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110 lines
4.1 KiB
JavaScript
110 lines
4.1 KiB
JavaScript
/*!!
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* Hasher <http://github.com/millermedeiros/hasher>
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* @author Miller Medeiros
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* @version 1.1.2 (2012/10/31 03:19 PM)
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* Released under the MIT License
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*/
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(global => {
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//--------------------------------------------------------------------------------------
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// Private
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//--------------------------------------------------------------------------------------
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var _hash, _bindings = [];
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const
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_hashValRegexp = /#(.*)$/,
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_hashRegexp = /^#/,
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_hashTrim = /^\/|\$/g,
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_trimHash = hash => hash ? hash.replace(_hashTrim, '') : '',
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_getWindowHash = () => {
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//parsed full URL instead of getting window.location.hash because Firefox decode hash value (and all the other browsers don't)
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//also because of IE8 bug with hash query in local file [issue #6]
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var result = _hashValRegexp.exec( location.href );
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return (result && result[1]) ? decodeURIComponent(result[1]) : '';
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},
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_registerChange = newHash => {
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if (_hash !== newHash) {
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var oldHash = _hash;
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_hash = newHash; //should come before event dispatch to make sure user can get proper value inside event handler
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hasher.changed.dispatch(_trimHash(newHash), _trimHash(oldHash));
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}
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},
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_checkHistory = () => {
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var windowHash = _getWindowHash();
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if (windowHash !== _hash) {
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_registerChange(windowHash);
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}
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},
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_setHash = (path, replace) => {
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path = path.join('/');
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path = path ? '/' + path.replace(_hashRegexp, '') : path;
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if (path !== _hash){
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// we should store raw value
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_registerChange(path);
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if (path === _hash) {
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// we check if path is still === _hash to avoid error in
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// case of multiple consecutive redirects [issue #39]
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replace
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? location.replace('#' + encodeURI(path))
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: (location.hash = '#' + encodeURI(path));
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}
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}
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},
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//--------------------------------------------------------------------------------------
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// Public (API)
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//--------------------------------------------------------------------------------------
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hasher = /** @lends hasher */ {
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/**
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* Signal dispatched when hash value changes.
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* - pass current hash as 1st parameter to listeners and previous hash value as 2nd parameter.
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* @type signals.Signal
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*/
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changed : {
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active : true,
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add : callback => _bindings.push(callback),
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dispatch : function(...args) {
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this.active && _bindings.forEach(callback => callback(...args));
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}
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},
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/**
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* Start listening/dispatching changes in the hash/history.
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* <ul>
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* <li>hasher won't dispatch CHANGE events by manually typing a new value or pressing the back/forward buttons before calling this method.</li>
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* </ul>
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*/
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init : () => {
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hasher.init = ()=>{};
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_hash = _getWindowHash();
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//thought about branching/overloading hasher.init() to avoid checking multiple times but
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//don't think worth doing it since it probably won't be called multiple times.
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addEventListener('hashchange', _checkHistory);
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hasher.changed.dispatch(_trimHash(_hash));
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},
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/**
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* Set Hash value, generating a new history record.
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* @param {...string} path Hash value without '#'.
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* @example hasher.setHash('lorem', 'ipsum', 'dolor') -> '#/lorem/ipsum/dolor'
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*/
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setHash : (...path) => _setHash(path),
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/**
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* Set Hash value without keeping previous hash on the history record.
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* Similar to calling `window.location.replace("#/hash")` but will also work on IE6-7.
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* @param {...string} path Hash value without '#'.
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* @example hasher.replaceHash('lorem', 'ipsum', 'dolor') -> '#/lorem/ipsum/dolor'
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*/
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replaceHash : (...path) => _setHash(path, true)
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};
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global.hasher = hasher;
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})(this);
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