有时，软件安装程序会强制您在启用“我同意”框之前滚动到 EULA 的末尾。如何在网页上产生同样的效果？
<html>
<head>
<script type="text/javascript">
function setupPage() {
var agreement = document.getElementById("agreetext");
var visibleHeight = agreement.clientHeight;
var scrollableHeight = agreement.scrollHeight;
if (scrollableHeight > visibleHeight) {
var checkbox = document.getElementById("agreebox");
checkbox.checked=false;
checkbox.disabled=true;
agreement.onscroll = handleScroll;
}
}
function handleScroll() {
var agreement = document.getElementById("agreetext");
var visibleHeight = agreement.clientHeight;
var scrollableHeight = agreement.scrollHeight;
var position = agreement.scrollTop;
if (position + visibleHeight == scrollableHeight) {
document.getElementById("agreebox").disabled=false;
}
}
</script>
</head>
<body>
<form>
<textarea id="agreetext" rows="8" cols="40">Long agreement</textarea>
<br/><br/>
<input type="checkbox" id="agreebox" value="true"/> <label id="agreelabel" for="agreebox">I agree</label>
<br/><br/>
<input type="submit" value="Continue"/>
</form>
<script type="text/javascript">
// We put this at the end of the page rather than in an document.onload
// because the document.onload event doesn't fire until all images have loaded.
setupPage();
</script>
</body>
</html>
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