[英]Expand Collapse Menu in JavaScript HTML
I have found this code to make a menu that collapses when the user clicks on the minus sign within a page. 我发现此代码可以使菜单在用户单击页面内的减号时折叠。 But the menu shows all the contents within the Main Item when the page first loads.
但是,当页面首次加载时,菜单会显示“主要项目”中的所有内容。 I would like to make the page show just the Main Item when the page loads.
我想让页面在加载时仅显示Main Item。 This is the code:
这是代码:
<script langauge="JavaScript" type="text/javascript">
function doMenu(item) {
obj=document.getElementById(item);
col=document.getElementById("x" + item);
if (obj.style.display=="none") {
obj.style.display="block";
col.innerHTML="[-]";
}
else {
obj.style.display="none";
col.innerHTML="[+]";
}
}
</script>
</head>
<body>
<a href="JavaScript:doMenu('main');" id=xmain>[+]</a> Main Item
<div id=main style="margin-left:1em">
<a href=#>Item 1</a><br>
<a href=#>Item 2</a><br>
<a href=#>Item 3</a>
</div>
<br>
</body>
</html>
I would be very grateful if someone could show me how to change the code to do this. 如果有人可以向我展示如何更改代码来做到这一点,我将非常感激。
Thanks 谢谢
Change: 更改:
<a href="JavaScript:doMenu('main');" id=xmain>
to: 至:
<a href="JavaScript:doMenu('main');" style="display: none;" id=xmain>
BTW, as some side notes the code you found is not very good. 顺便说一句,正如某些方面所述,您发现的代码不是很好。 If this is intended as a professional project I wouldn't use it.
如果这是一个专业项目,我不会使用它。
For one, I would change: 首先,我将更改:
obj.style.display="block";
to: 至:
obj.style.display="";
To avoid some bugs in certain browsers. 避免某些浏览器中的错误。
window.addEventListener('load', function(){
document.getElementById('main').style.display = 'none';
}, false);
I think that changing 我认为改变
<div id=main style="margin-left:1em">
to 至
<div id=main style="margin-left:1em; display:none">
should work. 应该管用。
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