Testing for undefined

[Todd Cary]

If I execute

var d = document.getElementById("menuBar");
var c = d.childNodes;
for (var i=0; i<c.length; i++) {
alert(c.menu);
}

I get 3 strings and 6 undefined's (expected).

If I execute

var d = document.getElementById("menuBar");
var c = d.childNodes;
for (var i=0; i<c.length; i++) {
if(c.menu)
alert(c.menu);
}

I get 3 strings and 2 undefined's.

Confused! I only want the strings....

Todd

 

[Fred Oz]

If I execute

[...]

You need to post menuBar's HTML

 

[Grant Wagner]

If I execute

var d = document.getElementById("menuBar");
var c = d.childNodes;
for (var i=0; i<c.length; i++) {
alert(c.menu);
alert(c.menu);

}

I get 3 strings and 6 undefined's (expected).

If I execute

var d = document.getElementById("menuBar");
var c = d.childNodes;
for (var i=0; i<c.length; i++) {
if(c.menu)

if (c.menu)

alert(c.menu);
alert(c.menu);

}

I get 3 strings and 2 undefined's.

Confused! I only want the strings....

if ('string' == typeof c.menu)

Some of those childNodes will most likely be empty text nodes, which are
unlikely to have your -menu- property.

 

[Todd Cary]

If I execute

var d = document.getElementById("menuBar");
var c = d.childNodes;
for (var i=0; i<c.length; i++) {
alert(c.menu);

alert(c.menu);


}

I get 3 strings and 6 undefined's (expected).

If I execute

var d = document.getElementById("menuBar");
var c = d.childNodes;
for (var i=0; i<c.length; i++) {
if(c.menu)

if (c.menu)

alert(c.menu);

alert(c.menu);


}

I get 3 strings and 2 undefined's.

Confused! I only want the strings....

if ('string' == typeof c.menu)

Some of those childNodes will most likely be empty text nodes, which are
unlikely to have your -menu- property.

After reading the responses to my messages and doing some research, I
need to completely rewite the script and use DOM core 2 standards. With
that in mind, I will stick to Class and ID properties.

Todd