How do I check for empty attr() in jquery?

问题

I have a few divs that are created using PHP. The anchor within the div always has a HREF, even if it is blank. Basically, I am trying to detect if the HREF is blank. If it has content, do nothing, if it's blank, strip the text out, delete the anchor, them put the text back in.

Here is the div:

<div class="title"> 
    <a class="article" href="">Lorem Ipsum</a> 
</div>

Here is my code:

jQuery(document).ready(function($) { //required for $ to work in Wordpress

    $(".article").each(function(){
        if ($(this).attr('href') !== undefined) {
            return;
        } else {
            var linkTitle = $(this).html();
            $(this).parent().empty().html(linkTitle);
        }                               
    });    
//-->
});

回答1:

You can check for an empty href attribute and "unwrap" those links using .replaceWith() like this:

$(".article[href='']").replaceWith(function() { return this.innerHTML; });

You can give it a try here.

回答2:

You can simply test the attribute as a boolean instead of testing it against undefined:

if ($(this).attr('href')) {
  // href is not blank
} else {
  // href is blank
}

回答3:

To simply get rid of the 'href' attribute:

$("#myLink[href='']").removeAttr('href');

For multiple targeting, for example the 'style' attribute:

$("#myDiv td, a, p, table, nav, header[style='']").removeAttr('style');

This way, you'll only get rid of the Attribute when it's empty instead of deleting the whole element itself.

A full code example would be:

$('#myDiv table, tr, td, a, p').each(function() { 
if ($(this).attr('style') == '') { 
    $(this).removeAttr('style'); 
} 
})

来源：https://stackoverflow.com/questions/3773195/how-do-i-check-for-empty-attr-in-jquery

标签

jquery

each

attr