Dynamically calling a static method in a JavaScript / ES7 class

Question

I have the className in a string variable. I want to call the addField static method on the dynamic class.

const className = "CustomClient"; // comes from dropdown.
CustomClient.addField();

CustomClient is the name of the ES7 class. addField is static method. I want to call the addField dynamically. The class can be one of CustomClient, CustomContract or CustomUser.

do you need to create an instance of the class CustomClient ? — Max Koretskyi
– Max Koretskyi, Commented Oct 29, 2016 at 6:48
do you use modules? if so you probably need to import that class — Max Koretskyi
– Max Koretskyi, Commented Oct 29, 2016 at 6:51

Bergi · Accepted Answer · 2016-10-29 10:33:58Z

2

It's always the same when you want to reference a class by name - whether to instantiate it, to call a static method on it or something else: you have to build a name → class map and look it up:

const classes = {
    "CustomClient": CustomClient,
    …
}
var classRef = classes[className];

In your case, it would be

const classes = {CustomClient, CustomContract, CustomUser}; // shorthand notation
classes[className].addField();

answered Oct 29, 2016 at 10:33

Bergi

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