Created
December 6, 2010 21:55
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(function() { | |
const NAMESPACE = 'mfp.xrea.jp'; | |
if (!(NAMESPACE in window)) | |
window[NAMESPACE] = {}; | |
if (window[NAMESPACE].Pager !== undefined) | |
return; | |
const Pager = function(namePrefix) { | |
this._namePrefix = namePrefix; | |
this._callbacks = []; | |
this._numbers = []; | |
}; | |
Pager.prototype = { | |
_namePrefix: null, | |
_callbacks: null, | |
addCallback: function(fun) { | |
if (typeof fun !== 'function') | |
return; | |
if (this._callbacks.indexOf(fun) === -1) | |
this._callbacks.push(fun); | |
}, | |
removeCallback: function(fun) { | |
let idx = this._callbacks.indexOf(fun); | |
if (idx !== -1) | |
this._callbacks.splice(idx, 1); | |
}, | |
_callCallbacks: function() { | |
let arg = arguments; | |
this._callbacks.forEach(function(f) f.apply(null, arg)); | |
}, | |
_length: NaN, _current: NaN, | |
_numbers: null, | |
_createLink: function(text, href) { | |
let link = document.createElement('a'); | |
link.href = '#' + href; | |
link.className = this._namePrefix + 'page-link'; | |
link.textContent = text; | |
return link; | |
}, | |
update: function(length) { | |
this._length = length; | |
this.element.textContent = ''; | |
{ | |
let prev = this._createLink('\xab', 'prev'); | |
prev.classList.add(this._namePrefix + 'prev-page'); | |
this.element.appendChild(prev); | |
} | |
this._numbers = []; | |
for (let i = 0; i < length; i++) { | |
let link = this._createLink(i+1, i); | |
this._numbers.push(link); | |
this.element.appendChild(link); | |
} | |
{ | |
let next = this._createLink('\xbb', 'next'); | |
next.classList.add(this._namePrefix + 'next-page'); | |
this.element.appendChild(next); | |
} | |
}, | |
goTo: function(page) { | |
if (page < 0) page = 0; | |
if (page >= this._length) page = this._length - 1; | |
let prefix = this._namePrefix; | |
let length = this._length; | |
this._numbers.forEach(function(e, i) { | |
if (i === page) | |
e.classList.add(prefix + 'current-page'); | |
else | |
e.classList.remove(prefix + 'current-page'); | |
}); | |
this._current = page; | |
}, | |
goNext: function() this.goTo(this._current + 1), | |
goPrev: function() this.goTo(this._current - 1), | |
handleEvent: function(e) { | |
let { type, target } = e; | |
if (type !== 'click' || target.nodeName !== 'A') | |
return; | |
e.preventDefault(); | |
let addr = target.getAttribute('href').slice(1); | |
switch (addr) { | |
case 'prev': this.goPrev(); break; | |
case 'next': this.goNext(); break; | |
default: this.goTo(parseInt(addr, 10)); break; | |
} | |
this._callCallbacks(this._current); | |
}, | |
_element: null, get element() { | |
if (this._element !== null) return this._element; | |
this._element = document.createElement('span'); | |
this._element.addEventListener('click', this, false); | |
return this._element; | |
} | |
}; | |
window[NAMESPACE].Pager = Pager; | |
})(); |
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let pager = new window['mfp.xrea.jp'].Pager('my-pager'); | |
document.body.appendChild(pager.element); | |
pager.update(100); | |
pager.goTo(30); | |
pager.addCallback(function(page) { | |
alert("page: " + page); | |
}); |
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