每次打开日期范围选择器对话框时如何显示警报？

Question

我正在尝试在我的网络项目中实施 date range picker。我已按照文档中描述的所有步骤进行操作：

<script type="text/javascript" src="https://cdn.jsdelivr.net/jquery/latest/jquery.min.js"> </script>

<script type="text/javascript" src="https://cdn.jsdelivr.net/momentjs/latest/moment.min.js"></script>

<script type="text/javascript" src="https://cdn.jsdelivr.net/npm/daterangepicker/daterangepicker.min.js"></script>

<link rel="stylesheet" type="text/css" href="https://cdn.jsdelivr.net/npm/daterangepicker/daterangepicker.css" />

<input type="text" name="datefilter" value="" />

<script type="text/javascript">
    $(function() {

        $('input[name="datefilter"]').daterangepicker({
             autoUpdateInput: false,
             locale: {
                 cancelLabel: 'Clear'
             }
        });

        $('input[name="datefilter"]').on('apply.daterangepicker', function(ev, picker) {
             $(this).val(picker.startDate.format('MM/DD/YYYY') + ' - ' + 
             picker.endDate.format('MM/DD/YYYY'));
        });

        $('input[name="datefilter"]').on('cancel.daterangepicker', function(ev, picker) {
            $(this).val('');
        });
    });
</script>

现在我想在每次显示 date range picker 对话框时显示一个 alert("You have opened datepicker")。我该怎么做？

Answer 1

使用show.daterangepicker event 显示警报。这是一个工作代码。我添加了在 show.daterangepicker 事件上显示警报的功能。我使用了 setTimeout 以便在下拉列表出现之前警报不会阻止 UI。

<script type="text/javascript" src="https://cdn.jsdelivr.net/jquery/latest/jquery.min.js"></script>

<script type="text/javascript" src="https://cdn.jsdelivr.net/momentjs/latest/moment.min.js"></script>

<script type="text/javascript" src="https://cdn.jsdelivr.net/npm/daterangepicker/daterangepicker.min.js"></script>

<link rel="stylesheet" type="text/css" href="https://cdn.jsdelivr.net/npm/daterangepicker/daterangepicker.css" />

<input type="text" name="datefilter" value="" />

<script type="text/javascript">
    $(function() {

        $('input[name="datefilter"]').daterangepicker({
             autoUpdateInput: false,
             locale: {
                 cancelLabel: 'Clear'
             }
        });

        $('input[name="datefilter"]').on('apply.daterangepicker', function(ev, picker) {
             $(this).val(picker.startDate.format('MM/DD/YYYY') + ' - ' + 
             picker.endDate.format('MM/DD/YYYY'));
        });

        $('input[name="datefilter"]').on('cancel.daterangepicker', function(ev, picker) {
            $(this).val(''); 
        });
        
        $('input[name="datefilter"]').on('show.daterangepicker', function(ev, picker) {
            setTimeout(function(){
                alert("You have opened datepicker");
            }, 0);
        });
        
    });
</script>

每次打开日期范围选择器对话框时如何显示警报？

How to show an alert everytime date range picker dialog is opened?

html

javascript

bootstrap-daterangepicker