Can I force jQuery.css("backgroundColor") returns on hexadecimal format?

I have an element like this:

<p>My text with a <strong class="highlighted">sample highlight</strong>.<p>

And the CSS class like this:

.highlighted {
    background: #f0ff05;
    font-weight: normal;
}

But when I use a jQuery like this:

$(".highlighted").css("backgroundColor");

It returns rgb(240, 255, 5). I could write some function to convert from rgb to hex, 开发者_运维知识库but I would like to know if there is some way to jQuery return the value already on hexadecimal format.

---

Colors are always returned as rgb (except IE6 which already returns in hex), then we cannot return in another format natively.

Like you said, you can write a function to convert hex to rgb. Here is a topic with several examples of how to write this function: How to get hex color value rather than RGB value?.

But you wonder if there is a way to directly return the jQuery already in hex: the answer is yes, this is possible using CSS Hooks since jQuery 1.4.3.

The code should be:

$.cssHooks.backgroundColor = {
    get: function(elem) {
        if (elem.currentStyle)
            var bg = elem.currentStyle["backgroundColor"];
        else if (window.getComputedStyle)
            var bg = document.defaultView.getComputedStyle(elem,
                null).getPropertyValue("background-color");
        if (bg.search("rgb") == -1)
            return bg;
        else {
            bg = bg.match(/^rgb\((\d+),\s*(\d+),\s*(\d+)\)$/);
            function hex(x) {
                return ("0" + parseInt(x).toString(16)).slice(-2);
            }
            return "#" + hex(bg[1]) + hex(bg[2]) + hex(bg[3]);
        }
    }
}

And when you call $(".highlighted").css("backgroundColor"), the return will be #f0ff05. Here is a working sample to you see it working.

---

This is a slightly adjusted version of Erick Petrucelli's answer. It appears to handle RGBA.

$.cssHooks.backgroundColor = {
  get: function (elem) {
    if (elem.currentStyle) var bg = elem.currentStyle["backgroundColor"];
    else if (window.getComputedStyle)
      var bg = document.defaultView
        .getComputedStyle(elem, null)
        .getPropertyValue("background-color");
    if (bg.search("rgba") > -1) {
      return "#00ffffff";
    } else {
      if (bg.search("rgb") == -1) {
        return bg;
      } else {
        bg = bg.match(/^rgb\((\d+),\s*(\d+),\s*(\d+)\)$/);
        function hex(x) {
          return ("0" + parseInt(x).toString(16)).slice(-2);
        }
        return "#" + hex(bg[1]) + hex(bg[2]) + hex(bg[3]);
      }
    }
  },
};

---

function RGBAToHexA(test:string) {
let sep = test.toString().indexOf(",") > -1 ? "," : " ";
const rgba = test.toString().substring(5).split(")")[0].split(sep);
console.log(rgba)
let r = (+rgba[0]).toString(16),
  g = (+rgba[1]).toString(16),
  b = (+rgba[2]).toString(16),
  a = Math.round(+rgba[3] * 255).toString(16);

    if (r.length == 1)
        r = "0" + r;
    if (g.length == 1)
        g = "0" + g;
    if (b.length == 1)
        b = "0" + b;
    if (a.length == 1)
        a = "0" + a;

return "#" + r + g + b + a;}

This code works fine for me, I am using Jasmine protractor and I was getting rgb format when I tried to getcssValue of an element.

it('should check color  of login btn', async function(){
    browser.waitForAngularEnabled(true);
    browser.actions().mouseMove(element(by.css('.btn-auth, .btn-auth:hover'))).perform(); // mouse hover on button
    csspage.Loc_auth_btn.getCssValue('color').then(function(color){
        console.log(RGBAToHexA(color))
        expect( RGBAToHexA(color)).toContain(cssData.hoverauth.color);

    })
   // expect(csspage.Loc_auth_btn.getCssValue('color')).toContain(cssData.hoverauth.color);
})