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Every object in amCharts 4 has a property events which is an "event dispatcher".

Event dispatcher is responsible for registering and de-registering custom functions, as well as executing them whenever certain event occurs in the dispatchers parent object.

To register your function to be executed whenever something happens, you use events.on() or events.once().

The difference between the two is that the former will make sure function is called every time an event of that type occurs, while the latter will execute only on the first occurrence.

Both on() and once() take three parameters:

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# Parameter Type Alternate Chargers Powder Jersey Pro Men's Angeles Watt Derek Nfl Line Los Blue Comment
Alternate Chargers Powder Jersey Pro Men's Angeles Watt Derek Nfl Line Los Blue 1 Alternate Chargers Powder Jersey Pro Men's Angeles Watt Derek Nfl Line Los Blue type string  A specific event indicator like "hidden", "propertychanged", etc.
2 callback  function  A callback function that will be called whenever event occurs.
3 scope (optional)  any  A scope in which callback function will be executed.

Here's an example that attaches click event to a column in a Column series:

series.columns.template.events.on("hit", function(ev) {
console.log("clicked on ", ev.target);
}, this);
series.columns.template.events.on("hit", function(ev) {
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console.log("clicked on ", ev.target);
}, this);
{
// ...
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"type": "ColumnSeries",
// ...
"events": {
"hit": function(ev) {
console.log("clicked on ", ev.target);
}
}
}]
}
NOTE

Alternate Chargers Powder Jersey Pro Men's Angeles Watt Derek Nfl Line Los Blue amCharts 4 uses "hit" event to indicated universal click or touch event.

Available events#

For available events for each individual object look up "Events" section in that class' reference.

For example check out Column series events.

The table will show the event identificator (type), e.g. "hit" as well as the precise structure of the event object that will be passed into your custom function whenever event occurs.

Sample class event reference

Removing events#

There are couple of ways to remove existing events.

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To remove specific event, simply use events.off() with the same parameter you used to add event.

Please note, to remove event you need to pass in identical parameters, including the reference to the same callback function, and scope if any.

Alternate Chargers Powder Jersey Pro Men's Angeles Watt Derek Nfl Line Los Blue This means that it won't work for the previous example, since we have used an anonymous function.

If we wanted to add an event for later with an off() function, we'd need to define a function, which we could reference in both calls:

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function myFunction(ev) {
console.log("clicked on ", ev.target);
}
series.columns.template.events.on("hit", myFunction, this);
series.columns.template.events.off("hit", myFunction, this);
function myFunction(ev) {
console.log("clicked on ", ev.target);
}
series.columns.template.events.on("hit", myFunction, this);
series.columns.template.events.off("hit", myFunction, this);

Using disposers#

Whenever an event is created, the on() or off() function returns a so called "disposer" object.

We can assign it to for safekeeping in a variable. Then, when we don't need the event anymore, simply call dispose() method on it. That will remove event handler.

let myEvent = series.columns.template.events.on("hit", function(ev) {
console.log("clicked on ", ev.target);
}, this);
myEvent.dispose();
var myEvent = series.columns.template.events.on("hit", function(evBlack White Jersey Patriots And) {
consoleDesign amp; - Technology Sequence Cre8tive 001.log("clicked on ", ev.target);
}, this);
myEvent.dispose();

Disabling events#

To temporarily disable event handler invocation for certain event type, use event dispatcher's disableType(type) method.

For example, to temporarily disable all event handlers for "hit" event on columns in a series, you'd do this:

series.columns.template.events.disableType("hit");
series.columns.template.events.disableType("hit");

To re-enable, simply call enableType(type).

To disable all event handler activity for the object, use event dispatchers disable() method.

// No event handlers will be called after this
series.columns.template.events.disable();
// No event handlers will be called after this
series.columns.template.events.disable();

As you may already guessed, to enable back event handlers, use enable() method.

"Catch-all" handlers#

It is possible, albeit not recommended, to set up a "catch all" event handlers.

Such handlers will be invoked on all events that occur in target object.

To add such handler, use event dispatcher's onAll() method.

It works exactly like on() with the exception that there's no event type to specify, so we're down to two parameters only:

series.columns.template.events.onAll(function(ev) {
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}, this);
series.columns.template.events.onAll(function(ev) {
Alternate Chargers Powder Jersey Pro Men's Angeles Watt Derek Nfl Line Los Blue console.log("something happened ", ev);
}, thisDuke Basketball Basketball 2018 Duke Jersey);

Manually triggering events#

Sometimes, you maybe need to trigger an event manually. Like for example you might want to trigger a hit event on a "zoom out" button on a chart, when something else happens in your page or application.

For just that case, each and every object, has two methods dispatchImmediately(event_type) and dispatch(event_type).

Both will trigger an event, with the slight difference of that the latter will kick in immediately, while the later will wait for the next frame.

chart.zoomOutButton.dispatchImmediately("hit");
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