Javascript JQuery 选择伪元素 :after

JQuery select pseudo-element :after

提问by AiD

I want to select pseudo-element :after

我想选择伪元素 :after

This is my css :

这是我的 css：

show-more:after
{
    content : (" > ");
}

JQuerycode

JQuery代码

$(function(){
    $('.show-more:after').click(function() {
        alert("Yes");
    }); 
});

采纳答案by MartaGom

It's not possible to bind directly to pseudo-elements, since those are not part of the DOM, but the desired effect can be approximated by binding to a parent element and testing for an offset related to the element that the :afteracts upon:

不可能直接绑定到伪元素，因为它们不是 DOM 的一部分，但是可以通过绑定到父元素并测试与作用于的元素相关的偏移量来近似预期效果:after：

The following renders as ELEMENT++, where clicking on "ELEMENT" and "++" each triggers different behavior:

以下呈现为ELEMENT++，其中单击“ELEMENT”和“++”会触发不同的行为：

<span>ELEMENT</span>

span::after {
  content: '++';
  position: absolute;
}

span.c1 {
  background: yellow;
}

span.c2::after {
  background: orange;
}

const span = document.querySelector('span');

span.addEventListener('click', function (e) {
    if (e.offsetX > span.offsetWidth) {
        span.className = 'c2';
    } else {
        span.className = 'c1';
    }
});

Interactive: http://jsfiddle.net/wC2p7/1/

互动：http: //jsfiddle.net/wC2p7/1/

回答by guest271314

Edit, Updated

编辑、更新

Try

尝试

(function($) {
  jQuery.fn.extend({
    getPseudo: function(pseudo, prop) {
      var props = window.getComputedStyle(
        $(this).get(0), pseudo
      ).getPropertyValue(prop);
      return String(props);
    },
    setPseudo: function(_pseudo, _prop, newprop) {
      var elem = $(this);
      var s = $("style");
      var p = elem.getPseudo(_pseudo, _prop);
      var r = p !== "" ? new RegExp(p) : false;
      var selector = $.map(elem, function(val, key) {
        return [val.tagName
                , val.id 
                  ? "#" + val.id : null
                , val.className ? "." + val.className : null]
      });
      var _setProp = "\n" + selector.join("")
        .toLowerCase()
        .concat(_pseudo)
        .concat("{")
        .concat(_prop + ":")
        .concat(newprop + "};");
      return ((!!r ? r.test($(s).text()) : r) 
              ? $(s).text(function(index, prop) {
                  return prop.replace(r, newprop)
                }) 
              : $(s).append(_setProp)
      );
    }
  })
})(jQuery);

i.e.g., initial css:

例如，初始css：

.show-more:after {
    content : ' > ';
}

set pseudoelement

设置pseudo元素

$(".show-more-after").on("click", function() {
  $(this).setPseudo(":after", "content", "'123'")
})

github pseudo.js

github伪.js

(function($) {
  jQuery.fn.extend({
    getPseudo: function(pseudo, prop) {
      var props = window.getComputedStyle(
        $(this).get(0), pseudo
      ).getPropertyValue(prop);
      return String(props);
    },
    setPseudo: function(_pseudo, _prop, newprop) {
      var elem = $(this);
      var s = $("style");
      var p = elem.getPseudo(_pseudo, _prop);
      var r = p !== "" ? new RegExp(p) : false;
      var selector = $.map(elem, function(val, key) {
        return [val.tagName
                , val.id 
                  ? "#" + val.id : null
                , val.className ? "." + val.className : null]
      });
      var _setProp = "\n" + selector.join("")
        .toLowerCase()
        .concat(_pseudo)
        .concat("{")
        .concat(_prop + ":")
        .concat(newprop + "};");
      return ((!!r ? r.test($(s).text()) : r) 
              ? $(s).text(function(index, prop) {
                  return prop.replace(r, newprop)
                }) 
              : $(s).append(_setProp)
      );
    }
  })
})(jQuery);

$(".show-more-after").on("click", function() {
  $(this).setPseudo(":after", "content", "'123'");
})

.show-more-after:after {
    content : ' > ';
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<div class="show-more-after">click</div>

回答by Sleek Geek

Do something like this instead:

做这样的事情：

$(function(){
    $('.show-more').after().click(function() {
        alert("Yes");
    }); 
});

.show-more {
Width: 100px;
Height: 40px;
Position: relative; /* Helps you define the area you want to be clickable */
Overflow: hidden;
}


.show-more:after {
 content: 'Click me';
Left:0;
Top: 0;
width: 100%;
height: 100%;
background: red;
color: white;
padding: 15px;
line-height: 40px;
cursor: pointer;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="show-more"> </div>

回答by A.B

use this to add text after show more

在显示更多内容后使用它来添加文本

$(function(){
    $('.show-more').text($('.show-more').text()+">");
});