我可以使用AngularJs指令将样式应用于伪元素 [英] Can I use AngularJs Directives to apply a style to a pseudo Element
问题描述
我希望在这里我不会错过任何明显的东西,但我正在尝试学习Angular,并且在尝试制作指令时遇到了问题。
I hope I'm not missing something obvious here but I am trying to learn Angular and I have run in to a problem whilst trying to make a directive.
我正在尝试构建一个指令,它将从一个数据属性('background-image')中获取url并将其作为背景图像应用于伪元素,但我无法确定如何定位:: before元素,或者即使Angular可以修改一个伪元素。
I am trying to build a Directive that will take the url from a data-attribute ('background-image') and apply that as a background-image to a pseudo element, but I am having trouble figuring out how to target the ::before element or even if Angular can modify a pseudo element.
这里是我正在尝试构建的指令:
http://cdpn.io/cqvGH
Here is the directive I am trying to build: http://cdpn.io/cqvGH
我可以把它应用到div.item的背景,但是当我尝试目标::之前没有喜悦。
I can get it to apply the background to div.item but when I try target the ::before no joy.
以下是指令代码:
Here is the directive code:
angular.module('testApp', [
])
angular.module('testApp')
.directive('backgroundImage', function(){
return function(scope, element, attrs){
restrict: 'A',
attrs.$observe('backgroundImage', function(value) {
// If I remove ::before it will apply image background to .item correctly.
element::before.css({
'background-image': 'url(' + value +')'
});
});
};
});
推荐答案
这很棘手,但可行。尝试如下:
It is tricky , but possible. Try something like:
var style = "<style>.item:before{background-image:url("+value+")}</style>"
angular.element("head").append(style);
在这里工作: http://codepen.io/anon/pen/Difrt
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