jQuery: HEX to RGB calculation different between browsers?
The following piece of code works perfectly in all browsers, bar IE. As usual. This is what needs to happen:
As I said, so far the code works absolutely fine, except in IE. Can anyone with a fresh set of eyes (and an intact hairline) take a look at this? Can it be done different?
function getRGB(color) {
// Function used to determine the RGB colour value that was passed as HEX
var result;
// Look for rgb(num,num,num)
if (result = /rgb(s*([0-9]{1,3})s*,s*([0-9]{1,3})s*,s*([0-9]{1,3})s*)/.exec(color)) return [parseInt(result[1]), parseInt(result[2]), parseInt(result[3])];
// Look for rgb(num%,num%,num%)
if (result = /rgb(s*([0-9]+(?:.[0-9]+)?)%s*,s*([0-9]+(?:.[0-9]+)?)%s*,s*([0-9]+(?:.[0-9]+)?)%s*)/.exec(color)) return [parseFloat(result[1]) * 2.55, parseFloat(result[2]) * 2.55, parseFloat(result[3]) * 2.55];
// Look for #a0b1c2
if (result = /#([a-fA-F0-9]{2})([a-fA-F0-9]{2})([a-fA-F0-9]{2})/.exec(color)) return [parseInt(result[1], 16), parseInt(result[2], 16), parseInt(result[3], 16)];
// Look for #fff
if (result = /#([a-fA-F0-9])([a-fA-F0-9])([a-fA-F0-9])/.exec(color)) return [parseInt(result[1] + result[1], 16), parseInt(result[2] + result[2], 16), parseInt(result[3] + result[3], 16)];
}
var $oldColour;
// Get all the links I want to target
$('a').not('aside.meta a.notes_link, aside.meta ul li a, section.social_media a, footer a').hover(function() {
//code when hover over
//set the old colour as a variable so we can animate to that value when hovering away
$oldColour = $(this).css('color');
//run the getRGB function to get RGB value of the link we're hovering over
var rgb = getRGB($(this).css('color'));
for (var i = 0; i < rgb.length; i++)
//for each of the 3 HEX values, determine if the value + an increment of 30 (for a lighter colour) is lighter than the max (255)
//if it is, use the HEX value plus the increment, else use the max value
rgb[i] = Math.min(rgb[i] + 30, 255);
//join the new three new hex pairs together to form a sinle RGB statement
var newColor = 'rgb(' + rgb[0] + ',' + rgb[1] + ',' + rgb[2] + ')';
//animate the text link color to the new color.
$(this).animate({'color': newColor}, 500);
}, function() {
//code when hovering away
//animate the colour back using the old colour determined above
$(this).animate({'color': $oldColour}, 500);
});
I look forward to hearing from you Guru's.
Don't have IE to test it, but if the issue shows only for the first time, try using setTimeout with a very small timeout (10ms or so) to call your code the second time.
Also, it might be worth just finding out what part of the code is not working - I suppose $oldColour = $(this).css('color'); , but add some console.log and find out, it will probably help and you might even find out something else is happening that you don't see right now.
EDIT: Something like this:
$oldColour = $(this).css('color');
var rgb;
if($oldColour.substring(0, 3) == 'rgb') {
rgb = getRGB($oldColour);
} else { // it's a hex
rgb = getFromHex($oldColour);
}
where getFromHex can be something like the one from http://www.richieyan.com/blog/article.php?artID=32, modified to work as you expect:
function hex2rgb(hexStr){
// note: hexStr should be #rrggbb
var hex = parseInt(hexStr.substring(1), 16);
var r = (hex & 0xff0000) >> 16;
var g = (hex & 0x00ff00) >> 8;
var b = hex & 0x0000ff;
return [r, g, b];
}
有了冰雹的帮助，这就是最终代码的样子：
function getRGB(color) {
var result;
// Look for rgb(num,num,num)
if (result = /rgb(s*([0-9]{1,3})s*,s*([0-9]{1,3})s*,s*([0-9]{1,3})s*)/.exec(color)) return [parseInt(result[1]), parseInt(result[2]), parseInt(result[3])];
// Look for rgb(num%,num%,num%)
if (result = /rgb(s*([0-9]+(?:.[0-9]+)?)%s*,s*([0-9]+(?:.[0-9]+)?)%s*,s*([0-9]+(?:.[0-9]+)?)%s*)/.exec(color)) return [parseFloat(result[1]) * 2.55, parseFloat(result[2]) * 2.55, parseFloat(result[3]) * 2.55];
// Look for #a0b1c2
if (result = /#([a-fA-F0-9]{2})([a-fA-F0-9]{2})([a-fA-F0-9]{2})/.exec(color)) return [parseInt(result[1], 16), parseInt(result[2], 16), parseInt(result[3], 16)];
// Look for #fff
if (result = /#([a-fA-F0-9])([a-fA-F0-9])([a-fA-F0-9])/.exec(color)) return [parseInt(result[1] + result[1], 16), parseInt(result[2] + result[2], 16), parseInt(result[3] + result[3], 16)];
}
var $oldColour;
$('a').not('aside.meta a.notes_link, aside.meta ul li a, section.social_media a, footer a').hover(function() {
//code when hover over
$(this).stop(true, true);
$oldColour = $(this).css('color');
var rgb;
function hex2rgb(hexStr){
// note: hexStr should be #rrggbb
var hex = parseInt(hexStr.substring(1), 16);
var r = (hex & 0xff0000) >> 16;
var g = (hex & 0x00ff00) >> 8;
var b = hex & 0x0000ff;
return [r, g, b];
}
if($oldColour.substring(0, 3) == 'rgb') {
rgb = getRGB($oldColour);
} else { // it's a hex
rgb = hex2rgb($oldColour);
}
for (var i = 0; i < rgb.length; i++)
rgb[i] = Math.min(rgb[i] + 30, 255);
var newColor = 'rgb(' + rgb[0] + ',' + rgb[1] + ',' + rgb[2] + ')';
$(this).animate({'color': newColor}, 500);
}, function() {
//code when hovering away
$(this).stop(true, true);
$(this).animate({'color': $oldColour}, 500);
});
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