MediaWiki:Gadget-GradientHeaders.js
From Elwiki
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$('tr').each(function(){
var tr = $(this);
if(!tr.hasClass('rainbow')){
tr.children('th').each(function(){
var th = $(this);
var bgcolor = th.css('background-color');
var bgimage = th.css('background-image');
if(bgcolor != 'Rainbow' && bgimage == 'none'){
var Pc = bgcolor.match(/rgba\(\s*\d+\s*,\s*\d+\s*,\s*\d+,\s*(0?\.\d+||[01](.0*)?)\s*\)/);
Pc = Pc && Pc[1] ? Pc[1] : 1;
Pc = Math.round(255 - 17 * Pc);
var grayscale = 'rgb(' + [Pc, Pc, Pc].join() + ')';
th.css('background-image', 'linear-gradient(to bottom, ' + grayscale + ', ' + bgcolor + ')');
}
});
}
});
