使用选择元素在 Safari 上进行 webkit-transform 问题
我正在为 ipad 开发一个 web 应用程序，并且在使用 webkit-transform 移动 div 时遇到了使用选择选项元素的问题。请原谅表格布局，但我正在尝试尽可能地在应用程序中复制该问题。
单击绿色框，面板向左移动，选择框就可以了。重新加载页面并单击红色框，面板向左移动（使用 webkit-transform），当您单击选择框时，列表将显示在浏览器外部，并且容器框会跳转。
请注意，这在最新的 GA chrome 版本上不是问题。
<html>
<head>
<title>Select Testing</title>
<style>
.button {
position: relative;
width: 44px;
height: 44px;
}
#moveGood {
background-color: lime;
}
#moveBad {
background-color: red;
}
div#panels {
position: relative;
height: 100%
}
div.panel {
position: relative;
top: 0px;
left: 0px;
width: 200px;
height: 50px;
border: 2px solid black;
}
.leftBad {
-webkit-transform: translate3d(-200px, 0, 0);
}
.leftGood {
left: -200px;
}
div#panelContainer {
position: absolute;
top: 100px;
left: 0;
overflow: hidden;
width: 210px;
}
</style>
<script type="text/javascript">
function leftBad() {
document.getElementById("panels").className += ' leftBad';
}
function leftGood() {
document.getElementById("panels").className += ' leftGood';
}
</script>
</head>
<body>
<div id="moveBad" class="button" onclick="leftBad();"></div>
<div id="moveGood" class="button" onclick="leftGood()";></div>
<div id="panelContainer">
<div id="panels">
<table>
<tr>
<td>
<div id="page1" class="panel">
</div>
</td>
<td>
<div id="page2" class="panel">
<select>
<option value="volvo">
Volvo
</option>
<option value="saab">
Saab
</option>
<option value="mercedes">
Mercedes
</option>
<option value="audi">
Audi
</option>
</select>
</div>
</td>
</tr>
</table>
</div>
</div>
</body>
</html>
I am developing a webapp for ipad and have come across an issue using select option elements when moving divs with webkit-transform. Forgive the table layout but I'm trying to replicate the issue in the app as closely as possible.
Click on the green box and the panels move to the left and the select box is fine. Reload the page and click on the red box and the panels move to the left (using webkit-transform) and when you click on the select box, the list is displayed outside of the browser and the container box jumps.
Note that this is not an issue on the latest GA chrome builds.
<html>
<head>
<title>Select Testing</title>
<style>
.button {
position: relative;
width: 44px;
height: 44px;
}
#moveGood {
background-color: lime;
}
#moveBad {
background-color: red;
}
div#panels {
position: relative;
height: 100%
}
div.panel {
position: relative;
top: 0px;
left: 0px;
width: 200px;
height: 50px;
border: 2px solid black;
}
.leftBad {
-webkit-transform: translate3d(-200px, 0, 0);
}
.leftGood {
left: -200px;
}
div#panelContainer {
position: absolute;
top: 100px;
left: 0;
overflow: hidden;
width: 210px;
}
</style>
<script type="text/javascript">
function leftBad() {
document.getElementById("panels").className += ' leftBad';
}
function leftGood() {
document.getElementById("panels").className += ' leftGood';
}
</script>
</head>
<body>
<div id="moveBad" class="button" onclick="leftBad();"></div>
<div id="moveGood" class="button" onclick="leftGood()";></div>
<div id="panelContainer">
<div id="panels">
<table>
<tr>
<td>
<div id="page1" class="panel">
</div>
</td>
<td>
<div id="page2" class="panel">
<select>
<option value="volvo">
Volvo
</option>
<option value="saab">
Saab
</option>
<option value="mercedes">
Mercedes
</option>
<option value="audi">
Audi
</option>
</select>
</div>
</td>
</tr>
</table>
</div>
</div>
</body>
</html>
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当选择框部分不在视图中时，如果您看到： http://jsfiddle.net/H5J27，Safari /
第一个示例没有 -webkit-transform，但是当您单击它时，它会移位以完全显示它。
现在，Safari 显然没有意识到，一旦转换，选择框就会处于完整视图中。引擎仍然认为它被部分遮挡，并且会将选择框及其父容器移动到它认为您可以看到它的位置。
解决方法并不是很令人鼓舞。我猜你将这与动画结合起来是为了享受硬件加速的好处，所以我会添加一个事件侦听器和动画的结尾，删除 css 转换并应用正常定位。如果您必须在多个元素上执行此操作，这会变得很复杂，但对于一次性操作来说已经足够了。
Safari tries to be helpful when there's a select box partially out of view, if you see:
http://jsfiddle.net/H5J27/
The first example doesn't have -webkit-transform, but when you click on it, it will be displaced in order to reveal it fully.
Now, Safari apparently isn't aware that, once transformed, the select box is in full view. The engine still thinks it's partially obstructed and it will move the select box and it's parent container to a point where it thinks you can see it.
The workarounds are not very encouraging. I'm guessing you're doing this coupled with animation in order to enjoy the benefits of hardware acceleration, so I'd add an event listener and the end of the animation, remove the css transform and apply normal positioning. This will get complicated if you have to do it on several elements, but it's good enough for a one time thing.