[英]preventDefault() on an <a> tag
I have some HTML and jQuery that slides a div
up and down to show or hide` it when a link is clicked:我有一些 HTML 和 jQuery,可以在单击链接时上下滑动
div
以显示或隐藏它:
<ul class="product-info">
<li>
<a href="#">YOU CLICK THIS TO SHOW/HIDE</a>
<div class="toggle">
<p>CONTENT TO SHOW/HIDE</p>
</div>
</li>
</ul>
$('div.toggle').hide();
$('ul.product-info li a').click(function(event){
$(this).next('div').slideToggle(200);
}
My question is: How do I use preventDefault()
to stop the link acting as a link and adding "#" to the end of my URL & jumping to the top of the page?我的问题是:如何使用
preventDefault()
停止充当链接的链接并在 URL 末尾添加“#”并跳转到页面顶部?
I can't figure out the right syntax, I just keep getting an error saying我想不出正确的语法,我一直收到一个错误说
preventDefault() is not a function.
preventDefault() 不是函数。
Try something like:尝试类似:
$('div.toggle').hide();
$('ul.product-info li a').click(function(event) {
event.preventDefault();
$(this).next('div').slideToggle(200);
});
Here is the page about that in the jQuery documentation这是jQuery 文档中关于此的页面
Set the href
attribute as href="javascript:;"
将
href
属性设置为href="javascript:;"
<ul class="product-info">
<li>
<a href="javascript:;">YOU CLICK THIS TO SHOW/HIDE</a>
<div class="toggle">
<p>CONTENT TO SHOW/HIDE</p>
</div>
</li>
</ul>
It's suggested that you do not use return false
, as 3 things occur as a result:建议您不要使用
return false
,因为结果会发生 3 件事:
So in this type of situation, you should really only use event.preventDefault();
所以在这种情况下,你真的应该只使用
event.preventDefault();
Archive of article - jQuery Events: Stop (Mis)Using Return False 文章存档 - jQuery 事件:停止(错误)使用 Return False
1 - Easy way: 1 - 简单的方法:
<a href="javascript:;">Click Me</a>
2 - using void(0): 2 - 使用 void(0):
<a href="javascript:void(0);">Click Me</a>
3 - Using preventDefault()
: 3 - 使用
preventDefault()
:
<a href='#' onclick="event.preventDefault()">Click Me</a>
4 - Yet another way of doing this in Javascript using inline onclick
, IIFE
, event
and preventDefault()
: 4 - 使用
inline onclick
、 IIFE
、 event
和preventDefault()
在 Javascript 中执行此操作的另一种方法:
<a href='#' onclick="(function(e){e.preventDefault();})(event)">Click Me</a>
Alternatively, you could just return false from the click event:或者,您可以从 click 事件中返回 false:
$('div.toggle').hide();
$('ul.product-info li a').click(function(event){
$(this).next('div').slideToggle(200);
+ return false;
});
Which would stop the A-Href being triggered.这将阻止触发 A-Href。
Note however, for usability reasons, in an ideal world that href should still go somewhere, for the people whom want to open link in new tab ;)但是请注意,出于可用性原因,在理想的世界中,对于想要在新选项卡中打开链接的人来说,href 仍然应该放在某个地方;)
<ul class="product-info">
<li>
<a href="javascript:void(0);">YOU CLICK THIS TO SHOW/HIDE</a>
<div class="toggle">
<p>CONTENT TO SHOW/HIDE</p>
</div>
</li>
</ul>
Use用
javascript:void(0);
javascript:void(0);
This is a non-JQuery solution I just tested and it works.这是我刚刚测试过的非 JQuery 解决方案,它有效。
<html lang="en">
<head>
<script type="text/javascript">
addEventListener("load",function(){
var links= document.getElementsByTagName("a");
for (var i=0;i<links.length;i++){
links[i].addEventListener("click",function(e){
alert("NOPE!, I won't take you there haha");
//prevent event action
e.preventDefault();
})
}
});
</script>
</head>
<body>
<div>
<ul>
<li><a href="http://www.google.com">Google</a></li>
<li><a href="http://www.facebook.com">Facebook</a></li>
<p id="p1">Paragraph</p>
</ul>
</div>
<p>By Jefrey Bulla</p>
</body>
</html>
After several operations, when the page should finally go to <a href"...">
link you can do the following:经过多次操作,当页面最终应该转到
<a href"...">
链接时,您可以执行以下操作:
jQuery("a").click(function(e){
var self = jQuery(this);
var href = self.attr('href');
e.preventDefault();
// needed operations
window.location = href;
});
Why not just do it in css?为什么不直接在 css 中做呢?
Take out the 'href' attribute in your anchor tag去掉锚标签中的“href”属性
<ul class="product-info">
<li>
<a>YOU CLICK THIS TO SHOW/HIDE</a>
<div class="toggle">
<p>CONTENT TO SHOW/HIDE</p>
</div>
</li>
</ul>
In your css,在你的 css 中,
a{
cursor: pointer;
}
You can make use of return false;
您可以使用
return false;
from the event call to stop the event propagation, it acts like an event.preventDefault();
从停止事件传播的事件调用开始,它的作用就像一个
event.preventDefault();
negating it.否定它。 Or you can use
javascript:void(0)
in href attribute to evaluate the given expression and then return undefined
to the element.或者您可以在 href 属性中使用
javascript:void(0)
来评估给定的表达式,然后将undefined
返回给元素。
Returning the event when it's called:调用时返回事件:
<a href="" onclick="return false;"> ... </a>
Void case:无效情况:
<a href="javascript:void(0);"> ... </a>
You can see more about in: What's the effect of adding void(0) for href and 'return false' on click event listener of anchor tag?您可以在以下内容中看到更多信息: 在锚标记的单击事件侦听器上添加 void(0) for href 和 'return false' 有什么影响?
If stopping the propagation of the event doesn't bother you, just use如果停止事件的传播不打扰您,只需使用
return false;
at the end of your handler.在您的处理程序结束时。 In jQuery it prevents the default behaviour and it stop the event bubbling.
在 jQuery 中,它阻止默认行为并停止事件冒泡。
In Javascript you can use it在Javascript 中你可以使用它
window.event.preventDefault();
It works in my case.它适用于我的情况。 write the above line into your function.
将上述行写入您的函数中。
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