无法读取undefined select2的属性'id'

I used Select2 4.0.6, I have a bug like below:

我用的是Select2 4.0.6，我有一个如下的bug：

allowClear gives "Uncaught TypeError: Cannot read property 'id' of undefined" when used on select.

allowClear在select上使用时给出“未捕获的TypeError：无法读取未定义的属性'id'”。

How can I fix this bug?.

我该如何修复这个错误？

<!DOCTYPE html>
<html>
<head>
    <title></title>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
	    <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
	<link href="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.6-rc.0/css/select2.min.css" rel="stylesheet" />
	<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.6-rc.0/js/select2.min.js"></script>
</head>
<body>
	<select role="select" id="myoption">
		<option value="001">abcs </option><option value="002">dshdsh</option><option value="003">A</option>
		<option value="004">ANAM CO</option>
	</select>

</body>
</html>
<script>
 $("#myoption").select2({
        allowClear: true,
        width: '300px',
        height: '34px'
        //data: data
    });
</script>

1 个解决方案

#1

If you set the debug property to true you'll see a warning message.

如果将debug属性设置为true，则会看到警告消息。

The allowClear option should be used in combination with the placeholder option.

allowClear选项应与占位符选项结合使用。

<!DOCTYPE html>
<html>
<head>
    <title></title>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
	    <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
	<link href="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.6-rc.0/css/select2.min.css" rel="stylesheet" />
	<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.6-rc.0/js/select2.min.js"></script>
</head>
<body>
	<select role="select" id="myoption">
		<option value="001">abcs </option><option value="002">dshdsh</option><option value="003">A</option>
		<option value="004">ANAM CO</option>
	</select>

</body>
</html>
<script>
 $("#myoption").select2({
        allowClear: true,
        width: '300px',
        height: '34px',
        debug: true
        //data: data
    });
</script>

So you have to define a placeholder as default.

因此，您必须将占位符定义为默认值。

<!DOCTYPE html>
<html>
<head>
    <title></title>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
	    <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
	<link href="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.6-rc.0/css/select2.min.css" rel="stylesheet" />
	<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.6-rc.0/js/select2.min.js"></script>
</head>
<body>
	<select role="select" id="myoption">
		<option value="001">abcs </option><option value="002">dshdsh</option><option value="003">A</option>
		<option value="004">ANAM CO</option>
	</select>

</body>
</html>
<script>
 $("#myoption").select2({
        allowClear: true,
        width: '300px',
        height: '34px',
        placeholder :'select..'
        //data: data
    });
</script>

#1