漂亮的?没有。功能性?是的。如果我已经工作了 20 个小时并想快速将某些东西拼凑在一起,我会这样做。与往常一样,不可预见的项目限制可能会使解决方案变得比无用更糟糕。ymmv(第 2 到第 5 个函数未使用,只是模板的一部分)
<!DOCTYPE html>
<html>
<head>
<script>
function byId(e){return document.getElementById(e);}
function newEl(tag){return document.createElement(tag);}
function newTxt(txt){return document.createTextNode(txt);}
function toggleClass(element, newStr)
{
index=element.className.indexOf(newStr);
if ( index == -1)
element.className += ' '+newStr;
else
{
if (index != 0)
newStr = ' '+newStr;
element.className = element.className.replace(newStr, '');
}
}
function forEachNode(nodeList, func)
{
var i, n = nodeList.length;
for (i=0; i<n; i++)
{
func(nodeList[i], i, nodeList);
}
}
window.addEventListener('load', mInit, false);
function mInit()
{
uploadBtn.addEventListener('mouseover', onBtnHover, false);
uploadBtn.addEventListener('mouseout', onBtnLeave, false);
}
function onBtnHover()
{
var btn = byId('uploadBtn');
var xPos, yPos;
xPos = btn.offsetLeft + btn.offsetWidth + 32;
yPos = btn.offsetTop;
var tgt = byId('popup');
var btnHeight, popupHeight;
btnHeight = btn.offsetHeight;
popupHeight = tgt.offsetHeight;
var vertOffset = (popupHeight-btnHeight) / 2;
var styleStr = "display: inline-block; visibility: visible;";
tgt.setAttribute('style', styleStr);
tgt.style.left = xPos+"px";
tgt.style.top = yPos-vertOffset+"px";
}
function onBtnLeave()
{
var tgt = byId('popup');
tgt.removeAttribute('style');
}
</script>
<style>
.controls
{
border: solid 2px #aaa;
padding: 16px;
}
#popup
{
visibility: hidden;
z-index: 2;
position: absolute;
max-width: 300px;
border-radius: 4px;
font-family: verdana;
background-color: #6495ee;
color: white;
padding: 8px;
font-size: 0.8em;
box-shadow: 4px 4px 2px rgba(0,0,0,0.3);
}
#popup b
{
background: white;
color: black;
padding: 4px;
border-radius: 4px;
border: solid 1px #777;
}
</style>
</head>
<body>
<div class='controls'>
<button id='uploadBtn'>Upload<br>file(s)</button>
</div>
<div id='popup'>To upload multiple files, <b>Shift</b> + click files in the dialog box..</div>
</body>
</html>