我试图通过在某个元素上运行另一个动画时单击一个按钮来使html元素跳转。如果满足条件(在对健康至关重要的情况下闪烁)或单击按钮(在进食时跳转),则在游戏循环中触发动画。
问题:每次循环重复时,动画函数都会再次调用并放入队列中;如果一切正常,闪烁不会停止。仅当它是默认队列(“ fx”)时,才清除动画的回调函数中的队列,但我需要几个自定义队列。
对我来说,使用全局布尔变量来允许或拒绝动画函数被调用并不是解决方案,因为我希望jump()和flash()动画可以被多个html元素使用。
我了解了如何在learn.jquery.com中的元素上排队和启动第二个队列,还阅读了关于动画和排队的jQuery API documentations,但找不到解决方案。
签出flashAnimation1(),这是预期的结果:队列在回调中清除,因此如果触发停止,该元素将停止闪烁。但这仅适用于默认(fx)队列。
letJump1(无队列)和letJump2(自定义队列)使元素在不受控制的情况下上升或缩小。
flashAnimation2()是一个闪烁的烂摊子。
能帮我吗?
let requestAnimationFrame = window.requestAnimationFrame || window.mozRequestAnimationFrame || window.webkitRequestAnimationFrame || windows.msRequestAnimationFrame;
let cancelAnimationFrame = window.cancelAnimationFrame || window.mozCancelAnimationFrame;
let reqAnimF;
let progress = 0;
let lastRender = 0;
let animationOn = false;
const button = document.getElementById("button");
const state = document.getElementById("state");
const jump = document.getElementById("jump");
const block = $("#fadeInAndOut");
const changeStatus = () => animationOn = !animationOn;
const flashAnimation1 = (element) => { $(function() {
element.animate( {opacity: 0}, "fast", "linear" )
.animate( {opacity: 1}, "fast", "linear", ()=> element.clearQueue() );
})
}
const flashAnimation2 = (element) => { $(function() {
element.queue("flash", (next)=> {
element.animate( {opacity: 0}, {
duration: "fast",
easing: "linear",
queue: "flash"
}).animate( {opacity: 1}, {
duration: "fast",
easing: "linear",
queue: "flash",
complete: element.clearQueue()
});
next();
}).dequeue("flash");
});
};
// Jumping: no queue
const letJump1 = (element) => { $(function() {
element.animate( {width: "+=50", height: "+=20"}, {
duration: "fast",
queue: false,
always: () => {
element.animate( {width: "-=50", height: "-=20"}, {
duration: "fast",
queue: false
});
}
}
);
})};
// Jumping queued to another queue
function letJump2(element) {
$(function() {
element.queue("jump", function(next) {
element.animate({width: "+=50", height: "+=20"}, {
duration: "fast",
queue: "jump"
})
.animate( {width: "-=50", height: "-=20"}, {
duration: "fast",
queue: "jump"
});
next();
}).dequeue("jump");
})
};
//////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////
/* function update(progress) {} */
function draw() {
state.innerHTML = animationOn;
if (animationOn) {
flashAnimation2(block);
}
}
function loop(timestamp) {
progress = timestamp - lastRender;
/* update(progress); */
draw();
lastRender = timestamp;
reqAnimF = requestAnimationFrame(loop);
}
button.addEventListener("click", changeStatus);
//jump.addEventListener("click", letJump1(block)); // button is dead for some reason
reqAnimF = requestAnimationFrame(loop);
.center {
position: relative;
margin: auto;
width: 300px;
height: 300px;
text-align: center;
border: 1px solid red;
}
button {
margin: 0 0 20px;
}
#fadeInAndOut {
margin: auto;
width: 100px;
height: 100px;
background-color: black;
}
#jump {
position: absolute;
left: 50%;
bottom: 0;
transform: translateX(-50%);
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="center">
<h1 id="state"></h1>
<button type="button" id="button">Flash on/off</button>
<div id="fadeInAndOut"></div>
<button type="button" id="jump" onclick="letJump1(block)">Jump</button>
</div>