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I try to set the navbar li object to active when i currently watch the corresponding section. In other words: When scrolling through my page (single page with multiple sections), the section i'm watching should be highlighted in the navbar.
I already got the scrolling position via directive. Where I fail is to trigger ng-class on the .nav ul li.
<li class="" ng-class="{'active': $parent.scrollPos > document.getElementById('something').offset()}">
<a class="" ng-click="isCollapsed = true" href="#something" du-smooth-scroll>Something</a>
</li>
I doesn't make any difference when I use
ng-class="{'active': $parent.scrollPos > angular.element('#something').offset()}"
How do I get the distance from document-top of any element?
Thanks a lot.
PS: I use jQuery (not lite)!
EDIT How it works (Thanks to @Sharikov Vladislav): On body I use the "PageCtrl":
<body id="page-top" class="index bg-default" ng-app="previewApp" ng-controller="PageCtrl">
which looks like that:
angular.module('previewApp')
.controller('PageCtrl', function($scope, $element) {
$scope.scrollPos = 0;
$scope.getOffset = function (elementId) {
var element = $element.find(elementId);
return element.offset().top;
};
});
Right after the body I use a span
<span scroll-position="scrollPos"></span>
to initialise my "scrollPosition"-directive, which allows me to access the current scroll position over the $scope.scrollPos in PageCtrl. Directive:
angular.module('previewApp')
.directive('scrollPosition', function ($window) {
return {
scope: {
scrollPos: "=scrollPosition"
},
link: function (scope, element, attrs) {
var windowElement = angular.element($window);
var handler = function () {
scope.scrollPos = windowElement.scrollTop();
}
windowElement.on('scroll', scope.$apply.bind(scope, handler));
handler();
}
};
});
In my .nav ul li looks like the following. The "- 150" is for a more acurate highlighting.
<div class="navbar-collapse" uib-collapse="isCollapsed" id="menu-center">
<ul class="nav navbar-nav navbar-right">
<li class="hidden">
<a href="#page-top"></a>
</li>
<li ng-class="{'active': $parent.scrollPos > $parent.getOffset('#section1') - 150 && $parent.scrollPos < $parent.getOffset('#section2') - 150}">
<a ng-click="isCollapsed = true" href="#section1" du-smooth-scroll>Section1</a>
</li>
<li ng-class="{'active': $parent.scrollPos > $parent.getOffset('#section2') - 150 && $parent.scrollPos < $parent.getOffset('#section3')}">
<a ng-click="isCollapsed = true" href="#section2" du-smooth-scroll>Section2</a>
</li>
</ul>
</div>
I hope this helps somebody out there who is struggling over the same problem like me. Greets
I try to set the navbar li object to active when i currently watch the corresponding section. In other words: When scrolling through my page (single page with multiple sections), the section i'm watching should be highlighted in the navbar.
I already got the scrolling position via directive. Where I fail is to trigger ng-class on the .nav ul li.
<li class="" ng-class="{'active': $parent.scrollPos > document.getElementById('something').offset()}">
<a class="" ng-click="isCollapsed = true" href="#something" du-smooth-scroll>Something</a>
</li>
I doesn't make any difference when I use
ng-class="{'active': $parent.scrollPos > angular.element('#something').offset()}"
How do I get the distance from document-top of any element?
Thanks a lot.
PS: I use jQuery (not lite)!
EDIT How it works (Thanks to @Sharikov Vladislav): On body I use the "PageCtrl":
<body id="page-top" class="index bg-default" ng-app="previewApp" ng-controller="PageCtrl">
which looks like that:
angular.module('previewApp')
.controller('PageCtrl', function($scope, $element) {
$scope.scrollPos = 0;
$scope.getOffset = function (elementId) {
var element = $element.find(elementId);
return element.offset().top;
};
});
Right after the body I use a span
<span scroll-position="scrollPos"></span>
to initialise my "scrollPosition"-directive, which allows me to access the current scroll position over the $scope.scrollPos in PageCtrl. Directive:
angular.module('previewApp')
.directive('scrollPosition', function ($window) {
return {
scope: {
scrollPos: "=scrollPosition"
},
link: function (scope, element, attrs) {
var windowElement = angular.element($window);
var handler = function () {
scope.scrollPos = windowElement.scrollTop();
}
windowElement.on('scroll', scope.$apply.bind(scope, handler));
handler();
}
};
});
In my .nav ul li looks like the following. The "- 150" is for a more acurate highlighting.
<div class="navbar-collapse" uib-collapse="isCollapsed" id="menu-center">
<ul class="nav navbar-nav navbar-right">
<li class="hidden">
<a href="#page-top"></a>
</li>
<li ng-class="{'active': $parent.scrollPos > $parent.getOffset('#section1') - 150 && $parent.scrollPos < $parent.getOffset('#section2') - 150}">
<a ng-click="isCollapsed = true" href="#section1" du-smooth-scroll>Section1</a>
</li>
<li ng-class="{'active': $parent.scrollPos > $parent.getOffset('#section2') - 150 && $parent.scrollPos < $parent.getOffset('#section3')}">
<a ng-click="isCollapsed = true" href="#section2" du-smooth-scroll>Section2</a>
</li>
</ul>
</div>
I hope this helps somebody out there who is struggling over the same problem like me. Greets
Share edited Nov 24, 2015 at 9:24 Ore asked Nov 23, 2015 at 17:37 OreOre 1,0322 gold badges14 silver badges25 bronze badges 1- i hope help this link stackoverflow./questions/18953144/… – Mukesh Kumar Bijarniya Commented Nov 23, 2015 at 17:46
3 Answers
Reset to default 8No no no. Wrong! You should not use jQuery, when you are using AngularJS. Inject $element service in your controller:
JavaScript:
myCtrl.$inject = ['$scope', '$element'];
function myCtrl($scope, $element) {
var element = $element.find('#someId');
$scope.getOffset = function () {
return element.offset().top;
};
}
HTML:
<div ng-class='{ "active": getOffset() > xxx }'></div>
You have not to use $(document) or pure jQuery in AngularJS at all.
you could try something like:
$(document).scrollTop() > document.getElementById('something').offset().top
(caveat - I havent' time to test right now - but will later)
I would also suggest saving all your element's Y positions to refer to rather than doing this calculation each time
Use .offset() to get the distance between an element and the top of the document:
angular.element(("li .active").offset().top
本文标签： javascriptAngular get offset of element by idStack Overflow
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