Evaluating whether an object is null in javascript

Question

My action specifies, let's say, an email address:

private String email;
public String getEmail() {
  return email;
}

But sometimes, the action can just not fill in the email, keeping it null. How can I evaluate this scenario in jquery?
Something like this definitely did not help:

<script type="text/javascript">
  $(document).ready(function() {
    if (${email}) {
      //do something
    } else {
      //do another thing
    }
</script>

Just a side note - adding quotes is all you need to do for this to work as the empty string will evaluate as false. — Damyan Petev
– Damyan Petev, Commented Jan 10, 2013 at 17:15

GriffeyDog · Accepted Answer · 2013-01-10 17:10:54Z

1

Javascript:

var myVar = "${email}";
if (myVar !== "") {
} else {
}

answered Jan 10, 2013 at 17:10

GriffeyDog

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Zim84 · Accepted Answer · 2013-01-10 16:54:31Z

0

You can check the variable with typeof https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Operators/typeof

answered Jan 10, 2013 at 16:54

Zim84

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1 Comment

Viccari Over a year ago

In this case, I cannot. When the email is null, the javascript on the client would be generated like if (typeof()) {

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