Retrieve class name from within static method in typescript

Question

I am trying to retrieve the class name from within a static method. It works from an ordinary method but not from within a static method

 class MyNode{
    constructor(){
        var classname=this.constructor.toString().split ('(' || /s+/)[0].split (' ' || /s+/)[1];
        console.log(classname);
    }
    static a_static_method(){
        var classname=this.constructor.toString().split ('(' || /s+/)[0].split (' ' || /s+/)[1];
        console.log(classname);
    }
}
var obj=new MyNode(); // THIS WORKS, prints "MyNode" 
MyNode.a_static_method(); // THIS DOESN'T, prints "Function"

I forgot to tell: it should work for the derived classes of MyNode.

FYI: in the non static method, you can use this.constructor.name instead of that long regexp — Nicu Surdu
– Nicu Surdu, Commented Aug 7, 2017 at 16:06

aperpen · Accepted Answer · 2018-02-28 20:56:53Z

30

Now you can just use this.name

answered Feb 28, 2018 at 20:56

aperpen

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2 Comments

NobleUplift Over a year ago

It feels so strange referencing this from a static context, but it works.

Charaf Over a year ago

The official TS 1.8 documentation states (8.2.1): "Within static member functions and static member accessors, the type of this is the constructor function type."

lukbl · Accepted Answer · 2016-04-05 13:14:12Z

7

Please check following solution:

class MyNode{
    constructor(){
        var classname=this.constructor.toString().split ('(' || /s+/)[0].split (' ' || /s+/)[1];
        console.log(classname);
    }
    static a_static_method(){
        var classname = this.toString().split ('(' || /s+/)[0].split (' ' || /s+/)[1];
        console.log(classname);
    }
}

In derived class you will get the name of that class, not MyNode

answered Apr 5, 2016 at 13:14

lukbl

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1 Comment

SlothFriend Over a year ago

This answer is quite old, please see the answer below. You can use this.name now, apparently.

Tomaz Smid · Accepted Answer · 2017-06-09 14:38:39Z

Previous answers will fail in certain cases

class cl_s2{
	constructor(){
    }

static a_static_method(){
        var classname = this.toString().split ('(' || /s+/)[0].split (' ' || /s+/)[1];
        console.log(classname);
    }

static get is() {
    return this.toString().replace(new
    RegExp('^class(?: |\n|\r)+([^\s\n\r{]+)[\s\n\r{](?:\s|\n|\r|.)+', 'i'), '$1').trim();
  }

static get className() {
        let classNameRegEx = /(?:\S+\s+){1}([a-zA-Z_$][0-9a-zA-Z_$]*)/;
        return classNameRegEx.exec( this.toString() )[1];
    }
}

//Will fail in chrome because toString will return " class cl_s2{ ...", so there will be no "("
cl_s2.a_static_method();

//Will fail in browser which will display "function cl_s2(){" instead
// and in classes with underscore in name
console.log(cl_s2.is);

//this will work as long as you do not use unicode chars in classnames
console.log(cl_s2.className);

Denis TRUFFAUT · Accepted Answer · 2017-03-27 23:32:10Z

0

Improved method.

How to get class name in a static method

Useful for polymer 2.0 elements

The following code :

class G {
  static get is() {
    return this.toString().replace(new
    RegExp('^class(?: |\n|\r)+([^\s\n\r{]+)[\s\n\r{](?:\s|\n|\r|.)+', 'i'), '$1').trim();
  }
}; 

G.is

Gives you :

"G"

edited Mar 27, 2017 at 23:32

answered Mar 27, 2017 at 23:19

Denis TRUFFAUT

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