How to access class member from function in method class in typescript

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how to call a function from another class in typescript?

I have this typescript code:

    module MyPage {

    export class MyVm {

        ToDo : string;

        Load() {
            //can access todo here by using this:
            this.ToDo = "test";

            $.get("GetUrl", function (servertodos) {
                //but how do I get to Todo here??
                this.ToDo(servertodos); //WRONG ToDo..
            });
        }
    }
}

The question is, how do I access the todo member field in the $.get callback?

TypeScript also supports arrow function that preserve lexical scoping. Arrow functions result in similar code to Jakub's example but are neater as you don't need to create the variable and adjust usage yourself:

Here is the example using an arrow function:

$.get("GetUrl", (todos) => {
    this.ToDo(todos);
});

Handbook - Classes, Traditional JavaScript uses functions and prototype-based inheritance to This class has three members: a property called greeting , a constructor, and a method greet inheritance feature: classes inherit properties and methods from base classes. In our examples, we've been able to freely access the members that we  Accessing Attributes and Functions. A class’s attributes and functions can be accessed through the object. Use the ‘ . ’ dot notation (called as the period) to access the data members of a class. //accessing an attribute obj.field_name //accessing a function obj.function_name() Example: Putting them together

The same way you do it in javascript

export class MyVm {
    ToDo : string;

    Load() {
        //can access todo here by using this:
        this.ToDo = "test";
        var me = this;

        $.get("GetUrl", function (todos) {
            //but how do I get to Todo here??
            me.ToDo(todos); //WRONG ToDo..
        });
    }
}

Private Methods and Properties in TypeScript Classes, export class Person { // declare our property types firstName: string; lastName: string; private _age: number; // when accessing the age property  Now, TypeScript does not only allows us to define classes but also to control the access to the property of the class that we defined. TypeScript supports the following modifiers: 1. Public: All the properties and methods could be accessed everywhere if they are declared as public. 2.

Fenton is right.

But you can also do this:

 mycallback(todos, self) { self.todo(todos)); }
 $.get('url', mycallback(todos, this));

Advanced TypeScript Concepts: Classes and Types, In TypeScript, the class keyword provides a more familiar syntax for and; A JavaScript variable with a different (anonymous) constructor function type is access modifiers that allow the developer to declare methods and  Move the methods of a class to a superclass or an interface Position the caret anywhere inside the class from which you want to pull the members up. Select Refactor | Pull Members Up from the main menu or from the context menunu. The Pull Members Up dialog opens.

TypeScript Static, The static members of a class are accessed using the class name and dot var Circle = /** @class */ (function () { function Circle() { } Circle.pi = 3.14; return Circle example defines a class with static property and method and how to access it. The syntax should look familiar if you’ve used C# or Java before. We declare a new class Greeter. This class has three members: a property called greeting, a constructor, and a method greet. You’ll notice that in the class when we refer to one of the members of the class we prepend this.. This denotes that it’s a member access.

TypeScript Classes, The class in TypeScript is compiled to plain JavaScript function by the TypeScript In TypeScript, the constructor method is always defined with the name In the constructor, members of the class can be accessed using this keyword e.g. this. An access modifier is a keyword that we can apply to a member of a class to control its access from the outside. In TypeScript we have three keywords for access modifiers: public , private and

All about TypeScript Static Members | TypeScript OOP, Classes contain properties (methods and attributes) which hold variables and operations. Every time we define the properties of a class, they are said to belong to  JavaScript classes also have constructors, properties, and methods similar to most Class-based languages we see today. Unfortunately, in the current version of JavaScript, there is no support for private properties or private methods yet. In JavaScript all class instance properties and methods are public. TypeScript Private Properties

Comments
  • This is one of my favourite things about Typescript.
  • This could be much more clear if data was used in this example too
  • @SerjSagan in the original question, the data parameter was named todos as this is the kind of data that is being supplied by the call. You can use data in place of todos in the above example if you wish. The todos parameter would contain the data object that jQuery passes to the callback.
  • @Sohnee 'this' does not work for me as shown above. Please refer to the question link and correct me if I am doing something wrong. stackoverflow.com/questions/37362178/…
  • Aha.. my lack of javascript skills
  • While this is technically correct, using arrow functions is the better way to do this.
  • This techinque works for other similar scenarios. Was a pointer in the right direction for me.