MediaWiki:Gadget-GradientHeaders.js
From Elwiki
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$('tr:not(.rainbow)').each(function(){
var regAlpha = /rgba\(\s*\d+\s*,\s*\d+\s*,\s*\d+,\s*(0?\.\d+|[01](\.0*)?)\s*\)/;
var tr = $(this);
var bgcolor = tr.css('background-color');
var bgimage = tr.css('background-image');
if(bgcolor != 'Rainbow' && bgimage == 'none'){
var Pc = bgcolor.match(regAlpha);
Pc = Pc && Pc[1] ? Pc[1] : 1;
Pc = Math.round(255 - 17 * Pc);
var grayscale = 'rgb(' + [Pc, Pc, Pc].join() + ')';
tr.children('th').each(function(){
var th = $(this);
var Hbgcolor = th.css('background-color');
var Hbgimage = th.css('background-image');
if(Hbgcolor != 'Rainbow' && Hbgimage == 'none'){
if(Hbgcolor == bgcolor){
var Hgrayscale = grayscale;
}
else{
var HPc = Hbgcolor.match(regAlpha);
HPc = HPc && HPc[1] ? HPc[1] : 1;
HPc = Math.round(255 - 17 * Pc);
var Hgrayscale = 'rgb(' + [HPc, HPc, HPc].join() + ')';
}
th.css('background-image', 'linear-gradient(to bottom, ' + Hgrayscale + ', ' + Hbgcolor + ')');
}
});
}
});
