Set multiple datepickers' value based on one datepicker's selected date
I have follow jQuery UI Datepicker sample code
jQ
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<span>2021-01-23 02:02</span>
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<p>You can use the onSelect event and call setDate method:</p>
<pre><code>$("#datepicker1, #datepicker2, #datepicker3, #datepicker4").datepicker();
$("#datepicker1").datepicker("option", "onSelect", function (dateText, inst) {
var date1 = $.datepicker.parseDate(inst.settings.dateFormat || $.datepicker._defaults.dateFormat, dateText, inst.settings);
var date2 = new Date(date1.getTime());
date2.setDate(date2.getDate() + 1);
$("#datepicker2").datepicker("setDate", date2);
var date3 = new Date(date1.getTime());
date3.setDate(date3.getDate() + 2);
$("#datepicker3").datepicker("setDate", date3);
var date4 = new Date(date1.getTime());
date4.setDate(date4.getDate() + 3);
$("#datepicker4").datepicker("setDate", date4);
});
</code></pre>
<p>Demo here</p>
<hr>
<p>The <code>onSelect</code> passes the date as a string so we convert it to JavaScript Date object for convenience, using the following jQuery UI datepicker utility function:</p>
<pre><code>$.datepicker.parseDate( format, value[, settings] )
</code></pre>
<p>The expression:</p>
<pre><code>inst.settings.dateFormat || $.datepicker._defaults.dateFormat
</code></pre>
<p>means use the <code>dateFormat</code> value specified on the datepicker, if there is one; otherwise use the <code>dateFormat</code> from datepicker defaults (which is <code>"mm/dd/yy"</code>).</p>
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