AngularJS custom directive and controller method are attached to md-fab scroll-back-to-top button. The md-fab button is made visible as soon as page is scrolled down and gets hidden when pages reached top. My problem is custom directive not working therefore md-fab button is not made visible on scrolling down. If I change md-button css property visibility to visible and scroll page down then on clicking md-fab button does not respond to scroll back to top of the page.
I started facing this problem since I only reshuffled the same working code in index.html file.
I am unable to trace this problem for a few days. Appreciate some expert guidance to fix this issue telling where I am going wrong.
mainCtrl method
(function() {
angular.module('mainApp')
.controller('mainCtrl', function($scope, $window) {
$scope.scrollTop = function () {
$window.scrollTo(0, 0);
};
}
})();
Custom Directive
(function() {
angular
.module("mainApp")
.directive("scrollToTop", function ($window) {
return {
restrict: 'A',
link: function (scope, element, attrs) {
angular.element($window).bind("scroll", function() {
if (this.pageYOffset > 0) {
element.css({visibility: 'visible'});
} else {
element.css({visibility: 'hidden'});
}
});
}
}
});
})();
HTML
<body layout="row" ng-controller="mainCtrl" ng-cloak>
<md-sidenav>
</md-sidenav>
<main layout="column" flex aria-hidden="false">
<md-toolbar layout-padding class="app-toolbar">
</md-toolbar>
<md-content md-scroll-y flex>
<div ui-view flex="noshrink" ng-hide="data.error">
</div>
<div flex="noshrink" ng-show="data.error">
</div>
<button
type="button"
class="md-fab md-fab-bottom-right md-button md-ink-ripple"
draggable scroll-to-top
ng-click="scrollTop()"
style="position: fixed; visibility: hidden;" aria-label="Back to Top">
<md-tooltip>Draggable Scroll Back to Top</md-tooltip>
<md-icon md-svg-src="img/material/ic_expand_less-24px.svg" aria-hidden="scrollBackToTop button">
</md-icon>
</button>
</md-content>
</main>
</body>`
You do not have the window scrolling because the scrolling is taken care of by md-content of angular material, so please change your code to handle the scroll of md-content instead of the window!
Note: The JS fiddle works, I am adding the snippet for code reference!
angular.module('mainApp', ['ngMaterial']);
angular.module('mainApp')
.controller('mainCtrl', function($scope, $window) {
$scope.scrollTop = function(container) {
console.log(container)
$window.document.querySelector('md-content').scrollTop = 0;
};
});
angular
.module("mainApp")
.directive("scrollToTop", function($window) {
return {
restrict: 'A',
link: function(scope, element, attrs) {
const parent = element.parent();
angular.element(parent).bind("scroll", function(event) {
if (event.target.scrollTop > 0) {
element.css({
visibility: 'visible'
});
} else {
element.css({
visibility: 'hidden'
});
}
});
}
}
});.scroll-to-top {
position: fixed !important;
background-color: red !important;
display: flex !important;
align-items: center;
justify-content: center;
}
.expand-up {
font-size: 40px !important;
color: white;
}<link href="https://ajax.googleapis.com/ajax/libs/angular_material/0.9.0/angular-material.min.css" rel="stylesheet"/>
<body layout="row" ng-app="mainApp" ng-controller="mainCtrl" ng-cloak>
<md-sidenav>
</md-sidenav>
<main layout="column" flex aria-hidden="false">
<md-toolbar layout-padding class="app-toolbar">
</md-toolbar>
<md-content ng-ref="container" md-scroll-y flex>
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<div ui-view flex="noshrink" ng-hide="data.error">
</div>
<div flex="noshrink" ng-show="data.error">
</div>
<button type="button" class="md-fab md-fab-bottom-right md-button md-ink-ripple scroll-to-top" draggable scroll-to-top ng-click="scrollTop(container)" style="position: fixed; visibility: hidden;background-color: red" aria-label="Back to Top">
<i class="material-icons expand-up">expand_less</i>
<!-- <md-tooltip>Draggable Scroll Back to Top</md-tooltip> -->
<!-- <md-icon md-svg-src="img/material/ic_expand_less-24px.svg" aria-hidden="scrollBackToTop button"> -->
</button>
</md-content>
</main>
</body>
<!-- Angular Material Dependencies -->
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.3.15/angular.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.3.15/angular-animate.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.3.15/angular-aria.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/angular_material/0.9.0/angular-material.min.js"></script>
<link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">