javascript - Check date on text focus out not working -


i want when user has entered date , text focus out cursor moved somewhere else, if date not in dd/mm/yyyy format , date out of range, error message should displayed...

function isvalid(str) {    var ispattern = /^ (0?[1 - 9] |[12][0 - 9] | 3[01])[\/\/](0?[1 - 9] | 1[012])[\/\/]\d{ 4}$/.test(str);    if (!ispattern) return false;    var d = new date(str);    return (!isnan(d));  }    $(document).ready(function() {    $("#newstartdate").bind("onfocusout", function(e) {      var val = this.value;      if (!isvalid(val))        alert("hello");    });  });
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>    <input id="newstartdate" data-mask="99/99/9999" type="text" style="width: 100px;" placeholder="start date(dd/mm/yyy)" required>

please !!!

try use on blur instead of onfocusout

example below.

function isvalid(str) {    var ispattern = /^(0?[1-9]|[12][0-9]|3[01])[\/\/](0?[1-9]|1[012])[\/\/]\d{4}$/.test(str);    if (!ispattern) return false;    var d = new date(str);    return (!isnan(d));  }    $(document).ready(function() {    $("#newstartdate").bind("blur", function(e) {      var val = this.value;      console.log(!isvalid(val))      if (!isvalid(val))        alert("hello");    });  });
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>  <input id="newstartdate" data-mask="99/99/9999" type="text" style="width: 100px;" placeholder="start date(dd/mm/yyy)" required>


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