Any body has any idea about this error,
TypeError: Unable to get value of the property 'pop': object is null or undefined:
Hi bru.scopelliti,
Here the code is:
someNode.innerHTML = _self.errorMessage + " : " + ioArgs.xhr.status + " : " +response.responseText;
The thing is the response object doesn't have responseText
You might want to check for any extra commas that you may have inadvertently added or forgotten to remove. IE does not honour it.
var foo = {
a: 1,
b: 2,
c: 3, // this last comma will give an error in IE.
}
Hope this helps.
foo, in this example, to be undefined, and therefore accessing .pop of it would not be allowedThis error occurs when the object is null or undefined when you want to acces a property.
var x = undefined;
var y = null;
alert(x.pop); // error
alert(x.pop); // error
If you want to check if the object is null you can just do:
if (response) {
// Do stuff
}
If you want to check if the object property exists you can do:
if (response) {
var value = response.responeText || defaultValue
}
Edit: From the comments:
There's a few ways for checking for something being defined, but if (something) or var x = y || z; is not the way to go because falsey values (0, '', etc.) would cause this to not work. If you want to see if something is defined, I would use if (typeof x === "undefined"). For checking for a property in an object, I would use if (x in obj), or possibly better depending on the scenario - if (obj.hasOwnProperty(x)). And for checking for null, I would use if (x == null)
undefined. If you try to do something to it, like x.pop.call(this) or whatever, then it would complain.
var x = undefined; alert(x.pop) returns TypeError: Cannot read property 'pop' of undefined, for me. Same for null. It might be browser-dependent. (Firefox also returns a TypeError)undefined or null object, it's an exception. If you saw Arninja's original post, they were saying x.pop would throw an error for var x = { foo: "bar" }; which wasn't right, because the object we're accessing, x, is defined. x.pop will be resolved as undefined