binding an event in offline.js

问题

I'm trying to get offline.js working together with toastr alerts.

My limited JS knowledge is holding me back but hoping some can shed some light on this.

What I want to happen When the connection goes from down to up, I want to display a "re-connected successfully" message in a toast alert.

The Problem I don't understand how to check for that status in offline.js. The docs mention that it's possible using this:

Offline.on(event, handler, context) : Bind an event. Events:
up: The connection has gone from down to up
down: The connection has gone from up to down

the up event does what i want but i can't figure out how to put it in to practice...

Below is really just some psuedocode explaining what i'd like to happen:

function checkifbackonline(){
      var backonlinemessage = "re-connected successfully";
      var checkstate = Offline.on(event, handler, context);
      if (checkstate = true) {
        toastr.info(backonlinemessage);
      }
    }
window.setInterval(checkifbackonline, 3000);

Can anyone put me on the right path?

回答1:

you have not attached up event as per the documentation.

function checkifbackonline(evt){
    var backonlinemessage = "re-connected successfully";
    toastr.info(backonlinemessage);
}
Offline.on("up", checkifbackonline);

when up is triggerd it will call checkifbackonline function. If you want to remove the event binding then call Offline.off("up");

来源：https://stackoverflow.com/questions/29411422/binding-an-event-in-offline-js