Search jQuery

jQuery Forum

Callback Context problem

in Getting Started • 11 years ago

Hello. First of all, i apologize for my English. I have a problem with a context of a variable.I have a class in JS, (created using prototype) named, for example, MyClass. That class has a method, named for example, myMethod and has a attribute named, for example, myAttribute. The issue is that i have to iterate over a set of nodes (using each), and then, for example, alert the content of myAttribute. To be more explicit:

var MiClass = function () { this.messageAlert = "Hello"; }; MiClase.prototype.showAlert = function () { $(".nodes").each( function(index,element) { alert(this.messageAlert); }); };

In this example, the code shows undefined, because "MiClass" is not contextualized within the

callback function.

Anyone know how to do?

Thanks.

Replies(1)

kbwood.au

Re: Callback Context problem

11 years ago

Within the each function, this refers to the current element in the loop. Save a reference to the MiClass instance before entering the loop:

var MiClass = function() {
this.messageAlert = 'Hello';
};
MiClase.prototype.showAlert = function() {
var self = this;
$('.nodes').each(function(index, element) {
alert(self.messageAlert);
});
};

Top Reply

Response title

Attachments

jQuery Forum

Callback Context problem

Replies(1)

Re: Callback Context problem

Statistics

Tags

Actions

Related Posts