我正在嘗試使用AngularJS重新創建這個小提琴:http://jsfiddle.net/mariusc23/s6mLJ/31/。角度隱藏標題向下滾動,顯示向上滾動
實際上,當用戶向下滾動頁面時,header
消失。如果用戶在任何時候都向上滾動,即使是1/2px ... header
也會下降。
我已經創建了一個plunker:http://plnkr.co/edit/DBiY57kKUWiISVDJiDU4?p=preview這似乎應用hide-header
類,但是,我似乎無法得到出現在scrollUp上。
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>
從未見過{TRUE: '隱藏的頭'}之前 –