Access “this” from Java anonymous class
Container.this.select();
this
What is the meaning of “this” in Java?
this refers to the current object. Each non-static method runs in the context of an object. So if you have a class like this: public class MyThisTest { private int a; public MyThisTest() { this(42); // calls the other constructor } public MyThisTest(int a) { this.a = a; // assigns the value of the parameter … Read more
What is context in _.each(list, iterator, [context])?
The context parameter just sets the value of this in the iterator function. var someOtherArray = [“name”,”patrick”,”d”,”w”]; _.each([1, 2, 3], function(num) { // In here, “this” refers to the same Array as “someOtherArray” alert( this[num] ); // num is the value from the array being iterated // so this[num] gets the item at the “num” … Read more
Difference between $(this) and event.target?
There is a difference between $(this) and event.target, and quite a significant one. While this (or event.currentTarget, see below) always refers to the DOM element the listener was attached to, event.target is the actual DOM element that was clicked. Remember that due to event bubbling, if you have <div class=”outer”> <div class=”inner”></div> </div> and attach … Read more
Why is ‘this’ a pointer and not a reference?
When the language was first evolving, in early releases with real users, there were no references, only pointers. References were added when operator overloading was added, as it requires references to work consistently. One of the uses of this is for an object to get a pointer to itself. If it was a reference, we’d … Read more
React: “this” is undefined inside a component function
ES6 React.Component doesn’t auto bind methods to itself. You need to bind them yourself in constructor. Like this: constructor (props){ super(props); this.state = { loopActive: false, shuffleActive: false, }; this.onToggleLoop = this.onToggleLoop.bind(this); }
How can I exclude $(this) from a jQuery selector?
Try using the not() method instead of the :not() selector. $(“.content a”).click(function() { $(“.content a”).not(this).hide(“slow”); });
How do I pass the this context to a function?
Javascripts .call() and .apply() methods allow you to set the context for a function. var myfunc = function(){ alert(this.name); }; var obj_a = { name: “FOO” }; var obj_b = { name: “BAR!!” }; Now you can call: myfunc.call(obj_a); Which would alert FOO. The other way around, passing obj_b would alert BAR!!. The difference between … Read more
When do you use the “this” keyword? [closed]
I don’t mean this to sound snarky, but it doesn’t matter. Seriously. Look at the things that are important: your project, your code, your job, your personal life. None of them are going to have their success rest on whether or not you use the “this” keyword to qualify access to fields. The this keyword … Read more
How does “this” keyword work within a function?
Cannibalized from another post of mine, here’s more than you ever wanted to know about this. Before I start, here’s the most important thing to keep in mind about Javascript, and to repeat to yourself when it doesn’t make sense. Javascript does not have classes (ES6 class is syntactic sugar). If something looks like a … Read more