Conditionals for several CSS elements
Question
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. 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.
I know one solution is to create a conditional within the JavaScript/JQuery code that will handle the style changes:
if(condition == true) {
$(".element").css("left", "360px");
}
That seems like an okay solution for CSS styles that have only a couple of changing attributes. However, in my case I would have to write 100~ lines of code just for the if else statement. Is there a more intuitive way to do this task?
3 answers
solution1
2 ACCPTED 2018-07-17 18:18:06
Perhaps you could add a class to a parent like <body>
if(condition == true) {
$('body').addClass('conditional-class');
}
And add specific rules in css:
.conditional-class .element{
top: 360px;
}
solution2
0 2018-07-17 18:21:17
You could use objects to keep css, needed for some condition. For example:
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
solution3
0 2018-07-17 18:27:09
You can add a separate css file using javascript -
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.
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