使用 Javascript 显示/隐藏表格行 - 可以使用 ID - 如何使用类? [英] Showing/Hiding Table Rows with Javascript - can do with ID - how to do with Class?
问题描述
我有一张表格，其中列出了吉他商店中的商品 - 每行包含一件商品.每一行(和每件商品)都是新的、二手的或寄售的.我希望用户能够单击侧边栏 UL 中的链接(单击新建"、使用"或缺点")，并且只有相应条件的表格行保持可见.因此，如果用户单击已使用"，则所有 New 和 Cons 行都将隐藏.
I have a table which lists merchandise in a Guitar Store - each row contains one piece of merchandise. Each row (and each piece of merchandise) is either New, Used or on Consignment. I'd like for a user to be able to click a link in a sidebar UL (clicking on either New, Used, or Cons) and have only the table rows of that corresponding condition remain visible. So if a user clicked "Used" then all New and Cons rows would become hidden.
我已经用一些简单的 JavaScript 完成了这项工作，但它使用了 getElementByID 这对我不起作用，因为我需要用类来识别 TR.所以这就是我被难住的地方.我不知道如何使这个工作与类.
I have made this work with some simple JavaScript, but it uses getElementByID which won't work for me because I need to identify the TRs with classes. So that's where I get stumped. I'm not sure how to make this work with classes.
这是我迄今为止制定的解决方案:
Here's the solution I've worked out so far:
<html>
<head>
<script>
function used() {
document.getElementById("new").style.display = 'none';
document.getElementById("cons").style.display = 'none';
document.getElementById("used").style.display = '';
}
function news() {
document.getElementByClass("new").style.display = '';
document.getElementById("cons").style.display = 'none';
document.getElementById("used").style.display = 'none';
}
function cons() {
document.getElementByClass("new").style.display = 'none';
document.getElementById("cons").style.display = '';
document.getElementById("used").style.display = 'none';
}
</script>
</head>
<body>
<span onClick="used();">Used</span><br />
<span onClick="news();">New</span><br />
<span onClick="cons();">Cons</span><br /><br />
<table border="1">
<tr id="used">
<td>Used</td>
</tr>
<tr id="new">
<td>New</td>
</tr>
<tr id="cons">
<td>Cons</td>
</tr>
</table>
</body>
</html>
上面的代码工作正常，如果我可以让它与类一起工作，它将解决我的紧迫需求.但是，最终我想将其扩展到品牌也可以使用 - 以便用户可以单击品牌并仅查看该品牌的帖子.在那种情况下，我的表中可能有 20 或 30 个品牌，因此上述情况并不理想.此外，这最终将存在于 Wordpress 站点中，理想情况下，我会根据 wordpress 中的元数据为每个品牌创建类，并类似地创建一个动态 UL，其中包含切换表的品牌，以及一个可以工作的 js 解决方案随着一组不断变化的变量！所以我知道我上面的方法不是最好的方法，但这是我现在唯一可以尝试的方法.
The above code works ok, and if I could get it to work with classes instead it would solve my immediate need. However, ultimately I'd like to scale this up to use for Brands as well - so that a user could click on a brand and see only the posts for that brand. In that situation I might have 20 or 30 brands in the table, so the above would not be ideal. Also this will ultimately live in a Wordpress site, and I would ideally be creating the classes for each brand from meta data in wordpress and similarly creating a dynamic UL containing the brands that toggle the table, as well as having a js solution that can work with a changing set of variables! So I know that what I have above is not the best approach, but it's the only one I know enough to try right now.
对上述问题的帮助将不胜感激 - 当我转向更具挑战性的品牌方面时，我将如何更有效地做到这一点.
Help with the above would be most appreciated - as would advice about how I might do this more effectively as I move towards the more challenging Brands aspect.
Google 帮助了我，我有了新的方向 - 这可能会解决我的问题:
Google helped me out, and I have a new direction - this might solve my problem:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"></script>
<title>Sandbox</title>
<meta http-equiv="Content-type" content="text/html; charset=utf-8" />
<style type="text/css" media="screen">
</style>
</head>
<body>
<ul class="side-nav">
<li><a class="cond" href="#">Show all</a></li>
<li><a class="used" href="#">Used</a></li>
<li><a class="new" href="#">New</a></li>
<li><a class="cons" href="#">Cons</a></li>
</ul>
<table>
<tr class="cond used">
<td>A Used Item</td>
<td>Used.</td>
</tr>
<tr class="cond new">
<td>A New Item</td>
<td>New</td>
</tr>
<tr class="cond cons">
<td>A Cons Item</td>
<td>Cons</td>
</tr>
</table>
<script>
$(function()
{
$('ul.side-nav a').click(function()
{
$('tr.cond').hide();
$('tr.' + $(this).attr('class')).show();
});
});
</script>
</body>
</html>
推荐答案
document.getElementsByClassName 返回一个 NodeList，而不是单个元素，我建议使用 jQuery，因为你只需要使用类似 $('.new').toggle()
document.getElementsByClassName returns a NodeList, not a single element, I'd recommend either using jQuery, since you'd only have to use something like $('.new').toggle()
或者如果你想要纯 JS 尝试:
or if you want plain JS try :
function toggle_by_class(cls, on) {
var lst = document.getElementsByClassName(cls);
for(var i = 0; i < lst.length; ++i) {
lst[i].style.display = on ? '' : 'none';
}
}
这篇关于使用 Javascript 显示/隐藏表格行 - 可以使用 ID - 如何使用类?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
