ScrollTo function in AngularJS

Question

I\'m trying to get a quick nav to work correctly. It\'s floating on the side. When they click on a link, it takes them to that ID on the page. I\'m following this guide fro

Answer 1

very clear answer, using just ANGULARJS, no any JQUERY depends

in your html somewhere on the bottom <back-top>some text</back-top>

in your html somewhere on the top <div id="top"></div>

in your js:

/**
 * @ngdoc directive
 * @name APP.directive:backTop
 <pre>
<back-top></back-top>
 </pre>
 */


angular
.module('APP')
.directive('backTop', ['$location', '$anchorScroll' ,function($location, $anchorScroll) {
  return {
    restrict: 'E',
    replace: true,
    transclude: true,
    template: '<span class=\'btn btn-mute pull-right\'><i class=\'glyphicon glyphicon-chevron-up\'></i><ng-transclude></ng-transclude></span>',
    scope: {
    },
    link: function(scope, element) {
      element.on('click', function(event) {
        $anchorScroll(['top']);
      });
    }
  };
}]);

Answer 2

This is a better directive in case you would like to use it:

you can scroll to any element in the page:

.directive('scrollToItem', function() {                                                      
    return {                                                                                 
        restrict: 'A',                                                                       
        scope: {                                                                             
            scrollTo: "@"                                                                    
        },                                                                                   
        link: function(scope, $elm,attr) {                                                   

            $elm.on('click', function() {                                                    
                $('html,body').animate({scrollTop: $(scope.scrollTo).offset().top }, "slow");
            });                                                                              
        }                                                                                    
    }})     

Usage (for example click on div 'back-to-top' will scroll to id scroll-top):

<a id="top-scroll" name="top"></a>
<div class="back-to-top" scroll-to-item scroll-to="#top-scroll"> 

It's also supported by chrome,firefox,safari and IE cause of the html,body element .

Answer 3

Thanks Andy for the example, this was very helpful. I ended implementing a slightly different strategy since I am developing a single-page scroll and did not want Angular to refresh when using the hashbang URL. I also want to preserve the back/forward action of the browser.

Instead of using the directive and the hash, I am using a $scope.$watch on the $location.search, and obtaining the target from there. This gives a nice clean anchor tag

<a ng-href="#/?scroll=myElement">My element</a>

I chained the watch code to the my module declaration in app.js like so:

.run(function($location, $rootScope) {
   $rootScope.$watch(function() { return $location.search() }, function(search) { 
     var scrollPos = 0;
     if (search.hasOwnProperty('scroll')) {
       var $target = $('#' + search.scroll);
       scrollPos = $target.offset().top;
     }   
     $("body,html").animate({scrollTop: scrollPos}, "slow");
   });
})

The caveat with the code above is that if you access by URL directly from a different route, the DOM may not be loaded in time for jQuery's $target.offset() call. The solution is to nest this code within a $viewContentLoaded watcher. The final code looks something like this:

.run(function($location, $rootScope) {
  $rootScope.$on('$viewContentLoaded', function() {
     $rootScope.$watch(function() { return $location.search() }, function(search) {
       var scrollPos = 0 
       if (search.hasOwnProperty('scroll')) {
         var $target = $('#' + search.scroll);
         var scrollPos = $target.offset().top;
       }
       $("body,html").animate({scrollTop: scrollPos}, "slow");                                                                                                                                                                    
     });  
   });    
 })

Tested with Chrome and FF