Here is a script that needs attention:
Bla = function() {
this.prop = 123;
}
Bla.prototype.yay = function() {
console.log(this,this.prop);
}
X = new Bla();
$(document).ready(X.yay); // output: #document undefined --> why?
$(document).ready(function(){
X.yay(); // output: Bla 123 --> desired result
});
What can be done to ensure that the first call functions correctly (with 'this' referring to X) without extending Object?
Simply put, the context of a function's this keyword depends on whether it is part of an object or not.
When a method is passed into a function, it loses its association with any object and becomes a local variable within that function. In such cases, this typically refers to the document object, as seen in events like document ready.
In modern JavaScript, you have the option to bind a method to a specific object.
For example:
$(document).ready(X.yay.bind(X));
Note that support for this feature may vary across different browsers, so using an anonymous function could be a more compatible alternative, especially for older versions of Internet Explorer.
Utilize the bind function:
$(document).ready(Y.hooray.bind(Y));
By using this method, a "wrapper" is generated around the function that assigns this to Y upon invocation.
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