Jquery – selector, made of object and string, can it be done

concatenationcss-selectorsjqueryobjectstring

Assume that there is an object, passed as an argument to a function. the argument name is "obj".
can it be concatenated as followed?

$(obj + " .className")......

$(obj + "[name='obj_name'])......

Thanks.

No, but you can use the filter() method to filter out the object itself:

$(obj).filter('.className')...
$(obj).filter('[name=obj_name]')...

Or, if you want to find the children with those qualities:

$(obj).find('.className')...
$(obj).find('[name=obj_name]')...

Or, an alternative syntax to find, giving the obj as the context to the $() function:

$('.className', obj)...
$('[name=obj_name]', obj)...

Assuming module foo with method bar:

import foo
method_to_call = getattr(foo, 'bar')
result = method_to_call()

You could shorten lines 2 and 3 to:

result = getattr(foo, 'bar')()

if that makes more sense for your use case.

You can use getattr in this fashion on class instance bound methods, module-level methods, class methods... the list goes on.

string is an alias in C# for System.String.
So technically, there is no difference. It's like int vs. System.Int32.

As far as guidelines, it's generally recommended to use string any time you're referring to an object.

e.g.

string place = "world";

Likewise, I think it's generally recommended to use String if you need to refer specifically to the class.

e.g.

string greet = String.Format("Hello {0}!", place);

This is the style that Microsoft tends to use in their examples.

It appears that the guidance in this area may have changed, as StyleCop now enforces the use of the C# specific aliases.