向下滚动角度隐藏标题,向上滚动显示

时间:2015-10-19 12:58:03

标签: javascript css angularjs angularjs-directive angularjs-scope

我正在尝试使用AngularJS重新创建这个小提琴:http://jsfiddle.net/mariusc23/s6mLJ/31/

实际上,当用户向下滚动页面时,header消失。如果用户在任何时候向上滚动,即使是1 / 2px ...... header也会下降。

我创建了一个plunker:http://plnkr.co/edit/DBiY57kKUWiISVDJiDU4?p=preview似乎应用了hide-header类,但是,我似乎无法在scrollUp上显示。

指令:

app.directive("myDirective", function ($window) {
    return function(scope, element, attrs) {
        angular.element($window).bind("scroll", function() {

            var lastScrollTop = 0;
            var delta = 50;
            var windowInnerHeight = $window.innerHeight;
            var windowHeight = $window.height;

            var st = this.pageYOffset;

            // Make sure they scroll more than delta
            if(Math.abs(lastScrollTop - st) <= delta)
                return;

            // If they scrolled down and are past the navbar, add class .nav-up.
            // This is necessary so you never see what is "behind" the navbar.
            //if (st > lastScrollTop && st > navbarHeight){
            if (st > lastScrollTop && st > 50){
                // Scroll Down
                //$('header').removeClass('nav-down').addClass('nav-up');
                console.log("in if...");
                scope.navUp = true;
            } else {
                // Scroll Up
                if(st + windowInnerHeight < windowHeight) {
                    //$('header').removeClass('nav-up').addClass('nav-down');
                    console.log("in else...");
                }
            }

            lastScrollTop = st;

            scope.$apply();
        });
    };
});

HTML:

<body ng-controller="MainCtrl">
    <header my-directive ng-class="{true : 'hide-header'}[navUp]">
      <ul>
        <li>Item 1</li>
        <li>Item 2</li>
        <li>Item 3</li>
        <li>Item 4</li>
      </ul>
    </header>
  </body>

1 个答案:

答案 0 :(得分:1)

您可以使用headroom.js向下滚动隐藏标题。使用AngularJS可以轻松实现该脚本。

包括headroom.jsangular.headroom.js,并要求AngularJS应用程序模块中的余量模块。

javascript angular.module('app', [ // your requires 'headroom' ]);

然后在标记中使用该指令:

html
<header headroom></header>
<!-- or -->
<headroom></headroom>
<!-- or with options -->
<headroom tolerance='0' offset='0' scroller=".my-scroller" classes="{pinned:'headroom--pinned',unpinned:'headroom--unpinned',initial:'headroom'}"></headroom>