[英]Select2: How to get previous selected values
I am using select v4.0.3.我正在使用选择 v4.0.3。 How do I get the replaced/previous value of the select element?
如何获取 select 元素的替换/先前值? I already attached a 'change' listener but I can't seem to find the previous value.
我已经附加了一个“更改”侦听器,但似乎找不到以前的值。
Previously selected value can be acquired by using select2:selecting
event可以使用
select2:selecting
事件获取之前选择的值
see the codes here: https://codepen.io/jacobgoh101/pen/ZpGvkx?editors=1111请参阅此处的代码: https : //codepen.io/jacobgoh101/pen/ZpGvkx?editors=1111
$('select').on('select2:selecting', function (evt) {
console.log('previously selected ' + $('select').val());
});
$('select').on('select2:select', function (evt) {
console.log('now selected ' + $('select').val());
});
You can do it easily in selecting event您可以轻松地选择事件
$(this).on("select2-selecting", function (e) {
var curentValue = e.val;
var previousValue = $(this).val();
});
var oldname;//global declaration
$('select').on('select2:selecting', function (evt) {
oldName= $('select').val();
});
$(select).on("select2:select select2:unselecting", function (e) {
//For selecting the new option
var currentName= $(this).select2('data')[0].text;
console.log(oldName);//you can get old name here also
});
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