javascript - 了解鼠标是否在元素上的替代方法(Javascript)
问题描述
我有一个脚本,当我的鼠标悬停在它上面时,它会显示一个“悬停元素”(如缩放)。我知道这有点乱,但这里有一个例子:
function showOverflow2(e) {
let cell = e.currentTarget;
let clone = cell.cloneNode(true);
if (cell.children[0].scrollWidth <= cell.children[0].clientWidth) {
return false;
};
clone.innerHTML = clone.children[0].innerHTML;
clone.style.position = 'absolute';
clone.style.backgroundColor = 'white';
clone.style.borderWidth = '2px';
clone.style.lineHeight = cell.scrollHeight + 'px';
clone.style.whiteSpace = 'nowrap';
x0 = (
cell.offsetLeft +
parseFloat(
getComputedStyle(
cell.parentElement.parentElement.parentElement.parentElement
)["padding-left"].slice(0, -2)
) + 2
);
y0 = (
cell.offsetTop +
parseFloat(
getComputedStyle(
cell.parentElement.parentElement.parentElement.parentElement
)["padding-top"].slice(0, -2)
) + 2
);
xmid = x0 + (cell.clientWidth / 2);
ymid = y0 + (cell.clientHeight / 2);
let body = document.getElementsByTagName('body')[0];
body.appendChild(clone);
clone.style.height = cell.scrollHeight + 'px';
clone.style.width = clone.scrollWidth + 'px';
xf = xmid - (clone.clientWidth / 2);
yf = ymid - (clone.clientHeight / 2);
clone.style.top = yf + 'px';
clone.style.left = xf + 'px';
// FOCUS ON THIS PART
clone.addEventListener("mouseout", function() {
clone.remove();
});
// END OF FOCUS
};
let all_cells = document.getElementsByTagName('td');
for (let i = 0; i < all_cells.length; i++) {
let current_cell = all_cells[i];
if (current_cell.className !== 'buttons') {
current_cell.addEventListener("mouseover", showOverflow2);
}
}
body {
margin: 0;
}
#container {
background-color: gainsboro;
border: 2px solid black;
border-radius: 2px;
padding: 1.2%;
max-width: 50%;
}
table {
border-collapse: separate;
border-spacing: 0 0.5rem;
table-layout: fixed;
width: 100%;
}
tr {
background-color: white;
}
td {
width: calc(100%/3);
border: solid gray;
border-width: 2px 1px 2px 0;
padding: 0.7% 1%;
text-align: center;
white-space: nowrap;
}
span {
display: block;
overflow: hidden;
}
td:first-child {
border-left-width: 2px;
border-radius: 3px 0 0 3px;
}
td:last-child {
border-right-width: 2px;
border-radius: 0 3px 3px 0;
}
<div id="container">
<table id="table">
<tr>
<td class="cell1"><span>AAAAAAAAABBBCC</span></td>
<td class="cell2"><span>AAAAAAAAAABBBB</span></td>
<td class="cell3"><span>AAAAAAAAAAAAABBBBB</span></td>
</td>
</tr>
</table>
</div>
要删除“缩放”并使事情恢复正常,我只是使用:
clone.addEventListener("mouseout", function() {
clone.remove();
如果您将鼠标平稳地移动到元素上,这很好用,但是使用更大的表格和更快的移动,您可以自己看到某些元素没有恢复正常:
function showOverflow2(e) {
let cell = e.currentTarget;
let clone = cell.cloneNode(true);
if (cell.children[0].scrollWidth <= cell.children[0].clientWidth) {
return false;
};
clone.innerHTML = clone.children[0].innerHTML;
clone.style.position = 'absolute';
clone.style.backgroundColor = 'white';
clone.style.borderWidth = '2px';
clone.style.lineHeight = cell.scrollHeight + 'px';
clone.style.whiteSpace = 'nowrap';
x0 = (
cell.offsetLeft +
parseFloat(
getComputedStyle(
cell.parentElement.parentElement.parentElement.parentElement
)["padding-left"].slice(0, -2)
) + 2
);
y0 = (
cell.offsetTop +
parseFloat(
getComputedStyle(
cell.parentElement.parentElement.parentElement.parentElement
)["padding-top"].slice(0, -2)
) + 2
);
xmid = x0 + (cell.clientWidth / 2);
ymid = y0 + (cell.clientHeight / 2);
let body = document.getElementsByTagName('body')[0];
body.appendChild(clone);
clone.style.height = cell.scrollHeight + 'px';
clone.style.width = clone.scrollWidth + 'px';
xf = xmid - (clone.clientWidth / 2);
yf = ymid - (clone.clientHeight / 2);
clone.style.top = yf + 'px';
clone.style.left = xf + 'px';
// FOCUS ON THIS PART
clone.addEventListener("mouseout", function() {
clone.remove();
});
// END OF FOCUS
};
let all_cells = document.getElementsByTagName('td');
for (let i = 0; i < all_cells.length; i++) {
let current_cell = all_cells[i];
if (current_cell.className !== 'buttons') {
current_cell.addEventListener("mouseover", showOverflow2);
}
}
body {
margin: 0;
}
#container {
background-color: gainsboro;
border: 2px solid black;
border-radius: 2px;
padding: 1.2%;
max-width: 50%;
}
table {
border-collapse: separate;
border-spacing: 0 0.5rem;
table-layout: fixed;
width: 100%;
}
tr {
background-color: white;
}
td {
width: calc(100%/3);
border: solid gray;
border-width: 2px 1px 2px 0;
padding: 0.7% 1%;
text-align: center;
white-space: nowrap;
}
span {
display: block;
overflow: hidden;
}
td:first-child {
border-left-width: 2px;
border-radius: 3px 0 0 3px;
}
td:last-child {
border-right-width: 2px;
border-radius: 0 3px 3px 0;
}
<div id="container">
<table id="table">
<tr>
<td class="cell1"><span>AAAAAAAAABBBCC</span></td>
<td class="cell2"><span>AAAAAAAAABBBB</span></td>
<td class="cell3"><span>AAAAAAAAAAAABBBBB</span></td>
</td>
</tr>
<tr>
<td class="cell1"><span>AAAAAAAABBBCC</span></td>
<td class="cell2"><span>AAAAAAAAABBBB</span></td>
<td class="cell3"><span>AAAAAAAAAAAAABBBBB</span></td>
</td>
</tr>
<tr>
<td class="cell1"><span>AAAAAAAAABBBCC</span></td>
<td class="cell2"><span>AAAAAAAAAAABBBB</span></td>
<td class="cell3"><span>AAAAAAAAAAAAABBBBB</span></td>
</td>
</tr>
<tr>
<td class="cell1"><span>AAAAAAAAABBBCC</span></td>
<td class="cell2"><span>AAAAAAAAAABBBB</span></td>
<td class="cell3"><span>AAAAAAAAAAAAABBBBB</span></td>
</td>
</tr>
<tr>
<td class="cell1"><span>AAAAAAAAABBBCC</span></td>
<td class="cell2"><span>AAAAAAAAAAABBBB</span></td>
<td class="cell3"><span>AAAAAAAAAAAAAABBBBB</span></td>
</td>
</tr>
<tr>
<td class="cell1"><span>AAAAAAAAAABBBCC</span></td>
<td class="cell2"><span>AAAAAAAAAAaAABBBB</span></td>
<td class="cell3"><span>AAAAAAAAAAAAAAAABBBBB</span></td>
</td>
</tr>
<tr>
<td class="cell1"><span>AAAAAAAABBBCC</span></td>
<td class="cell2"><span>AAAAAAASAABBBB</span></td>
<td class="cell3"><span>AAAAAAAAAAAAAAABBBBB</span></td>
</td>
</tr>
<tr>
<td class="cell1"><span>AAAAAAAAAABBBCC</span></td>
<td class="cell2"><span>AAAAAAAAAABBBB</span></td>
<td class="cell3"><span>AAAAAAAAAAAAABBBBB</span></td>
</td>
</tr>
</table>
</div>
如果我不能相信这个mouseout
事件,我能做些什么来解决这个问题?
我考虑过在鼠标移动时使用 eventListener 来测试鼠标是否在使用绝对坐标的元素内,但可能有一个更简单的解决方案。
解决方案
您可以通过重复内容(放大)并在悬停时显示和隐藏它来使用 CSS 执行类似的操作。下面的简单例子。
table {
padding: 30px;
}
td {
position: relative;
padding: 4px;
border: 1px solid blue;
}
.grow {
display: none;
background-color: #fff;
border: 1px solid #000;
padding: 3px;
z-index: 10;
}
td:hover .grow {
display: block;
position: absolute;
top: 0;
left: 0;
transform: scale(1.5);
}
<html>
<head></head>
<body>
<table>
<tr>
<td>asdf<span class="grow">ASDF</span></td>
<td>fasd<span class="grow">FASD</span></td>
</table>
</body>
</html>
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