Unable to Access Custom Property

[donnapep]

Hi,

I'm having trouble accessing a custom property that I've created for an object. Does anyone see the problem with this code? this.imageSrcs is undefined inside of getImages.

Gallery.prototype.imageSrcs = new Array();

Gallery.prototype.getImages = function(json) {
if (json) {
for (var row = 0; row < json.rows.length; row++) {
this.imageSrcs.push(json.rows[row].c[0].v);
}
}
}

[toicontien]

How is getImages() being called? Is it the callback to an AJAX request? Depending on how you call that function, the "this" keyword might not point to the object you think it's pointing to.

[donnapep]

Yes, it's a callback function that is executed after data has been read from a spreadsheet. How would I go about getting access to this property then?

[Tcobb]

I don't know if this is your problem or not. One thing I don't know is what 'Gallery' really is. Is it a constructor? Consider the following:

function blob(){}; //create a constructor function for a 'blob' object

var v = new blob(); //create a blob

v.prototype.imageSrcs = new Array('1','2','3');//this causes an error when you use it on an instance of a blob
blob.prototype.imageSrcs = new Array('1','2','3');  //this works, because blob is a constructor

 


window.onload = function(){alert(v.imageSrcs);}  //this works--it will display your array

window.onload = function(){alert(blob.imageSrcs);}  // this won't work--imageSrcs shows as undefined

I hope this makes sense.

[toicontien]

donnapep, can you post the code that's calling the getImages() function? I suspect that's the cause of your problem.