How to print a rectangle construct variabe in JavaScript?

[cjeffwang]

I am doing examples in "javascript: the Definitive Guide." For Example

8-1, a rectangle constructor function, how do I print/write the
rectagle (x,y)?
Here is the JavaScript program:
function Rectangle(w, h)
{
this.width = w;
this.height = h;

}
var rect1 = new Rectangle(2, 4);
var rect2 = new Rectangle(8.5, 11);

I tried to print "Rectangle (2,4)", by coding:
document.write("<h2>Rectangle</h2>");
document.write(rect1);
Previewing on FrontPage showed: Rectangle [object Object]
TIA,
Jeffrey

[Joakim Braun]

<cj*******@gmail.com> skrev i meddelandet
news:11*********************@g47g2000cwa.googlegro ups.com...

I am doing examples in "javascript: the Definitive Guide." For Example

8-1, a rectangle constructor function, how do I print/write the
rectagle (x,y)?
Here is the JavaScript program:
function Rectangle(w, h)
{
this.width = w;
this.height = h;

}
var rect1 = new Rectangle(2, 4);
var rect2 = new Rectangle(8.5, 11);

I tried to print "Rectangle (2,4)", by coding:
document.write("<h2>Rectangle</h2>");
document.write(rect1);

If you want do print "Rectangle(2,4)", then that's what you'll have to give
to document.write.
Objects aren't turned to strings by magic.

You can access the rectangle properties, and could write a function such as:

function writeRectangle(inRect){
document.write("Rectangle(" + inRect.width + ", " + inRect.height +
")");
}

--
Joakim Braun

[Duncan Booth]

wrote:

document.write("<h2>Rectangle</h2>");
document.write(rect1);
Previewing on FrontPage showed: Rectangle [object Object]

If you want a sensible representation of an object you have to tell the
system how to convert it to a string.

Try adding this after your definition of the Rectangle function:

Rectangle.prototype.toString = function() {
return "Rectangle("+this.width+","+this.height+")";
}

[cjeffwang]

Thanks.