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>
</div>
<?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
您需要在 HTML 元素之后移动您的 js(否则 js 无法找到该元素(尚不存在))。
还有:
您应该将您的 js 库移动到
</body>之前标签使用
$( document ).ready(function() { ... });) to wrap your js code, js should run only after DOM is ready.
.centered {
text-align: center;
}<!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>
</head>
<body>
<?php require_once $GLOBALS["include_loc"]."top_menu.inc";?>
<!-- Top Menu -->
<div class="centered" span="row">
<select class="js-example-placeholder-multiple">
<option value="AL">Alabama</option>
...
<option value="WY">Wyoming</option>
</select>
</div>
<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>
<script type="text/javascript">
$( document ).ready(function() {
$(".js-example-placeholder-multiple").select2({
placeholder: "Select a state",
width: 150
});
});
</script>
<?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>关于javascript - Select2 在网站上无法正常工作，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/45888519/