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Create instance of “Class” Using “Reflection” in JavaScript
Java has Class.forName("XYZClass") to load class at run time. Is there any alternate for Class.forName("XYZClass") in JavaScript?
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Actually I am trying to create object at run time. I have passed a class or function name say 'MyClass' to a function and that function will create object according to that name. – gmuhammad Mar 13 '12 at 08:25
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3It looks like he's trying to load Javascript classes at runtime. But Javasript doesn't have classes... – Mark Byers Mar 13 '12 at 08:25
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And JavaScript is at runtime. – Ates Goral Mar 13 '12 at 08:29
1 Answers
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Personally I think you are trying to literally translate Java code to JavaScript rather than using idiomatic constructs (well, Class.forName() isn't idiomatic in Java as well). However, let's give it a try:
function XYZClass() {
this.answer = 42;
}
This is your class. Normally you would create it using:
var xyz = new XYZClass();
With "reflection" in JavaScript this works:
var className = "XYZClass";
var xyz = new window[className]();
Tomasz Nurkiewicz
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I did not understand your code properly, and I am getting error "TypeError: window[className] is not a constructor". – gmuhammad Mar 13 '12 at 08:35
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1@gmuhammad: and does `new window.XYZClass()` work? Also look at: http://stackoverflow.com/questions/9462881, it has a similar solution. – Tomasz Nurkiewicz Mar 13 '12 at 08:39
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I got your point now, at first try XYZClass was not declared as global. Now I declared it as global and it's working now. And Now I got it why it's working, it's accessing class/function using window which is top level global variable. Thanx. :) – gmuhammad Mar 13 '12 at 08:48