Member Avatar for azegurb

Hi all again,
i have read tutorial about javascript classical inheritance Douglas Crockford wrote. But i did an example for the reason practizing as it showed in his page http://www.crockford.com/javascript/inheritance.html
for ex i did the following example.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
<script>

function Parenizor(value) {
    this.setValue(value);
}

Parenizor.method('setValue', function (value) {
    this.value = value;
    return this;
});

Parenizor.method('getValue', function () {
    return this.value;
});

Parenizor.method('toString', function () {
    return '(' + this.getValue() + ')';
});
myParenizor = new Parenizor(0);
myString = myParenizor.toString();
alert(myString);



</script>

</head>

<body>
</body>
</html>

But it doesnt work. it shows an error. maybe wherever i did mistake. If possible please help to find out problem. Thanks inadvance for attention

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  • Latest Post Latest Post by azegurb
Member Avatar for stultuske

what error does it show?

Member Avatar for azegurb

it shows nothing. but it must show an alert box

Member Avatar for stultuske

I don't see your function actually being called anywhere.

Member Avatar for azegurb

I don't see your function actually being called anywhere.

i called it here like this
from line 24 to 26

myParenizor = new Parenizor(0);
myString = myParenizor.toString();
alert(myString);
Member Avatar for stultuske

and where do you call that? I see no 'onClick', no 'onLoad', no jQuery code that's used to call your code when the page loads.

I've never used inheritance in javascript, so I'm not sure what the issue is, but I doubt that code is ran automatically

Member Avatar for azegurb

and where do you call that? I see no 'onClick', no 'onLoad', no jQuery code that's used to call your code when the page loads.

I've never used inheritance in javascript, so I'm not sure what the issue is, but I doubt that code is ran automatically

can you show me how to use it? But even if i call it with onclick or smth like that. it will not show anything

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