Dynamically loading a typescript class (reflection for typescript)

javascript, typescript

Solution

You could try:

var newInstance = Object.create(window[className].prototype);
newInstance.constructor.apply(newInstance, instanceparameters);
return newInstance;

Edit This version is working using the TypeScript playground, with the example:

class Greeter {
    greeting: string;
    constructor(message: string) {
        this.greeting = message;
    }
    greet() {
        return "Hello, " + this.greeting;
    }
}

//instance creation here
var greeter = Object.create(window["Greeter"].prototype);
greeter.constructor.apply(greeter, new Array("World"));

var button = document.createElement('button');
button.innerText = "Say Hello";
button.onclick = function() {
    alert(greeter.greet());
}

document.body.appendChild(button);

Problem

I would like to be able to instantiate a typescript class where I get the class and constructor details at runtime. The function I would like to write will take in the class name and constructor parameters. ``` export function createInstance(moduleName : string, className : string, instanceParameters : string[]) { //return new [moduleName].[className]([instancePameters]); (THIS IS THE BIT I DON'T KNOW HOW TO DO) } ```

Original source