如何解决要求使 div 可拖动而不是放置在屏幕外
如果按下左上角的按钮，可以使颜色框不可见。同时，我写下了按钮可以让颜色框随机放置的代码。
我想确保颜色框不会出现在屏幕之外。即使将 body 上的宽度和高度设置为 100%，颜色框也被放置在屏幕外。
而且我想更正颜色框，以便它们可以通过可拖动功能移动，但它们不能一起工作。我也想寻求帮助。
而且我不是编码专家，所以我需要对编码示例进行评论。
<!DOCTYPE html>
<html>
<head>
<Meta charset="UTF-8">
<style type="text/css">
body {margin:0; padding:0;}
button {position: absolute; width: 30px; height: 30px; background: #edd6bc;}
.random {position: absolute; width: 30px; height: 30px;}
</style>
<script>
</script>
</head>
<body >
<button onclick="showhide()" value="Zeige Features" id="button"></button>
<div style="display: none; background: #6d97b4;" class="random" ></div>
<div style="display: none; background: #c9656f;" class="random" ></div>
<div style="display: none; background: #f1eb40;" class="random" ></div>
<div style="display: none; background: #00825c;" class="random" ></div>
<div style="display: none; background: #009ce0;" class="random" ></div>
<div style="display: none; background: #cee4a6;" class="random" ></div>
<script type="text/javascript">
const btn = document.querySelector("button");
const height = document.documentElement.clientHeight;
const width = document.documentElement.clientWidth;
const Boxes = document.querySelectorAll(".random");
btn.addEventListener("click",() => {
Array.from(Boxes).forEach(Box => {
Box.style.top = Math.floor((Math.random() * height) + 1) + "px";
Box.style.right = Math.floor((Math.random() * width) + 1) + "px";
})
});
function showhide() {
var x = document.querySelectorAll(".random");
var i;
for (i = 0; i < x.length; i++) {
if (x[i].style.display === "block") {
x[i].style.display = "none";
} else {
x[i].style.display =
"block";
}
}
}
</script>
</body>
</html>
解决方法
如果你想要一个解释告诉我。
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<style type="text/css">
body {margin:0; padding:0;}
button {position: absolute; width: 30px; height: 30px; background: #edd6bc;}
.random {position: absolute; width: 30px; height: 30px;}
</style>
<script>
</script>
</head>
<body >
<button onclick="showhide()" value="Zeige Features" id="button"></button>
<div style="display: none; background: #6d97b4;" class="random"></div>
<div style="display: none; background: #c9656f;" class="random"></div>
<div style="display: none; background: #f1eb40;" class="random"></div>
<div style="display: none; background: #00825c;" class="random"></div>
<div style="display: none; background: #009ce0;" class="random"></div>
<div style="display: none; background: #cee4a6;" class="random"></div>
<script type="text/javascript">
const btn = document.querySelector("button");
const height = document.documentElement.clientHeight - 30;
const width = document.documentElement.clientWidth - 30;
const boxes = document.querySelectorAll(".random");
btn.addEventListener("click",() => {
Array.from(boxes).forEach(box => {
box.style.top = Math.floor(Math.random() * height) + "px";
box.style.left = Math.floor(Math.random() * width) + "px";
})
});
function showhide() {
var x = document.querySelectorAll(".random");
var i;
for (i = 0; i < x.length; i++) {
if (x[i].style.display === "block") {
x[i].style.display = "none";
} else {
x[i].style.display =
"block";
}
}
}
function mouseDown(downEvent) {
var box = downEvent.srcElement;
var offX = box.getBoundingClientRect().left - downEvent.x;
var offY = box.getBoundingClientRect().top - downEvent.y;
document.onmousemove = e => {
box.style.top = Math.min(Math.max(e.y + offY,0),height) + "px";
box.style.left = Math.min(Math.max(e.x + offX,width) + "px";
}
document.onmouseup = e => {
document.onmousemove = document.onmouseup = null;
}
return false;
}
Array.from(boxes).forEach(box => {
box.onmousedown = mouseDown;
})
</script>
</body>
</html>生成top * right时减去div的高度和宽度
const btn = document.querySelector("button");
const height = document.documentElement.clientHeight;
const width = document.documentElement.clientWidth;
const boxes = document.querySelectorAll(".random");
btn.addEventListener("click",() => {
Array.from(boxes).forEach(box => {
const top = Math.floor(Math.random() * (height - 30) + 1) + "px";
const right = Math.floor(Math.random() * (width - 30) + 1) + "px";
box.style.top = top;
box.style.right = right;
})
});
function showhide() {
var x = document.querySelectorAll(".random");
var i;
for (i = 0; i < x.length; i++) {
if (x[i].style.display === "block") {
x[i].style.display = "none";
} else {
x[i].style.display =
"block";
}
}
}body {
margin: 0;
padding: 0;
}
button {
position: relative;
width: 30px;
height: 30px;
background: #edd6bc;
}
.random {
position: absolute;
width: 30px;
height: 30px;
}<button onclick="showhide()" value="Zeige Features" id="button"></button>
<div style="display: none; background: #6d97b4;" class="random"></div>
<div style="display: none; background: #c9656f;" class="random"></div>
<div style="display: none; background: #f1eb40;" class="random"></div>
<div style="display: none; background: #00825c;" class="random"></div>
<div style="display: none; background: #009ce0;" class="random"></div>
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