CODEWITHSUNDEEP
javascriptnode.jsevents
iovoid
iovoid

Reputation: 193

Is there a way to "eat" events in Node.js?

Is there a way to "eat" other listeners of an event?

x.on("test", function(x){
    if(x==4) {
        console.log("Event1");
    }
});
x.on("test", function(x){
    if(x==5) {
        console.log("Event2");
    }
});
x.on("test", function(x){
    console.log("Event3");
});
x.emit("test", 4);
x.emit("test", 5);
x.emit("test", -1);

Is there a way to make event 1 "eat" (not allow it to happen) the other events if x is 4?

Without adding if(x!=4&&x!=5) to event 3 (if there are many listeners it may get annoying quickly).

Bonus: Can I have a "fallback" event to catch events that don't have any listener.

Upvotes: 2

Views: 137

Answers (2)

sanjeev-v
sanjeev-v

Reputation: 28

you can simply try this

    x.on("test", function(x){

        switch(x){
            case 4:         
                console.log("Event1");
                break;
            case 5:
                console.log("Event2");
                break;
            default:
                console.log("Event3");

        }

    });
    x.emit("test", 4);
    x.emit("test", 5);
    x.emit("test", -1);

Upvotes: 0

mscdex
mscdex

Reputation: 106736

The EventEmitter built into node does not support "eating" of other event handlers or having a "catch-all" event handler. If you need that kind of functionality you will have to use one of the other EventEmitter implementations on npm.

Upvotes: 1

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