Remove li tags using javascript array

问题

I'm searching a solution to remove <li> tags filtered using javascript array.

Array:

var mygroups=["1","8","3","4","5"]

Example (input):

<li><div>1 element.</div></li>
<li><div>2 element. This is my <span>post</span> into new group</div></li>
<li><div>3 element. Another one</li>
<li><div>
         <a href="javascript:void(0);">Actor</a>
         <a href="/groups/viewgroup/1-first-group">First group</a>
    </div>
</li>
<li><div><a href="javascript:void(0);">Actor</a>
         <a href="/groups/viewgroup/10-ten-group">Ten group</a>5 element. This is my <span>new post</span></div></li>
<li>
   <div>6 element. <a href="/j1.5/index.php/jomsocial/63-zzz/profile">Actor</a></div>
   <div><a href="/groups/viewgroup/test/5-second-group">Group other</a></div>
</li>
<li>7 element.</li>
<li><div><a href="/groups/viewgroup/test/8-second-group">First group</a></div></li>
<li><div><a href="/groups/viewgroup/16-other-group">First group</a></div></li>
<li><div><a href="/j1.5/index.php?option=com_community&view=groups&task=viewgroup&groupid=1&Itemid=4">My other group </a></div></li>

How to get this output (Remove all instances which do not contain group in array in anchor):

<li><div>
         <a href="javascript:void(0);">Actor</a>
         <a href="/groups/viewgroup/1-first-group">First group</a>
    </div>
</li>
<li>
   <div>6 element. <a href="/j1.5/index.php/jomsocial/63-zzz/profile">Actor</a></div>
   <div><a href="/groups/viewgroup/test/5-second-group">Group other</a></div>
</li>
<li><div><a href="/groups/viewgroup/test/8-second-group">First group</a></div></li>
<li><div><a href="/j1.5/index.php?option=com_community&view=groups&task=viewgroup&groupid=4&Itemid=4">My other group </a></div></li>

This code is not working right:

    $('li').filter(function() {
    var a = $(this).find('a');
    if (!a.length)
        return true;

    var text = a.attr('href').split('/')[3];
    text = text.substring(0, text.indexOf('-'));
    if ($.inArray(text , mygroups) >= 0)
        return false;

    return true;
}).remove();

And this one does the job neither:

 $('li').filter(function() {
    if($(this).is('*:has(a[href|=/group/viewgroup/])') {
        var href = $(this).find('a').attr('href'),
            trail = href.split('/')[3],
            number = + /(\d+)-/.exec(trail)[1];
        return $.inArray(myarray, +number) == -1;
    }
    return true;
}).remove();

回答1:

This seems to do what you want. It's not the tidiest code in the world though:

$('li').filter(function() {
    var a = $(this).find('a');
    if (!a.length)
        return true;

    var text = /(\d+)-/.exec(a.attr('href'))[1];  
    if ($.inArray(text , mygroups) >= 0)
        return false;

    return true;
}).remove();

It's getting all the li's, then filtering out any that have a matching value to the array and removing the ones that are left.

http://jsfiddle.net/8AmNR/5/

回答2:

How about using a filter function.

In this scenario you select all the li and filter out the desired one.

$('li').filter(function(index){
    if(/*condition applied*/){
        ....
    }
});

回答3:

$('li').filter(function() {
    if($(this).is('*:has(a[href|=/group/viewgroup/])') {
        var href = $(this).find('a').attr('href'),
            trail = href.split('/')[3],
            number = + /(\d+)-/.exec(trail)[1];
        return $.inArray(myarray, +number) == -1;
    }
    return true;
}).remove();

回答4:

This works

$("li").each(function() {
          if($(this).find("a").size() == 0) {
              $(this).remove();
          };
    });

来源：https://stackoverflow.com/questions/7066164/remove-li-tags-3