我们有一个带侧边的Angular 4网络应用程序。当点击汉堡包图标时,sidenav动画从右向左打开,通过JS给它一个宽度并通过CSS过渡,背景中的主要内容div淡化为不透明的黑色。
问题是侧面开启和关闭时笨重的开场动画,jank。
请记住,我对Angular还是一个相当新的人。代码是:
public openNav() {
let offCanvas = document.getElementById('off-canvas-menu');
let container = document.getElementById('main-wrapper-container');
let openIndex = document.getElementById('main-view-container');
offCanvas.style.width = "250px";
openIndex.style.zIndex = '-1';
setTimeout(function() {container.style.background = "rgba(0,0,0,0.4)"}, 200);
}
public closeNav() {
document.getElementById('off-canvas-menu').style.width = "0";
document.getElementById('main-wrapper-container').style.background = "inherit";
let closeIndex = document.getElementById('main-view-container');
setTimeout(function() { closeIndex.style.zIndex = 'auto'}, 300);
}
我使用zindex设置它的原因是因为其他组件的视图似乎存在问题。如果我删除了zindex,那么透明到黑色的不透明度不会显示在顶部,它会堆叠在主要内容之下。我已经尝试了所有东西来正确堆叠(在不同的div中使用zindex,在CSS中添加定位)但不确定这是Angular的问题,还是我错过了什么,或者上面的代码是不是很糟糕。如果我删除zindex,动画会更顺畅。
此外,这在使用Google Chrome和Safari的Mac上更为明显(在视网膜屏幕上更为流行),在Firefox上工作正常,在Windows上运行正常。
期待任何反馈!
HTML:
<span (click)="openNav()" id="open-off-canvas-menu-button" *ngIf="is_there_session()">
<i class="fa fa-bars" aria-hidden="true"></i>
</span>
<div id="main-wrapper-container" (click)="closeNav()">
<div id="main-view-container">
<router-outlet></router-outlet>
</div>
</div>
SASS:
#open-off-canvas-menu-button{
position: fixed;
top: 0;
right:0;
padding: 25px 18px 0 0;
z-index: 500;
i{
display: inline-block;
color: $gray-forty;
transition: color 500ms ease-in-out;
font-size: 18px;
}
&:hover {
cursor: pointer;
}
}
.off-canvas-menu {
height: 100%;
width: 0;
position: fixed;
top: 0;
right: 0;
background-color: $black;
overflow-x: hidden;
padding-top: 60px;
@include transition(all .5s ease);
z-index: 1000;
}
.off-canvas-menu a {
padding: 8px 8px 8px 32px;
text-decoration: none;
font-size: 1.5rem;
color: $gray-forty;
display: block;
width: 300px;
@include transition(all .5s ease);
&:hover {
cursor: pointer;
}
}
.off-canvas-menu a:hover, .offcanvas a:focus{
color: #f1f1f1;
}
.off-canvas-menu .closebtn {
position: absolute;
top: 5px;
transform: translateX(60%);
font-size: 36px;
}
#main-wrapper-container {
position: relative;
height: 100%;
min-height: 100vh;
width: 100%;
@include transition(all .4s ease);
}
#main-view-container {
position: relative;
}
答案 0 :(得分:0)
相当简单,我只是从增加侧导航的宽度,改为使用ScaleX ......并且jank大幅减少。
.off-canvas-menu {
height: 100%;
transform: scaleX(0);
transform-origin: 100% 50%;
width: 250px;
position: fixed;
top: 0;
right: 0;
background-color: $black;
overflow-x: hidden;
padding-top: 60px;
@include transition(all .5s ease);
z-index: 1000;
}