JavaScript变量的背景颜色十六进制 [英] Background-color hex to JavaScript variable
问题描述
我对JavaScript和jQuery很陌生,现在我面临一个问题:
我需要将一些数据发布到PHP和一些数据需要为div X的背景颜色十六进制。
jQuery具有css(background-color)函数,并且可以获取背景的RGB值到一个JavaScript变量。
CSS函数似乎返回像这样rgb(0,70,255)的字符串。
我找不到任何方法来获取背景颜色的十六进制(即使它在CSS中设置为十六进制)。
所以看起来我需要将其转换。我找到了一个将RGB转换为十六进制的函数,但它需要用三个不同的变量r,g和b来调用。所以我需要将字符串rgb(x,xx,xxx)解析为var r = x; var g = xx; var b = xxx;不知何故。
我试图用JavaScript解析字符串,但我并不真正了解正则表达式。
有没有办法让div的背景颜色为十六进制,或者字符串可以转换为3个不同的变量?
<解决方案
var rgbString =rgb( 0,70,255); //以任何方式获取此信息。
var parts = rgbString.match(/ ^ rgb\((\ d +),\ s *(\ d +),\ s *(\ d +)\)$ /);
// parts现在应该是[rgb(0,70,255,0,70,255]
delete(parts [0]);
for(var i = 1; i <= 3; ++ i){
parts [i] = parseInt(parts [i])。toString(16);
if(parts [i] .length == 1)parts [i] ='0'+ parts [i];
}
var hexString ='#'+ parts.join('')。toUpperCase() ; //#0070FF
回复下面评论中的问题:
我试图修改正则表达式来处理rgb和rgba,具体取决于我得到的是哪一个提示?谢谢。
我不确定在这个问题的上下文中是否有意义(因为你不能在十六进制中表示rgba颜色),但我猜想可能是其他用途。无论如何,你可以改变正则表达式是这样的:
/ ^ rgba?\((\\ \ s *(\ d +),\ s *(\ d +)(?:,\ s *(0\\\\d +))?\)$ /
输出示例:
var d = document.createElement('div');
d.style.backgroundColor ='rgba(255,60,50,0)';
/ ^ rgba?\((\ d +),\ s *(\ d +),\ s *(\ d +)(?:,\ s *(1 ?| 0\.\d +))\)$ / EXEC(d.style.backgroundColor);
// [rgba(255,60,50,0.33),255,60,50,0.33]
I'm kind of new to JavaScript and jQuery and now I'm facing a problem:
I need to post some data to PHP and one bit of the data needs to be the background color hex of div X.
jQuery has the css("background-color") function and with it I can get RGB value of the background into a JavaScript variable.
The CSS function seems to return a string like this rgb(0, 70, 255).
I couldn't find any way to get hex of the background-color (even though it's set as hex in CSS).
So it seems like I need to convert it. I found a function for converting RGB to hex, but it needs to be called with three different variables, r, g and b. So I would need to parse the string rgb(x,xx,xxx) into var r=x; var g=xx; var b=xxx; somehow.
I tried to google parsing strings with JavaScript, but I didn't really understand the regular expressions thing.
Is there a way to get the background-color of div as hex, or can the string be converted into 3 different variables?
try this out:
var rgbString = "rgb(0, 70, 255)"; // get this in whatever way.
var parts = rgbString.match(/^rgb\((\d+),\s*(\d+),\s*(\d+)\)$/);
// parts now should be ["rgb(0, 70, 255", "0", "70", "255"]
delete (parts[0]);
for (var i = 1; i <= 3; ++i) {
parts[i] = parseInt(parts[i]).toString(16);
if (parts[i].length == 1) parts[i] = '0' + parts[i];
}
var hexString ='#'+parts.join('').toUpperCase(); // "#0070FF"
In response to the question in the comments below:
I'm trying to modify the regex to handle both rgb and rgba depending which one I get. Any hints? Thanks.
I'm not exactly sure if it makes sense in the context of this question (since you can't represent an rgba color in hex), but I guess there could be other uses. Anyway, you could change the regex to be like this:
/^rgba?\((\d+),\s*(\d+),\s*(\d+)(?:,\s*(0\.\d+))?\)$/
Example output:
var d = document.createElement('div');
d.style.backgroundColor = 'rgba( 255, 60, 50, 0)';
/^rgba?\((\d+),\s*(\d+),\s*(\d+)(?:,\s*(1|0\.\d+))?\)$/.exec(d.style.backgroundColor);
// ["rgba(255, 60, 50, 0.33)", "255", "60", "50", "0.33"]
这篇关于JavaScript变量的背景颜色十六进制的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!