Eventr

实现得太烂, 不推荐使用

install

npm install eventr

quick example

var Eventr = require('eventr');
var et = new Eventr();
et.emit('google', '!!!');
et.emit('bing', '???');
et.on(['google', 'bing'], function (edata) {
  console.log(edata.google); // => !!!
  console.log(edata.bing); // => ???
});

usage

• normal usage
• event array
• chain multi listeners
• map array to another
• #emitNow
• #done and #err
• methods delegate to async.js

normal usage

et.on(eventName, function (edata) {})

it('should work with one event', function (done) {
  var et = new Eventr();
  et.emit('hello', 'ok');
  // edata is what you emit
  et.on('hello', function (edata) {
    edata.should.equal('ok');
    done();
  });
});

event array

et.on([eventName1, eventName2, ..], function (edata) {}

it('should work with event array', function (done) {
  var et = new Eventr();
  fetchurl('google', function (err, content) {
    et.emit('page1', content);
  });
  fetchurl('yahoo', function (err, content) {
    et.emit('page2', content);
  });
  // edata is a hash
  et.on(['page1', 'page2'], function (edata) {
    edata.page1.should.equal('pagecontentgoogle');
    edata.page2.should.equal('pagecontentyahoo');
    done();
  });
});

chain multi listeners

it('should work in order', function (done) {
  var et = new Eventr();

  fetchurl('file1', function (err, content) {
    et.emit('file1', content);
  });
  fetchurl('file2', function (err, content) {
    et.emit('file2', content);
  });

  et.on(['file1', 'file2'], function (edata) {
    fetchurl('file3', et.done(function (content) {
      edata.file3 = content;
      et.emit('allfile', edata);
    }));
  });

  et.on('allfile', function (edata) {
    // concat file1 and file2 and file3
    var content = edata.file1 + edata.file2 + edata.file3;
    content.should.equal('pagecontentfile1pagecontentfile2pagecontentfile3');
    done();
  });
});

map array to another

• on(eventName, total, function (dataArr) {})
• emit(eventName, data, index)
• done(eventName, index)

it('should ensure `emit` order', function (done) {
  var et = new Eventr();
  et.on('doc', 5, function (docs) {
    docs.should.eql([1, 4, 9, 16, 25]);
    done();
  });

  var datas = [1, 2, 3, 4, 5];
  datas.forEach(function (d, idx) {
    setTimeout(function () {
      et.emit('doc', d * d, idx);
    }, 5 - d);
  });
});

#emit and #emitNow

et.emit('google', 'Im feeling lucky')
et.emitNow('google', 'Im feeling lucky')

when you call et.emit('sth', data), the sth event would trigger in process.nextTick. If you want it emit as soon as possible, call et.emitNow('sth', data).

#done and #err

#done would handle callback err for you.

#done has three forms. each form return a function (err, data).

et.done(eventName) // handle err, and auto `emit(eventName, data)`
et.done(eventName, thenFn) // handle err, and auto `emit(eventName, thenFn(data))`
et.done(callback) // only handle err, you should emit manually. `callback(data)` only receive data.

#err has two form.

et.err(errHandler) // errHandler is a function, et.done would use it.
et.err(err) // err is a JS Error. et use errHandler to handle it

it('should work with event array', function (done) {
  var et = new Eventr();
  et.err(done);
  fetchurl('google', et.done('page1'));
  fetchurl('yahoo', et.done('page2'));
  et.on(['page1', 'page2'], function (edata) {
    edata.page1.should.equal('pagecontentgoogle');
    edata.page2.should.equal('pagecontentyahoo');
    done();
  });
});

TODO

• [ ] browser UMD support