Cycling object properties

[Snart]

Hi

 

Is there a way to cycle through a javascript object's properties?  For example:

 

car.type = "";

car.brand = "";

 

for(var i in car)

{

  alert(i);

}

 

I simply need to know all possible properties of an object, not their contents.  The above doesn't seem to work, though.

 

Cheers

[rhodesa]

you almost had it. "i" in your example is key for car, not the value. so it should be like this:

 

<script>
car = new Object();
car.type = "type";
car.brand = "brand";

for(var i in car)
{
  alert(car[i]);
}
</script>

[Snart]

Thanks, but that is just the issue.  I don't need the values, I need the property names.  Suppose I have a "car" object with only 3 possible properties:

 

car.type = "SUV"

car.brand = "Ford"

car.color = "Blue"

 

The thing is, I only know that I can use the "car" object.  I don't know which properties it supports.  So I need something like:

 

//Show me all properties

var x = "You can use: ";

for(var i in car)

{

  x = x + i + " ";

}

 

alert(x); //Outputs: "You can use type brand color". 

 

So now I know that car.licenseplate will not work.  "car" is not an object I made, it is part of an app I use and I need to know what properties I can use with it (no documentation available on the app).

[rhodesa]

the code you just posted worked for me....

 

you may also want to look into the Firebug plugin for Firefox. It will let you look at an object and it's properties without having to use JavaScript to alert it out