几个CSS元素的条件
[英]Conditionals for several CSS elements
问题描述
I have a CSS file that was originally embedded within a JavaScript file, so conditionals could be created by combining the CSS embedded style sheet with JavaScript logic. 
我有一个最初嵌入JavaScript文件中的CSS文件，因此可以通过将CSS嵌入样式表与JavaScript逻辑结合来创建条件。 I am now in the process of separating the CSS and JavaScript files and have problems dealing with the larger chunks of CSS affected by a single conditional. 我现在正在分离CSS和JavaScript文件，并且在处理受单个条件影响的较大CSS块时遇到问题。
I know one solution is to create a conditional within the JavaScript/JQuery code that will handle the style changes: 我知道一种解决方案是在JavaScript / JQuery代码中创建一个条件来处理样式更改：
if(condition == true) {
$(".element").css("left", "360px");
}
That seems like an okay solution for CSS styles that have only a couple of changing attributes. 对于只有几个变化属性的CSS样式，这似乎是一个好的解决方案。 However, in my case I would have to write 100~ lines of code just for the if else statement. 但是，就我而言，我只需要为if else语句写100几行代码。 Is there a more intuitive way to do this task? 有没有更直观的方法来执行此任务？
3 个解决方案
解决方案1
2 已采纳 2018-07-17 18:18:06
Perhaps you could add a class to a parent like <body> 也许您可以将类添加到像<body>这样的父类中
if(condition == true) {
$('body').addClass('conditional-class');
}
And add specific rules in css: 并在CSS中添加特定规则：
.conditional-class .element{
top: 360px;
}
解决方案2
0 2018-07-17 18:21:17
You could use objects to keep css, needed for some condition. 您可以使用对象保留某些条件所需的css。 For example: 例如：
const firstCondition = { outline: '1px solid red', backgroundColor: 'blue', color: 'white' }; const secondCondition = { outline: '1px solid blue', backgroundColor: 'red', color: 'yellow' }; function applyStyles(node, styles){ Object.keys(styles).forEach((key) => { node.style[key] = styles[key]; }); } let counter = 0; const target = document.querySelector("#target"); function switchStyles(){ if(counter % 2 === 0){ applyStyles(target, firstCondition); }else if(counter % 2 === 1){ applyStyles(target, secondCondition); } counter++; }
<div> <div id="target"> Hello! </div> <button onClick="switchStyles()">Switch style</button> </div>
For further learning, I recommend you reading about jss 为了进一步学习，我建议您阅读有关jss的文章。
解决方案3
0 2018-07-17 18:27:09
You can add a separate css file using javascript - 您可以使用JavaScript添加单独的CSS文件-
if(condition == true) {
$('head').append('<link rel="stylesheet" type="text/css" href="style.css">');
} else {
$('head').append('<link rel="stylesheet" type="text/css" href="index.css">');
}
short and simple, yet effective in your case. 简短，简单，但对您而言有效。
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