Why is the Address of the User “undefined” in the following javascript?

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<html>
<head>
<script src="http://code.jquery.com/jquery-1.10.1.min.js"></script>
<script>
    var user = {
        name: "Doe, John",
        location: {
            address: "123 Main Street",
            city: "New York",
            state: "NY",
            zip: "10001",
            showAddress: function(){
                alert('The address of this user is: ' + this.location.address);
            }
        }
    };
</script>
</head>
<body>
<div>Why does the alert in the showAddress() function above say that "The address of this user is: undefined"?</div>
<div><button id="run" >Run</button></div>
<script>
    $(function(){
        $("#run").click(user.location.showAddress);
    });
</script>
</body>
</html>

Posted 13-Aug-15 1:33am

Member 11906433

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2 solutions

Solution 2

var user = {
name: "Doe, John",
location: {
address: "123 Main Street",
city: "New York",
state: "NY",
zip: "10001",
showAddress: function(){
alert('The address of this user is: ' + <b>this.address</b>);
}
}
};

Posted 13-Aug-15 2:24am

eagertolearnguy

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Shmuel Zang · Accepted Answer · 2015-08-13T01:48:00

Solution 1

Use this.address instead of this.location.address.

The showAddress function is called from location. So, this points to location - not to user...

Posted 13-Aug-15 1:48am

Shmuel Zang

Updated 13-Aug-15 1:53am

v2