使用javascript编辑所有外部链接 [英] Editing all external links with javascript

问题描述

我怎样才能通过javascript的div中的所有外部链接，添加（或附加）一个类和alt-text？

我想我需要获取div元素中的所有对象，然后检查每个对象是否为a，并检查href属性是否以http（s）开头：//（然后应该是外部链接），然后将内容添加到alt和class属性（if它们不存在创建它们，如果它们存在的话;附加想要的值）。

但是，如何在代码中执行此操作？

解决方案

这个测试：

 < style type =text / css> 
 .AddedClass 
 {
 background-color：＃88FF99; 
} 
< / style> 
< script type =text / javascript> 
 window.onload = function（）
 {
 var re = /^(https?:\/\/[^\/]+).*$/; 
 var currentHref = window.location.href.replace（re，'$ 1'）; 
 var reLocal = new RegExp（'^'+ currentHref.replace（/\./，'\\。'））; 
 
 var linksDiv = document.getElementById（Links）; 
 if（linksDiv == null）return; 
 var links = linksDiv.getElementsByTagName（a）; 
 for（var i = 0; i< links.length; i ++）
 {
 var href = links [i] .href; 
 if（href ==''|| reLocal.test（href）||！/ ^ http / .test（href））
 continue; 
 if（links [i] .className！= undefined）
 {
 links [i] .className + ='AddedClass'; 
} 
 else 
 {
 links [i] .className ='AddedClass'; 
} 
 if（links [i] .title！= undefined&& links [i] .title！=''）
 {
 links [i] .title + ='（外部链接）'; 
} 
 else 
 {
 links [i] .title ='外部链接'; 
} 
} 
} 
< / script> 
 
< div id =Links> 
< a name =_ Links>< / a> 
< a href =/ foo.asp> FOO< / a> 
< a href =ftp://FTP.org/FILE.zip> FILE< / a> 
< a href =http://example.com/somewhere.html> SomeWhere< / a> 
< a href =http://example.com/somewhere2.htmlclass =Gah> SomeWhere 2< / a> 
< a href =http://example.com/somewhere3.htmltitle =它走到某个地方> SomeWhere 3< / a> 
< a href =https://another-example.com/elsewhere.php?foo=bar> ElseWhere 1< / a> 
< a href =https://another-example.com/elsewhere.php?foo=bozclass =Doh> ElseWhere 2< / a> 
 < a href =deep / below / bar.asp> BAR< / a> 
< a href =javascript：ShowHideElement（'me'）;>显示/隐藏< / a> 
< / div> 
  

如果您使用的是共享服务器上的帐户，例如 http://big-server.com/~UserName/ ，您可能需要对URL进行硬编码以超越顶级。另一方面，如果你想 http://foo.my-server.com你可能想改变RE 和 http://bar.my-server.com 标记为本地。

[UPDATE]良好的评论后改进的鲁棒性...

我不强调FTP或其他协议，他们可能应该有一个明显的例程。 p>

How can I go through all external links in a div with javascript, adding (or appending) a class and alt-text?

I guess I need to fetch all objects inside the div element, then check if each object is a , and check if the href attributen starts with http(s):// (should then be an external link), then add content to the alt and class attribute (if they don't exist create them, if they do exists; append the wanted values).

But, how do I do this in code?

解决方案

This one is tested:

<style type="text/css">
.AddedClass
{
  background-color: #88FF99;
}
</style>
<script type="text/javascript">
window.onload = function ()
{
  var re = /^(https?:\/\/[^\/]+).*$/;
  var currentHref = window.location.href.replace(re, '$1');
  var reLocal = new RegExp('^' + currentHref.replace(/\./, '\\.'));

  var linksDiv = document.getElementById("Links");
  if (linksDiv == null) return;
  var links = linksDiv.getElementsByTagName("a");
  for (var i = 0; i < links.length; i++)
  {
    var href = links[i].href;
    if (href == '' || reLocal.test(href) || !/^http/.test(href))
      continue;
    if (links[i].className != undefined)
    {
      links[i].className += ' AddedClass';
    }
    else
    {
      links[i].className = 'AddedClass';
    }
    if (links[i].title != undefined && links[i].title != '')
    {
      links[i].title += ' (outside link)';
    }
    else
    {
      links[i].title = 'Outside link';
    }
  }
}
</script>

<div id="Links">
<a name="_Links"></a>
<a href="/foo.asp">FOO</a>
<a href="ftp://FTP.org/FILE.zip">FILE</a>
<a href="http://example.com/somewhere.html">SomeWhere</a>
<a href="http://example.com/somewhere2.html" class="Gah">SomeWhere 2</a>
<a href="http://example.com/somewhere3.html" title="It goes somewhere">SomeWhere 3</a>
<a href="https://another-example.com/elsewhere.php?foo=bar">ElseWhere 1</a>
<a href="https://another-example.com/elsewhere.php?foo=boz" class="Doh">ElseWhere 2</a>
<a href="https://another-example.com/elsewhere.php?foo=rad" title="It goes elsewhere">ElseWhere 3</a>
<a href="deep/below/bar.asp">BAR</a>
<a href="javascript:ShowHideElement('me');">Show/Hide</a>
</div>

If you are on an account on a shared server, like http://big-server.com/~UserName/, you might want to hard-code the URL to go beyond the top level. On the other hand, you might want to alter the RE if you want http://foo.my-server.com and http://bar.my-server.com marked as local.

[UPDATE] Improved robustness after good remarks...
I don't highlight FTP or other protocols, they probably deserve a distinct routine.

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