jQuery — Callbacks

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jQuery is a popular JavaScript for creating dynamic web pages.

In this article, we’ll look at how to using jQuery in our web apps.

callbacks.disable()

We can call callbacks.disable to disable a callback.

For example, if we have:

const foo = function(value) {
  console.log(`foo: ${value}`);
};
const callbacks = $.Callbacks();
callbacks.add(foo);
callbacks.fire("hello");
callbacks.disable();
callbacks.fire("world");

Then we call callbacks.disable to stop the list of callbacks from being called again.

Therefore, we only see:

foo: hello

logged.

callbacks.disabled()

We can use the callbacks.disabled() method to check if callbacks have been disabled.

For example, we can write:

const foo = function(value) {
  console.log(`foo: ${value}`);
};
const callbacks = $.Callbacks();
callbacks.add(foo);
callbacks.fire("hello");
callbacks.disable();
console.log(callbacks.disabled());
callbacks.fire("world");

Since we called callbacks.disable , callbacks.disabled should log true .

callbacks.empty()