Javascript / InDesign：检查对象是否具有某些属性

Question

I'm using Javascript for InDesign scripting.

I have an image object and want to know it's bounds (the one that the user sees) -

bounds = (geometricBounds in image.parent)? image.parent.geometricBounds: image.geometricBounds;

returns ReferenceError - geometricBounds is undefined . This error comes when the parent to the image is an Oval object (So, I know geometricBounds property is there for an Oval object).

The problem is in (geometricBounds in image.parent) because when I alerted this statement, I got the same error. I'm surely missing something - because if this is not a property then I should simply get a false.

Any one knows why this is happening?

Answer 1

in运算符检查属性名称是否为字符串（在您的情况下，它正在查找名为geometricBounds的变量 - 可能包含属性名称字符串 - 显然未在任何地方声明）：

bounds = ('geometricBounds' in image.parent)? image.parent.geometricBounds: image.geometricBounds;