angular-state-loadable
Version:
A lazy loading scheme
243 lines (189 loc) • 17.9 kB
JavaScript
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;
/* global angular:false */
// CommonJS
if (typeof module !== "undefined" && typeof exports !== "undefined" && module.exports === exports){
module.exports = 'angular-state-loadable';
}
// Assume polyfill used in StateRouter exists
// Instantiate module
angular.module('angular-state-loadable', ['angular-state-router'])
.factory('$loadableManager', require('./services/loadable-manager'))
.run(['$loadableManager', function($loadableManager) {
$loadableManager.$ready();
}]);
},{"./services/loadable-manager":2}],2:[function(require,module,exports){
;
/* global document:false */
module.exports = ['$state', '$q', '$rootScope', function($state, $q, $rootScope) {
// DOM target
var _head;
// Instance
var _self = {};
// Library
var _loadableHash = {};
// Progress
var _loadingList = [];
var _completedList = [];
/**
* A loaded resource, adds self to DOM, self manage progress
*
* @return {_Loadable} An instance
*/
var _Loadable = function(src) {
var _deferred = $q.defer();
// Instance
var _loadable = {
src: src,
// Loading completion flag
isComplete: false,
promise: _deferred.promise,
// TODO switch to $document
$element: document.createElement('script')
};
// Build DOM element
_loadable.$element.src = src;
_loadable.$element.type = 'text/javascript';
_loadable.$element.async = false;
_head.insertBefore(_loadable.$element, _head.firstChild);
// Mark loading in progress
_loadingList.push(_loadable);
// Completion
_loadable.$element.onload = _loadable.$element.onreadystatechange = function() {
if(!_loadable.isComplete && (!this.readyState || this.readyState === "loaded" || this.readyState === "complete")) {
_loadable.isComplete = true;
_loadable.$element.onload = _loadable.$element.onreadystatechange = null;
if(_head && _loadable.$element.parentNode) {
_head.removeChild(_loadable.$element);
}
// Mark complete
var i = _loadingList.indexOf(_loadable);
if(i !== -1) {
_loadingList.splice(i, 1);
}
_completedList.push(_loadable);
_deferred.resolve(_loadable);
}
};
return _loadable;
};
/**
* Get progress
*
* @return {Number} A number 0..1 denoting progress
*/
var _getProgress = function() {
var loaded = _loadingList.length;
var total = _loadingList.length + _completedList.length;
return Math.min(1, Math.max(0, loaded/total));
};
/**
* Create a _Loadable. Does not replace previously created instances.
*
* @param {String} src A source path for script asset
* @return {_Loadable} A loadable instance
*/
var _createLoadable = function(src) {
var loadable;
// Valid state name required
if(!src || src === '') {
var error;
error = new Error('Loadable requires a valid source.');
error.code = 'invalidname';
throw error;
}
// Already exists
if(_loadableHash[src]) {
loadable = _loadableHash[src];
// Create new
} else {
// Create new instance
loadable = new _Loadable(src);
_loadableHash[src] = loadable;
// Broadcast creation, progress
$rootScope.$broadcast('$loadableCreated', loadable);
$rootScope.$broadcast('$loadableProgress', _getProgress());
// Completion
loadable.promise.then(function() {
// Broadcast complete
$rootScope.$broadcast('$loadableProgress', _getProgress());
if(_loadingList.length === 0) {
$rootScope.$broadcast('$loadableComplete', loadable);
}
});
}
return loadable;
};
/**
* Load all required items
*
* @return {Promise} A promise fulfilled when the resources are loaded
*/
var _load = function() {
var deferred = $q.defer();
var current = $state.current();
// Evaluate
if(current) {
var sources = (typeof current.load === 'string' ? [current.load] : current.load) || [];
// Get promises
$q.all(sources
.map(function(src) {
return _createLoadable(src);
})
.filter(function(loadable) {
return !loadable.isComplete;
})
.map(function(loadable) {
return loadable.promise;
})
)
.then(function() {
deferred.resolve();
}, function(err) {
$rootScope.$broadcast('$loadableError', err);
deferred.reject(err);
});
// No state
} else {
deferred.resolve();
}
return deferred.promise;
};
_self.$load = _load;
/**
* Create a loadable, get reference to existing methods
*
* @param {String} src A source path for script asset
* @return {Promise} A promise fulfilled when the resource is loaded
*/
_self.get = function(src) {
return _createLoadable(src).promise;
};
/**
* Get progress
*
* @return {Number} A number 0..1 denoting current progress
*/
_self.progress = _getProgress;
/**
* Ready
*/
_self.$ready = function() {
_head = angular.element(document.querySelector('head'))[0];
// Register middleware layer
$state.$use(function(request, next) {
next();
// Load after state change is finished to avoid collision
request.promise.then(function() {
_load();
});
}, 1);
// Refresh after all loadables are done
$rootScope.$on('$loadableComplete', function() {
$state.reload();
});
};
return _self;
}];
},{}]},{},[1])
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e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require==\"function\"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error(\"Cannot find module '\"+o+\"'\");throw f.code=\"MODULE_NOT_FOUND\",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require==\"function\"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})","'use strict';\n\n/* global angular:false */\n\n// CommonJS\nif (typeof module !== \"undefined\" && typeof exports !== \"undefined\" && module.exports === exports){\n  module.exports = 'angular-state-loadable';\n}\n\n// Assume polyfill used in StateRouter exists\n\n// Instantiate module\nangular.module('angular-state-loadable', ['angular-state-router'])\n\n  .factory('$loadableManager', require('./services/loadable-manager'))\n\n  .run(['$loadableManager', function($loadableManager) {\n    $loadableManager.$ready();\n  }]);\n","'use strict';\n\n/* global document:false */\n\nmodule.exports = ['$state', '$q', '$rootScope', function($state, $q, $rootScope) {\n\n  // DOM target\n  var _head;\n\n  // Instance\n  var _self = {};\n\n  // Library\n  var _loadableHash = {};\n\n  // Progress\n  var _loadingList = [];\n  var _completedList = [];\n\n  /**\n   * A loaded resource, adds self to DOM, self manage progress\n   * \n   * @return {_Loadable} An instance\n   */\n  var _Loadable = function(src) {\n    var _deferred = $q.defer();\n\n    // Instance\n    var _loadable = {\n\n      src: src,\n\n      // Loading completion flag\n      isComplete: false,\n\n      promise: _deferred.promise,\n\n      // TODO switch to $document\n      $element: document.createElement('script')\n    };\n\n    // Build DOM element\n    _loadable.$element.src = src;\n    _loadable.$element.type = 'text/javascript';\n    _loadable.$element.async = false;\n\n    _head.insertBefore(_loadable.$element, _head.firstChild);\n\n    // Mark loading in progress\n    _loadingList.push(_loadable);\n\n    // Completion\n    _loadable.$element.onload = _loadable.$element.onreadystatechange = function() {\n\n      if(!_loadable.isComplete && (!this.readyState || this.readyState === \"loaded\" || this.readyState === \"complete\")) {\n        _loadable.isComplete = true;\n        _loadable.$element.onload = _loadable.$element.onreadystatechange = null;\n        \n        if(_head && _loadable.$element.parentNode) {\n          _head.removeChild(_loadable.$element);\n        }\n\n        // Mark complete\n        var i = _loadingList.indexOf(_loadable);\n        if(i !== -1) {\n          _loadingList.splice(i, 1);\n        }\n        _completedList.push(_loadable);\n\n        _deferred.resolve(_loadable);\n      }\n    };\n\n    return _loadable;\n  };\n\n  /**\n   * Get progress\n   * \n   * @return {Number} A number 0..1 denoting progress\n   */\n  var _getProgress = function() {\n    var loaded = _loadingList.length;\n    var total = _loadingList.length + _completedList.length;\n    return Math.min(1, Math.max(0, loaded/total));\n  };\n\n  /**\n   * Create a _Loadable.  Does not replace previously created instances.  \n   * \n   * @param  {String}    src A source path for script asset\n   * @return {_Loadable}     A loadable instance\n   */\n  var _createLoadable = function(src) {\n    var loadable;\n\n    // Valid state name required\n    if(!src || src === '') {\n      var error;\n      error = new Error('Loadable requires a valid source.');\n      error.code = 'invalidname';\n      throw error;\n    }\n\n    // Already exists\n    if(_loadableHash[src]) {\n      loadable = _loadableHash[src];\n\n    // Create new\n    } else {\n      // Create new instance\n      loadable = new _Loadable(src);\n      _loadableHash[src] = loadable;\n\n      // Broadcast creation, progress\n      $rootScope.$broadcast('$loadableCreated', loadable);\n      $rootScope.$broadcast('$loadableProgress', _getProgress());\n\n      // Completion\n      loadable.promise.then(function() {\n\n        // Broadcast complete\n        $rootScope.$broadcast('$loadableProgress', _getProgress());\n        if(_loadingList.length === 0) {\n          $rootScope.$broadcast('$loadableComplete', loadable);\n        }\n      });\n    }\n\n    return loadable;\n  };\n\n  /**\n   * Load all required items\n   * \n   * @return {Promise} A promise fulfilled when the resources are loaded\n   */\n  var _load = function() {\n    var deferred = $q.defer();\n\n    var current = $state.current();\n\n    // Evaluate\n    if(current) {\n      var sources = (typeof current.load === 'string' ? [current.load] : current.load) || [];\n      \n      // Get promises\n      $q.all(sources\n        .map(function(src) {\n          return _createLoadable(src);\n        })\n        .filter(function(loadable) {\n          return !loadable.isComplete;\n        })\n        .map(function(loadable) {\n          return loadable.promise;\n        })\n      )\n          .then(function() {\n            deferred.resolve();\n\n          }, function(err) {\n            $rootScope.$broadcast('$loadableError', err);\n            deferred.reject(err);\n          });\n\n    // No state\n    } else {\n      deferred.resolve();\n    }\n\n    return deferred.promise;\n  };\n  _self.$load = _load;\n\n  /**\n   * Create a loadable, get reference to existing methods\n   * \n   * @param  {String}    src A source path for script asset\n   * @return {Promise}       A promise fulfilled when the resource is loaded\n   */\n  _self.get = function(src) {\n    return _createLoadable(src).promise;\n  };\n\n  /**\n   * Get progress\n   * \n   * @return {Number} A number 0..1 denoting current progress\n   */\n  _self.progress = _getProgress;\n\n  /**\n   * Ready\n   */\n  _self.$ready = function() {\n    _head = angular.element(document.querySelector('head'))[0];\n\n    // Register middleware layer\n    $state.$use(function(request, next) {\n      next();\n\n      // Load after state change is finished to avoid collision\n      request.promise.then(function() {\n        _load();\n      });\n\n    }, 1);\n\n    // Refresh after all loadables are done\n    $rootScope.$on('$loadableComplete', function() {\n      $state.reload();\n    });\n  };\n\n  return _self;\n}];\n"]}