2 questions in JS

[Isa]

Hi every one !

1. I would like to know why \t and \n are not recognize. Is there a
version of Js that we must specify ? Also why document.write(...) and
writeln(...) give the same result ? Isn't supposed to have a newline
with writeln?

2. I would like to know more about Object oriented in JS. Here is my
code and I would like to know why it's not working? What am I doing
wrong ?

function Rectangle(l, h) { // constructor
this.largeur = l;
this.hauteur = h;
}

var rect1 = new Rectangle(2,4);
document.writeln("area of rect1 " + rect1.area( ) ); //<- area is not
called or accessed :-(

function area( ) {
return this.largeur * this.hauteur;
}

Thank you very much !

 

[web.dev]

Hi every one !

1. I would like to know why \t and \n are not recognize. Is there a
version of Js that we must specify ? Also why document.write(...) and
writeln(...) give the same result ? Isn't supposed to have a newline
with writeln?

The writeln method is the same as the write method, except the writeln
method appends a newline character to the end of the output. HTML
ignores the newline character, except within certain tags such as the
PRE tag. For example:

<pre>
<script type = "text/javascript">
document.writeln("hello");
document.writeln("world");
</script>

2. I would like to know more about Object oriented in JS. Here is my
code and I would like to know why it's not working? What am I doing
wrong ?

function Rectangle(l, h) { // constructor
this.largeur = l;
this.hauteur = h;
}

var rect1 = new Rectangle(2,4);
document.writeln("area of rect1 " + rect1.area( ) ); //<- area is not
called or accessed :-(

function area( ) {
return this.largeur * this.hauteur;
}

It is not working because your area() method is not a member of
Rectangle. Try the following instead:

function Rectangle(l, h)
{
this.largeur = l;
this.hauteur = h;
}

Rectangle.prototype.area = function()
{
return this.largeur * this.hauteur;
}

var rect1 = new Rectangle(2, 4);

alert("Area of rect1: " + rect1.area());

 

[Dr John Stockton]

JRS: In article <[email protected]>,
dated Wed, 27 Sep 2006 10:04:44 remote, seen in

Isa wrote:

The writeln method is the same as the write method, except the writeln
method appends a newline character to the end of the output. HTML
ignores the newline character, except within certain tags such as the
PRE tag.

Newline is not ignored; it counts as whitespace, a separator, in
ordinary HTML.

It is well to generate a reasonable number of newlines in script-
generated HTML, if there is any chance that it will be read by a human,
a validator, etc.

It's a good idea to read the newsgroup and its FAQ. See below.