延遲加載頁面滾動時的角度視圖和控制器
[英]Lazy loading Angular views and controllers on page scroll
問題描述
我有一個使用Laravel和Angular的微型網站。 這是一個單頁微型網站，響應迅速，分為5個部分。 我想懶得加載它們以減少一次加載。
<body ng-app>
<div id="wrapper">
<section id="intro">1</section>
<section id="Second">2</section>
<section id="Third">3</section>
<section id="Fourth">4</section>
<section id="Fifth">5</section>
</div>
</body>
我正在尋找在頁面加載時加載1和2然后當您向下滾動頁面時加載另一個帶有漂亮淡入的視圖然后加載其交互式項目。
1 個解決方案
解決方案1
12 已采納 2013-12-06 00:51:19
在這種情況下，可能沒有必要（或有效）延遲加載您的控制器，但它可以完成。
這里有很多事情需要解決，所以我將分段處理。
滾動（動畫）上的延遲加載視圖。
標記：
<div class="container">
<section
ng-repeat="section in loadedSections"
ng-include="section+'.html'"
scroll-load
scroll-load-from="sections"
scroll-load-to="loadedSections"
ng-animate="{enter:'section-animate-enter'}"
></section>
</div>
動畫CSS：
.section-animate-enter {
-webkit-transition: 1.5s linear all;
transition: 1.5s linear all;
opacity: 0;
left: 100%;
}
.section-animate-enter.section-animate-enter-active {
opacity: 1;
left: 0;
}
角度邏輯：
app.controller('myCtrl', function($scope) {
$scope.sections = ['top','mid','bottom']; //html files to load (top.html, etc)
$scope.loadedSections = [$scope.sections[0]]; //loaded html files
});
app.directive('scrollLoad', function($compile) {
return {
restrict: 'A',
link: function(scope, element, attrs) {
var to = scope[attrs.scrollLoadTo]; //$scope.loadedSections
var from = scope[attrs.scrollLoadFrom]; //$scope.sections
$window = angular.element(window);
$window.bind('scroll', function(event) {
var scrollTop = document.documentElement.scrollTop || document.body.scrollTop || 0;
var scrollPos = scrollTop + document.documentElement.clientHeight;
var elemBottom = element[0].offsetTop + element.height();
if (scrollPos >= elemBottom) { //scrolled to bottom of scrollLoad element
$window.unbind(event); //this listener is no longer needed.
if (to.length < from.length) { //if there are still elements to load
//use $apply because we're in the window event context
scope.$apply(to.push(from[to.length])); //add next section
}
}
});
}
};
});
延遲加載CONTROLLERS和滾動視圖（動畫）。
標記：
<div class="container">
<!-- the "lazy" directive will get the controller first, then add ng-include -->
<section
ng-repeat="section in loadedSections"
lazy="section"
scroll-load
scroll-load-from="sections"
scroll-load-to="loadedSections"
ng-animate="{enter:'section-animate-enter'}"
></section>
</div>
角度邏輯：
var $appControllerProvider; //see below
var app = angular.module('myApp', []);
app.config(function($controllerProvider) {
$appControllerProvider = $controllerProvider; //cache this so that we can lazy load controllers
});
app.controller('myCtrl', function($scope) {
$scope.sections = ['top','mid','bottom']; //html files to load (top.html, etc)
$scope.loadedSections = [$scope.sections[0]]; //loaded html files
});
app.directive('scrollLoad', function($compile) {
return {
restrict: 'A',
link: function(scope, element, attrs) {
var to = scope[attrs.scrollLoadTo]; //$scope.loadedSections
var from = scope[attrs.scrollLoadFrom]; //$scope.sections
$window = angular.element(window);
$window.bind('scroll', function(event) {
var scrollTop = document.documentElement.scrollTop || document.body.scrollTop || 0;
var scrollPos = scrollTop + document.documentElement.clientHeight;
var elemBottom = element[0].offsetTop + element.height();
if (scrollPos >= elemBottom) { //scrolled to bottom of scrollLoad element
$window.unbind(event); //this listener is no longer needed.
if (to.length < from.length) { //if there are still elements to load
//use $apply because we're in the window event context
scope.$apply(to.push(from[to.length])); //add next section
}
}
});
}
};
});
app.factory('myService', function($http, $q) {
return {
getController: function(fileName) {
return $http.get(fileName+'.js').then(function(response) {
return response.data;
});
}
}
});
app.directive('lazy', function(myService, $compile, $q) {
/* I store the directive in a variable then return it later
* so that I can abstract directive logic into other functions below */
var directiveReturn = {
restrict: 'A',
link: function(scope, element, attrs) {
var loadName = scope.$eval(attrs.lazy);
//this is straightforward - see the "addScript" function for explanation
myService.getController(loadName).then(function(js) {
return addScript(loadName, js, scope);
}).then(function() {
//the controller has been lazy loaded into angular
//now use "ng-include" to lazy load the view.
var ngInc = angular.element('<span></span>')
.attr('ng-include', "'"+loadName+".html'")
.attr('ng-controller', loadName+'Ctrl');
element.append(ngInc);
$compile(ngInc)(scope);
});
} //link
}; //directive return
/*
* This is the magic.
*/
var scriptPromises = {};
function addScript(loadName, js, scope) {
if (!scriptPromises[loadName]) { //if this controller hasn't already been loaded
var deferred = $q.defer();
//cache promise (which caches the controller when resolved)
scriptPromises[loadName] = deferred.promise;
//inject controller into a script tag
var script = document.createElement('script');
script.src = 'data:text/javascript,' + encodeURI(js);
script.onload = function() {
//this is how you lazy load a controller
$appControllerProvider.register(loadName, window[loadName+'Ctrl']);
//now that the controller is registered with angular, resolve the promise
//then, it is safe to add markup that uses this controller with ng-controller
scope.$apply(deferred.resolve());
};
//when this script loads, the controller will be registered and promise is resolved
document.body.appendChild(script);
return deferred.promise;
}
else { //controller already loaded
return scriptPromises[loadName]; //use cached controller
}
}
return directiveReturn;
});
在Angular JS中動態加載視圖/控制器
聲明:本站的技術帖子網頁，遵循CC BY-SA 4.0協議，如果您需要轉載，請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.