Dynamic method call in javascript

Question

I'm aware that I could do this:

var myClass = { /* my class definition */ };
var methodName = 'myMethod';
myClass[methodName](p1,p2,...,pN);

But what should I do if have this:

if(data.someMethodName[0]!== undefined){ ... }

or

data.someMethodName[i].someAttribute

How do I call someMethodName dynamically meaning calling it as a string?

Exactly the same way. Which is data[someMethodName]() if I understand you correctly. — Felix Kling
– Felix Kling, Commented Feb 20, 2013 at 16:03

marekful · Accepted Answer · 2018-07-30 10:05:46Z

2

What you are looking for is the bracket notation:

data[someMethodName][0].

data[ someMethodName[0] ](p1, p2, ...)

edited Jul 30, 2018 at 10:05

answered Feb 20, 2013 at 16:03

marekful

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8 Comments

Alan Coromano Over a year ago

data.someMethodName[i].someAttribute how do I call this?

Felix Kling Over a year ago

@Alan: Your example really isn't clear. Please be more specific.

Alan Coromano Over a year ago

data[someMethodName][0] and data[ someMethodName[0] ] are not the same. are you sure it should be so?

Alan Coromano Over a year ago

@FelixKling, I showed 2 examples of what I wanted to know about. What was not clear?

Felix Kling Over a year ago

@Alan: Whether someMethodName is a string or an array. Whether you want to call a method with the name contained in someMethodName[0] or someMethodName. What someAttribute is. Etc. But apart from that, it's always the same. Whenever you have an invalid identifier name or a variable, you have to use bracket notation instead of dot notation.

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