当我从jQuery
设置选项时,我试图添加一个空的<option></option>
,但当加载页面时,第一个选项被选中。我添加了allowClear: true, placeholder: "Select...",
,但它不起作用。
我找到了一个绕过的方法,在初始化select2
后清除该选项,这很有效,但有更好的解决方案吗?
$(".select2-it").val(null).trigger('change');
var itData = [{
id: 0,
text: 'Apps',
children: [{
id: '1',
text: 'App1'
},
{
id: '2',
text: 'App2'
},
{
id: '3',
text: 'App3'
}
]
},
{
id: 4,
text: 'bug'
},
{
id: 5,
text: 'duplicate'
}
];
$(".select2-it").select2({
allowClear: true,
placeholder: "Select...",
data: itData,
width: "100%"
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/select2@4.1.0-rc.0/dist/js/select2.min.js"></script>
<link href="https://cdn.jsdelivr.net/npm/select2@4.1.0-rc.0/dist/css/select2.min.css" rel="stylesheet" />
<select id="it-target" class="select2-it form-control"></select>
在对输入调用Select2初始值设定项之前,可以在DOM元素中预先设置空选项(使用.prepend(((。
var itData = [{
id: 0,
text: 'Apps',
children: [
{ id: '1', text: 'App1' },
{ id: '2', text: 'App2' },
{ id: '3', text: 'App3' }
]
}, {
id: 4,
text: 'bug'
}, {
id: 5,
text: 'duplicate'
}];
$(".select2-it").prepend('<option></option>').select2({
allowClear: true,
placeholder: "Select...",
data: itData,
width: "100%"
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/select2@4.1.0-rc.0/dist/js/select2.min.js"></script>
<link href="https://cdn.jsdelivr.net/npm/select2@4.1.0-rc.0/dist/css/select2.min.css" rel="stylesheet" />
<select id="it-target" class="select2-it form-control"></select>