I have class .hello
in css:
<style>
.hello { color:#ccc }
</style>
How can use Jquery to check class .hello
exist in style or not?
Of course, it need to check all style even in <link href='style.css' />
document.
Following will check if certain styles are applied to the element (doesn't absolutely confirms that whether it came from stylesheet)
if ($('.hello').css('color') == '#CCC') {
// true
} else {
// false
}
First specify the external file you want to search an existing class then try to replace whitespaces to "" if string "gap" was found is greater than 0 then class "gap" is found.
(function($){
jQuery.get('assets/css/main.css', function(data) {
var str = data.replace('n','');
if(str.match(/gap/g).length>0) {
console.log('class was found!');
}else{
console.log('no class!');
}
});
}) (jQuery);
You can use getComputedStyle()
for element to get the styles.
Color is obtained as rgba and is converted to hex with the logic here
$('.hello').each((i, el) => { if (rgb2hex(getComputedStyle(el).color) == "#cccccc") { console.log('#cccccc el => ', el); } }); function rgb2hex(rgb) { rgb = rgb.match(/^rgb\\((\\d+),\\s*(\\d+),\\s*(\\d+)\\)$/); return "#" + hex(rgb[1]) + hex(rgb[2]) + hex(rgb[3]); } function hex(x) { let hexDigits = new Array("0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f"); return isNaN(x) ? "00" : hexDigits[(x - x % 16) / 16] + hexDigits[x % 16]; }
.hello { color: #cccccc; }
<script src="https://code.jquery.com/jquery-3.4.1.min.js" integrity="sha256-CSXorXvZcTkaix6Yvo6HppcZGetbYMGWSFlBw8HfCJo=" crossorigin="anonymous"></script> <div class="hello"> hello </div> <div class="hi"> hi </div>
See below code snippet, the function returns the found class or id from the stylesheet or from style tag we pass. And returns an empty string if not found.
<script type="text/javascript">
function getDefinedCss(s){
if(!document.styleSheets) return '';
if(typeof s== 'string') s= RegExp('\\b'+s+'\\b','i'); // IE
capitalizes html selectors
var A, S, DS= document.styleSheets, n= DS.length, SA= [];
while(n){
S= DS[--n];
A= (S.rules)? S.rules: S.cssRules;
for(var i= 0, L= A.length; i<L; i++){
tem= A[i].selectorText? [A[i].selectorText,
A[i].style.cssText]: [A[i]+''];
if(s.test(tem[0])) SA[SA.length]= tem;
}
}
return SA.join('\n\n');
}
console.log(getDefinedCss ('ui-helper-hidden'));
</script>
Let me know if it works for you.
Simpler still..
if($('.<class name>').length <= 0)
{
// load style sheet
$('<link href="style sheet ULR" rel="stylesheet">').appendTo("head");
}
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