如何从闭包调用javascript类函数

Question

I'm working on a jQuery plugin that does not have a selector. When initializing it, I instanciate an object that has functions. In these functions, I need to use closures. In these closures, I would like to call my initial object functions.

To make it more clear, here is a simplified version of the code.

HTML

<script src="/path/to/jquery/2.1.1/jquery.min.js"></script>
<script src="/path/to/my/script/myeditor.js"></script>

<div class="editable">Div1</div>
<div class="editable">Div2</div>

<script>
    $.myeditor({
        option1: 'a',
        option2: 'b'
    });
</script>

myeditor.js

function ($) {

var MyEditor = function (options)
{
    this.$options = $.extend(true, {}, $.myeditor.defaults, options);
    this.init();
};

$.myeditor = function (options = {})
{
    return new MyEditor(options);
};

$.flyeditor.defaults = {
    option1: '1',
    option2: '2'
};

MyEditor.prototype.notify = function(message = '')
{
    console.log(message);
};

MyEditor.prototype.init = function()
{
    // Do stuff
    $('.editables').each(function() {
        $this = $(this);

        // Here comes the error
        notify($this.html());
    });
};

}(jQuery);

The problem is that notify(this.html()); raises an error ReferenceError: notify is not defined

How can I reach this notify method?

Answer 1

You can assign this to a separate local variable in a closure. You need to do that because this will no longer point to your MyEditor object inside the each , it will point to each of the .editables

Also, you probably meant to call this.notify() , since the function is attached to the prototype of MyEditor

MyEditor.prototype.init = function()
{
    // Do stuff
    var that = this; // <-- now we can reach this inside function.
    $('.editables').each(function() {
        $this = $(this);

        // Here comes the error
        // You can't use notify, that function is not defined
        // You can't use this.notify because this points to something else (the node)
        // inside the function in each
        that.notify($this.html());
    });
};

Answer 2

MyEditor.prototype.init = function()
{
// Do stuff
var self = this;
$('.editables').each(function() {
    $this = $(this);

    // Here comes the error
    self.notify($this.html());
});
};