具有淡入下拉效果的 Angular 和 CSS 动画
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【中文标题】具有淡入下拉效果的 Angular 和 CSS 动画【英文标题】:Angular and CSS animation with fade-in drop down effect 【发布时间】:2021-07-29 05:37:24 【问题描述】:我正在为自己开发一个投资组合网站,但我的 css 动画不断出现这种我不感兴趣的奇怪行为。在我看来,当有人访问我的网站时,标题链接应该如何工作从顶部淡入。一旦它们淡入到位,如果我将鼠标光标悬停在链接上,它应该播放一个脉动到淡入淡出的动画,并且只要鼠标光标在链接上,它就会重复。所有这些都可以正常工作。
当我尝试从顶部动画延迟淡入的初始动画时问题就出现了位置,一秒钟后第二个链接下降并淡入,然后两秒钟后第三个链接下降并淡入。如果我延迟动画,我会失去下拉效果,只有淡入效果播放。
这是所有三个链接都淡入并下降到位的 sn-p。
.myNav
height: 64px;
background-color: #4b5778;
text-align: center;
.navItem
margin: 18px 0px 0px 35px;
display: inline-block;
font-family: Arial, Helvetica, sans-serif;
font-size: 20px;
/* color: white; */
/* color: rgb(182, 181, 181); */
color: greenyellow;
/* transform: scale(1.00);
transition: transform 1s; */
.fade-in-text
animation: fadeIn ease-out 1s;
-webkit-animation: fadeIn ease-out 1s;
-moz-animation: fadeIn ease-out 1s;
-o-animation: fadeIn ease-out 1s;
-ms-animation: fadeIn ease-out 1s;
.navItem:hover
/* transform: scale(1.33);
transition: transform 1s; */
animation: pulsate-in 1.2s ease-out infinite;
/* color: white; */
color: rgb(222, 255, 173);
/* pulsating text animation */
@keyframes pulsate-in
0%
transform: scale(1);
opacity: 1;
50%
opacity: 0.50;
100%
transform: scale(1.25);
opacity: 0;
/* fading text animation */
@keyframes fadeIn
0% opacity: 0; margin: 0px 0px 0px 35px;
100% opacity: 1; margin: 18px 0px 0px 35px;
/* Mozilla */
@-moz-keyframes fadeIn
0% opacity: 0; margin: 0px 0px 0px 35px;
100% opacity: 1; margin: 18px 0px 0px 35px;
/* Safari and Chrome */
@-webkit-keyframes fadeIn
0% opacity: 0; margin: 0px 0px 0px 35px;
100% opacity: 1; margin: 18px 0px 0px 35px;
/* Opera */
@-o-keyframes fadeIn
0% opacity: 0; margin: 0px 0px 0px 35px;
100% opacity: 1; margin: 18px 0px 0px 35px;
<nav class="myNav">
<ul id="menu">
<!-- <li (mouseover)="increment()" class="fade-in-text navItem">Intro</li> -->
<li (click)="scroll(intro)" #intro class="fade-in-text navItem myIntro ">Intro</li>
<li (click)="scroll(projects)" #projects class="fade-in-text navItem myProjects">Projects</li>
<li (click)="scroll(resume)" #resume class="fade-in-text navItem myResume">Resume</li>
</ul>
</nav>
如果我尝试做动画延迟以获得“级联”效果,这是播放动画的 sn-p。
.myNav
height: 64px;
background-color: #4b5778;
text-align: center;
.navItem
margin: 18px 0px 0px 35px;
display: inline-block;
font-family: Arial, Helvetica, sans-serif;
font-size: 20px;
/* color: white; */
/* color: rgb(182, 181, 181); */
color: greenyellow;
/* transform: scale(1.00);
transition: transform 1s; */
.fade-in-text
animation: fadeIn ease-out 1s;
-webkit-animation: fadeIn ease-out 1s;
-moz-animation: fadeIn ease-out 1s;
-o-animation: fadeIn ease-out 1s;
-ms-animation: fadeIn ease-out 1s;
.fade-in-text-two
animation: fadeIn ease-out 1s 2s;
-webkit-animation: fadeIn ease-out 1s 2s;
-moz-animation: fadeIn ease-out 1s;
-o-animation: fadeIn ease-out 1s;
-ms-animation: fadeIn ease-out 1s;
.fade-in-text-three
animation: fadeIn ease-out 1s 3s;
-webkit-animation: fadeIn ease-out 1s 3s;
-moz-animation: fadeIn ease-out 1s;
-o-animation: fadeIn ease-out 1s;
-ms-animation: fadeIn ease-out 1s;
.navItem:hover
/* transform: scale(1.33);
transition: transform 1s; */
animation: pulsate-in 1.2s ease-out infinite;
/* color: white; */
color: rgb(222, 255, 173);
/* pulsating text animation */
@keyframes pulsate-in
0%
transform: scale(1);
opacity: 1;
50%
opacity: 0.50;
100%
transform: scale(1.25);
opacity: 0;
/* fading text animation */
@keyframes fadeIn
0% opacity: 0; margin: 0px 0px 0px 35px;
100% opacity: 1; margin: 18px 0px 0px 35px;
/* Mozilla */
@-moz-keyframes fadeIn
0% opacity: 0; margin: 0px 0px 0px 35px;
100% opacity: 1; margin: 18px 0px 0px 35px;
/* Safari and Chrome */
@-webkit-keyframes fadeIn
0% opacity: 0; margin: 0px 0px 0px 35px;
100% opacity: 1; margin: 18px 0px 0px 35px;
/* Opera */
@-o-keyframes fadeIn
0% opacity: 0; margin: 0px 0px 0px 35px;
100% opacity: 1; margin: 18px 0px 0px 35px;
<nav class="myNav">
<ul id="menu">
<!-- <li (mouseover)="increment()" class="fade-in-text navItem">Intro</li> -->
<li (click)="scroll(intro)" #intro class="fade-in-text navItem myIntro ">Intro</li>
<li (click)="scroll(projects)" #projects class="fade-in-text-two navItem myProjects">Projects</li>
<li (click)="scroll(resume)" #resume class="fade-in-text-three navItem myResume">Resume</li>
</ul>
</nav>
我尝试使用第 n 个类型来单独选择每个列表元素,然后尝试为每个元素分配一个类(如代码所示)。不知道为什么我不断得到这种行为。我在 Angular 上运行它。我最后的手段是在使用 TypeScript 延迟后将类“注入”到每个元素中,但如果可能的话,我宁愿以正确的方式使用 css 完成它。提前致谢!
【问题讨论】:
【参考方案1】:这就是你要找的吗?
为您的项目提供动画值,然后将forwards
添加到您的动画中。
.fade-in-text
opacity: 0;
margin: 0px 0px 0px 35px;
animation: fadeIn ease-out 1s forwards;
然后您可以使用:nth-of-type(n)
来延迟动画。
.fade-in-text:nth-of-type(2)
animation-delay: .2s;
.fade-in-text:nth-of-type(3)
animation-delay: .3s;
.myNav
height: 64px;
background-color: #4b5778;
text-align: center;
.navItem
margin: 18px 0px 0px 35px;
display: inline-block;
font-family: Arial, Helvetica, sans-serif;
font-size: 20px;
/* color: white; */
/* color: rgb(182, 181, 181); */
color: greenyellow;
/* transform: scale(1.00);
transition: transform 1s; */
.fade-in-text
opacity: 0;
margin: 0px 0px 0px 35px;
animation: fadeIn ease-out 1s forwards;
-webkit-animation: fadeIn ease-out 1s forwards;
-moz-animation: fadeIn ease-out 1s forwards;
-o-animation: fadeIn ease-out 1s forwards;
-ms-animation: fadeIn ease-out 1s forwards;
.fade-in-text:nth-of-type(2)
animation-delay: .2s;
.fade-in-text:nth-of-type(3)
animation-delay: .3s;
.navItem:hover
/* transform: scale(1.33);
transition: transform 1s; */
animation: pulsate-in 1.2s ease-out infinite;
/* color: white; */
color: rgb(222, 255, 173);
/* pulsating text animation */
@keyframes pulsate-in
0%
transform: scale(1);
opacity: 1;
50%
opacity: 0.50;
100%
transform: scale(1.25);
opacity: 0;
/* fading text animation */
@keyframes fadeIn
0% opacity: 0; margin: 0px 0px 0px 35px;
100% opacity: 1; margin: 18px 0px 0px 35px;
/* Mozilla */
@-moz-keyframes fadeIn
0% opacity: 0; margin: 0px 0px 0px 35px;
100% opacity: 1; margin: 18px 0px 0px 35px;
/* Safari and Chrome */
@-webkit-keyframes fadeIn
0% opacity: 0; margin: 0px 0px 0px 35px;
100% opacity: 1; margin: 18px 0px 0px 35px;
/* Opera */
@-o-keyframes fadeIn
0% opacity: 0; margin: 0px 0px 0px 35px;
100% opacity: 1; margin: 18px 0px 0px 35px;
<nav class="myNav">
<ul id="menu">
<!-- <li (mouseover)="increment()" class="fade-in-text navItem">Intro</li> -->
<li (click)="scroll(intro)" #intro class="fade-in-text navItem myIntro ">Intro</li>
<li (click)="scroll(projects)" #projects class="fade-in-text navItem myProjects">Projects</li>
<li (click)="scroll(resume)" #resume class="fade-in-text navItem myResume">Resume</li>
</ul>
</nav>
【讨论】:
是的!这就是我一直在努力实现的目标!太感谢了!为什么在这种情况下需要 forwards 属性?我认为这是暗示动画会向前发展。非常感谢您的帮助和指点! 很高兴我能帮上忙!如果没有forwards
,动画将返回原始值。删除它并测试它,看看会发生什么。【参考方案2】:
问题似乎是您正在尝试为边距设置动画,当您增加第一个元素的边距时,它也会影响其他元素并且它们变得可见。
我已经使用position: relative
和top
修复了这个问题,以便它们单独掉落(这样一个元素的属性变化不会影响另一个元素):
.myNav
height: 64px;
background-color: #4b5778;
text-align: center;
.navItem
position: relative;
margin: 18px 0px 0px 35px;
display: inline-block;
font-family: Arial, Helvetica, sans-serif;
font-size: 20px;
/* color: white; */
/* color: rgb(182, 181, 181); */
color: greenyellow;
/* transform: scale(1.00);
transition: transform 1s; */
.fade-in-text
animation: fadeIn ease-out 1s;
.fade-in-text-two
animation: fadeIn ease-out 1.5s;
.fade-in-text-three
animation: fadeIn ease-out 2s;
.navItem:hover
animation: pulsate-in 1.2s ease-out infinite;
color: rgb(222, 255, 173);
/* fading text animation */
@keyframes fadeIn
0%
opacity: 0;
top: -40px;
100%
opacity: 1;
top: 0;
/* pulsating text animation */
@keyframes pulsate-in
0%
transform: scale(1);
opacity: 1;
50%
opacity: 0.50;
100%
transform: scale(1.25);
opacity: 0;
<nav class="myNav">
<ul id="menu">
<!-- <li (mouseover)="increment()" class="fade-in-text navItem">Intro</li> -->
<li (click)="scroll(intro)" #intro class="fade-in-text navItem myIntro ">Intro</li>
<li (click)="scroll(projects)" #projects class="fade-in-text-two navItem myProjects">Projects</li>
<li (click)="scroll(resume)" #resume class="fade-in-text-three navItem myResume">Resume</li>
</ul>
</nav>
【讨论】:
啊好吧我明白了一点。感谢您指出我的问题所在!我被困在这两天尝试不同的选择。正如我伟大的教授曾经说过的那样,“不要在你的代码中扔垃圾,而是要深入沼泽。”以上是关于具有淡入下拉效果的 Angular 和 CSS 动画的主要内容,如果未能解决你的问题,请参考以下文章
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